77 results on '"Mn2O3"'
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2. Analyzing the synergistic effect of Mg on Mentha spicata L. mediated Mn2O3 nanoparticles for energy storage and bio-medical applications
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Sainta Jostar, T., Johnsy Arputhavalli, G., Palaniyandy, Nithyadharseni, Jebasingh, S., Alshahrani, Mohammad Y., Divya, G.S., and Muthu Vijayalakshmi, P.
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- 2025
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Catalog
3. NiS 2 /NiS/Mn 2 O 3 Nanofibers with Enhanced Oxygen Evolution Reaction Activity.
- Author
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Yang, Bin, Ding, Xinyao, Feng, Lifeng, and Zhang, Mingyi
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GREEN fuels , *OXYGEN evolution reactions , *HYDROGEN economy , *CATALYST testing , *ALKALINE solutions - Abstract
The development of efficient and cost-effective electrocatalysts is crucial for achieving a green hydrogen economy through electrocatalytic water splitting. Herein, we report an excellent catalyst, one-dimensional NiS2/NiS/Mn2O3 nanofibers prepared by electrospinning, which exhibits outstanding electrochemical performance in an alkaline solution. We explored effective strategies to construct one-dimensional nanostructures and composite oxides to promote the electrocatalytic performance of transition metal dichalcogenides. At a current density of 20 mA cm−2, it requires an overpotential of 333 mV for OER. Furthermore, NiS2/NiS/Mn2O3 nanofibers maintain good durability even after 1000 cycles. The long-term electrochemical stability test of the catalyst NiS2/NiS/Mn2O3 was implemented at 20 mA cm−2 for 12 h. The potential remained at 99.52%. Therefore, this study demonstrates that NiS2/NiS/Mn2O3 can serve as a viable green hydrogen production electrocatalyst. [ABSTRACT FROM AUTHOR] more...
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- 2024
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4. Structure modification and electrical properties by Mn2O3 dopant addition to SnO2 varistor system.
- Author
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Padilla-Zarate, E.A., Pech-Canul, M.I., Hernández, M.B., García-Ortiz, L., Toxqui-Terán, A., and Aguilar-Martínez, J.A.
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ELECTRIC displacement , *STANNIC oxide , *DOPING agents (Chemistry) , *CARBON dioxide , *ELECTRIC breakdown , *CHROMIUM - Abstract
This work aims to study the effect of Mn 2 O 3 additions on the electrical properties and microstructure characteristics of a SnO 2 -based ceramic varistor system doped additionally with Sb 2 O 5 , Cr 2 O 3 , and CoO. The specimens were prepared using conventional ceramic processing and homogenized by a high-energy ball milling system using the following composition: (98.99-X) % SnO 2 – 0.05% Cr 2 O 3 – 0.05% Sb 2 O 5 – 1.00% CoO – X% Mn 2 O 3 where X = 0.00, 0.05, 0.10, 0.20, 0.50 and 1% mol. Characterization by TG-DSC/DTA, XRD, XPS, and SEM/EDS, and the proposed chemical and defect-formation reactions allowed the conclusion that Mn 2 O 3 additions produce alterations of the microstructure consisting of the in situ formation of the spinel Co 2 MnO 4 secondary phase and modification of the potential barriers in the intergranular regions, where, in addition, oxygen vacancies are formed. With the 0.05 mol % Mn 2 O 3 , the grain size (average in the range of 2–3 μm) drops by 20 %, thus augmenting the grain boundaries. Altogether, this leads to a decrease in the nonlinearity coefficient (α) and an advantageous displacement of the breakdown electric field (E B). The 0.05 mol % Mn 2 O 3 specimen compares favorably with the reference material by surpassing the E B value by a factor of 8. Elucidation of Mn2+ and Co2+ in 1 mol % Mn 2 O 3 specimens by XPS suggests the role of MnO and CoO as intermediate phases, essential for Co 2 MnO 4 formation. The pathway for in situ formation of Co 2 MnO 4 is set forth based on the above characterization techniques in conjunction with proposed chemical and defect-formation reactions. [ABSTRACT FROM AUTHOR] more...
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- 2024
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5. The combined effect of ultrafine particles of cobalt and manganese oxides and Origanum vulgare herb extract on ruminal digestion in vitro
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Aina Maratovna Kamirova, Elena Anatolyevna Sizova, Daniil Evgenievich Shoshin, and Anastasia Pavlovna Ivanishcheva
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co3o4 ,digestibility ,luminescence ,mn2o3 ,origanum vulgare ,plants ,ultrafine particles ,Animal culture ,SF1-1100 ,Veterinary medicine ,SF600-1100 - Abstract
Background and Aim: At present, detailed studies are being conducted to confirm the safety of the use of metal-containing ultrafine particles (UFP) in animal feeding, preventing the possibility of negative effects on productive qualities and physiological state, as well as on the environment and final consumer, that is, humans. Thus, the purpose of this research was to study the safety of cobalt- and manganese-containing UFP (UFP Co3O4, Mn2O3 UFP) together with Origanum vulgare (PB) herb extract in a bioluminescence inhibition test, as well as the effect of this composition on ruminal digestion in vitro. Materials and Methods: The safety of the studied samples was determined using a multifunctional microplate analyzer TECAN Infinite F200 (Tecan Austria GmbH, Austria), recording the luminescence value of the bacterial strain Escherichia coli K12 TG11 (Ecolum, JSC NVO Immunotech, Russia). Dry matter (DM) digestibility studies were performed using the in vitro method on an “artificial rumen” model using an ANKOM Daisy II incubator unit (AD II; USA). The number of protozoa in ruminal fluid was counted in a Goryaev chamber. The bacterial mass was assessed by differential centrifugation followed by drying. This method is based on differences in the sedimentation rate of particles that differ in size and density. Results: UFP Co3O4 and Mn2O3 at concentrations above 1.5 × 10-5 and 1.9 × 10-3 mol/L, respectively, have a pronounced bactericidal effect, suppressing more than 50% of the luminescence of E. coli K12 TG1. The combined use of UFP metals and plant extract increases the luminescence of the test object, indicating its safety. The combined use of UFP and PB increases the digestibility of feed DM in vitro and the number of protozoa in 1 mL of ruminal fluid; however, the combination of UFP Mn2O3 + PB (13.8%) yielded the best result, which is recommended for further in vivo research. Conclusion: Origanum vulgare extract reduces the toxicity of UFP Co3O4 and Mn2O3 in vitro, indicating that their combined use is safer. more...
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- 2024
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6. Co掺杂Mn2O3复合材料的构筑及活化过氧单硫酸盐降解医药废水.
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张 涛, 张 贺, 杜雅欣, and 展思辉
- Abstract
Antibiotics in wastewater pose a major threat to human health and environmental safety, and the generation of reactive oxygen species by peroxomonosulfate (PMS) activation is an attractive option for the treatment of treating antibiotic wastewater. However, achieving efficient PMS activation remains challenging due to insufficient electron mobility efficiency. Herein, Co-doped Mn2O3 catalyst (Co5-Mn2O3) is prepared by a simple one-step calcination method, and the degradation performance of the Co5-Mn2O3/PMS system is investigated using ofloxacin (OFX) as the target pollutant, and the removal of OFX reaches 95% within 15 min, which is 12.3-fold enhancement compared with the pristine Mn2O3, and the degradation performance of the Co5-Mn2O3/PMS system shows excellent degradation performance for a variety of pollutants (ciprofloxacin, sulfamethoxazole, tetracycline, rhodamine B, and methyl orange), which demonstrates the potential for practical applications. It is confirmed by X-ray photoelectron spectroscopy that Co doping induces the surface reconstruction of the catalyst and electron migration to achieve the formation of Mn4+-O-Co2+ active sites. Trap experiments show that the electron-rich Co site and the electron-deficient Mn site could effectively activate PMS to generate sulfate radicals and singlet oxygen for the efficient removal of ofloxacin. This work provides a structural modulation method of the active site for controlling the catalytic function, which will provide a new perspective for the rational design of Fenton-like catalysts. [ABSTRACT FROM AUTHOR] more...
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- 2024
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7. Facile synthesis, structural, morphological and electronic investigation of Mn2O3 nano-rice shape and Mn2O3-rGO hybrid nanocomposite.
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Elhaes, Hanan, Abdel-Salam, Ahmed I., Gomaa, Islam, Ibrahim, Asmaa, Yahia, Ibrahim S., Zahran, Heba Y., Ezzat, Hend A., Zahran, Mohamed, Abdel-wahab, Mohamed Sh., Refaat, Ahmed, and Ibrahim, Medhat A. more...
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MANGANESE oxides , *NANOCOMPOSITE materials , *FIELD emission electron microscopy , *GRAPHENE oxide , *DENSITY functional theory , *DISLOCATION density - Abstract
The hydrothermal method was used to prepare manganese oxide (Mn2O3) nanoparticles. Reduced graphene oxide (rGO) powder was sonicated with Mn2O3 forming a homogeneous Mn2O3-rGO nanocomposite. The prepared nanocomposite was characterized by UV–Vis spectroscopy to unravel origin of absorption photons strongly in the visible region that ensues due to charge transfer, Fourier transform infrared (FTIR) result reveal that the catalytic role of Mn2O3 in graphene reduction in sono-nano composites formation, X-ray diffraction (XRD) result also stand out all of structural parameters enhance slight increase for the position non-ideality (δ dislocation density) of atoms in crystallite size (D) and micro strain (ε).Decreasing the average crystallite size 41.13 nm and 37.2 nm for Mn2O3 and Mn2O3-rGO respectively due to high (600 W) ultra-sonication in presence of rGO-sheets. Field emission scanning electron microscopy (FESEM) show up uniform distribution of Mn2O3 and tightly anchored on the surface of the rGO sheets. These different characterization techniques confirmed the formation of the nanocomposite. Molecular quantum mechanical calculations for interaction investigation mechanism between rGO and Mn2O3, were conducted. Two model molecules were built for Mn2O3 and functionalized rGO, and 8 possible interaction mechanisms between Mn2O3 and functionalized rGO were proposed. Density functional theory (DFT) calculations using B3LYP/LANL2DZ basis set were conducted for the studied model molecules. Electronic properties and reactivity were investigated by calculating molecular electrostatic potential (MESP) mapping for model structures. The most active and plausible structure is the interaction of rGO through the OH group at the terminal with Mn2O3 through the Mn atom. It can be concluded that Mn2O3 activates the rGO surface and increases its detection sensitivity and reactivity. [ABSTRACT FROM AUTHOR] more...
