煅烧
电容
硝酸
电化学
微型多孔材料
活性炭
解吸
碳纤维
化学
电极
氧气
无机化学
化学工程
材料科学
催化作用
吸附
复合材料
有机化学
物理化学
复合数
工程类
作者
Yau-Ren Nian,Hsisheng Teng
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2002-01-01
卷期号:149 (8): A1008-A1008
被引量:273
摘要
Nitric acid oxidation of activated carbon fabric in combination with calcination in at different temperatures was conducted to explore the influence of surface carbon-oxygen complexes on the performance of electrochemical capacitors fabricated with the carbon fabric. The performance of the capacitors was tested in 1 M within a potential range of and 0.6 V. The specific capacitance of the carbon was found to increase upon oxidation. Surface complex analysis using temperature programmed desorption showed that the double-layer capacitance was enhanced due to the presence of CO-desorbing complexes while -desorbing complexes exhibited a negative effect. The micropore resistance for ion migration was low for these carbons. The electrical connection resistance between the fabric and the backing plate as well as that between the carbon fibers accounted for the major proportion of the overall resistance and was shown to increase due to oxidation. A capacitance increase of more than 40% has been achieved, without increasing IR drop, by nitric acid oxidation followed by 450°C calcination that was shown to remove the majority of the -desorbing complexes while retaining the CO-desorbing complexes. © 2002 The Electrochemical Society. All rights reserved.
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