Search

A CoMoS composite is synthesized to combine the benefits of cobalt and molybdenum sulfides as an anodic material for advanced lithium‐ion batteries (LIBs). The synthesis is accomplished using a simple two‐step hydrothermal method and the resulting CoMoS nanocomposites are subsequently encapsulated in a carbonized polydopamine shell. The synthesis procedure exploited the self‐polymerization ability of dopamine to create nitrogen‐doped carbon‐coated cobalt molybdenum sulfide, denoted as CoMoS@NC. Notably, the de‐lithiation capacity of CoMoS and CoMoS@NC is 420 and 709 mAh g⁻1, respectively, even after 100 lithiation/de‐lithiation cycles at a current density of 200 mA g⁻1. Furthermore, excellent capacity retention ability is observed for CoMoS@NC as it withstood 600 consecutive lithiation/de‐lithiation cycles with 94% capacity retention. Moreover, a LIB full‐cell assembly incorporating the CoMoS@NC anode and an NMC‐532 cathode is subjected to comprehensive electrochemical and practical tests to evaluate the performance of the anode. In addition, the density functional theory showcases the increased lithium adsorption for CoMoS@NC, supporting the experimental findings. Hence, the use of dopamine as a nitrogen‐doped carbon shell enhanced the performance of the CoMoS nanocomposites in experimental and theoretical tests, positioning the material as a strong candidate for LIB anode. [ABSTRACT FROM AUTHOR]

An essential key to enhancing the specific capacity and cyclic stability of transition metal oxide materials is the hybridization of carbon compounds by binder-free methods for supercapacitors. Carbonaceous compounds shorten the electron-ion diffusion pathways due to their high active surface area and conductivity. Herein, we focus on improving the specific energy, stability, and conductivity of the electrode by the incorporation of nanosized carbon material. The integration of nano carbons from viable eco-friendly glucose with CoMoO4 enhanced the experimental specific capacity of the electrode. The self-grown CoMoO4 on a nickel foam (CMO-NF) was confirmed as the best approach after extensive optimization process by the feasible hydrothermal (HT) method. The amount of carbon deposited and the structural morphology on the fabricated CoMoO4-glucose-derived carbon (CMO-GC) electrode was varied by adjusting the concentration of glucose by the viable HT technique. Notably, the hybrid CMO-GC-2 achieved a maximum specific capacity of 851.85 C g−1 at 1 A g−1, and it is relatively higher than that of CMO-NF (301.4 C g−1). The asymmetric supercapacitor device (CMO-GC-2//AC) demonstrated excellent energy density (36.86 W h kg−1 for 152.84 W kg−1), power density (3209.35 W kg−1 for 11.19 W h kg−1), and extensive capacity retention of 87% for up to 5000 cycles. The high performance is related to the synergetic effect of EDLC and the redox reaction, with nano-architecture and well-defined morphology of the electrode material. [ABSTRACT FROM AUTHOR]

Recycling all components of waste lithium-ion batteries (WLIBs) can fulfill the economic benefits, compensate for the scarcity of materials, and effectively reduces environmental pollution. However, anode part recycling is not much attractive compared to the highly valuable metal resources containing cathode parts due to its low added value and intricate steps in the recycling process. Therefore, developing anode recycling techniques is crucial to contribute to the industrial large-scale recycling process in the future. Herein, an efficient recycling method is proposed to recycle the anode material consisting of Cu foil and graphite for battery applications. The recovered anode is reused for the preparation of Cu-BTC MOF-derived CuO (R-CuO) as well as graphite purification via the acid-lixiviation process in a single step. The purified graphite (PG) revealed its superior electrochemical properties by displaying 360.2 mA h g−1 after a stable cycle performance of 200 cycles for the Li-ion (LIB) application. Later, the electrochemical performance of the prepared R-CuO is studied in the lithium-ion (LIB) and sodium-ion battery (SIB) half-cell configurations. R-CuO exhibits maximum reversible discharge capacities of 515 and 289 mA h g−1 after reaching 200 cycles for LIB and SIB, respectively with remarkable cycling stability and rate performance. [Display omitted] • Spent lithium-ion batteries anode materials have been recycled and reused. • Graphite purified and regenerated in a single step acid treatment process. • Copper foil transformed to copper (II)-benzene-1,3,5-tricarboxylate successfully. • Purified graphite displays 360.2 mA h g−1 even after 200 cycles for Li-ion battery. • Cu-BTC MOF derived CuO displayed good performance for Li-ion and Na-ion battery. [ABSTRACT FROM AUTHOR]

