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电化学(中英文) ›› 2007, Vol. 13 ›› Issue (3): 279-283. 

• 研究论文 • 上一篇    下一篇

MnO_2/C复合材料的电化学电容特性研究

高军;黄行康;杨勇;   

  1. 厦门大学化学系,厦门大学化学系,厦门大学化学系 福建厦门361005,福建厦门361005,福建厦门361005
  • 收稿日期:2007-08-28 修回日期:2007-08-28 出版日期:2007-08-28 发布日期:2007-08-28

Electrochemical Capacitance Characteristics for MnO_2/C Composite

GAO Jun*,HUANG Xing-kang,YANG Yong   

  1. (Department of Chemistry,Xiamen University,Xiamen 361005,Fujian,China
  • Received:2007-08-28 Revised:2007-08-28 Published:2007-08-28 Online:2007-08-28

摘要: 应用乙炔黑直接还原高锰酸钾制备MnO2/C复合材料.样品结构及性能由XRD和SEM表征.研究了MnO2/C电极(正极)在不同电解液中的法拉第"准电容行为",及其循环伏安、交流阻抗与恒电流充放电等性能.实验表明,MnO2/C复合材料具有良好的电化学电容特性.在1 mol/L的KOH电解液中和电流密度为5 mA/cm2下,MnO2/C复合材料的比电容量可达258 F/g,并表现出良好的循环性能.

关键词: 电化学电容, MnO2/C复合材料, 比电容

Abstract: The MnO2/C composite was synthesized by reduction of KMnO4 with acetylene black.The products were characterized by XRD and SEM.We used MnO2/C composite as the positive electrode material of the electrochemical capacitor.The performance of faradic psedocapacitance of the MnO2/C electrode was studied in different electrolytes.The MnO2/C electrode was tested by cyclic voltammetry,electrochemical impedance spectroscopy(EIS) and constant charge-discharge curves.The experimental results showed that the MnO2/C composite has excellent performance.The specific capacitance of the MnO2/C composite as 258 F/g is obtained at 5mA/cm2 current density in 1mol/L KOH solution.It exhibited high discharge capacity and good cycle performance.

Key words: electrochemical capacitor, MnO2/C composite, specific capacitance

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