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- 2023
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8. Electrical Properties and Photosensitivity of n-Mn2O3/p-InSe Heterojunctions Produced by the Spray Pyrolysis Method.
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Orletskii, I. G., Tkachuk, I. G., Ivanov, V. I., Kovalyuk, Z. D., and Zaslonkin, A. V.
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SEMICONDUCTOR manufacturing ,SEMICONDUCTORS ,SEMICONDUCTOR thin films ,PHOTOSENSITIVITY ,POTENTIAL barrier - Abstract
The conditions of application of thin semiconductor Mn
2 O3 films on p-InSe crystalline layered semiconductor substrates at a temperature of 623 K by the spray-pyrolysis method to create anisotypic heterojunctions n-Mn2 O3 /p-InSe were investigated. InSe is a promising material for photoelectronics. The use of the Mn2 O3 film, which is transparent in the region of maximum photosensitivity of InSe, makes it possible to effectively exploit the optical properties of InSe in the fabrication of various semiconductor devices. The advantage of using layered semiconductors in the production of heterojunctions is that high-quality interfaces are obtained even with a significant discrepancy in the parameters of the crystal lattices of the starting materials. This significantly expands the choice of heterojunction materials. Electrical and photoelectric parameters of n-Mn2 O3 /p-InSe heterojunctions were measured and theoretical models describing them were proposed. The graphical dependencies of I-V characteristics, series resistance, height of the potential barrier and photosensitivity are constructed. It was established that these heterojunctions are photosensitive and have rectifying properties. Using the energy parameters of the starting materials, an energy diagram of the heterojunction was constructed, which allows for the analysis of physical processes in the obtained heterojunctions. Based on the temperature dependence of both direct and reverse I-V characteristics, the dynamics of changes in the energy parameters of the heterojunction with temperature, as well as the mechanisms of current flow through the heterojunction, are established. The spectral photosensitivity of the heterojunction was analyzed. [ABSTRACT FROM AUTHOR] more...- Published
- 2023
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9. Mn-MOFs-derived Mn2O3 as an effective peroxymonosulfate activator for the degradation of organics in water.
- Author
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Thao, V. D., Dung, N. T., Duc, N. D., Trang, T. T., Thanh, D. T. M., Phuong, N. T., Thuy, N. T., Lin, K.-Y. A., and Huy, N. N.
- Abstract
In this work, Mn
2 O3 synthesized from Mn-MIL-100 was used as an efficient PMS activator for Rhodamine B (RhB) removal in water. The materials were characterized by XRD, FITR, SEM, EDX, and BET analyses. Results showed that the prepared Mn2 O3 had better PMS activation efficiency than Mn2+ , Mn3 O4 , MnO2 , and commercial Mn2 O3 . In RhB removal, the highest RhB degradation and COD removal efficiencies reached 98.2% and 72.15%, respectively, after 70 min at the conditions of 10 mgRhB/L, 500 mgPMS/L, 400 mgMn2 O3 /L, pH 7, and 30 °C. Radical quenching tests showed that the sulfate radicals played a major role in the degradation of RhB. The decomposition of RhB followed pseudo-first-order kinetics (R2 > 0.99) with an activation energy of 34.94 kJ/mol. The effect of anion on RhB decomposition was in the order of SO4 2− < NO3 − < Cl− 3 more...− 4 2− 3 2− . RhB degradation efficiency remained at 86.74% after 5 cycles of reuse. These results suggest a potential application of PMS activation by Mn2 O3 in the treatment of non—or hard-biodegradable wastewater. [ABSTRACT FROM AUTHOR]- Published
- 2023
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10. Enhanced pursuance of dye-sensitized solar cell for indoor and outdoor stability using reduced graphene oxide @ Mn2O3 nanocomposite
- Author
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Arjun Kumar, B., Ramalingam, G., Al Omari, Salah Addin Burhan, Nallabala, Nanda Kumar Reddy, Sakthivel, P., Kabeer, Saifudeen, and Sangaraju, Sambasivam
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- 2024
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11. Synthesis and characterization of high surface area mesoporous manganese oxides nanofibers prepared by electrospinning technique.
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EL-Rafei, Amira M.
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MANGANESE oxides , *SURFACE analysis , *SURFACE area , *NANOFIBERS , *ELECTROSPINNING , *MESOPOROUS materials - Abstract
The electrospinning technique is used to synthesize several types of mesoporous manganese oxides, namely Mn2O3, Mn3O4, and hybrid manganese oxides. The as-spun nanofibers are heated at different temperatures from 500 to 1000 °C for 2 h. XRD analysis reveals that the Mn2O3 phase starts to form at 500 °C, whereas at 900 °C, Mn2O3 and Mn3O4 are co-existent and at 1000 °C, Mn3O4 is the sole phase. The mesoporous material's behavior can be seen in all isotherms of the prepared manganese oxide nanofibers. The maximum surface area of 1306.98 m2/g is achieved for the sample calcined at 500 °C, which is one of the highest surface areas recorded for Mn2O3 as compared with the literature. [ABSTRACT FROM AUTHOR] more...
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- 2023
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12. 不同元素掺杂锰基催化剂的NH3-SCR反应性能研究.
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谭仁俊, 罗仕忠, 王 涛, 杜沛佞, and 敬方梨
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ALKALINE earth metals ,MANGANESE catalysts ,TRANSITION metals ,MANGANESE oxides ,CATALYST testing ,SILICON ,TRANSITION metal oxides - Abstract
Copyright of Inorganic Chemicals Industry is the property of Editorial Office of Inorganic Chemicals Industry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
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- 2023
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13. The Efficacy of Manganese Oxide (Mn2O3) Nanoparticles and Tellurium Oxide (TeO2) Nanorods Against Leishmania Lesions in Female Albino Rats.
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Adil, Mohaned, Al-Khalidi, Ayadh, Hamad, Atheer Khdyair, Tariq, Hayder, Yahya, Hala Munir, and Mohammad Ali khalil, Noor Alhuda
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MANGANESE oxides , *NANOPARTICLES , *LEISHMANIASIS , *SKIN ulcers , *LABORATORY rats - Abstract
Leishmaniasis is a group of diseases caused by infection with Leishmania parasites. The lesions that develop as a result of leishmaniasis can vary depending on the species of the parasite and the type of leishmaniasis. Cutaneous leishmaniasis is the most common form of the disease and it results in skin sores or ulcers. Materials with manganese oxide (Mn2O3) nanoparticles and tellurium oxide (TeO2) nanorods have been shown to have antibacterial, antifungal, and antiparasitic effects. The purpose of this study was to ascertain how Mn2O3 and TeO2 nanoparticles affected Leishmania major-caused wound healing in rats. The albino rats were separated into four groups of five once a lesion appeared on their tails. In the two treatment groups, Mn2O3 and TeO2 nanoparticles were injected every day, once a day, intra-wound in three places, and in the meglumine antimoniate group, the drug was injected intramuscularly for five weeks. The albino rats in the negative control group did not receive any medication. The size of the wounds in the group treated with Mn2O3 nanoparticles did not differ significantly from the control group that did not receive treatment, however the diameter of the wounds in the group treated with TeO2 nanorods did change significantly from the control group that did not receive treatment. It was, however, larger than the group that received meglumine antimoniate treatment. TeO2 nanorods, as opposed to Mn2O3 nanoparticles, had an in vivo anti-Leishmanial potential. [ABSTRACT FROM AUTHOR] more...
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- 2023
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14. Constructing three‐dimensional Mn2O3 catalysts with various morphologies for catalytic oxidation of benzene.
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Zhang, Jinhui, Zhang, Hanyue, Zhu, Xinfeng, Liu, Hongpan, Hou, Guangchao, Kang, Haiyan, Liu, Biao, Zhu, Wenwen, Yin, Shiqiang, and Song, Zongxian
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CATALYTIC oxidation , *BENZENE , *CATALYSTS , *CATALYTIC activity , *MORPHOLOGY , *OXIDATION , *HYDROTHERMAL synthesis - Abstract
Three kinds of three‐dimensional (3D) Mn2O3 catalysts with different morphologies (cube, fan‐like structure, and sphere) and various exposed crystal planes were prepared by a hydrothermal method for benzene oxidation. The activity results suggested that sample Mn2O3‐Cl with hierarchical cube morphology exhibited a better rate of benzene degradation than the other samples. Mn2O3‐Cl exhibited the lowest complete benzene conversion temperature (T90 = 252°C), which was ~48°C lower than that of the Mn2O3‐S sample. Meanwhile, the Rm and Rs values of Mn2O3‐Cl were 2.71 and 3.21 times, respectively, higher than those of Mn2O3‐S. TEM results suggested that morphology has a significant effect on crystal planes. The activity–morphology relationship over the Mn2O3 samples was investigated by multiple analytical techniques. It can be concluded that the low crystallinity, superior redox ability, abundant low‐valence Mn ions, and Olatt species in the Mn2O3‐Cl catalyst were responsible for its superior catalytic activity. [ABSTRACT FROM AUTHOR] more...
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- 2023
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15. Innovative strategies to Counteract Jahn-Teller effect in manganese oxide for enhanced zinc-ion battery performance.
