物理化学学报 >> 2010, Vol. 26 >> Issue (08): 2151-2157.doi: 10.3866/PKU.WHXB20100636

电化学 上一篇    下一篇

活性炭表面担载氧化锰复合电极的电化学电容性能

田颖1,2, 阎景旺1, 刘小雪1, 薛 荣1, 衣宝廉1   

  1. 1. 中国科学院大连化学物理研究所, 辽宁 大连 116023;
    2. 大连交通大学环境与化学工程学院, 辽宁 大连 116028
  • 收稿日期:2009-12-22 修回日期:2010-02-25 发布日期:2010-07-23
  • 通讯作者: 阎景旺 E-mail:yanjw@dicp.ac.cn
  • 基金资助:

     中国科学院大连化学物理研究所重要方向性项目“电动汽车用超级电容器储能系统的研究与开发”资助项目

Electrochemical Capacitance of Composites with MnOx Loaded on the Surface of Activated Carbon Electrodes

TIAN Ying1,2, YAN Jing-Wang1, LIU Xiao-Xue1, XUE Rong1, YI Bao-Lian1   

  1. 1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, P. R. China;
    2. College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning Province, P. R. China
  • Received:2009-12-22 Revised:2010-02-25 Published:2010-07-23
  • Contact: YAN Jing-Wang E-mail:yanjw@dicp.ac.cn
  • Supported by:

    The project was supported by the Important Directional Project of ‘the Research and Exploration of Supercapacitor Storage System for Electric Vehicle’ from Dalian Institute of Chemical Physics, Chinese Academy of Sciences.

摘要:

通过在两种商品活性炭XC-72(比表面250 m2·g-1)和YEC-8(比表面1726 m2·g-1)电极表面涂刷Mn(NO3)2, 并在200 ℃进行热分解得到表面担载氧化锰的复合材料电极. 采用扫描电子显微镜(SEM)和X射线衍射(XRD)表征电极的形貌和氧化锰的晶体结构, 采用循环伏安、恒流充放电和交流阻抗考察了不同电极的电化学电容性能. 结果表明, Mn(NO3)2在200 ℃的热解产物是α-Mn2O3和α-Mn3O4的混合物. 当C和MnOx的质量比为2∶1和9∶1时, XC-72/MnOx中氧化锰的比电容分别达到499和435 F·g-1, YEC-8/MnOx中氧化锰的比电容分别达到554和606 F·g-1, 表明氧化锰的赝电容对电极比电容的贡献十分显著.

关键词: 超级电容器, 氧化锰, 活性炭, 热分解

Abstract:

Activated carbon/manganese oxide (MnOx) composites were prepared by the thermal decomposition of Mn(NO3)2 that was impregnated on the surface of activated carbon XC-72 with a specific surface area of 250 m2·g-1 and on YEC-8 with a specific surface area of 1726 m2·g-1 at 200 ℃. The surface morphology and crystalline structure of the composites were investigated using scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The electrochemical properties of the composites were tested by cyclic voltammetry, galvanostatic charge-discharge, and impedance spectroscopy. We found that α-Mn2O3 and α-Mn3O4 were formed when the composites were annealed at 200 ℃. At mass ratios of C and MnOx of 2∶1 and 9∶1, the specific capacitance of MnOx in the composites of XC-72/MnOx was 499 and 435 F·g-1 and the specific capacitance of MnOx in the composites of YEC-8/MnOx was 554 and 606 F·g-1, respectively. This suggests a significant contribution of pseudocapacitance from MnOx to the specific capacitance of the electrode.

Key words: Supercapacitor, Manganese oxide, Activated carbon, Thermal decomposition

MSC2000: 

  • O646