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Acta Physico-Chimica Sinica  2006, Vol. 22 Issue (12): 1445-1450    DOI: 10.3866/PKU.WHXB20061203
Article     
A New Kind of Redox Electrolyte Electrochemical Capacitor System
LI Qiang;LI Kai-Xi;SUN Guo-Hua;FAN Hui;GU Jian-Yu
(Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China; Graduate School of the Chinese Academy of Sciences, Beijing 100049, P. R. China)
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Abstract  The electrochemical characteristics and pseudocapacitive effects of Fe3+/Fe2+ ion pair were investigated in an electrochemical capacitor (EC) system using porous carbon as electrode material and with H2SO4 solution containing Fe3+/Fe2+ ion pair as electrolyte. The cyclic voltammetric results indicated that highly reversible electrochemical redox reactions of Fe3+/Fe2+ ion pair occurred within the nano-pore structures of the porous carbon electrodes. Symmetrical charge/discharge cycles were achieved due to the existence of Fe3+/Fe2+ ion pair, which effectively improved the capacity of the electrochemical capacitor system. Apart from its excellent cyclic stability, the specific capacitance of the single electrode system reached 174 mAh•g−1, which is 109 mAh•g−1 higher than that obtained for H2SO4 as the electrolyte. The charge/discharge mechanism of Fe3+/Fe2+ ion pair in the EC systems was discussed and a new type of redox electrolyte electrochemical capacitor was suggested.

Key wordsElectrochemical capacitor      Faradic pseudocapacitance      Porous carbon      Fe3+/Fe2+ ion pair      Electrosorption     
Received: 19 May 2006      Published: 06 December 2006
Corresponding Authors: LI Kai-Xi     E-mail: likx99@yahoo.com
Cite this article:

LI Qiang;LI Kai-Xi;SUN Guo-Hua;FAN Hui;GU Jian-Yu. A New Kind of Redox Electrolyte Electrochemical Capacitor System. Acta Physico-Chimica Sinica, 2006, 22(12): 1445-1450.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20061203     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2006/V22/I12/1445

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