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Shu, Zhiwei, Shao, Fuqiang, Bian, Yuhong, Liu, Zhejun, Shan, Sunpeng, Jiao, Yang, Chen, Jianrong, and Xu, Yanchao
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JAHN-Teller effect , *MANGANESE oxides , *STRUCTURAL stability , *ENERGY density , *DOPING agents (Chemistry) - Abstract
Due to its high energy density, non-toxic, economical and efficient, manganese oxide stands out as a promising cathode material for employment in aqueous zinc-ion batteries. However, the Jahn-Teller effect of Mn3+ and manganese dissolution impose limitations on the widespread application of aqueous zinc-ion batteries during charging and discharging. Herein, the Co doped Mn 2 O 3 electrode material is introduced. Co atoms in the low valence state replace Mn in the manganese oxide lattice, which effectively regulates the layer spacing of Mn 2 O 3. This modulation maintains the structural stability of the electrode during cycling, prevents structural collapse, and inhibits manganese dissolution and the Jahn-Teller effect. Additionally, Co doping increased oxygen vacancies and improved the conductivity of zinc-ion batteries. The Co-Mn 2 O 3 electrode exhibits a high specific capacity of 478 mAh·g−1 at 0.1 A g−1 current density, with 93 % capacity retention 1000 cycles at 1 A g−1 current density. This study delves into the role of Co doping in suppressing the Jahn-Teller effect, offering new insights for improving manganese oxide as an anode material for zinc-ion batteries. This study introduces a high-capacity Co-doped Mn₂O₃ electrode material. Cobalt atoms replace manganese in the Mn₂O₃ lattice, effectively regulating layer spacing and maintaining structural stability during cycling. Meanwhile, the introduction of cobalt prevents structural collapse, inhibits manganese dissolution, and suppresses the Jahn-Teller effect. Additionally, Co doping increases oxygen vacancies and improves conductivity. [Display omitted] • Co doping in Mn₂O₃ regulates layer spacing, maintaining structural integrity. • Co suppresses Jahn-Teller distortion of Mn³⁺ and prevents Mn dissolution. • Co doping increases oxygen vacancies, boosting electrode conductivity. [ABSTRACT FROM AUTHOR] more...
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- 2025
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16. Increasing Lewis acidic sites and promoting electron transfer of Mn2O3 by C-hybridization to improve the peroxymonosulfate activation for Bisphenol A degradation.
- Author
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Zhang, Xinglong, Zhao, Qia, He, Huanhuan, Zhang, Caiyan, Zhao, Lele, and Li, Baoning
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MANGANESE catalysts , *ELECTRON paramagnetic resonance , *ORBITAL hybridization , *PRECIPITATION (Chemistry) , *CHARGE exchange - Abstract
The surface acidity and electron transfer performance of manganese oxide catalysts significantly affected its performance of peroxymonosulfate (PMS) activation. In this work, Mn 2 O 3 catalyst was prepared by the precipitation method. The C-hybridization Mn 2 O 3 (Mn 2 O 3 -D) catalyst prepared with disodium oxalate as a precipitant had more Mn3+ and Lewis acid sites on the surface, promoting the binding of PMS on the catalyst surface, which exhibited the best performance in inducing PMS activation to degrade bisphenol A (BPA). Quenching experiments and in situ electron spin resonance (ESR) results indicated that radicals and singlet oxygen were not the main reactive oxygen species (ROSs) in the advanced oxidation process. The chemical probe experiment of phenylmethylsulfone (PMSO) showed that the ≡ Mn-OOSO 3 - metastable intermediate formed by the binding of PMS with Mn sites on the catalyst surface was important active species for contaminants degradation. Contaminants combined with intermediates on the catalyst surface to form the electron transfer channels, which were directly degraded through oxygen-atom-transfer pathway and single-electron-transfer pathway. And the hybridization of C promoted the electron transfer during this process. This work further elucidated the reaction mechanism of PMS activation by manganese oxides, and proposed new ideas for the design of MnO x catalysts for efficient activation of PMS. [Display omitted] • C-hybridization Mn 2 O 3 is synthesized by using sodium oxalate as a precipitant. • More Mn3+ and Lewis acid sites lead better catalytic activity. • Radicals and 1O 2 are not the main causes of contaminants degradation. • ≡Mn-OOSO 3 - directly degrades contaminants through mediated electron-transfer. [ABSTRACT FROM AUTHOR] more...
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- 2025
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17. Electrochemical assessment of tailored Mn2O3 cuboidal hierarchical particles prepared using urea and Piperazine.
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Dhakal, Alisha, Perez, Felio A, and Mishra, Sanjay R
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ELECTROCHEMICAL analysis , *SCANNING electron microscopy , *HYDROTHERMAL synthesis , *POTENTIAL energy , *ENERGY storage , *SUPERCAPACITOR electrodes , *SUPERCAPACITORS - Abstract
This study synthesizes cuboidal-shaped hierarchical Mn 2 O 3 (MNO) particles using a simple hydrothermal technique with Good's buffer piperazine and examines their electrochemical performance. The research explores how varying piperazine concentrations (piperazine concentration x in MNO- x) affect the structure and electrochemical properties of the MNO particles. X-ray diffraction (XRD) confirms the crystalline nature of MNO while scanning electron microscopy reveals that piperazine concentration influences the particles' shape, size, and morphology. The MNO synthesized with 6 mmole piperazine (MNO-6) has the highest surface area of 8.67 m²/g. Electrochemical tests in 1 M and 6 M KOH electrolytes show that MNO-6 achieves the highest specific capacitance, with 440 F/g in 1 M and 952 F/g in 6 M KOH at a 1 mV/s scan rate. At a 1 A g-1 current density, MNO-6 exhibits a specific capacitance of ∼545.8 F/g in 1 M KOH and 809.0 F/g in 6 M KOH, with corresponding energy densities of 27.3 Wh/kg and 40.4 Wh/kg, and power densities of 315.7 W/kg and 365 W/kg, respectively. The superior electrochemical performance is attributed to the high surface area and porous structure of MNO synthesized with piperazine, highlighting its potential for advanced energy storage applications. [Display omitted] [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
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18. Coupling of Mn 2 O 3 with Heteroatom-Doped Reduced Graphene Oxide Aerogels with Improved Electrochemical Performances for Sodium-Ion Batteries.
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Mahamad Yusoff, Nor Fazila, Idris, Nurul Hayati, Md Din, Muhamad Faiz, Majid, Siti Rohana, Harun, Noor Aniza, and Noerochim, Lukman
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AEROGELS , *GRAPHENE oxide , *SODIUM ions , *ION channels , *TRANSITION metal oxides - Abstract
Currently, efforts to address the energy needs of large-scale power applications have expedited the development of sodium–ion (Na–ion) batteries. Transition-metal oxides, including Mn2O3, are promising for low-cost, eco-friendly energy storage/conversion. Due to its high theoretical capacity, Mn2O3 is worth exploring as an anode material for Na-ion batteries; however, its actual application is constrained by low electrical conductivity and capacity fading. Herein, we attempt to overcome the problems related to Mn2O3 with heteroatom-doped reduced graphene oxide (rGO) aerogels synthesised via the hydrothermal method with a subsequent freeze-drying process. The cubic Mn2O3 particles with an average size of 0.5–1.5 µm are distributed to both sides of heteroatom-doped rGO aerogels layers. Results indicate that heteroatom-doped rGO aerogels may serve as an efficient ion transport channel for electrolyte ion transport in Mn2O3. After 100 cycles, the electrodes retained their capacities of 242, 325, and 277 mAh g−1, for Mn2O3/rGO, Mn2O3/nitrogen-rGO, and Mn2O3/nitrogen, sulphur-rGO aerogels, respectively. Doping Mn2O3 with heteroatom-doped rGO aerogels increased its electrical conductivity and buffered volume change during charge/discharge, resulting in high capacity and stable cycling performance. The synergistic effects of heteroatom doping and the three-dimensional porous structure network of rGO aerogels are responsible for their excellent electrochemical performances. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
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19. Supported Mn2O3-based catalysts for NO-SCO: an experimental study.
- Author
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Qiang, Jialin, Li, Hui, Hui, Shien, and Wang, Denghui
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SELECTIVE catalytic oxidation ,CATALYSTS ,CATALYSIS ,CATALYTIC activity ,CHEMICAL properties - Abstract
In this paper, the NO-SCO (the selective catalytic oxidation of NO) experiments of single-phase Mn
2 O3 , supported Mn2 O3 /Al2 O3 , and the Ce-doped Mnx Cey /Al catalyst system were carried out. The physical and chemical properties of the catalysts were analyzed by XRD, BET, XPS, SEM, O2 -TPD, and H2 -TPR. The effects of loading and Ce doping on catalyst activity were studied. The results show that the Mn2 O3 catalyst exhibited the best activity at 300 ℃, and the NO conversion rate of Mn2 O3 was 78.2%. The relative content of Oα adsorbed on the surface of the Mnx /Al catalyst decreased obviously by loading Mn2 O3 on γ-Al2 O3 , which led to the decrease in catalyst activity. And the temperature window moved to the high-temperature region. After doping Ce, the dispersion of Mn enhanced, and the relative content of oxygen Oα adsorbed on the surface increased. The low-temperature activity and fluidity of oxygen in catalysts were improved. Among them, the Mn0.2 Ce0.08 /Al catalyst obtained a high specific surface area, good pore structure, large oxygen storage capacity, and excellent surface oxygen species. The corresponding NO conversion rate reached 83.5% at 290 ℃. Then, the effects of operating parameters such as space velocity, NO concentration, and O2 content on the catalytic activity of Mn0.2 Ce0.08 /Al were discussed. The experimental results show that the NO conversion rate of Mn0.2 Ce0.08 /Al decreased with increasing NO concentration and space velocity. The O2 content had a positive effect on the catalytic activity of the catalyst. However, the NO conversion rate tended to be stable due to the saturation of oxygen adsorbed on the catalyst. Through cycling experiments, we found that Mn2 O3 , Mn0.2 /Al, and Mn0.2 Ce0.08 /Al catalysts showed good oxidation stabilities for NO oxidation. The evaluation of the water and sulfur resistance of the catalyst shows that the toxicity of SO2 was reduced by the aqueous atmosphere to a certain extent. Through the structural optimization of the basic model and the calculation of the NO-SCO reaction path, the results show that the NO-SCO reaction on the Mn2 O3 (110) face followed the ER mechanism more. For the Mn2 O3 /Al2 O3 (110) surface, the LH-MvK hybrid mechanism can greatly reduce the desorption energy barrier of the reaction intermediates, which is more favorable for the NO-SCO reaction. The catalytic mechanisms of the Mnx Cey /Al catalysts require further in-depth research. [ABSTRACT FROM AUTHOR] more...- Published
- 2023
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20. Synthesis of Mn2O3@Mn(Bi)OCl Composite and Its Supercapacitive Behavior.
