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Preparation and Supercapacitive Performance of CuFe_(2)O_(4) Hollow-Spherical Nanoparticles

Chinese Journal of Chemical Physics 2023年第5期36卷 526-532,I0001页

作者： Yu Zhang Qingguang Zhu Yaqi Zhao Xin Yang Ling Jiang College of Chemistry and Chemical Engineering Xinyang Normal UniversityXinyang 464000China Xinyang Key Laboratory of Low-Carbon Energy materials Xinyang Normal UniversityXinyang 464000China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Spinel-type CuFe_(2)O_(4)nanoparticles were syn-thesized by a solvother-mal method using ethy-lene glycol as solvent and polyvinylpyrroli-done(PVP)as *** characteriza-tion results showed that the average diameter of the hollow-spherical CuFe_(2)O_(4)was approximately 100 nm with homogeneous morphology and negligible ***_(2)O_(4)was used as the active electrode material to explore its su-percapacitive properties in different concentrations of KOH *** was found that the CuFe_(2)O_(4)hollow-spherical nanoparticles exhibit potential electronic performance in superca-pacitor,with a specific capacitance of 368.2 F/g and capacitance stability retention of 91.0%after 2000 cycles at the current density of 5 A/g in 3 mol/L KOH *** present findings demonstrate that the CuFe_(2)O_(4)electrode materials can have important implications with practical prospects in energy storage systems.

关键词： Supercapacitor electrode material Composite metallic oxide

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Preparation of Flax Residue Activated Carbon by KOH Method and Its electrode Performance

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materials Sciences and Applications 2021年第9期12卷 417-435页

作者： Bing Wang Shujun Li Wenying Tan School of material Science and Engineering Northeast Forestry University Key Laboratory of Biomass Material Science and Technology of Ministry of Education of China Harbin China

In this study, activated carbon was prepared by the potassium hydroxide activation method with flax residues as raw materials. High-quality activated carbon was prepared by single factor and orthogonal experiments. Iodine adsorption and methylene blue adsorption were used as performance indicators. As prepared activated carbon was characterized by XRD, XPS and SEM. The results showed that the optimized electrode material was prepared under an impregnation ratio of 1:2, activation temperature of 800°C and activation time of 100 min. The yield of activated carbon was 49.48%, the iodine value was 1667.13 mg/g and the methylene blue value was 429 mg/g. The specific surface area measured by the automatic porosity analyzer is 1221 m2/g, and the mass-specific capacitance is 215.7 F/g under current density of 0.1 A/g.

关键词： Flax Residue Activated Carbon Activation Electrochemical Performance electrode material

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Studies of performance of activated carbon loaded with nickel hydroxide and its application for asymmetrical supercapacitor

Studies of performance of activated carbon loaded with nicke...

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2007中国科协年会

作者： Qinghua Huang Xianyou Wang* Jun Li Chunling Dai Na Li Siyong Yi School of Chemistry,Xiangtan University,Hunan 411105,China

In order to enhance specific capacitance of carbon-based supercapacitor,some particles of nickel hydroxide were loaded into activated carbon(AC)by a simple chemical *** properties were characterized by X-ray diffraction(XRD)and N2 adsorption *** showed that β-Nickel hydroxide/Activated carbon composite were *** BET surface area of the composite decreased compared to that of the pure activated carbon. Electrochemical performances of the samples were studied by cyclic voltammetry,galvanostatic charge/discharge and electrochemical impedance *** indicated that the composites had good electrocheimical behaviors and high *** composite and activated carbon were used to prepared asymmetrical *** specific capacitance of asymmetrical supercapacitor was up to 338.7 F g-1 in 6 M KOH electrolyte,which increased 35.1% comparing with AC-AC supercapacitor(250.6 F g-1).In addition,the asymmetrical supercapacitor showed high reversibility,and low resistance.

关键词： β-Nickel hydroxide/Activated carbon Composite electrode material Asymmetrical supercapacitor Impedance

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Metal-Organic Framework Derived Porous Nanotubes as a High Performance Supercapacitor electrode

Metal-Organic Framework Derived Porous Nanotubes as a High P...

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中国化学会第九届全国无机化学学术会议

作者：李辉薛鹏徐骞王吉德 Key Laboratory of Oil and Gas Fine Chemicals Ministry of Education ＆ Xinjiang Uygur Autonomous RegionChemistry and Chemical Engineering of Xinjiang University

Metal-organic frameworks（MOFs） were recently found to be an effective precursor for the preparation of high-performance supercapacitor electrode materials based on its high surface areas, tunable pore sizes and multiple functionalities [1-3]. Co3O4 was deemed to be an ideal electrode material for supercapacitor due to its low cost, great redox activity and extremely high theoretical capacitance[3]. In this work, porous Co3O4 nanotubes have been prepared by calcining Co-MOF-74 nanorods at an optimized temperature. The shell of the Co3O4 nanotube is composed by interconnected nanoparticles with small sizes（Fig. 1a）. The electrochemical capacitance behavior of the nanotube electrode was investigated by cyclic voltammetry and galvanostatic charge–discharge studies in 2 mol L-1 KOH solution. The electrochemical data demonstrated that the Co3O4 nanotubes display good capacitive behavior with a specific capacitance of 1310 and 1100 F g-1 at a current density of 1 and 4 A g-1, respectively. The pore size distribution calculated from the Barrett Joyner Halenda（BJH） method shows that the Co3O4 are hierarchical porous composites with a narrow distribution centered at 2.4 nm, a wide distribution centered around 12 nm. The BET surface area of the material was 52.8 m2/g. Besides high capacitance, Co3O4 nanotubes also show excellent cycling stability and good electric conductivity, indicating that it can be promising electroactive materials for supercapacitor. The remarkable performance should result from special morphology and appropriate pore size distribution of Co3O4 nanocrystallites.

关键词： supercapacitors Co3O4 porous nanotuble Metal-organic frameworks electrode material

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Elements, Structure and Electrochemical Property of Carbon Derived from La^(3+) Adulterating Polystyrene Cation Exchange Resin

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Journal of Rare Earths 2000年第3期18卷 214-214页

作者： WANG Shu jun 1, LIU Qing guo 2 ( 1. Department of Chemical Engineer, University of Petroleum Beijing, Beijing 102200, China 2. Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China)

The polystyrene cation exchange resin was exchanged by La 3+ and then were carbonized to make resin carbon material. The electrochemical properties of the resin carbon material as the electrode of the lithium ion cell were investigated. The test results show that comparing with the polystyrene cation exchange resin without adulterating, the contents of hydrogen, oxygen and sulfur are changed obviously for the resin carbon material derived from the La 3+ adulterating polystyrene cation exchange resin. The contents of hydrogen and oxygen are increased, and the one of sulfur is decreased. The test results also indicate that it is more easily to form the stratum graphite minicrystal structure with bigger diameter for the La 3+ adulterating resin. According to the electrochemical test results, the electrode derived from La 3+ adulterating polystyrene cation exchange resin has much better electrochemical property, and the capacity of charge and discharge of the electrode is increased about 30 mAh·g -1 in average.

关键词： rare earths ion adulterating polystyrene cation exchange resin carbon electrode material

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