Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (04): 414-418.doi: 10.3866/PKU.WHXB20050414

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Electrochemical Performances of Supercapacitor with Polyaniline Particles with Hierarchy as Active Electrode Material

YANG Hong-Sheng; ZHOU Xiao; ZHANG Qing-Wu   

  1. Institute of Polymer, Department of Chemical Engineering, Tsinghua University, Beijing 100084
  • Received:2004-08-24 Revised:2004-12-06 Published:2005-04-15
  • Contact: ZHOU Xiao

Abstract: Polyaniline (PANi) particles with hierarchy are prepared by adding (NH4)2S2O8 dropwise into aqueous solution containing aniline monomer and HCl acid at 0 ℃ under nitrogen atmosphere with stirring. SEM images show that the resulted PANi particles are composed of their primary particles, which are composed of multi-layer flakes. Symmetric redox supercapacitor (prototype) is assembled with the PANi particles as active electrode materials and 2 mol•L-1 H2SO4 aqueous solution as electrolyte. The electrochemical performances of the supercapacitor are tested with cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. When the charge-discharge current is 7 mA, the specific energy and specific power of the supercapacitor can reach 6.35 Wh•kg-1 and 132 W•kg-1 (based on the mass of PANi), respectively;the capacitance of PANi electrode is about 408 F•g-1 . When the charge-discharge current is 20 mA, the specific energy and specific power of the super-capacitor can reach 4.39 Wh•kg-1 and 328 W•kg-1 (based on the weight of PANi), respectively; the capacitance of PANi electrode is about 324 F•g-1 . During 100 charge-discharge cycles, the discharge capacity of the supercapacitor is constant, and the charge-discharge efficiency is 95%. The results show that the PANi supercapacitor with hierarchial particles as active electrode material can store a great deal of charge and energy in H2SO4 solution.

Key words: Polyaniline, Supercapacitor, Electrochemical capacitor, Conducting polymer