- Author
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Song, Y. Z., Li, M. T., Qi, B. X., and Xie, J. M.
- Abstract
Mn
2 O3 @Mn(Bi)OCl composite for supercapacitor were successfully synthesized via a facile solid-phase method using Bi(NO3 )t>3 and MnCl 2 with molar ratio of 2 : 1 as precursors. The Mn2 O3 @Mn(Bi)OCl composite were characterized by X-ray diffraction, scanning electron microscopy, thermogravimetry and differential scanning calorimetry and Brunauer–Emmett–Teller surface area measurements, respectively. Cyclic voltammetry and galvanostatic charge/discharge technique were performed for the Mn2 O3 @Mn(Bi)OCl mix-crystals in 1 M Na2 SO4 aqueous solutions; the specific capacitance of Mn2 O3 @Mn(Bi)OCl was about 203 F g‒1 at the current density of 1 A g–1 with a long life time, owing to the high power density and the large surface area, good conductivity, and high stability of the of Mn2 O3 @Mn(Bi)OCl composite. [ABSTRACT FROM AUTHOR] more...- Published
- 2022
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21. Mn-MOFs-derived Mn2O3 as an effective peroxymonosulfate activator for the degradation of organics in water
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Thao, V. D., Dung, N. T., Duc, N. D., Trang, T. T., Thanh, D. T. M., Phuong, N. T., Thuy, N. T., Lin, K.-Y. A., and Huy, N. N.
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- 2023
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22. Nanoparticles constructed mesoporous coral-like Mn2O3 as high performance anode for lithium-ion batteries.
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Hou, Junming, Li, Jingzhu, Guo, Yuping, Xu, Yanping, Zhang, Yarong, Fang, Zixuan, Yang, Jian, and Wu, Mengqiang
- Subjects
- *
LITHIUM-ion batteries , *CONSTRUCTION materials , *NANOPARTICLES , *CARBONIZATION , *ELECTRODES - Abstract
As well established, the morphology and architecture of electrode materials greatly contribute to the electrochemical properties. Herein, a novel structure of mesoporous coral-like manganese (III) oxide (Mn 2 O 3) is synthesized via a facile solvothermal method coupled with the carbonization under air. When fabricated as anode electrode for lithium-ion batteries (LIBs), the as-prepared Mn 2 O 3 exhibits good electrochemical properties, showing a high discharge capacity of 1090.4 mAh g−1 at 0.1 A g−1, and excellent rate performance of 410.4 mAh g−1 at 2 A g−1. Furthermore, it maintains the reversible discharge capacity of 1045 mAh g−1 at 0.1 A g−1 after 380 cycles, and 755 mAh g−1 at 1 A g−1 after 450 cycles. The durable cycling stability and outstanding rate performance can be attributed to its unique 3D mesoporous structure, which is favorable for increasing active area and shortening Li+ diffusion distance. [ABSTRACT FROM AUTHOR] more...
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- 2022
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23. Selective Catalytic Reduction of NOx with NH3 over Mn2O3 Supported with Different Morphology of CeO2 Catalysts.
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Sunder Rao, Shyam, Kumar Patel, Vivek, and Sharma, Sweta
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CATALYTIC reduction , *X-ray photoelectron spectroscopy , *CATALYSTS , *TRANSMISSION electron microscopy , *X-ray spectroscopy , *SCANNING electron microscopy - Abstract
Three different morphologies of CeO2 supports (nanoparticle, nanocube, and nanorod) were prepared by hydrothermal technique and further Mn2O3 metal was impregnated on CeO2 supports using wet‐impregnation methods, and their activity for NO reduction using NH3−SCR technique was analysed. The synthesized catalysts and supports were further characterized through scanning electron microscopy (SEM), Energy‐dispersive X‐ray spectroscopy (EDX), X‐ray diffraction (XRD), X‐ray Photoelectron Spectroscopy (XPS), and transmission electron microscopy (TEM), and Brunauer‐Emmett‐Teller (BET). The catalytic performance of Mn2O3/CeO2‐nanoparticle has shown the highest conversion (76 %) compared to the other two catalysts in the temperature range of 50–450 °C. [ABSTRACT FROM AUTHOR] more...
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- 2022
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24. Impact of gas composition (CO, H2, and HCl) on chemical looping combustion by SiO2 supported oxygen carriers.
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Narindri Rara Winayu, Birgitta, Shen, Bai-Chun, and Chu, Hsin
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CHEMICAL-looping combustion , *FERRIC oxide , *CARBON dioxide , *POROSITY - Abstract
A great oxygen carrier for chemical looping combustion (CLC) supports the carbon capture activity. In this study, Fe 2 O 3 , NiO, and Mn 2 O 3 are prepared on SiO 2 support for test in CLC under various operating conditions. The best utilization value of 100 % was performed by 20%Fe 2 O 3 /SiO 2 and stability was presented up to 10 redox cycles. 20%Fe 2 O 3 /SiO 2 was used for the following study with the presence of HCl. Combination of HCl and CO in the inlet gas had insignificant changes. Differently, a drastic improvement achieved by combination with H 2. However, the presence of HCl in multiple cycles test led to pore enlargement, surface area reduction, and decline in performance of 20%Fe 2 O 3 /SiO 2. The presence of H 2 O and CO 2 from the exhausted gas after the reaction indicated the efficient and complete reaction of the 20 % Fe 2 O 3 /SiO 2. Besides, analysis of the reaction kinetics with Type I deactivation mode performed a well fitted result. [Display omitted] • 20 % Fe 2 O 3 /SiO 2 reached 100 % conversion of CO and H 2. • 20 % Fe 2 O 3 /SiO 2 presented high stability in cycle test. • HCl addition promoted the performance of 20 % Fe 2 O 3 /SiO 2 under H 2 atmosphere. • Multiple cycle under mixed reducing atmosphere and HCl transformed the pore structure. • Type I deactivation kinetics model presented a well fitted data. [ABSTRACT FROM AUTHOR] more...
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- 2024
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25. Enhanced PMS activation by Mn2O3-loaded h-BN for levofloxacin removal: Unveiling the dominant influence of non-free radical pathway and N-Mn-mediated promotion of stable, long-lived Mn(IV) species.
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Zhao, Qingzi, Wu, Yizhou, Zhang, Xinxi, Zhou, Liang, Lu, Sitong, Zhang, Jinlong, Liu, Yongdi, and Lei, Juying
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NITROGEN compounds , *BORON nitride , *REACTIVE oxygen species , *CHARGE exchange , *POLYVINYLIDENE fluoride - Abstract
[Display omitted] • h-BN-Mn was successfully synthesized by a facile one-step method. • Free radicals and 1O 2 generated from the redox process of manganese. • Mn(IV) species and electron transfer supplemented to promote degradation. • Mn-N mediated the promotion of stable, long-lived Mn(IV) species. • h-BN-Mn-loaded membranes were capable of managing an expanded water system. The Mn 2 O 3 -loaded hexagonal boron nitride (h-BN-Mn) catalyst for peroxymonosulfate (PMS) activation was successfully synthesized using a one-step calcination process. The h-BN-Mn/PMS system achieved an impressive 97 % levofloxacin removal within a mere 90-minute timeframe. This catalyst, h-BN-Mn, effectively addresses the challenge of elevated manganese leaching rates and exhibits a broad pH degradation spectrum spanning from 3 to 11. Notably, it maintained robust degradation performance over five cycles, showcasing the potential for large-capacity water treatment when integrated with a polyvinylidene fluoride (PVDF) membrane (h-BN-Mn@PVDF), resulting in an 83.8 % removal rate over 6 h. In-depth analysis revealed three distinct degradation pathways. Primarily, the generation of reactive oxygen species (ROS), including singlet oxygen (1O 2), played a pivotal role. This was complemented by direct electron transfer from the contaminant to the catalyst-PMS complex, augmented by contributions from Mn(IV) species derived from the complex. This study not only presents a compelling instance of antibiotic degradation through multi-pathway activated PMS but also sheds light on the remarkable synergistic effects achieved by combining manganese oxide with boron and nitrogen compounds. [ABSTRACT FROM AUTHOR] more...
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- 2024
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26. Supported Mn2O3-based catalysts for NO-SCO: an experimental study
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Qiang, Jialin, Li, Hui, Hui, Shien, and Wang, Denghui
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- 2023
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27. Synthesis of Mn2O3@Mn(Bi)OCl Composite and Its Supercapacitive Behavior
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Song, Y. Z., Li, M. T., Qi, B. X., and Xie, J. M.
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- 2022
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28. Synthesis and Characterization of Mn₂O₃ and Its Electrochemical Properties in Relation to Dopamine.
