Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (07): 1679-1684.doi: 10.3866/PKU.WHXB20110623

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Preparation and Characterization of Peasecod-Based Activated Carbons as Electrode Materials for Electrochemical Double-Layer Capacitors

CAO Guo-Fei, LIAO Yi, ZHANG Xiao-Hua, CHEN Jin-Hua   

  1. State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
  • Received:2010-11-22 Revised:2011-04-19 Published:2011-06-28
  • Contact: CHEN Jin-Hua E-mail:chenjinhua@hnu.edu.cn
  • Supported by:

    The project was supported by the Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT), Ministry of Education China, Natural Science Foundation of Hunan Province, China (04JJ1008), and Specialized Research Fund for the Doctoral Program of Higher Education, China (20040532006).

Abstract:

Activated carbons for electrochemical double-layer capacitor electrodes were prepared from peasecod-based carbons using ZnCl2 or KOH as activating agents. The pore structures of the prepared activated carbon materials were characterized using N2 adsorption. The specific surface area of the peasecod-based carbon materials increased obviously from 1.69 m2·g-1 to 2237 m2·g-1 by KOH activation and to 621 m2·g-1 by ZnCl2 treatment. The electrochemical properties of the prepared peasecod-based activated carbon materials were evaluated by cyclic voltammetry and galvanostatic charge-discharge, and a specific capacitance as high as 297.5 F·g-1 in 6 mol·L-1 KOH aqueous electrolyte was obtained for the KOH-treated carbon material. Additionally, the KOH-activated peasecod-based carbon material showed excellent long-term charge-discharge cycle stability and a 8.6% decrease in the specific capacitance was observed at a high current density of 5 A·g-1 after 500 cycles.

Key words: Double-layer capacitor, Activated carbon, Peasecod, Energy storage, Agricultural waste

MSC2000: 

  • O646