42 results on '"Yinyi Gao"'
Search Results
2. Direct regeneration of spent graphite anode material via a simple thermal treatment method.
- Author
-
Xiaoxue Li, Baoyu Wu, Hao Sun, Kai Zhu, Yinyi Gao, Tianzeng Bao, Hongbin Wu, and Dianxue Cao
- Published
- 2024
- Full Text
- View/download PDF
3. A Long Cycle Stability and High Rate Performance Organic Anode for Rechargeable Aqueous Ammonium-Ion Battery
- Author
-
Shengnan Zhang, Kai Zhu, Yinyi Gao, and Dianxue Cao
- Subjects
Fuel Technology ,Renewable Energy, Sustainability and the Environment ,Chemistry (miscellaneous) ,Materials Chemistry ,Energy Engineering and Power Technology - Published
- 2023
- Full Text
- View/download PDF
4. A Novel Graphene Based Bi‐Function Humidity Tolerant Binder for Lithium‐Ion Battery
- Author
-
Shu Dong, Kai Zhu, Xiaotong Dong, Guangsheng Dong, Yinyi Gao, Ke Ye, Jun Yan, Guiling Wang, and Dianxue Cao
- Subjects
General Materials Science ,General Chemistry - Published
- 2023
- Full Text
- View/download PDF
5. Microwave-assisted synthesis of carbon dots modified graphene for full carbon-based potassium ion capacitors
- Author
-
Guiling Wang, Yinyi Gao, Kai Zhu, Ke Ye, Shu Dong, Jun Yan, Yongzheng Fang, Dianxue Cao, and Yali Song
- Subjects
Materials science ,Graphene ,Potassium ,chemistry.chemical_element ,Potassium-ion battery ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Ascorbic acid ,01 natural sciences ,Energy storage ,0104 chemical sciences ,law.invention ,Capacitor ,chemistry ,Chemical engineering ,law ,Electrode ,General Materials Science ,0210 nano-technology ,Carbon - Abstract
Potassium ion batteries or capacitors are a promising technology for large-scale energy storage due to the abundant resource and low cost of potassium. However, the development of stable electrode materials with high capacity, capable rate ability, and excellent cycling stability remains a challenge. Herein, carbon dots modified reduced graphene oxides (LAP-rGO-CDs) are designed and synthesized via a rapid and green microwave-assisted method with l -Ascorbic acid 6-palmitate (LAP) as the reducing agent. LAP-rGO-CDs present enlarged interlayer spacing and faster ion transfer rate owing to the introducing of carbon dots. Serving as a potassium ion battery electrode, LAP-rGO-CDs showed a high specific capacity of 299 mAh g−1 at 1 A g−1 and excellent cycling stability. Moreover, a LAP-rGO-CDs//AC full carbon-based potassium ion capacitor is assembled and displays a maximum energy density of 119 Wh kg−1 and a power density of 5352 W kg−1. This work demonstrates the potential application of LAP-rGO-CDs for high-performance potassium ion storage.
- Published
- 2021
- Full Text
- View/download PDF
6. Copper niobate nanowires immobilized on reduced graphene oxide nanosheets as rate capability anode for lithium ion capacitor
- Author
-
Guiling Wang, Jun Yan, Xu Zhang, Yinyi Gao, Ke Ye, Huipeng Li, Kai Zhu, Henan Zhang, Dianxue Cao, and Kui Cheng
- Subjects
Materials science ,Graphene ,Lithium niobate ,Oxide ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,law.invention ,Anode ,Biomaterials ,chemistry.chemical_compound ,Colloid and Surface Chemistry ,chemistry ,Chemical engineering ,law ,Lithium-ion capacitor ,Lithium ,Niobium pentoxide ,0210 nano-technology ,Nanosheet - Abstract
Binary metal niobium oxides can offer a higher specific capacity compared to niobium pentoxide (Nb2O5) and thus are ideal anode candidates for lithium ion capacitors (LICs). However, their lower electronic conductivity limits their ability to achieve high energy and power densities. In this paper, one-dimensional (1D) copper niobate (CuNb2O6) nanowires are successfully prepared by electrospinning technology and then immobilized on two-dimensional (2D) reduced graphene oxide (rGO) nanosheets to form a unique 1D nanowire/2D nanosheet CuNb2O6/rGO structure. The 1D/2D CuNb2O6/rGO electrode exhibits a high specific capacity of 312.2 mAh g−1 at 100 mA g−1 as the anode of LICs. The proposed Li+ storage mechanism of the CuNb2O6 anode involves CuNb2O6 decomposition into lithium niobate (Li3NbO4) and copper (Cu) during the initial lithium insertion process. The intercalation-type Li3NbO4 will further serve as the host to Li+ and the inactive Cu phase will act as a conductive network for electron transportation. Furthermore, the energy density of the assembled CuNb2O6/rGO//activated carbon (CuNb2O6/rGO//AC) device could achieve a value as high as 92.1 Wh kg−1 and could thus be considered as a possible alternative electrode material for high energy and power LICs.
- Published
- 2021
- Full Text
- View/download PDF
7. Hollow bimetallic selenide derived from a hierarchical MOF-based Prussian blue analogue for urea electrolysis
- Author
-
Jinling Yin, Huizhu Xu, Yinyi Gao, Jun Yan, Guiling Wang, Dianxue Cao, Ke Ye, and Kai Zhu
- Subjects
Prussian blue ,Electrolysis ,Materials science ,Redox ,Anode ,Catalysis ,law.invention ,Inorganic Chemistry ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,law ,Selenide ,Water splitting ,Bimetallic strip - Abstract
Because of its low thermodynamic voltage (0.37 V), the urea oxidation reaction (UOR) is an ideal method to replace the OER, accelerate the anodic oxidation reaction and reduce the energy consumption of overall water splitting. In this work, bimetallic selenide with a hollow nanocube structure exhibits remarkable catalyst activity towards the UOR. A hierarchical MOF-based Prussian blue analogue (PBA) is constructed by growing Ni–Co PBA on an MOF–Ni template. By controlling the reaction time and temperature, the Ni–Co Prussian blue analogue (denoted as PBA@MOF–Ni) has the morphology of nanocubes evenly growing on flower-like MOF–Ni. After the selenide reaction by a solvothermal method, PBA@MOF–Ni is converted to Co–Ni/Se (denoted as PBA@MOF–Ni/Se), which has a structure with hollow nanocubes and maintains the shape of a flower. This hierarchical MOF-based PBA selenide exhibits good catalytic activity due to the addition of MOFs and the synergistic effect of bimetals. PBA@MOF–Ni/Se can be used as both a cathode and an anode in urea electrolysis. In particular for the UOR, the performance of PBA@MOF–Ni/Se is much better than that for the OER. In the performance comparison between urea electrolysis and water splitting, PBA@MOF–Ni/Se∥PBA@MOF–Ni/Se only needs 1.49 V to reach 10 mA cm−2, which is much lower than the voltage required for water splitting.
