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Acta Phys. Chim. Sin.  2008, Vol. 24 Issue (07): 1143-1148    DOI: 10.1016/S1872-1508(08)60049-2
Article     
Surface Modification and Performance of Activated Carbon Electrode Material
LIU Ya-Fei; HU Zhong-Hua; XU Kun; ZHENG Xiang-Wei; GAO Qiang
Department of Chemistry, Tongji University, Shanghai 200092, P. R. China
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Abstract  A commercial activated carbon was modified by surface treatment using three chemicals, nitric acid, hydrogen peroxide, and ammonia, respectively. The modified carbons were characterized by N2 adsorption-desorption is otherms and FTIR spectroscopy. The resultant carbon electrode-based electric double-layer capacitors (EDLCs) were assembled with 6 mol·L-1 KOH as the electrolyte. The influence of surface modification on the performance of EDLCs was studied by galvanostatic charge-discharge, cyclic voltammetry, and alternating current impedance. The surface modification resulted in no big decrease in specific surface area and little decrease in average pore size, and introduced functional groups, such as hydroxyl, carbonyl, and amidogen, on the carbon surface. These functional groups significantly improved the wettability and reduced the resistance of the activated carbon. As a result, the specific capacitance of the carbon modified with 65%HNO3 reached 250 F·g-1, 72.4% higher than that of original carbon. The leakage current of testing EDLCs decreased unexpectedly to 3-18 μA, only 0.8%-4.9% that of the original carbon electrode-based EDLC (371 μA).

Key wordsActivated carbon      Electric double-layer capacitor      Surface modification      Electrode material      Specific capacitance     
Received: 14 January 2008      Published: 07 May 2008
MSC2000:  O649  
Corresponding Authors: HU Zhong-Hua     E-mail: huzh@mail.tongji.edu.cn
Cite this article:

LIU Ya-Fei; HU Zhong-Hua; XU Kun; ZHENG Xiang-Wei; GAO Qiang. Surface Modification and Performance of Activated Carbon Electrode Material. Acta Phys. Chim. Sin., 2008, 24(07): 1143-1148.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.1016/S1872-1508(08)60049-2     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2008/V24/I07/1143

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