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Suresh S, Celshia S, Selvamani M, Suresh V, and Hussein MA
- Abstract
Introduction Manganese(III) oxide (Mn
2 O3 ) is a transition metal oxide that has gained significant attention due to its unique properties and potential applications in various fields, including catalysis, energy storage, and sensing. Dopamine, a neurotransmitter in the human brain, plays a crucial role in regulating several physiological processes as its detection is important in areas such as medical diagnostics and neurochemistry. The synthesis of Mn2 O3 can be achieved through methods like precipitation, hydrothermal synthesis, or solid-state reactions. Aims The objective of this study is to synthesize Mn2 O3 , characterize its structure and morphology, and investigate its electrochemical properties toward dopamine. Materials and methods Materials used included manganese sulfate (MnSO4 ), potassium permanganate, deionized water, a Teflon steel autoclave, and a hot air oven. For the synthesis of a hierarchical Mn2 O3 rodlike shape, MnSO4 •H2 O (8 mmol) and potassium permanganate (8 mmol) were firstly dissolved in deionized water (40 mL) by stirring, which was then transferred to a Teflon-lined stainless steel autoclave (50 mL). This autoclave was sealed and maintained at 90℃ for six hours. Finally, the resultant Mn2 O3 rods were collected by filtration, washed with distilled water and absolute ethanol for several times, and dried in air at 80℃. Mn2 O3 rods were obtained by the calcinations of the as-prepared Mn2 O3 rods at different temperatures. When Mn2 O3 rods were treated at 600℃ for six hours in air, Mn2 O3 rods could be collected. Results The X-ray diffraction (XRD) analysis shows that Mn2 O3 is crystalline in structure and it matched with that of the Joint Committee on Powder Diffraction Standards (JCPDS). The field emission scanning electron microscopy (FE-SEM) shows the morphology of Mn2 O3 is a particle with the size of 100 nm. Cyclic voltammetry response shows that compared to bare electrode, modified electrode shows the higher current response which indicates the sensing ability of the dopamine molecule. Conclusion Mn₂O₃ was prepared using a hydrothermal technique, and the formation of nanoparticles (NPs) was verified through XRD, while the morphology was examined using FE-SEM. The Mn2 O3 obtained was utilized in the detection of electrochemical dopamine, showing promise in the development of effective dopamine sensors. This study sets the stage for the integration of Mn₂O₃ into microfluidic systems for ongoing dopamine monitoring, presenting novel prospects for healthcare and neurochemical investigations. The exploration of various surface engineering approaches may additionally improve the electrochemical capabilities of Mn₂O₃ for the advancement of sensor technology., Competing Interests: Human subjects: All authors have confirmed that this study did not involve human participants or tissue. Animal subjects: All authors have confirmed that this study did not involve animal subjects or tissue. Conflicts of interest: In compliance with the ICMJE uniform disclosure form, all authors declare the following: Payment/services info: All authors have declared that no financial support was received from any organization for the submitted work. Financial relationships: All authors have declared that they have no financial relationships at present or within the previous three years with any organizations that might have an interest in the submitted work. Other relationships: All authors have declared that there are no other relationships or activities that could appear to have influenced the submitted work., (Copyright © 2024, Suresh et al.) more...- Published
- 2024
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29. Carbon dot modified Mn2O3 porous spheres as cathode materials for high performance zinc ion batteries.
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Luo, Shao-hua, Meng, Xue, Cai, Kexing, Chen, Hu, Qian, Lixiong, Guo, Jing, Yan, Sheng-xue, Wang, Qing, Ji, Xianbing, and Zhou, Xiuyan
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ZINC ions , *MICROSPHERES , *CATHODES , *SCANNING electron microscopes , *MANGANESE oxides , *SPHERES , *GLOW discharges - Abstract
Manganese oxide is a promising material due to its low cost, abundant reserves, and environmental friendliness. However, low cycling performance has been restricting the manganese oxide cathode materials on the road to commercialization. In this paper, Mn 2 O 3 microspheres with a porous structure are prepared by hydrothermal process and then compounded with low dimensional and small-scale carbon dots (CDs), and the obtained Mn 2 O 3 /CDs materials are used to assemble aqueous zinc ion batteries. X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM) are used to characterize its structure and morphology, which prove that the composite with CDs do not change the structure of the original material. The morphology of microspheres can increase the surface area of electrolyte-electrode interface, which is beneficial to ion embedding into cathode materials. Compared with pure Mn 2 O 3 , the composite with CDs content of 3% (MC3) has the best electrochemical performance (the discharge specific capacity is 252.7 mAh·g−1 at 0.1 A g−1). Moreover, the reversible capacity of the Mn 2 O 3 /CDs composites is improved due to the inhibition of the dissolution of Mn by the highly conductive CDs. The specific discharge capacity of the Mn 2 O 3 /CDs composites after 300 cycles is 102.8 mAh·g−1, which is 2.3 times higher than that of the pure Mn 2 O 3. • Mn 2 O 3 /CDs porous microspheres prepared by hydrothermal method improves cycling performance. • CDs improves the specific capacity and cycle life of Mn 2 O 3 cathode. • The reaction kinetics of high rate performance of Mn 2 O 3 /CDs is investigated. [ABSTRACT FROM AUTHOR] more...
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- 2024
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30. Optical and electrochemical properties of manganese oxide (Mn3O4) nanoparticles: Investigating the influence of calcination temperature on supercapacitor performance.
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Horti, N.C., Samage, Anita, Halakarni, Mahaveer A., Chavan, S.K., Inamdar, S.R., Kamatagi, M.D., and Nataraj, S.K.
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CALCINATION (Heat treatment) , *SUPERCAPACITOR performance , *CARBON-based materials , *MANGANESE oxides , *OPTICAL properties , *KENAF - Abstract
In this study, we investigate the influence of calcination temperature on the structural, optical, and electrochemical properties of Mn 3 O 4 nanoparticles synthesized through a chemical co-precipitation route. Field-Emission Scanning Electron Microscopy (FESEM) images depict the formation of highly agglomerated, spherical-shaped particles. At calcination temperatures of 700 °C and 900 °C, the observation reveals the emergence of flat pellets and rod-like structures. The X-ray Diffraction (XRD) patterns confirm the presence of the Mn 3 O 4 phase in M 0 and M 1 samples. However, the sample calcined at 500 °C (M 3) showed a mixed phase of Mn 3 O 4 and Mn 2 O 3. Upon further calcination at 700 and 900 °C, this mixed phase undergoes complete transformation into the Mn 2 O 3 phase. The change in absorption onset and photoluminescence intensity of samples is found with an increase in calcination temperature due to the crystal growth and phase modification. Furthermore, the synthesized samples are employed as electrode materials for supercapacitor applications. The sample calcined at 300 °C (M 1) in three-electrode system demonstrated the specific capacitance (C sp) of 273.3 F/g at 0.5 A/g in an alkaline medium. The asymmetric cell assembled by using M 1 and Hibiscus cannabinus stem-derived carbon material (HBC-900) delivered higher C sp of 205.7 F/g at 0.5 A/g. In addition, asymmetric supercapacitor device exhibited a high energy and power density of 43.1 Wh/kg and 476.2 W/kg with 82.07 % of initial C sp retention over 10,000 cycles at 10 A/g, which makes the sample M 1 as the potential electrode material for supercapacitor application. • Study gives optical & electrochemical properties of Mn 3 O 4 prepared via coprecipitation method. • Calcinated Mn 3 O 4 phase nanomaterials converted into a flat pellets and rod-like structures. • Further, mixed phase of Mn 3 O 4 and Mn 2 O 3 transformed into the Mn 2 O 3 phase. • Nan Mn 3 O 4 showed specific capacitance (C sp) of 273.3 F/g at 0.5 A/g in an alkaline medium. [ABSTRACT FROM AUTHOR] more...
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- 2024
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31. Green synthesis of Mn2O3 activated PDS to degrade estriol in medical wastewater and its degradation pathway.
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Lin, Mei, Liu, Ming, Wu, Jianwang, Owens, Gary, and Chen, Zuliang
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ESTRIOL , *SEWAGE , *LIQUID chromatography-mass spectrometry , *REACTIVE oxygen species , *DENSITY functional theory - Abstract
• Green Mn2O3 was used to active PDS for removing E3 from real wastewaters. • Effects of substrates of wastewaters on the removal of E3 by Mn 2 O 3 /PDS system. • Combined DFT, LC-MS analyses and ECOSAR to understand the reaction mechanisms. • The degradation pathway and toxicity of intermediates were predicted. While green synthesized Mn 2 O 3 has been used to activate peroxydisulfate (PDS) to degrade estrogens, effective application in real wastewater is less common due to variation in environmental matrices in wastewater. Here, green synthesized Mn 2 O 3 was used as a Fenton-like catalyst to activate PDS for estriol (E3) degradation in wastewater. The results show that the high concentration of K+ and humic acid in wastewater could inhibit the activation process of the Mn 2 O 3 /PDS system, resulting in low removal efficiency of E3 in wastewater. However, when the concentration of PDS was increased to 15 mM, the removal efficiency of E3 in medical wastewater can reach 100 %, because the high PDS concentration increases the main reactive oxygen species singlet oxygen (1O 2) in medical wastewater. XRD and SEM-EDS analysis indicate that the crystal structure of Mn 2 O 3 is stable, with a consistent rice grain-like morphology before and after reaction. XPS results show no obvious changes in the percentages of Mn(II), Mn(III) and Mn(IV) before and after reaction, indicating that Mn 2 O 3 has good stability when degrading E3 in medical wastewater. Based on density functional theory (DFT) calculations, liquid chromatography-mass spectrometry (LC-MS), and ecological structure–activity relationship (ECOSAR) modeling data analysis, the reactive oxygen species produced by the Mn 2 O 3 /PDS system mainly attack the benzene ring structure of E3, where the toxicity of its intermediate products declines significantly after breaking the benzene ring structure. Overall, this work provides greater understanding of the E3 degradation pathway and the toxicity of its degradation products. [ABSTRACT FROM AUTHOR] more...
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- 2024
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32. Na2WO4-doped Mn2O3-TiO2 oxygen carrier catalyst for chemical looping OCM: Redox catalysis and mechanistic insight.
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Lan, Tian, Sun, Weidong, Shi, Xuerong, and Lu, Yong
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OXYGEN carriers , *CHEMICAL-looping combustion , *CATALYST supports , *CATALYSIS , *OXIDATION-reduction reaction , *TITANIUM dioxide , *RADICALS (Chemistry) - Abstract
[Display omitted] • Chemical looping OCM is attractive method for conversion of CH 4 to C 2 H 4. • Qualified oxygen carrier catalyst is particularly desirable but remains challenging. • Na 2 WO 4 -doped Mn 2 O 3 -TiO 2 is a promising catalyst for the CL-OCM reaction. • This catalyst works efficiently at 740 °C via MnTiO 3 ↔ TiO 2 + Mn 2 O 3 redox cycle. • Doping of Na 2 WO 4 benefits the *CH 3 transfer and desorption to form ∙CH 3 radicals. Intrinsic safety chemical looping-oxidative coupling of methane (CL-OCM) is an attractive method for direct conversion of methane to ethylene, but well-qualified oxygen carrier catalyst still remains challenging. Herein, we report a promising Na 2 WO 4 -doped Mn 2 O 3 -TiO 2 catalyst toward high-efficiency CL-OCM process. The standout Na 2 WO 4 /2Mn1Ti (Mn 2 O 3 /TiO 2 weight ratio of 2/1) catalyst, with good cycling performance, achieves a high space time yield of 27.8 (or 22.9) g C2-C3 kg cat −1h−1 with 19.5 % (or 15.7 %) CH 4 conversion and 80 % (or 82.7 %) C 2 -C 3 selectivity at 740 (or 720) oC and a low catalyst/CH 4 weight ratio of 13.5. The TiO 2 substantially lowers the CL-OCM reaction temperature, due to the establishment of a low-temperature light-off "Mn 2 O 3 + TiO 2 ↔ MnTiO 3 " redox cycle with CH 4 /O 2. The enabling role of Na 2 WO 4 in modulating the reaction of Mn 2 O 3 with CH 4 into OCM instead of combustion is theoretically unveiled, which in nature benefits the *CH 3 transfer and spontaneous desorption to form ∙CH 3 radicals. [ABSTRACT FROM AUTHOR] more...