- Published
- 2021
- Full Text
- View/download PDF
8. A Nucleophilic Chemical Probe Targeting Electrophilic Functional Groups in an Untargeted Way to Explore Cysteine Modulators in Natural Products
- Author
-
Yinyi Gao, Kaili Li, Lijun Zhang, Chu Chen, and Chuan Bai
- Subjects
Biological Products ,Molecular Medicine ,Proteins ,General Medicine ,Cysteine ,Biochemistry - Abstract
The vital roles of biologically relevant cysteines have been discovered from proteins that are promising targets for new drugs or chemical tools. Therefore, new electrophilic small molecules that can covalently modulate these cysteines have attracted immense interest. Because of their extremely wide chemical diversity, electrophilic natural products (NPs) have been studied as promising sources of cysteine modulators. Previous studies have developed chemical probes to facilitate the detection and isolation of electrophilic NPs. To address the problems with the current methods, including their low sensitivity, high false-positive rate, and dependence on performing manual processing with a plethora of spectra, we report a chemical probe that can first covalently capture electrophilic NPs from natural resources and then produce sensitive reporter ion signals that are specific for the detected NPs. We applied this untargeted method to explore electrophilic NPs from natural resources and found that the complexity of electrophilic NPs was beyond our expectations. We used this chemical probe to identify a new electrophilic furanosesterterpene (
- Published
- 2022
9. An Environment‐Friendly High‐Performance Aqueous <scp>Mg‐Na</scp> Hybrid‐Ion Battery Using an Organic Polymer Anode
- Author
-
Shengnan Zhang, Chunlin Zhao, Kai Zhu, Jiaqi Zhao, Yinyi Gao, Ke Ye, Jun Yan, Guiling Wang, and Dianxue Cao
- Subjects
Renewable Energy, Sustainability and the Environment ,General Materials Science ,Environmental Science (miscellaneous) ,Waste Management and Disposal ,Energy (miscellaneous) ,Water Science and Technology - Published
- 2022
- Full Text
- View/download PDF
10. Rational design of Co-S-P nanosheet arrays as bifunctional electrocatalysts for both ethanol oxidation reaction and hydrogen evolution reaction
- Author
-
Guiling Wang, Dianxue Cao, Yinyi Gao, Linna Sha, Kai Zhu, Shuang Sheng, Jun Yan, and Ke Ye
- Subjects
Inorganic Chemistry ,chemistry.chemical_compound ,Chemical engineering ,Electrolysis of water ,Chemistry ,Oxygen evolution ,Water splitting ,Electrolyte ,Bifunctional ,Redox ,Catalysis ,Nanosheet - Abstract
Highly active, ultra-long duration and cost-effective catalysts are imminently required for the development of electrolytic appliances for H2 generation. Herein, we propose a novel and facile strategy to fabricate P doped CoS2 nanosheet arrays on carbon cloth (Co-S-P/CC) as bifunctional electrocatalysts toward hybrid water electrolysis, in which the tardy anodic oxygen evolution reaction (OER) is substituted by a more favorable kinetic and thermodynamic ethanol oxidation reaction (EOR). Benefitting from the abundant active sites of Co-S-P nanosheets and the robust adhesion between Co-S-P and CC, the binder-free self-supported bifunctional Co-S-P/CC electrodes have satisfactory electrocatalytic activities and stabilities toward the EOR and hydrogen evolution reaction (HER). Notably, owing to the more favorable kinetics and thermodynamics of the EOR compared to those of the OER catalyzed by the Co-S-P/CC electrode, the required cell voltage for hybrid water electrolysis (1.63 V) is remarkably decreased compared to water electrolysis (1.77 V). Furthermore, the oxidation product acetic acid is more valuable than raw ethanol or oxygen from water splitting alone. This work may broaden the horizons in exploring and designing novel electrocatalysts, which can integrate the HER with other small organic molecule oxidation reactions for multifarious energy-related applications.
- Published
- 2020
- Full Text
- View/download PDF
11. A comparison of the electrochemical performance of graphitized coal prepared by high-temperature heating and flash Joule heating as an anode material for lithium and potassium ion batteries
- Author
-
A.M.A. Mohamed, Shu Dong, Maged Elhefnawey, Guangsheng Dong, Yinyi Gao, Kai Zhu, and Dianxue Cao
- Subjects
General Physics and Astronomy ,Physical and Theoretical Chemistry - Published
- 2023
- Full Text
- View/download PDF
12. Polydopamine‐Modified Reduced Graphene Oxides as a Capable Electrode for High‐Performance Supercapacitor
- Author
-
Kui Cheng, Ke Ye, Jun Yan, Yongzheng Fang, Guiling Wang, Dianxue Cao, Xie Zeyu, Kai Zhu, Shu Dong, and Yinyi Gao
- Subjects
Supercapacitor ,Materials science ,Graphene ,law ,Electrode ,Nanotechnology ,General Chemistry ,law.invention - Published
- 2019
- Full Text
- View/download PDF
13. Simultaneously boosting hydrogen production and ethanol upgrading using a highly-efficient hollow needle-like copper cobalt sulfide as a bifunctional electrocatalyst
- Author
-
Yinyi Gao, Dianxue Cao, Shuang Sheng, Ke Ye, Jun Yan, Kai Zhu, and Guiling Wang
- Subjects
Materials science ,Hydrogen ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,Electrocatalyst ,01 natural sciences ,Catalysis ,Biomaterials ,chemistry.chemical_compound ,Colloid and Surface Chemistry ,Bifunctional ,Hydrogen production ,Ethanol ,Oxygen evolution ,Cobalt ,021001 nanoscience & nanotechnology ,Cobalt sulfide ,Carbon ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,chemistry ,Chemical engineering ,Water splitting ,0210 nano-technology ,Copper - Abstract
Electrocatalytic water splitting used for generating clean and sustainable hydrogen (H2) can be very promising to address current energy shortage and associated environmental issues. However, this methodology is severely impeded by the tardy oxygen evolution reaction (OER). Hence, designing a preferable kinetics and thermodynamics oxidation reaction that supersede OER is very significant for the energy-saving production of H2. Herein, hollow needle-like copper cobalt sulfide was constructed on carbon cloth (CuCo2S4/CC) as a bifunctional electrocatalyst to accelerate H2 generation and simultaneously convert ethanol into value-added acetic acid. Thanks to the synergistic effect and unique structure of Cu and Co, CuCo2S4/CC displays superior catalytic activity and durability in ethanol oxidation reaction (EOR) with a low potential of 1.38 V vs. RHE (@10 mA cm−2). Meanwhile, it exhibits excellent hydrogen evolution reaction (HER) performance. The homemade CuCo2S4/CC//CuCo2S4/CC ethanol–water electrolyser only demands a voltage of 1.59 V to deliver 10 mA cm−2, 150 mV less than that used for ordinary water splitting. This shows that the ethanol–water electrolyser elaborated here holds encouraging potential in the energy-saving production of H2 and oxidation of ethanol into value-added acetic acid. This present work may open the way for the rational design of other electrocatalysts for efficient biomass oxidation reaction and relevant H2 production applications.
- Published
- 2021
14. Facile fabrication of F-doped biomass carbon as high-performance anode material for potassium-ion batteries
- Author
-
Guiling Wang, Yinyi Gao, Pengfei Wang, Ke Ye, Jun Yan, Kai Zhu, Dianxue Cao, Rong Hu, Dong Wang, and Zhe Gong
- Subjects
Materials science ,General Chemical Engineering ,Heteroatom ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,01 natural sciences ,0104 chemical sciences ,Anode ,Trifluoride ,chemistry.chemical_compound ,Adsorption ,Hydrofluoric acid ,chemistry ,Chemical engineering ,Electrode ,0210 nano-technology ,Carbon - Abstract
Heteroatom doping can effectively improve the electrochemical activity of carbon materials. In this paper, three kinds of fluorine-doped biomass carbon are synthesized using industrial hemp core as the precursor and Poly tetra fluoroethylene (PTFE), Diethylaminosulphur trifluoride (DAST) and Hydrofluoric acid (HF) as fluorinating agents, respectively. Among them, the PTFE-treated biomass carbon (PTFE-CHEMP) is wrapped by fluorine-containing nanotubes, which has the most defects, the most F doping amount and the optimum pore size, and is beneficial to the adsorption of K+. When used as the anode of potassium ion batteries (PIBs), the PTFE-CHEMP electrode can provide an average reversible capacity of 369.6 mAh g−1 (200 mA g−1) in 500 cycles. Even at a high current of 2000 mA g−1, it can still provide an excellent rate capability of 229.3 mAh g−1. Kinetic analysis verify that its excellent rate performance comes from the K+ storage mechanism dominated by surface-driven behavior. In addition, the constant current intermittent titration technique (GITT) shows that it still has the storage capacity for K+ at high potentials. This work not only provides a reference for subsequent research on fluorine-doped biomass carbon, but also provides a potential solution for the production of low-cost, high-capacity PIBs anodes.
