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Citation: LI Qiang, LI Kai-Xi, SUN Guo-Hua, FAN Hui, GU Jian-Yu. A New Kind of Redox Electrolyte Electrochemical Capacitor System[J]. Acta Physico-Chimica Sinica, ;2006, 22(12): 1445-1450. doi: 10.3866/PKU.WHXB20061203 shu

A New Kind of Redox Electrolyte Electrochemical Capacitor System

1.
(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)

Received Date: 19 May 2006
Available Online: 6 December 2006

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.
- Electrochemical capacitor;Faradic pseudocapacitance;Porous carbon;Fe3+/Fe2+ ion pair;Electrosorption
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