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- 2024
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33. Enhancement of TEA gas-sensitive properties by Mn2O3@In2O3 core-shell structured p-n heterojunction.
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Zhang, Zhenkai, Wu, Ran, Chen, Xingtai, Mu, Yang, Yang, Zhiguo, Liu, Zhenyue, Yue, Chen, Dastan, Davoud, Yin, Xi-Tao, and Liu, Tao
- Subjects
- *
P-N heterojunctions , *TEA , *MICROSPHERES - Abstract
In this study, the Mn 2 O 3 @In 2 O 3 core-shell structures were prepared by a two-step hydrothermal method for TEA detection. Characterization of the morphological composition reveals that Mn 2 O 3 @In 2 O 3 is a microsphere structure with Mn 2 O 3 as the core and In 2 O 3 as the shell. The results of the gas-sensitive performance tests showed that the response of Mn 2 O 3 @In 2 O 3 to 100 ppm TEA was 47 at 180 °C, which was a significant improvement over the original In 2 O 3 , and it had excellent long-term stability and reproducibility. The improved gas-sensitive properties are due to the special structure of the core-shell material and the successful construction of p-n heterojunctions between the interfaces. • Mn 2 O 3 @In 2 O 3 core-shell microspheres were prepared by a two-step thermal method. • The special structure of core-shell effectively enhances the gas sensitive property of TEA. • Mn 2 O 3 @In 2 O 3 core-shell has excellent response and long-term stability to TEA. [ABSTRACT FROM AUTHOR] more...
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- 2024
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34. Functionalized nitrogen doping induced manganese oxyhydroxide rooted in manganese sesquioxide rod for robust oxygen reduction electrocatalysis.
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Wei, Sisi, Yang, Guanhua, Niu, Shaoyang, Ma, Zhaoling, Jiang, Juantao, Liu, Kui, Huang, Youguo, Wang, Hongqiang, Cai, Yezheng, and Li, Qingyu
- Subjects
- *
OXYGEN reduction , *ELECTROCATALYSIS , *MANGANESE , *METAL-air batteries , *NITROGEN , *POWER density - Abstract
The rational synthesis of hybrid catalysts with diverse electrocatalytically active components for robust oxygen reduction reaction (ORR) is highly desirable for the development of sustainable metal-air batteries. By using melamine as nitrogen and hydrogen precursors, herein, melamine pyrolysis-induced functionalized nitrogen doping was adopted for the construction of nitrogen doped manganese oxides (N-MnO x Rs), which consists of manganese oxyhydroxide (MnOOH) rooted in manganese sesquioxide (Mn 2 O 3) rod, as a robust ORR electrocatalyst. Systematic studies have found that a suitable mass ratio of melamine to β-MnO 2 rods is necessary for the formation of electrocatalytically MnOOH and Mn 2 O 3. The representative N-MnO x Rs exhibits the nano structure consisting of interconnected nonorods, nanowires, and nanoparticles, which not only increases the exposure of more active sites but also enhances microstructure stability. Moreover, the nitrogen doping creates high content of oxygen vacancies, which accelerates electron transmission/transfer of N-MnO x Rs. As a result, the optimal N-MnO x Rs exhibits impressive ORR catalytic performance in a homemade ZAB. The N-MnO x Rs driven ZAB (176.6 mW cm-2; 811 mAh g-1) delivers a high peak power density and large discharging capacitance comparable to Pt/C driven one (178.1 mW cm-2; 800 mAh g-1), displaying a promising application potential. This work provides a functionalized nitrogen doping strategy for rational construction of robust hybrid electrocatalysts for energy conversion. • Functional nitrogen doping strategy was adopted for construction of MnOOH rooted in Mn 2 O 3 rod hierarchical electrocatalyst. • The nano hierarchical feature not only increases exposure of active sites but also enhances microstructure stability. • The representative N-MnO x Rs exhibits robust ORR catalytic performance comparable to Pt/C catalyst in a homemade ZAB. [ABSTRACT FROM AUTHOR] more...
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- 2024
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35. Efficient purification of tetracycline over ZIF-8-encapsulated Mn2O3 via persulfate activation: Pivotal roles of heterostructure and surface Mn(Ⅱ).
- Author
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Wang, Jinpeng, Zhang, Qingwen, Li, Yubiao, Gao, Caiyan, Jiang, Lisha, and Wu, Xiaoyong
- Subjects
- *
TETRACYCLINE , *TETRACYCLINES , *ELECTRON paramagnetic resonance spectroscopy , *ELECTRON paramagnetic resonance , *ELECTRON transport , *CHARGE exchange - Abstract
[Display omitted] • Tetracycline is effectively decontaminated by Mn 2 O 3 @ZIF-8 via PS activation. • OH, O 2 −, 1O 2 and reactive MnII (s) -S 2 O 8 2−* are involved tetracycline degradation. • Zn-O-Mn electron transport channel facilitates the electron transfer in PS activation. • MnII (s) on Mn 2 O 3 @ZIF-8 surface is the dominant sites for active species generation. Advanced oxidation processes (AOPs) based on persulfate (PS) activation is an extremely effective method to removal antibiotics in wastewater. In this process, endowing abundant active sites and rapid electron transfer channel over catalyst are two essential factors for high performance towards decontamination. Herein, a novel core–shell catalyst Mn 2 O 3 @ZIF-8 with large specific surface area was prepared to remove antibiotics via PS activation under visible light irradiation. Intriguingly, the removal efficiency of tetracycline (TC) by Mn 2 O 3 @ZIF-8 with optimal compound ratio was 3.2 times that of original Mn 2 O 3. The characterizations and density functional theory calculations proved that a Zn-O-Mn electron transfer channel was constructed in Mn 2 O 3 @ZIF-8 heterostructure, which greatly promoted electron transport and photogenerated electron-hole separation. In addition, the activation of PS and degradation of pollutants by Mn 2 O 3 @ZIF-8 was a highly surface-dependent reaction. The correlation between surface physicochemical properties and pollutant removal was further established to uncover the dominant active sites for PS activation. The quenching experiments and electron paramagnetic resonance (EPR) tests confirmed that PS was mainly activated by surface active MnII (s) and dissociated into reactive oxygen species OH, O 2 −, and 1O 2 , or formed reactive complexes MnII (s) -S 2 O 8 2−* to induce electron transfer and achieve TC oxidation. Besides, Mn 2 O 3 @ZIF-8 exhibited satisfactory removal of multiple pollutants and actual pharmaceutical wastewater as well as effective detoxification due to the coexistence of the above radicals and non-radicals pathways. The study provides novel insights into the design of high efficiency of Mn-based catalysts for antibiotic wastewater purification. [ABSTRACT FROM AUTHOR] more...
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- 2024
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36. XAFS spectrum of Manganese(iii) oxide
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0000-0002-2784-5797, Yuko Ichiyanagi, 0000-0002-2784-5797, and Yuko Ichiyanagi
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- 2023
37. XAFS spectrum of Manganese(iii) oxide
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0000-0003-1077-5996, Kiyotaka Asakura, 0000-0003-1077-5996, and Kiyotaka Asakura
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- 2023
38. XAFS spectrum of Manganese(iii) oxide
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Takanori Itoh and Takanori Itoh
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- 2023
39. XAFS spectrum of manganese (III) oxide
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Aichi SR and Aichi SR
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- 2023
40. Elaborating the effects of oxygen species in Ag[dbnd]O, Mn[dbnd]O, Mn-O-Mn, and Ag-O-Mn on CO oxidation using operando TPR-DRIFTS-MS.
- Author
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Xu, Jiacheng and Yao, Shuiliang
- Subjects
- *
OXIDATION , *STRUCTURE-activity relationships , *LOW temperatures , *OXYGEN , *CATALYTIC activity , *OXYGEN reduction - Abstract
The noble metal-doped Mn 2 O 3 catalyst has good activity at low temperature, but the structure-activity relationship between its catalytic activity and surface oxygen oxygens at low temperature is unclear. In this study, Mn 2 O 3 and Ag-Mn 2 O 3 prepared using aerosol pyrolysis method (Mn 2 O 3 -AP and Ag-Mn 2 O 3 -AP), and Ag-Mn 2 O 3 prepared using co-precipitation method (Ag-Mn 2 O 3 -CP) are selected to unveil the effect of oxygen species (Ag O, Mn O, and Mn-O-Mn (Ag-O-Mn)) in CO oxidation. Ag-Mn 2 O 3 -AP has better CO conversion (100%) at 100 °C. Operando TPR-DRIFTS-MS results show that Ag O plays an important role in CO oxidation at low temperatures. Ag O starts to react with CO above 50 °C. Mn-□-Mn (Ag-□-Mn) oxygen vacancies are beneficial for O 2 decomposition and promotes the regeneration of Ag O and Mn O, and Mn-O-Mn (Ag-O-Mn) above 200 °C. It is revealed that Ag O in the Ag-doped Mn 2 O 3 catalyst prepared using aerosol pyrolysis method effectively promoted the oxidation of CO at lower temperature. [Display omitted] • The effects of Ag O, Mn O, Mn-O-Mn, and (Ag-O-Mn) on CO oxidation were investigated. • Ag O plays a key role in CO low-temperature oxidation. • Ag-O-Mn is beneficial for O 2 decomposition and promotes Ag O regeneration. • Mechanisms of CO oxidation by oxygen species is proposed. [ABSTRACT FROM AUTHOR] more...
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- 2024
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41. Styrene removal by low-temperature catalytic oxidation using Mn2O3/Al2SiO5.