- Published
- 2021
- Full Text
- View/download PDF
15. N-rich biomass carbon derived from hemp as a full carbon-based potassium ion hybrid capacitor anode
- Author
-
Jun Yan, Kai Zhu, Dianxue Cao, Yinyi Gao, Guiling Wang, Ke Ye, Pengfei Wang, and Zhe Gong
- Subjects
Materials science ,Potassium ,General Physics and Astronomy ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Capacitance ,law.invention ,law ,medicine ,Potassium-ion battery ,Surfaces and Interfaces ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Cathode ,0104 chemical sciences ,Surfaces, Coatings and Films ,Anode ,chemistry ,Chemical engineering ,Lithium ,0210 nano-technology ,Carbon ,Activated carbon ,medicine.drug - Abstract
Potassium ion hybrid capacitors have the advantages of high energy density, high power density, and low cost, and are expected to replace expensive lithium ion storage devices in large-scale applications. Here, an innovative nitrogen-rich biomass carbon (N-CHC) is prepared using urea as the etchant and hemp core as the raw material, which has a high specific surface area of 1185.3 m2 g−1 and nitrogen content of 8.56%. In addition, it shows a capacity of 442.4 mAh g−1 as a potassium ion half-cell anode at 30 mA g−1. Even under the high current test of 2000 mA g−1, N-CHC also shows excellent performance (175.0 mAh g−1). Further, the good rate performance is attributed to the large-scale capacitance control by analyzing reaction process kinetics. And the constant current intermittent titration technique (GITT) results show that N-CHC has a larger K+ diffusion coefficient than unetched biomass carbon. The maximum energy density of the full carbon-based hybrid capacitor composed of N-CHC anode and activated carbon cathode is 127.36 Wh kg−1, and the maximum power density is 2371 W kg−1.
- Published
- 2021
- Full Text
- View/download PDF
16. Facile electrodepositing processed of RuO2-graphene nanosheets-CNT composites as a binder-free electrode for electrochemical supercapacitors
- Author
-
Ke Ye, Dianxue Cao, Tian Ouyang, Shuying Kong, Guiling Wang, Yinyi Gao, and Kui Cheng
- Subjects
Supercapacitor ,Nanostructure ,Materials science ,Graphene ,General Chemical Engineering ,Nanoparticle ,02 engineering and technology ,Carbon nanotube ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Capacitance ,0104 chemical sciences ,law.invention ,Electrophoretic deposition ,law ,Electrode ,Electrochemistry ,Composite material ,0210 nano-technology - Abstract
A unique nanostructure electrode consisting of RuO 2 nanoparticles with ultra-fine diameter (1.9 nm) anchored on the surface of graphene nanosheets (GNS) and carbon nanotube (CNT) is prepared as a binder-free supercapacitor electrode through two-step electrochemical routes. At first, free-standing GNS and CNT (GC) are directly deposited on the surface of carbon fiber cloth (CFC) to form a cross-linked composite via a cathodic electrophoretic deposition method. Safranin, a kind of cationic organic dye, is introduced in this stage as a new-type dispersant to disperse GNS and CNT in water to form a suspension solution. After the following electro-deposition process, the as-prepared GC composite is uniform covered with RuO 2 nanoparticles. Benefiting from the combined advantages of GNS, CNT and ultra-fine RuO 2 nanoparticles in such a binder-free structure, the hybrid electrode exhibits a high specific capacitance up to 480.3 F g −1 (based on the total mass of GNS, CNT and RuO 2 ) and remarkable cycling stability (89.4% capacitance retention after 10000 cycles). Furthermore, the assembled symmetric supercapacitor exhibits a high energy density of 30.9 Wh kg −1 and power density of 14000 W kg −1 with excellent stability performance (92.7% capacitance retention after 10000 cycles). Thus, the remarkable performance of the resultant RuO 2 electrode has provided a rational design strategy for developing supercapacitors with high energy density.
- Published
- 2017
- Full Text
- View/download PDF
17. Facile dip coating processed 3D MnO2-graphene nanosheets/MWNT-Ni foam composites for electrochemical supercapacitors
- Author
-
Yinyi Gao, Tian Ouyang, Guiling Wang, Kui Cheng, Ke Ye, Dianxue Cao, and Shuying Kong
- Subjects
Supercapacitor ,Materials science ,Graphene ,General Chemical Engineering ,02 engineering and technology ,Substrate (electronics) ,Carbon nanotube ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Capacitance ,Dip-coating ,0104 chemical sciences ,law.invention ,law ,Specific surface area ,Electrode ,Electrochemistry ,Composite material ,0210 nano-technology - Abstract
Carbon materials, especially graphene nanosheets (GNS) and/or multi-walled carbon nanotube (MWNT), have been widely used as electrode materials for supercapacitor due to their advantages of higher specific surface area and electronic conductivity, but the relatively low specific capacitance thus results in low energy density hindering their large applications. On the contrary, MnO2 exhibits higher energy density but poor electrical conductivity. In order to obtain high performance supercapacitor electrode, here, combining the advantages of these materials, we have designed a facile two-step strategy to prepare 3D MnO2-GNS-MWNT-Ni foam (MnO2-GM-Ni) electrode. First, GNS and MWNT is wrapped on the surface of Ni foam (GM-Ni) via a “dip & dry” method by using an organic dye as a co-dispersant. Then, by using this 3D GM-Ni as substrate, MnO2 nanoflakes are in-situ supporting on the surface of GNS and MWNT through a hydrothermal reaction. The specific capacitances of MnO2-GM-Ni electrode reach as high as 470.5 F g−1 at 1 A g−1. Furthermore, we have successfully fabricated an asymmetric supercapacitor with MnO2-GM-Ni and GM-Ni as the positive and negative electrodes, respectively. The MnO2-GM-Ni//GM-Ni asymmetric supercapacitor exhibits a maximum energy density of 35.3 Wh kg−1 at a power density of 426 W kg−1 and also a favorable cycling performance that 83.8% capacitance retention after 5000 cycles. These results show manageable and high-performance which offer promising future for practical applications.
- Published
- 2017
- Full Text
- View/download PDF
18. Pd nanoparticles support on rGO-C@TiC coaxial nanowires as a novel 3D electrode for NaBH4 electrooxidation
- Author
-
Guiling Wang, Jietao Jiang, Ke Ye, Shuying Kong, Dianxue Cao, Wenping Zhang, Yinyi Gao, and Kui Cheng
- Subjects
Materials science ,Working electrode ,Renewable Energy, Sustainability and the Environment ,Graphene ,Analytical chemistry ,Energy Engineering and Power Technology ,02 engineering and technology ,Chemical vapor deposition ,Chronoamperometry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,Anode ,law.invention ,Fuel Technology ,Chemical engineering ,law ,Direct borohydride fuel cell ,Electrode ,0210 nano-technology ,Voltammetry - Abstract
Recently, direct borohydride fuel cell (DBFC) has been considering as a promising energy conversion devices. During the development of DBFC, reducing the use of noble metals and increasing the anode performance are the hot topic in recent researches. In this article, reduced graphene oxide nanosheets deposit on C@TiC coaxial nanowire array (rGO-C@TiC) by means of a combine method of chemical vapor deposition and electrodeposition is chosen as 3D current collector for Pd nanoparticles deposition. The morphology and crystal structure of the as-obtained 3D electrode is checked with FESEM, TEM, EDS, and XRD. Results claim that the as-prepared 3D electrode exhibits a mushroom-like structure with the mean diameter size of Pd is 5.32 nm. Their catalytic ability for NaBH4 electro-oxidation is evaluated in a three electrode system by using the method of cycle voltammetry and chronoamperometry, proving that the 3D Pd-rGO-C@TiC electrode has a higher catalytic performance. The oxidation current density of 1.35 A cm−2 mg−1Pd is achieved at −0.6 V. Furthermore, a direct borohydride-hydrogen peroxide fuel cell (DBHPFC) is assembled by using the as-prepared Pd-rGO-C@TiC electrode and a Pd/CFC electrode as anode and cathode catalyst, respectively, and a maximum power density of 68.5 mW cm−2 is obtained. In addition, the assembled DBHPFC shows excellent higher performance based on the mass activity basis (1427.1 W g−1) among those reported literatures, indicating that our Pd-rGO-C@TiC could be acted as a promising cost-effective and ponderable alternative catalyst for NaBH4 electrooxidation.
