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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2009,Vol.25>> Issue(02)>> 229-236     doi: 10.3866/PKU.WHXB20090206         中文摘要
Electrochemical Properties of Manganese Oxide Surface-Modified Activated Carbon Electrode Materials
GAO Qiang; LIU Ya-Fei; HU Zhong-Hua; ZHENG Xiang-Wei; WEN Zu-Biao
Department of Chemistry, Tongji University, Shanghai 200092, P. R. China
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To improve electrochemical properties of activated carbon (AC), a commercial AC was modified by
means of soaking in manganese nitrate solution and subsequent pyrolysis. Nitrogen adsorption at 77 K, SEM, and XRD were used to study the surface area, porosity, profile of modified AC, and the crystal structure of deposited manganese oxides. The performance of electrochemical capacitors using the modified AC as electrode materials was investigated by cyclic voltammograms, ac (alternating current) impedance, and constant current charge/discharge. Results showed that manganese oxides, especially α-Mn2O3, produced from the Mn(NO3)2 decomposition had an obvious pseudo-capacitance effect. This effect was coupled with the electrical double layer capacitance of AC to form a complex capacitance so that the specific capacitance of modified AC could be as high as 254 F·g-1 which is 54% higher than that of the unmodified AC. In addition, the tested capacitor with modified AC electrodes showed excellent performance during reversible charge-discharge and also displayed high stability. Its equivalent series resistance was small at 0.40 Ω. After a long termtest of 2000-cycles the capacitance retained nearly 100% of its original value.

Keywords: Activated carbon   Surface modification   Electrode material   Electrochemical capacitor   Manganese oxide  
Received: 2008-08-08 Accepted: 2008-11-17 Publication Date (Web): 2008-12-10
Corresponding Authors: HU Zhong-Hua Email: huzh@tongji.edu.cn


Cite this article: GAO Qiang; LIU Ya-Fei; HU Zhong-Hua; ZHENG Xiang-Wei; WEN Zu-Biao. Electrochemical Properties of Manganese Oxide Surface-Modified Activated Carbon Electrode Materials[J]. Acta Phys. -Chim. Sin., 2009,25 (02): 229-236.    doi: 10.3866/PKU.WHXB20090206
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