[Display omitted] • Stable plasma generation in reactor configuration comprising multiple honeycomb monoliths. • Linear relationship between discharge power and increased number of monoliths. • High ethylene adsorption capacity in an open channeled monolith catalyst at humid conditions. • Higher ethylene removal efficiency with high energy yield at low energy requirement. • Simplified overall system and operation at atmospheric conditions. Dilute ethylene (C 2 H 4) was removed in a novel plasma reactor comprising multiple honeycomb monoliths consisting of up to four PdO/ZSM-5/monolith catalysts. These monoliths were packed in a tubular reactor separated by mesh electrodes alternatively grounded or connected to a high voltage (HV) power source. The effect of the number of monoliths on the discharge power, adsorption, and removal of C 2 H 4 was investigated. Additionally, the influence of the energy input, C 2 H 4 inlet concentration, and gas flow rate on the C 2 H 4 abatement was examined. The adsorption capacity, C 2 H 4 conversion, and energy efficiency were observed to increase as the number of monoliths increased. The effect of the palladium (Pd) loading technique, namely ion exchange (IE), incipient wetness impregnation (IM), and combined IE-IM, IE followed by IM, on the C 2 H 4 adsorption was also studied. The combined IE-IM method presented an exceptional adsorption capacity of ∼136 µmol/g catalyst under humid conditions despite nonpolar nature of C 2 H 4. C 2 H 4 removal was performed via both continuous and cycled storage-discharge (CSD) plasma-catalytic oxidation processes. The CSD process was conducted in two ways: with intermittent C 2 H 4 feed (CSD-IEF) and with maintained C 2 H 4 feed (CSD-MEF), both comprising intermittent plasma discharge. Intriguingly, the performance of the CSD-MEF process was superior (56 J/L, 1.61 g/kWh) to that of the CSD-IEF (119 J/L, 0.98 g/kWh), and continuous process (∼228 J/L, 0.53 g/kWh) in terms of energy efficiency as well as the overall simplicity of the system. [ABSTRACT FROM AUTHOR]

Herein, cherry flower waste-derived activated carbon (CFAC) with self-doped nitrogen is synthesized as a viable energy storage material for green and sustainable energy solutions. The activated carbon derived in this way is examined as an electric double-layer capacitance (EDLC)-type electrode material and sodium-ion battery (NIB) electrode material, and commendable performance is demonstrated for both of these energy storage applications. The specific surface area (SSA) and nitrogen content are observed to play a very delicate role in determining the charge storage ability of the CFAC, and the performance is optimized only by carefully balancing both of these properties. The optimized CFAC electrode supplied an excellent performance with a specific capacitance of 333.8 F g−1 and capacity is maintained to more than 96% even after 38,000 charge-discharge cycles as an EDLC-type supercapacitor electrode material. Likewise, the CFAC/NIB also yielded remarkable performance with an average specific capacity of 150 mAh g−1 and capacity retention of more than 84% after 200 charge-discharge cycles. Furthermore, an electrokinetic study was performed for both supercapacitor and NIB applications to identify the contribution from surface and diffusion type charge storage phenomena, consequently highlighting the role of the SSA and nitrogen content in the CFAC matrix. [Display omitted] • Scalable synthesis of cherry flower waste-derived activated carbon (CFAC). • CFAC shows a significant amount of self-doped nitrogen and a large SSA. • Applied as an EDLC type supercapacitor and sodium-ion battery electrode material. • 334 F g−1 sp. Capacitance and over 96% capacity retention after 38,000 cycles. • Commendable sodium-ion battery performance with high sp. Capacity and stability. [ABSTRACT FROM AUTHOR]