- Published
- 2017
- Full Text
- View/download PDF
19. Silicon Nanoparticles Embedded in N-Doped Few-Layered Graphene: Facile Synthesis and Application as an Effective Anode for Lithium Ion Batteries
- Author
-
Guiling Wang, Kai Zhu, Ke Ye, Yuting Luan, Shuangxi Shao, Jun Yan, Kui Cheng, Yinyi Gao, Dianxue Cao, and Bowen Yang
- Subjects
Materials science ,Graphene ,chemistry.chemical_element ,Nanoparticle ,General Chemistry ,Cathode ,law.invention ,Anode ,Electric arc ,chemistry ,Chemical engineering ,law ,Lithium ,Graphite ,Faraday efficiency - Abstract
A fast one-step arc discharge exfoliation method is employed to synthesize Si/graphene composites by using a graphite rod filled with a mixture of Si powder and urea as a cathode. During the arc discharge process, the use of urea allows both the introduction of nitrogen atoms into the graphene and the uniform sealing of Si nanoparticles between the thin graphene sheets to occur simultaneously. The resulting N-doped graphene nanosheets embedded with Si (Si@NG) can act as an electrode material for lithium-ion batteries and delivers the reversible capacity of 1030 mAh g-1 with a current density of 200 mA g-1 over 100 cycles along with an outstanding coulombic efficiency of 96.84 %. The remarkable electrochemical rate capability performance can be owed to the multiple role of NG, which not only serves as a three-dimensional conductive support, but also effectively limits the volume variation of Si nanoparticles. The approach proposed here is expected to be extended to the preparation of other alloy anode/graphene hybrids for lithium ion batteries.
- Published
- 2019
20. Sulfur-doped biomass carbon as anode for high temperature potassium ion full cells
- Author
-
Guiling Wang, Ke Ye, Jun Yan, Kai Zhu, Zhe Gong, Dianxue Cao, Yinyi Gao, and Pengfei Wang
- Subjects
Materials science ,General Chemical Engineering ,Potassium ,Biomass ,chemistry.chemical_element ,02 engineering and technology ,Electrolyte ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,01 natural sciences ,Sulfur ,Cathode ,0104 chemical sciences ,Anode ,law.invention ,chemistry ,Chemical engineering ,law ,Desorption ,0210 nano-technology - Abstract
Potassium-ion batteries (PIBs) have huge advantages in terms of price and resource abundance, and are ideal substitutes for lithium-ion batteries (LIBs), but there is currently little research on their high-temperature fields. In this work, the sulfur-doped biomass carbon (CHP/S) is synthesized from biomass hemp stalks as the carbon source and sulfur powder as the sulfur source, with a high sulfur content of 18.6%. Sulfur mainly exist in the form of bonded sulfur (S-C, S-O) and have quite favorable stability. As a PIBs anode, it exhibits a specific capacity of 589 mAh g−1 (30 mA g−1) at 60 °C, which is 1.5 times the capacity at 25 °C. Electrochemical analysis and kinetic analysis indicate that the increased capacity mainly comes from the “arousal effect” of sulfur under high temperature conditions, and an increased temperature has a positive effect on the absorption and desorption performance of the material. In addition, the full cell assembled with Perylene-3, 4, 9, 10-tetracarboxylic dianhydride (PTCDA) cathode shows greater capacity (~80 mAh g−1) at 60 °C than at 25 °C. Unfortunately, the electrolyte decomposition problem caused by high temperature is easily dangerous. The result is of great significance to the research of high-temperature PIBs.
- Published
- 2021
- Full Text
- View/download PDF
21. Synthesis and electrochemical performance of LiVO3 anode materials for full vanadium-based lithium-ion batteries
- Author
-
Guiling Wang, Yinyi Gao, Jinling Yin, Man Zhang, Boya Liu, Dianxue Cao, Kai Zhu, Shuangxi Shao, Jun Yan, and Ke Ye
- Subjects
Materials science ,Renewable Energy, Sustainability and the Environment ,020209 energy ,Energy Engineering and Power Technology ,chemistry.chemical_element ,Vanadium ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Combustion ,Electrochemistry ,Cathode ,Anode ,law.invention ,Ion ,chemistry ,Chemical engineering ,law ,0202 electrical engineering, electronic engineering, information engineering ,Lithium ,Electrical and Electronic Engineering ,0210 nano-technology ,Voltage - Abstract
LiVO3 is prepared by the combustion method and applied as anode material for rechargeable lithium-ion batteries. The LiVO3 electrode material shows excellent electrochemical performance in the voltage window of 0.2-3V. It displays a high specific capacity and capable capacity retention. Moreover, a full vanadium-based cell is designed based on the LiVO3 anode and Li3V2(PO4)3 cathode. The full cell presents a stable cycling performance and good rate ability. This work suggests a potential vanadium-based anode material and the possibility of the full vanadium-based cell.
- Published
- 2021
- Full Text
- View/download PDF
22. Preparation of three-dimensional porous Cu film supported on Cu foam and its electrocatalytic performance for hydrazine electrooxidation in alkaline medium
- Author
-
Ran Liu, Ziyao Long, Guiling Wang, Kui Cheng, Ke Ye, Dianxue Cao, Wenping Zhang, and Yinyi Gao
- Subjects
Materials science ,Mechanical Engineering ,Inorganic chemistry ,Hydrazine ,chemistry.chemical_element ,02 engineering and technology ,Electrolyte ,Chronoamperometry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Electrocatalyst ,01 natural sciences ,Copper ,0104 chemical sciences ,Dielectric spectroscopy ,chemistry.chemical_compound ,chemistry ,Mechanics of Materials ,Linear sweep voltammetry ,Electrode ,General Materials Science ,0210 nano-technology - Abstract
A three-dimensional porous copper film is directly deposited on Cu foam by an electrodeposition method using hydrogen bubbles as dynamic template (denoted as Cu/Cu foam). Its electrocatalytic activity toward hydrazine electrooxidation is tested by linear sweep voltammetry, chronoamperometry and electrochemical impedance spectroscopy. Compared with Cu foam, hydrazine electrooxidation on the Cu/Cu foam electrode shows that the onset oxidation potential displays a ~100 mV negative shift, the current density at −0.6 V raises about 14 times, the apparent activation energy and the charge transfer resistance reduce significantly. The increasing electrocatalytic performance for hydrazine electrooxidation is mainly caused by the highly porous structure of the Cu/Cu foam electrode which can provide a large surface area and make electrolyte access the electrocatalyst surfaces more easily. Hydrazine electrooxidation on the Cu/Cu foam electrode proceeds through a near 4-electron process.
- Published
- 2016
- Full Text
- View/download PDF
23. Enhancement of direct urea-hydrogen peroxide fuel cell performance by three-dimensional porous nickel-cobalt anode
- Author
-
Fen Guo, Yinyi Gao, Guiling Wang, Dianxue Cao, Mengmeng Du, Ke Ye, Wenping Zhang, and Kui Cheng
- Subjects
Materials science ,Renewable Energy, Sustainability and the Environment ,Open-circuit voltage ,Inorganic chemistry ,Energy Engineering and Power Technology ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Direct-ethanol fuel cell ,01 natural sciences ,Peroxide ,0104 chemical sciences ,Anode ,chemistry.chemical_compound ,Nickel ,chemistry ,Urea ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,0210 nano-technology ,Cobalt ,Power density - Abstract
A novel three-dimensional (3D) porous nickel-cobalt (Ni-Co) film on nickel foam is successfully prepared and further used as an efficient anode for direct urea-hydrogen peroxide fuel cell (DUHPFC). By varying the cobalt/nickel mole ratios into 0%, 20%, 50%, 80% and 100%, the optimized Ni-Co/Ni foam anode with a ratio of 80% is obtained in terms of the best cell performance among five anodes. Effects of the KOH and urea concentrations, the flow rate and operation temperature on the fuel cell performance are investigated. Results show DUHPFC with the 3D Ni-Co/Ni foam anode exhibits a higher performance than those reported direct urea fuel cells. The cell gives an open circuit voltage of 0.83 V and a peak power density as high as 17.4 and 31.5 mW cm−2 at 20 °C and 70 °C, respectively, when operating on 7.0 mol L−1 KOH and 0.5 mol L−1 urea as the fuel at a flow rate of 15 mL min−1. Besides, when the human urine is directly fed as the fuel, direct urine-hydrogen peroxide fuel cell reaches a maximum power density of 7.5 mW cm−2 with an open circuit voltage of 0.80 V at 20 °C, showing a good application prospect in wastewater treatment.
