Capacitance Performance and Model Analysis of Activated Carbon Derived from Rice Husks

doi:10.7503/cjcu20120481

Abstract

Abstract:

Two mesoporous activated carbons with high surface area were prepared by NaOH or H₃PO₄ as activation agent and cheap rice husks as precursors. Their specific areas, pore parameters and electrochemical performances were characterized by nitrogen adsorption, cyclic voltammetric method, galvanostatic chronopotentiometry and electrochemical impedance spectroscopy. The capacitance of activated carbons using NaOH or H₃PO₄ as activation agent can be 145.8 and 168.5 F/g, respectively. The simulation of electrochemical impedance was carried out to characterize the impedance spectrum of activated carbons by a triple pore structure model of electrochemical double-layer capacitor with branch pore structure. The simulation results show that the new model is highly fit in with the actual structure.

Key words: Electrochemical capacitor, Rice husk activated carbon, Electrochemical impedance spectroscopy(EIS), Computer simulation

CLC Number:

O646

TrendMD:

WEN Bin, WEI Shuang, SHI Zhan, LIN Hai-Bo, LU Hai-Yan. Capacitance Performance and Model Analysis of Activated Carbon Derived from Rice Husks[J]. Chem. J. Chinese Universities, 2013, 34(3): 674.

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Capacitance Performance and Model Analysis of Activated Carbon Derived from Rice Husks

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