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Narindri Rara Winayu, Birgitta, Shih, Chia-Sheng, Tseng, Ting-Ke, and Chu, Hsin
- Subjects
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CATALYTIC oxidation , *STYRENE , *VOLATILE organic compounds , *CATALYTIC activity , *ENERGY consumption - Abstract
Highly efficient catalytic oxidation for the removal of volatile organic compounds (VOCs) is commonly accompanied by considerable energy demand to conduct the reaction at high temperature. Therefore, the development of low-temperature catalytic oxidation systems based on metal oxides has attracted widespread interest. In this study, we have assessed the performance of Mn 2 O 3 /Al 2 SiO 5 in catalyzing the oxidation of styrene. Tests were conducted in a fixed-bed reactor with different loadings of the supported catalyst under different operating conditions (concentration of styrene, oxygen availability, space velocity, and temperature). The characteristics of the catalyst and the reaction kinetics have been studied in detail. The best catalytic activity was achieved with 38 wt% Mn 2 O 3 /Al 2 SiO 5 , which gave 95% styrene conversion (T 95) at 298 °C. A space velocity of 5000 h−1 provided sufficient reaction time and favored the oxidation of styrene. The absence of O 2 significantly suppressed styrene conversion to 25.4%, but the presence of just 1% O 2 substantially enhanced its catalytic oxidation. A lower reaction temperature of 282 °C led to reduced performance of the catalyst, such that only 20% styrene conversion was achieved, which was due in part to extensive carbon deposition. [Display omitted] • 38 wt% Mn 2 O 3 /Al 2 SiO 5 had the best styrene conversion. • Available active site was influenced by the concentration of styrene. • Reduction of Mn 2 O 3 to Mn 3 O 4 was detected at the condition of 0% O 2. • Intense amount of carbon deposited for the case with 282 °C. • Deterioration of catalytic oxidation was caused by the highly blocking on active sites. [ABSTRACT FROM AUTHOR] more...
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- 2024
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42. Bimetallic NiO/Mn2O3 nano-pyramids as battery-type electrode material for high-performance supercapacitor application.
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Yaseen, Sara, Wattoo, Abdul Ghafar, Inayat, Abid, Shahid, Tauseef, Shaik, Mohammed Rafi, Khan, Mujeeb, Song, Zhenlun, and Abbas, Syed Mustansar
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SUPERCAPACITOR electrodes , *SUPERCAPACITORS , *ELECTRODE performance , *ELECTRODES , *ENERGY storage , *AQUEOUS electrolytes , *SURFACE morphology - Abstract
• Synthesis of NiO/Mn 2 O 3 nano-pyramids via composite hydroxide-mediated approach. • Enhanced ion transformation rate between electrolyte and electrode. • High specific capacitance of 1730.5 F g−1 at a low current density of 1.5 A g−1. • Excellent cyclic stability is perceived from NiO/Mn 2 O 3 nanocomposites. Herein, we report the synthesis of bimetallic oxide (NiO/Mn 2 O 3) as an efficient positive electrode for supercapacitor application prepared by a facile one-step composite hydroxide-mediated approach. Exceptional electrochemical performance has been achieved by optimizing the composition, structure, and morphology. Simple cubic crystal structure with bipyramid surface morphology provided a large specific surface area and more active sites for rapid transfer of ions between electrolyte and electrode. The electrochemical performance of prepared electrodes was examined in a three-electrode system, where nickel foam was used as a conductive support. From the electrochemical measurements, the NiO-50 % Mn 2 O 3 exhibited the highest specific capacitance of 1730.5 F g−1 at a current density of 1.5 A g−1 in a 3 M aqueous KOH electrolyte. The optimized electrode showed long-term cycling stability of 4000 charge-discharge cycles at a high retention rate of 97.5 % at 10 A g−1, which supports the excellent performance of the electrode and robust stability. Hence, owing to its unique bipyramid-like morphology, outstanding performance, and easy one-step synthesis process, NiO/Mn 2 O 3 bimetallic oxide can be considered an excellent candidate for supercapacitor electrodes. This method provides an efficient hybridization methodology for the design of high-performance electrode materials for advanced energy storage devices. [Display omitted] [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
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43. Фотоелектричні властивості гетеропереходу Mn2O3/n-InSe
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Tkachuk, I.G., Orletskii, I.G., Ivanov, V.I., Kovalyuk, Z.D., Zaslonkin, A.V., and Netyaga, V.V.
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селенід індію ,I-V characteristics ,Mn2O3 ,heterojunction ,фоточутливість ,indium selenide ,гетероструктури ,photosensitivity ,вольт-амперні характеристики - Abstract
Методом низькотемпературного спрей-піролізу виготовлено фоточутливі гетеропереходи Mn2O3/nInSe. На нагріту підкладку з шаруватого кристалу n-InSe розпилювався водний розчин відповідного складу. В результаті чого на його поверхі утворювалась тонка плівка Mn2O3. Використання шаруватих напівпровідників дозволяє отримувати якісні інтерфейси, навіть при значній розбіжності параметрів кристалічних граток контактуючих матеріалів. Фронтальний шар з широкозонного напівпровідника Mn2O3 є прозорим в області максимального поглинання світла у InSe. Це дозволяє ефективно експлуатувати фотоелектричні властивості останнього. Проведено дослідження фотоелектричних та оптичних властивостей отриманого гетеропереходу, побудовано відповідні графічні залежності: вольтамперні характеристики та диференційний опір при різних температурах, температурна залежність висоти потенційного бар’єру, спектральна залежність відносної квантової ефективності в інтервалі енергій фотонів 1.2÷3.2 eV. Запропоновано теоретичні моделі, що описують отримані результати. На основі аналізу температурних залежностей прямих і зворотних гілок вольт-амперних характеристик визначено енергетичні параметри гетеропереходу. Проведено оцінку величини послідовного та шунтуючого опорів. Визначені механізми формування прямого та зворотного струмів крізь енергетичний бар’єр Mn2O3/n-InSe. Photosensitive Mn2O3/n-InSe heterojunctions were produced by the method of low-temperature spray pyrolysis. An aqueous solution of the appropriate composition was sprayed onto a heated substrate made of a layered n-InSe crystal. As a result, a thin film of Mn2O3 was formed on its surface. The use of layered semiconductors makes it possible to obtain high-quality interfaces, even with significant differences in the crystal lattice parameters of the contacting materials. The front layer of the wide-gap semiconductor Mn2O3 is transparent in the region of maximum light absorption in InSe. This makes it possible to effectively exploit the photovoltaic properties of the latter. The photoelectric and optical properties of the obtained heterojunction were studied, the corresponding graphical dependences were constructed: current-voltage characteristics and differential resistance at different temperatures, temperature dependence of the height of the potential barrier, spectral dependence of the relative quantum efficiency in the photon energy range of 1.2÷3.2 eV. Theoretical models describing the obtained results are proposed. Based on the analysis of the temperature dependences of the direct and reverse branches of the current-voltage characteristics, the energy parameters of the heterojunction were determined. The value of the series and shunt resistances was evaluated. The mechanisms of the formation of forward and reverse currents through the Mn2O3/n-InSe energy barrier are determined. more...
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- 2023
44. Synthesis of cubic Mn2O3 and its catalytic performance in activating peroxymonosulfate for degradation of MB.
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He, Qi, Liao, Xiaogang, Li, Gang, He, Yuxin, and Shen, Jun
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PEROXYMONOSULFATE , *ELECTRON paramagnetic resonance , *METHYLENE blue , *WASTEWATER treatment - Abstract
In this study, uniform Mn 2 O 3 cubic with a size of 0.6–1.1 µm was prepared using a simple carbonate precipitation-calcination method, and its performance in activating peroxymonosulfate (PMS) for degradation of methylene blue (MB) was investigated. A single factor experiment was conducted to investigate the degradation of MB by taking process parameters as variables, such as catalyst amount, PMS dosage, initial MB concentration, reaction temperature and co-existed anions. The results showed that a MB degradation rate of 81.49% was achieved within 50 min under the reaction conditions: Mn 2 O 3 amount of 0.1 g/L, PMS dosage of 0.6 mmol/L, MB concentration of 10 mg/L, a total volume of 500 mL and reaction temperature of 25 °C. In addition, it was found that the introduction of C 2 O 4 2- or PO 4 3- had a negative effect on MB degradation, with inhibition ratio reaching 33.08% and 17.47%, respectively. However, Cl- had no inhibitory effect on MB degradation. Furthermore, reactive species in the system of Mn 2 O 3 /PMS were identified by electron paramagnetic resonance (EPR) tests, and results showed that •OH, SO 4 •-, •O 2 – and 1O 2 all participated in the MB degradation process. Moreover, Mn 2 O 3 exhibited stable catalytic performance during four consecutive cycling runs, indicating that the as-prepared cubic Mn 2 O 3 is expected to be a potential catalyst for PMS activation and dye wastewater treatment. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
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45. Fabrication, structural, morphological, and optical features of Mn2O3 polyhedron nano-rods and Mn2O3/reduced graphene oxide hybrid nanocomposites.
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Gomaa, Islam, Abdel-Salam, Ahmed I., Khalid, A., and Soliman, T.S.
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GRAPHENE oxide , *BAND gaps , *POLYHEDRA , *TRANSMISSION electron microscopes , *NANOCOMPOSITE materials , *OPTICAL properties - Abstract
• Mn 2 O 3 -reduced Graphene Oxide (Mn 2 O 3 -rGO) nanocomposite was synthesized via hydrothermal and sonochemical method. • XRD, FTIR, and Raman analysis revealed the impact of rGO on the Mn 2 O 3 morphology. • The optical properties of Mn 2 O 3 and Mn 2 O 3 -rGO have been studied. Mn 2 O 3 and Mn 2 O 3 /reduced graphene oxide (rGO) composites were prepared by the hydrothermal and sonochemical method, respectively. The prepared samples were characterized via X-ray diffraction, Transmission electron microscope, Fourier transform infra-red, and Raman spectroscopy. Di-Manganese tri oxide morphology appeared new morphology as polyhedron prism nano-rods as to the best of our knowledge, no work has described before for Mn 2 O 3 nanoparticles (NPs). The Raman vibrational band at 694 cm−1 is related to the Mn-O bond of trivalent manganese ions (Mn3+). XRD and TEM analysis confirmed the decrease of particle sizes with the insertion of rGO sheet to the matrix. The optical properties were measured by UV–visible spectrometer. The obtained data from the absorption spectra was used to investigate the optical parameters. The optical band gap was tuned to a lower value of about 1.57 eV and the refractive index increased from 4.031 for Mn 2 O 3 to 4.429 for Mn 2 O 3 /rGO. The obtained results revealed that the optical and morphological structure of Mn 2 O 3 were enhanced via the addition of rGO sheets to the matrix which make it useful in optoelectronic applications. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
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46. Synthesis of porous Mn2O3 architecture for supercapacitor electrode application.