- Published
- 2016
- Full Text
- View/download PDF
24. Preparation of porous palladium nanowire arrays and their catalytic performance for hydrogen peroxide electroreduction in acid medium
- Author
-
Guiling Wang, Xue Xiao, Ke Ye, Hongyu Zhang, Kui Cheng, Dianxue Cao, Xin Wang, and Yinyi Gao
- Subjects
Materials science ,Renewable Energy, Sustainability and the Environment ,Nanoporous ,Scanning electron microscope ,Inorganic chemistry ,Energy Engineering and Power Technology ,chemistry.chemical_element ,02 engineering and technology ,Chronoamperometry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Dielectric spectroscopy ,Catalysis ,chemistry ,Linear sweep voltammetry ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,Cyclic voltammetry ,0210 nano-technology ,Palladium - Abstract
Nanoporous palladium supported on the carbon coated titanium carbide (C@TiC) nanowire arrays (Pd NP/C@TiC) are successfully prepared by a facile chemical vapor deposition of three-dimensional (3D) C@TiC substrate, followed by electrochemical codeposition of Pd–Ni and removal of Ni via dealloying. The structure and morphology of the obtained Pd NP/C@TiC electrodes are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). Cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) are used to examine the catalytic performances of the electrodes for H2O2 electroreduction in H2SO4 solution. The Pd NP/C@TiC electrode exhibits a largely effective specific surface area owing to its open nanoporous structure allowing the full utilization of Pd surface active sites. At the potential of 0.2 V in 2.0 mol L−1 H2O2 and 2 mol L−1 H2SO4 solutions, the reduction current density reaches 3.47 A mg−1, which is significantly higher than the catalytic activity of H2O2 electroreduction achieved previously with precious metals as catalysts.
- Published
- 2016
- Full Text
- View/download PDF
25. Molten salt synthesis of nitrogen doped porous carbon: a new preparation methodology for high-volumetric capacitance electrode materials
- Author
-
Dianxue Cao, Guiling Wang, Shuying Kong, Yinyi Gao, Kui Cheng, Ke Ye, and Tian Ouyang
- Subjects
Supercapacitor ,Materials science ,Renewable Energy, Sustainability and the Environment ,Nanotechnology ,02 engineering and technology ,General Chemistry ,Electrolyte ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Capacitance ,Energy storage ,0104 chemical sciences ,Chemical engineering ,Specific surface area ,Gravimetric analysis ,General Materials Science ,Molten salt ,0210 nano-technology ,Current density - Abstract
To meet the ever-increasing need for high-efficiency energy storage in modern society, porous carbon materials with large surface areas are typically employed for electrical double-layer capacitors to achieve high gravimetric performances. However, their poor volumetric performances come from low packing density and/or high pore volume resulting in poor volumetric capacitance, which would limit their further applications. Here, a novel and one-step molten salt synthesis of a three-dimensional, densely nitrogen-doped porous carbon (NPC) material by using low-cost and eco-friendly tofu as the nitrogen-containing carbon source is proposed. Hierarchically porous carbon with a specific surface area of 1202 m2 g−1 and a high nitrogen content of 4.72 wt% and a bulk density of ∼0.84 g cm−3 is obtained at a carbonation temperature of 750 °C. As the electrode material for a supercapacitor, the NPC electrode shows both ultra-high specific volumetric and gravimetric capacitances of 360 F cm−3 and 418 F g−1 at 1 A g−1 (based on a three-electrode system), respectively, and excellent cycling stability without capacitance loss after 10 000 cycles at a high charge current of 10 A g−1 in KOH electrolyte. Moreover, the as-assembled symmetric supercapacitor exhibits not only an excellent cycling stability with 97% capacitance retention after 10 000 cycles, but also a high volumetric energy density up to 27.68 W h L−1 at a current density of 0.2 A g−1, making this new method highly promising for compact energy storage devices with simultaneous high volumetric/gravimetric energy and power densities.
- Published
- 2016
- Full Text
- View/download PDF
26. Rational design of N-doped carbon coated NiNb2O6 hollow nanoparticles as anode for Li-ion capacitor
- Author
-
Guiling Wang, Kai Zhu, Xu Zhang, Yinyi Gao, Dianxue Cao, Ke Ye, Henan Zhang, Jun Yan, and Kui Cheng
- Subjects
Materials science ,Intercalation (chemistry) ,General Physics and Astronomy ,chemistry.chemical_element ,Nanoparticle ,02 engineering and technology ,Surfaces and Interfaces ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Electrochemistry ,01 natural sciences ,Cathode ,0104 chemical sciences ,Surfaces, Coatings and Films ,law.invention ,Anode ,Chemical engineering ,chemistry ,law ,Lithium ,0210 nano-technology ,Current density ,Carbon - Abstract
Searching for anode materials with fast Li+ intercalation kinetics to mitigate the dynamic imbalance with the rapid capacitive cathode is the fundamental strategy to achieve high energy-power density of Li-ion capacitors (LICs). Hence, NiNb2O6 hollow nanoparticles are first synthesized by hydrothermal method and then sealed with a protective N-doped carbon shell to achieve the target NiNb2O6@NC composite. As the anode of LICs, the NiNb2O6@NC sample exhibits a high capacity of 435.8 mAh g−1 at 50 mA g−1 and excellent rate performance of 47.8% capacity retention with the current density increased to 2 A g−1. The lithium storage mechanism of NiNb2O6 is proposed as a combined conversion reaction and an intercalation reaction, which the NiNb2O6 decomposes into Ni metal and LixNb2O5 during the 1st discharge/charge process. The irreversible Ni would not contribute to the reversible capacity and will improve the electric conductivity for fast transport of electrons and the LixNb2O5 will act as the host for lithium ions by means of the intercalation mechanism. Furthermore, the assembled NiNb2O6@NC//activated carbon LICs exhibit a maximum energy density of 123.9 Wh kg−1 and the capacity retention reaches 86.1% after 5000 cycles. The superior electrochemical performances indicate that the rationally-designed NiNb2O6@NC is expected to be a potential anode material for LICs.
- Published
- 2020
- Full Text
- View/download PDF
27. The stable lithium metal cell with two-electrode biomass carbon
- Author
-
Jun Yan, Yinyi Gao, Dianxue Cao, Pengfei Wang, Zhe Gong, Ke Ye, Kai Zhu, and Guiling Wang
- Subjects
Materials science ,General Chemical Engineering ,Nucleation ,chemistry.chemical_element ,02 engineering and technology ,Electrolyte ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,01 natural sciences ,Energy storage ,0104 chemical sciences ,Anode ,Nickel ,chemistry ,Chemical engineering ,Electrode ,Lithium ,0210 nano-technology - Abstract
As a mainstream energy storage device, lithium-ion batteries have always been the focus of scientific researchers. As the most promising anode material, lithium metal has the advantages of high capacity and low reduction potential. Unfortunately, lithium dendrites can cause serious safety hazards during cycling. In this study, biomass carbon with a large number of straight holes was embedded with nickel particles as the anode framework. Nickel induces lithium to complete nucleation and growth in the pores and inhibits dendrite growth. Solid electrolyte interface (SEI) film growth, dead lithium, and electrode breakage all occur within the holes to a limited extent. Benefited from this internal reaction, the electrode obtains better electrochemical and cycling performances. The nickel-modified electrode was stably cycled for 1370 h at a current density of 5 mA/cm2 with a capacity of 2 mAh/cm2. Moreover, more massive capacity lithium storage (5 mAh/cm2) was tried, and the cycle was stable for 630 h. Using the same biomass carbon matrix, the pores were filled with sulfur powder as the positive electrode. After 100 periods of the full cell operation, the capacity retention rate is 85%.
