Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (04): 757-761.doi: 10.3866/PKU.WHXB20090432

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Effect of the Activated Carbon Reactivation on Its Electrochemical Capacitance

 JIANG Qi, ZHAO Xiao-Feng, HUANG Bin, DU Bing, ZHAO Yong   

  1. Key Laboratory of Advanced Technologies of Materials (Ministry of Education of China), Superconductivity R&D Center, Southwest Jiaotong University, Chengdu 610031, P. R. China; School of Materials Science and Engineering, University of New South Wales, Sydney 2052 NSW, Australia
  • Received:2008-10-27 Revised:2008-12-22 Published:2009-03-31
  • Contact: JIANG Qi

Abstract: To enhance the electrochemical capacitance of activated carbon (AC), which is used as the electrode material for electrochemical super capacitors (ESC), the AC material was reactivated using chemical activation method and KOH as reactivation agent. The obtained material was designated as reactivated AC. Pristine AC and reactivated AC were both used as ESC electrode materials and simulated ESCs were assembled to test their electrochemical performance. Results showed that the electrochemical capacitance of the reactivated AC was enhanced up to 145.0 F·g-1 in organic electrolyte, while the pristine AC only obtained a value of 45.0 F·g-1. To determine the reason for the enhancement of the samples electrochemical capacitance, the specific surface area, N2 adsorption-desorption isotherms, and pore diameter distributions were investigated. Results showed that reactivation treatment enhanced the pore distribution content of 2 to 3 nm(pore diameter). Pores with diameters from2 to 3 nm(pore diameter) are thus important in the carbon material's electrochemical capacitance using organic electrolyte.

Key words: Activated carbon, Reactivation, Electrochemical super capacitor, Electrochemical capacitance


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