物理化学学报 >> 2005, Vol. 21 >> Issue (03): 261-266.doi: 10.3866/PKU.WHXB20050307

研究论文 上一篇    下一篇

聚苯胺/活性碳复合型超电容器的电化学特性

王晓峰; 阮殿波; 王大志; 梁吉   

  1. 清华大学精密仪器与机械系,北京 100084; 清华大学机械工程系,北京 100084
  • 收稿日期:2004-07-15 修回日期:2004-10-01 发布日期:2005-03-15
  • 通讯作者: 王晓峰 E-mail:xfw@mail.tsinghua.edu.cn

Hybrid Electrochemical Supercapacitors Based on Polyaniline and Activated Carbon Electrodes

WANG Xiao-Feng; RUAN Dian-Bo; WANG Da-Zhi; LIANG Ji   

  1. Department of Precision Instruments and Mechanics, Tsinghua University, Beijing 100084; Department of Mechanical Engineering, Tsinghua University, Beijing 100084
  • Received:2004-07-15 Revised:2004-10-01 Published:2005-03-15
  • Contact: WANG Xiao-Feng E-mail:xfw@mail.tsinghua.edu.cn

摘要: 电化学电容器作为一种新型储能器件具有广泛的应用.采用(NH4)2S2O8化学氧化聚合苯胺法制备了聚苯胺电极材料,采用化学物理二次催化活化法制备了高比表面积活性碳材料.并用循环伏安、恒流充放电以及交流阻抗等方法对上述电极材料的电化学特性进行了研究.实验结果表明,所制备的聚苯胺电极材料具有高于420 F•g-1的法拉第赝电容和良好的电化学特性,所制备的活性碳电极材料则具有160 F•g-1的双电层电容量.分别采用聚苯胺作为正极,活性碳作为负极,38%硫酸作为电解液制备了复合型电化学电容器.复合型电容器工作电压达到1.4 V, 电容器单体比电容达到57 F•g-1,最大比能量和最大真实比功率分别达到15.5 W•h•kg-1和2.4 W•g-1, 峰值比功率达到20.4 W•g-1,电容器循环工作寿命超过500次. 与活性碳双电层电容器相比,复合型电容器还具有较低的自放电率.

关键词: 聚苯胺, 活性碳, 超电容器, 复合型电容器

Abstract: This study reports a hybrid capacitor in H2SO4 aqueous electrolyte, which consists of polyaniline as a cathode and activated carbon as an anode. The electrochemical performance of the hybrid capacitor is characterized by cyclic voltammetry and a constant current charge/discharge test. The hybrid capacitor shows capacitor behavior with an extended operating voltage of 1.4 V. From integrating the cyclic voltammetry curve, specific capacitances of 420 F•g-1 and 160 F•g-1 are obtained for polyaniline and activated carbon, respectively. The cycling behavior of the hybrid electrochemical capacitor is examined in a two-electrode cell by means of cyclic voltammetry. From constant current charging and discharging test, the values for the specific energy and real specific power are 15.5 W•h•kg-1 and 2.4 W•g-1, respectively, in the cell voltage range between 0 and 1.4 V. The maximum specific power reach a value of 20.4 W•g-1. The self-discharge rate of this hybrid supercapacitor is much lower than the double layer capacitor composed of activated carbon electrodes.

Key words: Polyaniline, Activated carbon, Supercapacitor, Hybrid capacitor