[Display omitted] • A lead-free FPENG was developed based on a novel ZnO–ZnWO 4 @PDMS. • The incorporation of ZnWO 4 with ZnO exhibited an excellent synergistic effect. • The piezoelectric response of the composite is 1.32 V (∼4 times better than ZnWO 4). • With finger tapping motion, a 1 μF capacitor is charged within 56 s and powered LED. • Real-time early safety warning alarm system was demonstrated. With the rapid development of research world, the number of researchers and research laboratories is increasing rapidly. Simultaneously, accidents in laboratories are on the rise, drawing significant attention from everyone. To address this issue, the current study demonstrates a real-time safety early warning alarm system aimed at preventing accidents and enhancing safety management in laboratories. We developed a zinc tungstate nanoparticles (NPs) integrated on zinc oxide hexagonal microdiscks (h -MDs) (ZnO–ZnWO 4 @PDMS) composite based on a novel flexible piezoelectric nanogenerator (FPENG). The observed piezoelectric response was 1.32 V, which is ∼4 times better than that of pure ZnWO 4 , owing to the synergistic effect of ZnO–ZnWO 4 @PDMS. When subjected to finger-tapping motion, the FPENG can charge a 1 μF capacitor, and it reached 81 mV within 56 s. Subsequently, the light-emitting diodes (LEDs) are powered with amplification. The FPENG system was demonstrated and validated through real-time application in the laboratory setting, marked as a "caution/restricted" line. The application of the system demonstrated its capability to simultaneously illuminate LEDs and sound alarms when people touch or cross the caution line. Furthermore, the proposed FPENG exhibited ∼660 mV even ∼90 % humidity, with no noticeable electrical changes under different solvents, confirming that the proposed FPENG is not affected by varying humidity and various indoor conditions. These outstanding results and real-time demonstrations unequivocally establish the feasibility of this system in contexts such as bank lockers, metro systems, hilly areas, and more. [ABSTRACT FROM AUTHOR]

Zinc–air batteries (ZABs) have garnered significant interest as a viable substitute for lithium-ion batteries (LIBs), primarily due to their impressive energy density and low cost. However, the efficacy of zinc–air batteries is heavily dependent on electrocatalysts, which play a vital role in enhancing reaction efficiency and stability. This scholarly review article highlights the crucial significance of electrocatalysts in zinc–air batteries and explores the rationale behind employing Fe-Co-Ni-Zn-based metal–organic framework (MOF)-derived hybrid materials as potential electrocatalysts. These MOF-derived electrocatalysts offer advantages such as abundancy, high catalytic activity, tunability, and structural stability. Various synthesis methods and characterization techniques are employed to optimize the properties of MOF-derived electrocatalysts. Such electrocatalysts exhibit excellent catalytic activity, stability, and selectivity, making them suitable for applications in ZABs. Furthermore, they demonstrate notable capabilities in the realm of ZABs, encompassing elevated energy density, efficacy, and prolonged longevity. It is imperative to continue extensively researching and developing this area to propel the advancement of ZAB technology forward and pave the way for its practical implementation across diverse fields. [ABSTRACT FROM AUTHOR]

Recently, Zeolitic Imidazolate Frameworks (ZIFs) and their hybrid composites have incited a lot of interest in the research community and have shown promising potential in supercapacitors owing to their excellent conductivity, high surface area, tunable structure, rich redox chemistry, composition diversity, etc. Even though many ZIFs are being studied for the advancement of electrode materials used for energy storage applications, in this review, we are focused on ZIF-8 and ZIF-67 only. The electrochemical performance of pure ZIFs is poor due to low electronic conductivity and poor cycling life. To counter this, ZIFs are mixed with other materials like conducting polymers, other transitional metals composites, and activated carbons to prepare hybrid composites. Furthermore, the highly porous structure and large surface area of the ZIFs cage act as an ideal template for designing composites with excellent supercapacitor applications. This reviewis focus on the synthesis and electrochemical performance of such materials. This review is divided into two main parts: the design and synthesis of ZIF-8 and ZIF-67 derivatives for supercapacitor applications and the electrochemical performance of ZIF-8 and ZIF-67-based derivatives in three-electrode and two-electrode setups. Lastly, the challenges and obstacles encountered while employing ZIF-8 and ZIF-67-based composites in supercapacitors will be reviewed and commented on. [ABSTRACT FROM AUTHOR]

The logical design and engineering of bimetallic oxide nanomaterials with porous carbon materials have had a significant impact on the development of high-performance electrode materials for energy storage devices in recent years. The vertical and uniform building of porous multimetal nanomaterials on the surface of nanoscale carbon fibers is difficult but not impossible. We present a self-templated metal-organic framework (MOF)-based strategy for the synthesis and assembly of bimetallic oxides/nanoporous carbon nanostructures (Ni–Fe–O/NPC) on porous carbon nanofibers (PCNFs). The vertical alignment of Ni–Fe–O/NPC at PCNFs favors a fast redox reaction by shortening the ion/electrode diffusion path at the electrode-electrolyte interface and helps enhance the overall electrochemical performance. As a freestanding electrode for supercapacitors, it has a high specific capacitance of 1419 F g−1 at 1 A g−1 and good cycling life with capacitance retention of approximately 88.5% after 10,000 cycles. The Ni–Fe–O/NPC@PCNFs-400//Fe 2 O 3 /NPC@PCNFs asymmetric supercapacitor (ASC) achieves a high energy density of 41.3 Wh kg−1 at a power density of 892.2 W kg−1 with a long cycle of life (20,000 cycles) and a high rate capability (78.6%), indicating its potential applications. [Display omitted] • MOF-derived metallic oxides on PCNFs as free-standing electrode materials for ASC. • Tetragonal rodlike Ni–Fe–O/NPC@PCNFs is successfully grown using Ni–Fe-MOF@PCNFs. • Vertical alignment of Ni–Fe–O/NPC at PCNFs provides sufficient redox-active sites. • The assembly of Ni–Fe–O/NPC@PCNFs//Fe 2 O 3 /NPC@PCNFs as an ASC delivers high energy density. [ABSTRACT FROM AUTHOR]

