Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (03): 261-266.doi: 10.3866/PKU.WHXB20050307

• ARTICLE • Previous Articles     Next Articles

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

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