- Published
- 2020
- Full Text
- View/download PDF
28. Three-dimensional carbon- and binder-free nickel nanowire arrays as a high-performance and low-cost anode for direct hydrogen peroxide fuel cell
- Author
-
Wang Guiling, Dongming Zhang, Wenping Zhang, Dianxue Cao, Kui Cheng, Ke Ye, Yinyi Gao, and Fen Guo
- Subjects
Materials science ,Renewable Energy, Sustainability and the Environment ,Nanowire ,Energy Engineering and Power Technology ,chemistry.chemical_element ,Nanotechnology ,Electrochemistry ,Catalysis ,Anode ,Nickel ,Chemical engineering ,chemistry ,Electrode ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,Carbon ,Power density - Abstract
A novel three-dimensional carbon- and binder-free nickel nanowire arrays (Ni NAs) electrode is successfully fabricated by a facile galvanostatic electrodeposition method using polycarbonate membrane as the template. The Ni NAs electrode achieves a oxidation current density (divided by the electroactive surface areas of Ni) of 25.1 mA cm −2 in 4 mol L −1 KOH and 0.9 mol L −1 H 2 O 2 at 0.2 V (vs. Ag/AgCl) accompanied with a desirable stability, which is significantly higher than the catalytic activity of H 2 O 2 electro-oxidation achieved previously with precious metals as catalysts. The impressive electrocatalytic performance is largely attributed to the superior 3D open structure and high electronic conductivity, which ensures the high utilization of Ni surfaces and makes the electrode have higher electrochemical activity. The apparent activation energy of H 2 O 2 electro-oxidation on the Ni NAs catalyst is 13.59 kJ mol −1 . A direct peroxide–peroxide fuel cell using the Ni NAs as anode exhibits a peak power density of 48.7 mW cm −2 at 20 °C. The electrode displays a great promise as the anode of direct peroxide–peroxide fuel cell due to its low cost, high activity and stability.
- Published
- 2015
- Full Text
- View/download PDF
29. Preparation of M1/3Ni1/3Mn2/3O2 (M=Mg or Zn) and its performance as the cathode material of aqueous divalent cations battery
- Author
-
Guiling Wang, Wenbin Zhao, Kui Cheng, Ke Ye, Yinyi Gao, Ying Zhang, and Dianxue Cao
- Subjects
Aqueous solution ,X-ray photoelectron spectroscopy ,Scanning electron microscope ,Transmission electron microscopy ,Chemistry ,General Chemical Engineering ,Inductively coupled plasma atomic emission spectroscopy ,Intercalation (chemistry) ,Electrochemistry ,Analytical chemistry ,Cyclic voltammetry ,Dielectric spectroscopy - Abstract
M1/3Ni1/3Mn2/3O2 (M = Mg or Zn) is sucessfully synthesize from Na2/3Ni1/3Mn2/3O2 via a electrochemical conversion method. The structure and morphology of the as-prepared material are systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), inductively coupled plasma atomic emission spectroscopy (ICP-AES) and X-ray photoelectron spectroscopy (XPS), respectively. The nano-sized morphology of M1/3Ni1/3Mn2/3O2 is beneficial for the reduction of diffusion length and transfer acceleration of cations from the surface into the bulk interiors. XRD patterns reveal that crystal structure is maintained after the reversible Mg2+ or Zn2+ intercalation/deintercalation. Its performance for Mg2+ and Zn2+ intercalation/deintercalation in aquesous electrolytes is evaluated by cyclic voltammetry, galvanostatic cycling and electrochemical impedance spectroscopy. Mg1/3Ni1/3Mn2/3O2 exhibits an initial capacity of 170.5 mAh g−1 in 1 mol L−1 Mg(NO3)2, Zn1/3Ni1/3Mn2/3O2 displays capacity of 113.7 mAh g−1 in 1 mol L−1 ZnSO4. Mg1/3Ni1/3Mn2/3O2 shows a good cycling performance and maintains 52.7 mAh g−1 at 1.0C after 200 cycles in 1.0 mol L−1 MgSO4.
- Published
- 2015
- Full Text
- View/download PDF
30. Freestanding one-dimensional manganese dioxide nanoflakes-titanium cabide/carbon core/double shell arrays as ultra-high performance supercapacitor electrode
- Author
-
Dianxue Cao, Yinyi Gao, Kui Cheng, Guiling Wang, Shuying Kong, Tian Ouyang, and Ke Ye
- Subjects
Supercapacitor ,Materials science ,Renewable Energy, Sustainability and the Environment ,Scanning electron microscope ,Nanowire ,Energy Engineering and Power Technology ,Nanotechnology ,Dielectric spectroscopy ,symbols.namesake ,Chemical engineering ,X-ray photoelectron spectroscopy ,Electrode ,symbols ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,Raman spectroscopy ,Diffractometer - Abstract
In this paper, freestanding one-dimensional MnO 2 nanoflakes are successful prepared through a simple hydrothermal reaction by using the carbon shell of TiC/C core/shell arrays as the sacrificial template. Its structure and morphology are characterized by X-ray diffractometer, X-ray photoelectron spectroscopy, Raman spectroscopy, scanning electron microscopy, energy dispersive X-ray spectrometer and transmission electron microscopy. Results show that the thickness of the carbon shell decreased but also remained and the ultrathin MnO 2 nanoflakes with thickness less than 5 nm uniformly grow on the surfaces of the TiC/C nanowire to form a core/double shell structure after the hydrothermal reaction. The electrochemical performance of the as-prepared electrode is evaluated by cyclic voltammetrys, galvanostatic charging-discharging tests and electrochemical impedance spectroscopy, and high capacities, excellent rate capabilities and exemplary cycling performance is obtained. The as-prepared electrode shows a high specific capacitance of 598.8 F g −1 and 85.8% of its initial capacitance is retained after 10,000 cycles at a high discharge current density of 10 A g −1 , suggesting that this structure has a promising future as high-performance supercapacitor electrode.
- Published
- 2015
- Full Text
- View/download PDF
31. Palladium dispersed in three-dimensional polyaniline networks as the catalyst for hydrogen peroxide electro-reduction in an acidic medium
- Author
-
Guiling Wang, Yinyi Gao, Fen Guo, Dianxue Cao, Ke Ye, Kui Cheng, and Xiaomei Huang
- Subjects
Materials science ,Polyaniline nanofibers ,General Chemical Engineering ,Inorganic chemistry ,chemistry.chemical_element ,General Chemistry ,Chronoamperometry ,Dielectric spectroscopy ,chemistry.chemical_compound ,chemistry ,Polyaniline ,Linear sweep voltammetry ,Fourier transform infrared spectroscopy ,Cyclic voltammetry ,Nuclear chemistry ,Palladium - Abstract
A novel Pd/polyaniline/CFC electrode is prepared by electroless deposition of palladium (Pd) onto three-dimensional polyaniline networks. The polyaniline matrix on the carbon fiber cloth (CFC) in the reduction state is electro-synthesized by cyclic voltammetry and has a lower vertex potential of −0.4 V vs. Ag/AgCl. The particle size of the Pd coated on the polyaniline chains is gradiently distributed. The as-prepared Pd/polyaniline/CFC electrode is characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FITR) and X-ray diffraction (XRD). The hydrogen peroxide (H2O2) electro-reduction reaction in H2SO4 solutions on the Pd/polyaniline/CFC electrode is investigated using cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS). The results reveal that the electrode exhibited high catalytic activity and excellent stability in the strong oxidizing solution of H2O2 and H2SO4. Polyaniline itself shows electro-catalytic activity towards H2O2 to some extent involving the chemical–electrochemical (C–E) coupling mechanism.
- Published
- 2015
- Full Text
- View/download PDF
32. Facile synthesis of Co3O4 with different morphology and their application in supercapacitors
- Author
-
Shuying Kong, Guiling Wang, Dianxue Cao, Yinyi Gao, Dingfu Zhang, Ke Ye, Kui Cheng, and Tian Ouyang
- Subjects
Supercapacitor ,Materials science ,Surface-area-to-volume ratio ,Scanning electron microscope ,General Chemical Engineering ,Pseudocapacitor ,Analytical chemistry ,Hydrothermal synthesis ,General Chemistry ,Electrolyte ,Cyclic voltammetry ,Fourier transform infrared spectroscopy - Abstract
In this article, direct growth of Co3O4 with different morphologies on nickel foam is successfully achieved via a simple hydrothermal method by changing the volume ratio between ethanol and water. The morphology and structure of the as-prepared samples are examined by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy. The electrochemical performance of the Co3O4 electrodes is investigated as pseudocapacitor material by cyclic voltammetry and galvanostatic charge/discharge test in 3 mol L−1 KOH solution. Results show that the solvent composition plays an important role not only in the morphology but also in the capacitance. Co3O4 with a honeycomb structure obtained from the volume ratio of C2H5OH/H2O = 1 exhibits the highest capacitive performance, 2509.4 F g−1 at 1 A g−1 and 1754 F g−1 at 10 A g−1, which is much larger than that prepared in the pure water and pure ethanol solvent. The electrode also has a satisfactory cycling performance with capacity retention of 74% after 1000 cycles at 10 A g−1. The enhanced electrochemical performance is ascribed to the honeycomb nanostructure allowing facile electrolyte flow which speeds up electrochemical reaction kinetics. These findings may open up the opportunity for optimizing the hydrothermal synthesis conditions to control the morphology and performance of the products.