The effective removal of dilute ethylene in a novel honeycomb plasma reactor was investigated using a honeycomb catalyst (Pd/ZSM-5/monolith) sandwiched between two-perforated electrodes operating at ambient temperature. Herein, the dependence of catalyst performance on the binder fraction, catalyst preparation method, and catalyst loading was examined. Ethylene removal was carried out by a process comprising cycles of 30-min adsorption conjugated with 15-min plasma-catalytic oxidation. Interestingly, the performance of the cyclic process was superior to continuous plasma-catalytic oxidation and thermally activated catalyst in terms of energy conservation, i.e., ~36 compared to ~105 and ~300 J/L, respectively. Hence, the novel cyclic process can be considered advanced-oxidation technology that features room-temperature oxidation, offers low energy consumption, negligible hazardous by-products emissions such as NO x and O 3. Moreover, the process operated under described conditions: low-pressure drop, ambient atmosphere, a mechanically stable system, and a simple reactor configuration, suggesting the practical applicability of this plasma process. [Display omitted] • Successful generation of stable plasma in practical-scale honeycomb monolith. • Uniform and robust catalyst washcoat deposited on honeycomb monolith at 8% binder. • High ethylene removal efficiency (~95%) with low energy input (~36 J/L). • Ethylene treatment under surrounding ambient conditions without toxic byproducts. [ABSTRACT FROM AUTHOR]

The effect of the reactor configuration and several key parameters such as the gas temperature, humidity, and flow rate on the corona discharge plasma in honeycomb monoliths was investigated. The AC corona discharge-based plasma reactor consisted of two parallel electrodes (perforated disk/wire-mesh) placed at both ends of the honeycomb monolith. Although the wire-mesh electrode offers increased sharpness, the perforated disk electrode, where the corona discharge started at the sharp edges of the holes, produced more discharge power because of the larger effective electrode area. Loading a small amount of metal onto the monolith was found to increase the discharge power significantly. Coating the monolith with a zeolite such as ZSM-5 (Si/Al: 23.9) led to a decrease in the discharge power because of its hydrophobic nature and large surface area. The result also revealed that the operating temperature, the humidity of the feed gas, and the gas velocity were key factors affecting the discharge performance. The discharge power was inversely proportional to the temperature. On the other hand, the use of a high-velocity feed gas with high water vapor content was found to be particularly advantageous for obtaining high discharge power. ga1 • A honeycomb plasma reactor for practical-environmental applications. • Successful generation of large-volume air plasma in commercial monoliths. • Enhancing discharge power by metal-coating over commercial monolith. • Increase in discharge power with increasing either air flow rate or humidity. [ABSTRACT FROM AUTHOR]

[Display omitted] • This work explores MXene and cobalt oxide nanoparticle composites for supercapacitors. • The Co@MXene- composite exhibits a specific capacitance of 732.5 F g−1 at 1 A g−1. • The ASC device (Co@MXene-2//AC) demonstrates a maximum energy density of 26.6 Wh Kg−1 at 700 W Kg−1 power density. • Hierarchical MXene/transition metal oxide composite enhances electrochemical performance for energy storage. The 2D layered material, MXene has incited a lot of interest in energy storage research due to its high metallic conductivity, high hydrophilicity, high energy storage capability, biocompatibility, and excellent electrochemical activity due to rich surface chemistry. However, the restacking of MXene layers lowers the number of active sites in MXene, which in turn limits the use of MXene in supercapacitors. Furthermore, the narrow working potential window of MXene limits the energy density of the electrodes. To address these issues and improve the electrochemical performance of MXene, several hierarchical MXene/transition metal oxide composites have been synthesized and characterized. This work explores MXene and its composites with cobalt oxide nanoparticles for supercapacitor applications. The Co@MXene composite was synthesized by using a one-pot hydrothermal method. As prepared, the nanocomposite exhibited a specific capacitance of 732.5 F g−1 at 1 A g-1 current density and excellent cycling stability of 83% over 5000 cycles. The as-fabricated ASC device (Co@MXene-2//AC) demonstrates the maximum energy density of 26.6 Wh Kg−1 at 700 W Kg−1 power density. The above results illustrate that MXene/transition metal oxide nanocomposite can be an alternative to enhance electrochemical performance for energy storage applications. [ABSTRACT FROM AUTHOR]