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Shao, Dan, Li, Xuelian, Yang, Min, Li, Jing, Chen, Rujie, Zheng, Xinmei, Niu, Yongfang, and Qi, Yanxing
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SUPERCAPACITOR electrodes , *TRANSITION metal oxides , *SURFACE area , *ELECTRODE potential , *POROUS materials , *SUPERCAPACITORS - Abstract
Transition metal oxides (TMOs) are a potential candidate for supercapacitor due to its outstanding characteristics such as cheap, abundant and non-toxic. But poor electron conductivity and large volume expansion at charge/discharge process limit their practical application as electrode materials. It is a feasible strategy to design porous TMOs which could provide high surface area and more electroactive sites to improve electrochemical performance. Herein, a porous Mn 2 O 3 was synthesized by hard-template method using MCM-41 as template. It exhibits superior pore property of high specific surface area of 382 m2 g−1. And applied it as electrode material for supercapacitor, the porous Mn 2 O 3 shows higher specific capacitance of 102 F g−1 compared to 4.88 F g−1 and 2.28 F g−1 of two types of block Mn 2 O 3 with surface area 7.27 m2 g−1 and 2.67 m2 g−1 at discharging current density of 0.2 A g−1. Furthermore, it exhibits excellent long cycle stability in that specific capacitance remains stable after 5000 cycles (137% of the initial value). This research demonstrates that the porous Mn 2 O 3 has broad potential as promising electrode materials for supercapacitors. [Display omitted] [ABSTRACT FROM AUTHOR] more...
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- 2023
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47. Surface lattice oxygen mobility inspired peroxymonosulfate activation over Mn2O3 exposing different crystal faces toward bisphenol A degradation.
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Li, Min, Zhang, Hao, Liu, Zhiliang, Su, Yiguo, and Du, Chunfang
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PEROXYMONOSULFATE , *CRYSTAL lattices , *ACTIVATION energy , *OXYGEN , *WATER pollution , *REACTIVE oxygen species , *BISPHENOL A - Abstract
Mn 2 O 3 exposing faces (2 2 2) and (2 1 1) with higher surface lattice oxygen mobility could efficiently inspire peroxymonosulfate activation. [Display omitted] • Mn 2 O 3 -P exposing (2 1 1) and (2 2 2) faces displays the higher catalytic efficiency. • Faces (2 1 1) and (2 2 2) own the lower migration energy barrier and adsorption energy. • High lattice oxygen migration and MnⅣ-MnIII/Ⅱ conversion enable efficient PMS activation. The rod-like, spherical, flake-like and granular Mn 2 O 3 microcrystals exposing different crystal faces were prepared and used for peroxymonosulfate (PMS) activation to degrade bisphenol A (BPA). Granular Mn 2 O 3 -P exposing (2 1 1) and (2 2 2) crystal faces displayed the superior degradation efficiency toward BPA than the other three samples. DFT results pointed out that the migration energy barriers of lattice oxygen on crystal faces (2 2 2) and (2 1 1) were lower than that of face (4 0 0). Moreover, the adsorption energies of PMS molecules on faces (2 2 2) and (2 1 1) were more negative. The high lattice oxygen migration of faces (2 1 1) and (2 2 2) and MnⅣ-MnIII/Ⅱ conversion were contributory to the generation of oxygen vacancies to adsorb PMS and O 2 , leading to the production of more active species (SO 4 •-, •OH and 1O 2) in the catalytic process. This work contributes an excellent catalyst with efficient catalytic performance and cycle stability for water pollution treatment. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
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48. Templated formation of Mn2O3 derived from metal-organic frameworks with different organic ligands as anode materials for enhanced lithium-ion storage.
- Author
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Zhang, Xiaoke, Du, Wenqing, Lin, Zhi, Tan, Xiaohong, Li, Yilin, Ou, Guanrong, Xu, Xuan, Lin, Xiaoming, Wu, Yongbo, Zeb, Akif, and Xu, Zhiguang
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METAL-organic frameworks , *TRANSITION metal oxides , *ISONICOTINIC acid , *ANODES , *LIGANDS (Chemistry) - Abstract
Traditional manganese trioxide (Mn 2 O 3) as anode materials can be applied to lithium-ion batteries (LIBs), where it possesses excellent electrochemical performance. However, the inherent disadvantages of volume change and poor cycling stability during charge/discharge process hinder the application of transition metal oxide (TMO) in LIBs. Herein, we propose a method to derive Mn 2 O 3 from metal-organic framework in order to mitigate volume change and enhance cycling stability, by virtue of the introduction of oxygen vacancies (O V) and stable template-derived structure for boosted lithium storage properties. Interestingly, M-BTEC (pyromellitic acid based MOF) -derived Mn 2 O 3 represented higher specific capacity of 1227.1 mAh g−1 until 200 cycles with the current density of 0.1 A g−1 while M-IN (isonicotinic acid based MOF) shows 723.4 mAh g−1 with exceptional cycling stability. [Display omitted] • Two different ligands were used to synthesized Mn 2 O 3 and both of which possess cyclic stability and unique structure. • Oxygen vacancies was conducive to boost lithium ion storage performance. • M-BTEC and M-IN displays excellent capacity of 1227.1 mAh g−1while M-IN shows 723.4 mAh g−1 (200 cycles at 0.1 A g−1) [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
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49. Oxygen vacancies enriched MOF-derived MnO/C hybrids for high-performance aqueous zinc ion battery.
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Sun, Kaisheng, Pang, Jianxiang, Zheng, Yang, Xing, Fayan, Jiang, Rong, Min, Jun, Ye, Jiahui, Wang, Liping, Luo, Yun, Gu, Tiantian, and Chen, Long
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ZINC ions , *SOLID state batteries , *LEAD oxides , *OXYGEN , *METAL-organic frameworks , *CHEMICAL kinetics - Abstract
Manganese-based oxides are considered as a promising class of zinc storage materials. However, the dissolution problem of manganese-based oxides leads to a sharp decay of its capacity, hindering its further development. Herein, Mn-metal organic framework (Mn-MOF) derived manganese-based oxide hybrids are synthesized and developed to suppress the dissolution of manganese. The incorporation of oxygen vacancies can tune the electronic rearrangement and crystal microstructure via the different calcination atmospheres of air (Mn 2 O 3) and Ar (MnO/C). Furthermore, the oxygen vacancy can effectively improve the conductivity, which promotes the reaction kinetics and electrochemical performance of manganese-based oxide hybrids. In addition, the storage mechanism of manganese-based oxide hybrids with oxygen vacancies on the insertion and de-intercalation of H+/Zn2+ is demonstrated. Oxygen vacancies enriched MnO/C hybrid cathode shows a high specific capacity of 336.8 mAh g−1 (0.1 A g−1) and the reversible capacity retention 73.8 % after 10,000 cycles at 1.0 A g−1, suggesting excellent long-cycle stability. Significantly, the solid-state zinc ions batteries (ZIBs) is assembled and exhibits a reversible capacity of 58.0 mAh g−1 at 1.0 A g−1. These results suggest that oxygen vacancies provide an effective strategy for exploring high-performance MOF-derived cathodes in aqueous batteries. In this work, we calcined Mn-BTC under Ar and air to obtain MnO/C and Mn 2 O 3 respectively. MnO/C has more oxygen vacancies and better electrochemical performance. Applied to zinc ion battery, specific capacity reaches 336.8 mAh g−1 at 0.1 A g−1, showing excellent zinc storage performance. [Display omitted] • MOF derived MnO with bulk oxygen deficiency and carbon coating structure for ZIBs. • The effect of oxygen vacancies on electrochemical performance is analyzed. • PVA gel electrolyte is successfully prepared and MnO/C is applied to all solid state batteries. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
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50. Modifying acidic oxygen production properties of PbO2 by porous Mn2O3 microspheres for boosting stability.
- Author
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Wei, Jinlong, Wang, Junli, Wang, Xuanbing, Jiang, Wenhao, Hu, Nianxiang, Wang, Li, Li, Min, Xu, Ruidong, and Yang, Linjing
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- *
HYDROGEN evolution reactions , *OXYGEN evolution reactions , *POWER resources , *OXIDATION of water , *SERVICE life , *URANIUM-lead dating - Abstract
Designing active and durable cost-effective electrocatalysts for catalyzing the oxygen evolution reaction (OER) under a strongly acidic environment is a highly promising approach for OER-associated sustainable energy supplies. Herein, a Pb-Sn-Ca/α-PbO 2 /β-PbO 2 -Mn 2 O 3 (PSC/PbO 2 -Mn 2 O 3) composite electrode is fabricated via a simple two-step process. First, porous Mn 2 O 3 microspheres are synthesized by the solvothermal method. Then, a PSC/PbO 2 -Mn 2 O 3 composite electrode with a special embedded structure is prepared through the introduction of Mn 2 O 3 by composite electrodeposition. The low OER overpotential (621 mV) of the PSC/PbO 2 -Mn 2 O 3 (12 g L −1) composite electrode is reduced by 445 mV compared with that of the industrial Pb-(0.76 wt%) Ag electrode at a current density of 50 mA cm−2. In addition, it shows a service life of up to 91 h at a high operation current density of 1.5 A cm−2 in acidic media (3.06 g L −1H+), which indicates its excellent stability. Therefore, this work not only demonstrates a design for a durable and high-efficiency electrocatalyst for acidic water oxidation but also provides strategies for the synthesis of advanced electrocatalytic electrodes. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
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