- Published
- 2015
- Full Text
- View/download PDF
33. Electrolytic extraction of dysprosium and thermodynamic evaluation of Cu-Dy intermetallic compound in eutectic LiCl-KCl
- Author
-
Wei Han, Mei Li, Yinyi Gao, Zhuyao Li, Xiaoguang Yang, Yang Sun, and Milin Zhang
- Subjects
Electrolysis ,Materials science ,General Chemical Engineering ,Analytical chemistry ,Intermetallic ,Exchange current density ,chemistry.chemical_element ,02 engineering and technology ,General Chemistry ,Atmospheric temperature range ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,01 natural sciences ,0104 chemical sciences ,law.invention ,chemistry ,law ,Electrode ,Dysprosium ,0210 nano-technology ,Eutectic system - Abstract
The electrochemical reduction of dysprosium(III) was studied on W and Cu electrodes in eutectic LiCl–KCl by transient electrochemical methods. Cyclic voltammogram and current reversal chronopotentiogram results demonstrated that dysprosium(III) was directly reduced to dysprosium (0) on the W electrode through a single-step process with the transfer of three electrons. Electrochemical measurements on the Cu electrode showed that different Cu–Dy intermetallics are formed. Moreover, the thermodynamic properties of Cu–Dy intermetallic compounds were estimated by open circuit chronopotentiometry in a temperature range of 773–863 K. Using the linear polarization method, the exchange current density (j0) of dysprosium in eutectic LiCl–KCl on the Cu electrode was estimated, and the temperature dependence of j0 was studied to estimate the activation energies associated with Dy(III)/Cu5Dy and Dy(III)/Cu9/2Dy couples. In addition, potentiostatic electrolysis was conducted to extract dysprosium on the Cu electrode, and five Cu–Dy intermetallic compounds, CuDy, Cu2Dy, Cu9/2Dy, Cu5Dy and Cu0.99Dy0.01 were identified by X-ray diffraction, scanning electron microscopy and energy dispersive spectrometry. Meanwhile, the change of dysprosium(III) concentration was monitored using inductively coupled plasma-atomic emission spectrometry, and the maximum extraction efficiency of dysprosium was found to reach 99.2%.
- Published
- 2017
34. The open circuit potential of hydrogen peroxide at noble and glassy carbon electrodes in acidic and basic electrolytes
- Author
-
Qing Wen, Guiling Wang, Xia Jing, Dianxue Cao, Jinling Yin, Yinyi Gao, and Yao Liu
- Subjects
General Chemical Engineering ,Inorganic chemistry ,chemistry.chemical_element ,Electrolyte ,Glassy carbon ,engineering.material ,Electrochemistry ,Analytical Chemistry ,chemistry ,Transition metal ,Basic solution ,engineering ,Noble metal ,Platinum ,Palladium - Abstract
The open circuit potentials (OCPs) of H 2 O 2 at Pt, Pd, Au, and glassy carbon electrodes are measured in H 2 SO 4 and NaOH electrolyte solutions. Effects of concentration of H + , OH − and H 2 O 2 as well as temperature on the OCP of H 2 O 2 are investigated. The OCP of H 2 O 2 is much lower than its theoretical reduction potential in both acidic and basic medium. The OCP is actually a mixed potential of H 2 O 2 electroreduction and electrooxidation simultaneously occurring at electrode surfaces and it is more close to the equilibrium potential of H 2 O 2 electrooxidation rather than electroreduction. The OCP of H 2 O 2 is around 0.77–0.80 V at [H + ] = [H 2 O 2 ] = 1.0 mol dm −3 in H 2 SO 4 solution and is about 0–0.06 V at [OH − ] = [H 2 O 2 ] = 1.0 mol dm −3 in NaOH at 298 K on Pt, Pd, Au and GC electrodes. The OCP of H 2 O 2 is independent of H 2 O 2 concentration within the range of 0.01 to 1.0 mol dm −3 . It increases approximately linearly with the logarithm of H + concentration from 0.02 to 2.0 mol dm −3 , decreases with the logarithm of OH − concentration from 0.01 to 1.0 mol dm −3 and decreases with increase of temperature from 278 K to 333 K. The linear equations were presented and discussed.
- Published
- 2011
- Full Text
- View/download PDF
35. Preparation and supercapacitance of CuO nanosheet arrays grown on nickel foam
- Author
-
Yinyi Gao, Jichun Huang, Shuli Chen, Guiling Wang, and Dianxue Cao
- Subjects
Materials science ,Renewable Energy, Sustainability and the Environment ,Energy Engineering and Power Technology ,chemistry.chemical_element ,Nanotechnology ,Electrolyte ,Capacitance ,Dielectric spectroscopy ,Nickel ,Chemical engineering ,chemistry ,Transmission electron microscopy ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,Cyclic voltammetry ,Current density ,Nanosheet - Abstract
CuO nanosheet arrays freely standing on nickel foam are prepared via a template-free growth method. The morphology of CuO nanosheet arrays is examined by scanning and transmission electron microscopy and the phase structure of nanosheets is analyzed by X-ray diffraction spectroscopy. The supercapacitance of CuO nanosheet arrays is investigated by cyclic voltammetry, galvanostatic charge/discharge test and electrochemical impedance spectroscopy. The results show that the array of CuO nanosheets forms a uniform film of around 5 μm in thickness on nickel foam skeleton. The film is composed of clusters of arrays of nanosheets with a thickness up to around 150 nm. The CuO nanosheet arrays exhibit a specific capacitance of 569 F g−1 at a current density of 5 mA cm−2 in 6.0 mol dm−3 KOH electrolyte. The capacitance loss is less than 17.5% after 500 charge/discharge cycles at 10 mA cm−2 and with columbic efficiency higher than 93%.
- Published
- 2011
- Full Text
- View/download PDF
36. An Alkaline Al-H2O2 Semi-Fuel Cell Based on a Nickel Foam Supported Co3O4 Nanowire Arrays Cathode
- Author
-
Yong-Mei Tian, Gui Ling Wang, Ting Lei, Qing Wen, Yinyi Gao, Dianxue Cao, and Jinling Yin
- Subjects
Materials science ,Renewable Energy, Sustainability and the Environment ,Open-circuit voltage ,Inorganic chemistry ,Nanowire ,Energy Engineering and Power Technology ,chemistry.chemical_element ,Nanoparticle ,Cathode ,law.invention ,Volumetric flow rate ,Nickel ,chemistry ,Chemical engineering ,law ,Transmission electron microscopy ,Electrode - Abstract
The electrode of Co3O4 nanowire arrays directly grown on nickel foam is prepared via a facile one-step method. The electrode is characterised by scanning and transmission electron microscopy and tested as the cathode of an Al–H2O2 semi-fuel cell. We found that Co3O4 forms clusters of nanowires with length up to around 15 μm and diameter around 250 nm. The nanowire is composed of interconnected nanoparticles. Effects of H2O2 concentrations, catholyte KOH concentration, catholyte flow rate and operation temperature on the cell performance are investigated. The cell exhibited an open circuit voltage of 1.4 V, and peak power densities of 85 and 137 mW cm–2 at 25 and 65 °C, respectively, while running on 0.4 mol L–1 H2O2 at a flow rate of 80 mL min–1.
