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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2006,Vol.22>> Issue(12)>> 1445-1450     doi: 10.3866/PKU.WHXB20061203         中文摘要
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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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.

Keywords: Electrochemical capacitor   Faradic pseudocapacitance   Porous carbon   Fe3+/Fe2+ ion pair   Electrosorption  
Received: 2006-05-19 Accepted: 2006-06-28 Publication Date (Web): 2006-12-06
Corresponding Authors: LI Kai-Xi Email: 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[J]. Acta Phys. -Chim. Sin., 2006,22 (12): 1445-1450.    doi: 10.3866/PKU.WHXB20061203
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