[Display omitted] • In-plasma is superior to injected-plasma catalysis for NO x removal at low temperatures. • Significant synergy between plasma and catalyst for NO x removal at low temperatures. • NO x removal efficiency up to 70% by assisting plasma at [200–250 °C] temperature. • Energy delivery through plasma is better than a thermal process for NO x removal. • Injected-plasma catalysis has potential applications in circumstantial high-throughput gas. Plasma-assisted hydrocarbon selective catalytic reduction (HC-SCR) of NO x was investigated by a packed Ag/γ-Al 2 O 3 catalyst in a dielectric barrier discharge reactor at low temperatures. The effect of plasma discharge on NO x removal was investigated with two methods for comparison, in- and injected-plasma catalysis systems. In-plasma catalysis comprised a plasma-catalytic discharge with the entire feed gas, and injected-plasma catalysis incorporated a part of feed gas consisting of dodecane pretreated with the plasma-catalytic discharge and mixed with the remaining gas before passing through the catalyst-alone stage. Here, using the surface response method with temperature and specific energy input (SEI) as independent variables, the results revealed that energy delivery through plasma gained more NO x removal efficiency than that by thermal catalyst process; a set of SEI and temperature is needed to obtain a similar level of NO x removal. There is a significant synergy between plasma and catalyst in in-plasma catalysis at low temperatures (≤250 °C) that increased NO x removal efficiency up to Δη = 50% (SEI = 137 J/L; T = 200 °C). In-plasma catalysis is superior to injected-plasma catalysis for enhancing the NO x removal and widening the temperature window of effective NO x removal owing to the plasma-catalytic interface in-plasma catalysis supplies. Interestingly, the results also revealed that the plasma in the catalyst for both methods did not always improve the NO x removal efficiency. The plasma had a negative effect on NO x removal at sufficient temperature and SEI. As a result, the in-plasma catalysis presented a high NO x removal efficiency; it can be higher than 70% at temperatures of 200–250 °C. However, injected-plasma catalysis has potential applications in circumstantial high-throughput gas due to low plasma energy consumption by adjusting the entire feed to plasma-treated gas ratio. [ABSTRACT FROM AUTHOR]

[Display omitted] • Bi-metallic MOF-derived (Ni-Fe)-P-C@HCNFs and Fe P C@HCNFs are obtained as positive and negative electrodes of ASC. • Co-existence of redox-active bi-metallic phosphide at the inside and outside of HCNFs improves redox kinetics. • The (Ni-Fe)-P-C@HCNFs showed a high specific capacitance of 1392 F g−1 at 1 A g−1. • As fabricated ASC device shows a maximum energy density of 62.7 W h kg−1 at 8.23 kW kg−1 of power density. Bi-metallic metal–organic framework (MOF) generated phosphides within and outside the hollow carbon nanofibers (HCNFs) show remarkable potential for energy storage owing to their improved conductivity and high specific capacitance. A novel approach is used to synthesize (Ni-Fe)-P-C on the outer and inner surfaces of HCNFs. The synthesized material's substantial electrochemical performance is owing to the co-existence of numerous Ni and Fe-based redox-active species with porous carbon and open channels from MOF-derived Carbon at HCNFs for fast electrolyte ions/electron diffusion. Consequently, the (Ni-Fe)-P-C@HCNFs electrode has a high specific capacitance of 1392 F g−1 at 1 A g-1 and good cycling stability, with capacitance retention of approximately 89 % at 25 A/g. Moreover, after 10,000 cycles, the asymmetric supercapacitor (ASC): (Ni-Fe)-P-C@HCNFs//Fe P C@HCNFs has an optimal energy density of 62.7 Wh kg−1 and a power density of 8238.2 W kg−1, with cycling stability of 92.4 percent at a high current density of 25 A g-1. [ABSTRACT FROM AUTHOR]