- Published
- 2011
- Full Text
- View/download PDF
37. Effects of acetone on electrooxidation of 2-propanol in alkaline medium on the Pd/Ni-foam electrode
- Author
-
Guiling Wang, Yao Liu, Yuanhui Cheng, Yinyi Gao, and Dianxue Cao
- Subjects
Renewable Energy, Sustainability and the Environment ,Inorganic chemistry ,Energy Engineering and Power Technology ,chemistry.chemical_element ,Electrolyte ,Chronoamperometry ,Propanol ,chemistry.chemical_compound ,Nickel ,chemistry ,Electrode ,Acetone ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,Cyclic voltammetry ,Palladium - Abstract
Acetone is the main product of 2-propanol electrooxidation in both acid and alkaline electrolytes; it always co-exists with 2-propanol in the reaction solution due to its liquid nature. Whether acetone will affect the electrooxidation of 2-propanol has not been well documented, which is a key issue that needs to be addressed for the direct 2-propanol fuel cell. In this study, the influence of acetone on the electrooxidation of 2-propanol in alkaline medium is investigated, using state-of-the-art Pd electrode, by cyclic voltammetry and chronoamperometry. The electrode is prepared using a chemical replacement method, by dipping nickel foam into acidified PdCl2 solution, and characterized by scanning electron microscopy. We found that the presence of acetone adversely affects electrooxidation performance of 2-propanol and substantially reduces the oxidation current of 2-propanol on Pd in alkaline medium. The acetone poisoning effect is interpreted by a competitive adsorption mechanism, in which acetone adsorbs onto Pd surface and occupies the active sites for 2-propanol electrooxidation, leading to a significant decrease in the number of these sites for 2-propanol electrooxidation. The results of this study point out that efficient electrocatalysts for 2-propanol electrooxidation in alkaline electrolytes must be non-adsorptive to acetone besides being highly active to 2-propanol oxidation.
- Published
- 2011
- Full Text
- View/download PDF
38. Oxygen evolution reaction on Ni-substituted Co3O4 nanowire array electrodes
- Author
-
Guiling Wang, Pan Wang, Bangan Lu, Dianxue Cao, and Yinyi Gao
- Subjects
Materials science ,Order of reaction ,Renewable Energy, Sustainability and the Environment ,Analytical chemistry ,Nanowire ,Oxygen evolution ,Energy Engineering and Power Technology ,Condensed Matter Physics ,Electrochemistry ,Dielectric spectroscopy ,Fuel Technology ,Electrode ,Atomic ratio ,Cyclic voltammetry - Abstract
Nanowire arrays of mixed oxides of Co and Ni freely standing on Ni foam are prepared by a template-free growth method. The effects of Ni content on the morphology, structure and catalyst performance for oxygen evolution reaction are investigated by scanning electron microscopy, X-ray diffraction spectroscopy and electrochemical techniques including cyclic voltammetry, chronopotentiometry and electrochemical impedance spectroscopy. A transformation from nanowire arrays to nanoplate arrays is found with the increase of the atomic ratio of Ni to Co in the preparation solution. The Ni x Co 3−x O 4 electrode obtained at 1:1 of Ni:Co in the preparation solution exhibits nanowire array structure and has better catalytic performance for oxygen evolution reaction than other Ni x Co 3−x O 4 and Co 3 O 4 electrodes. The catalytic activities of the Ni x Co 3−x O 4 and Co 3 O 4 electrodes are correlated with their surface roughness. Superior stability of the Ni x Co 3−x O 4 nanowire array electrode is demonstrated by a chronopotentiometric test. The reaction orders with respect to OH − on the Ni x Co 3−x O 4 electrode are close to 2 and 1 at low and high overpotentials, respectively.
- Published
- 2011
- Full Text
- View/download PDF
39. A direct NaBH4–H2O2 fuel cell using Ni foam supported Au nanoparticles as electrodes
- Author
-
Guiling Wang, Rongrong Miao, Dianxue Cao, Yao Liu, and Yinyi Gao
- Subjects
Renewable Energy, Sustainability and the Environment ,Chemistry ,Open-circuit voltage ,Inorganic chemistry ,Energy Engineering and Power Technology ,Nanoparticle ,chemistry.chemical_element ,Condensed Matter Physics ,Cathode ,Anode ,law.invention ,Nickel ,Fuel Technology ,Chemical engineering ,Direct borohydride fuel cell ,law ,Electrode ,Power density - Abstract
Au/Ni-foam electrodes with three dimensional network structures are prepared by simple spontaneous deposition of nano-sized Au particles onto nickel foam surface in an aqueous solution of AuCl3. Their morphology and catalytic performance for NaBH4 electrooxidation and H2O2 electroreduction in NaOH solution are investigated. Au particles with diameters smaller than 100 nm are uniformly deposited on the whole surface of all skeletons of the nickel foam substrate. The onset potential for NaBH4 electrooxidation and H2O2 electroreduction is about −1.2 V and −0.1 V, respectively. A direct liquid feed alkaline NaBH4–H2O2 fuel cell is constructed using Au/Ni-foam electrode as both the anode and the cathode. The effects of the concentration of NaBH4 and H2O2 and operation temperature on the fuel cell performance are investigated. The fuel cell exhibits an open circuit voltage of about 1.07 V and a peak power density of 75 mW cm−2 at a current density of 150 mA cm−2 and a cell voltage of 0.5 V operating on 0.2 mol dm−3 NaBH4 and 0.5 mol dm−3 H2O2 at 40 °C.
- Published
- 2010
- Full Text
- View/download PDF
40. Nickel Foam Supported-Co3O4 Nanowire Arrays for H2O2 Electroreduction
- Author
-
Wang Guiling, Yinyi Gao, Jinling Yin, Dianxue Cao, Cuilei Yin, and Lin Cheng
- Subjects
Thermogravimetric analysis ,Materials science ,Scanning electron microscope ,General Chemical Engineering ,Nanowire ,Nanotechnology ,General Chemistry ,Chronoamperometry ,Dielectric spectroscopy ,Chemical engineering ,Transmission electron microscopy ,Differential thermal analysis ,Materials Chemistry ,Cyclic voltammetry - Abstract
Ni foam supported-Co3O4 nanowire arrays are prepared by a template-free growth method, followed by a thermal treatment in air, and are characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, infrared spectroscopy, and thermogravimetric and differential thermal analysis. The Co3O4 nanowires have a diameter of about 250 nm, a length up to 15 μm, and a Brunauer-Emmett-Teller surface area of 78.4 m2 g−1. They grow almost vertically from the surface of Ni foam skeleton, pack densely, and uniformly cover the entire surface of Ni foam skeleton. Electroreduction of H2O2 on Co3O4 nanowire arrays in alkaline medium is investigated by cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy. The Co3O4 nanowire electrode exhibits superior activity, stability, and mass transport property for H2O2 electroreduction. A current density of 90 mA cm−2 is achieved at −0.4 V in 0.4 mol dm−3 H2O2 and 3.0 mol dm−3 NaOH at room temperature. The per gram current...
- Published
- 2009
- Full Text
- View/download PDF
41. ChemInform Abstract: Nickel Foam Supported-Co3O4Nanowire Arrays for H2O2Electroreduction
- Author
-
Lin Cheng, Wang Guiling, Dianxue Cao, Yinyi Gao, Cuilei Yin, and Jinling Yin
- Subjects
Thermogravimetric analysis ,Chemical engineering ,Transmission electron microscopy ,Chemistry ,Scanning electron microscope ,Differential thermal analysis ,Nanowire ,General Medicine ,Cyclic voltammetry ,Chronoamperometry ,Dielectric spectroscopy - Abstract
Ni foam supported-Co3O4 nanowire arrays are prepared by a template-free growth method, followed by a thermal treatment in air, and are characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, infrared spectroscopy, and thermogravimetric and differential thermal analysis. The Co3O4 nanowires have a diameter of about 250 nm, a length up to 15 μm, and a Brunauer-Emmett-Teller surface area of 78.4 m2 g−1. They grow almost vertically from the surface of Ni foam skeleton, pack densely, and uniformly cover the entire surface of Ni foam skeleton. Electroreduction of H2O2 on Co3O4 nanowire arrays in alkaline medium is investigated by cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy. The Co3O4 nanowire electrode exhibits superior activity, stability, and mass transport property for H2O2 electroreduction. A current density of 90 mA cm−2 is achieved at −0.4 V in 0.4 mol dm−3 H2O2 and 3.0 mol dm−3 NaOH at room temperature. The per gram current...
- Published
- 2010
- Full Text
- View/download PDF
42. Nickel Foam Supported-Co3O4Nanowire Arrays for H2O2Electroreduction.
- Author
-
Guiling Wang, Dianxue Cao, Cuilei Yin, Yinyi Gao, Jinling Yin, and Lin Cheng
- Published
- 2009
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.