Electrochemical responses from surface oxides present on HNO3-treated carbons

解吸 氧化物 电化学 聚丙烯腈 碳纤维 热脱附 无机化学 阴极保护 化学 材料科学 分析化学(期刊) 吸附 电极 物理化学 有机化学 复合材料 聚合物 复合数
作者
Pei-Zhe Cheng,Hsisheng Teng
出处
期刊:Carbon [Elsevier BV]
卷期号:41 (11): 2057-2063 被引量:94
标识
DOI:10.1016/s0008-6223(03)00212-4
摘要

Carbons of different surface oxide compositions, which were prepared from HNO3 oxidation of polyacrylonitrile-based carbon fabric followed by heat treatment at different temperatures, were subjected to electrochemical response analysis using a voltammetric method. Temperature programmed desorption was employed to analyze the surface oxide composition. A significant amount of unstable oxides that can be irreversibly removed with reduction using a cathodic potential sweep were found to be present on the oxidized carbons. About 2.6 electrons are required to remove one oxygen atom from the carbon surface, and this may be the first quantitative study ever reported. After the initial cathodic sweep, no irreversible reduction peak response was observed for the subsequent electrochemical measurements. The capacitive performance of the carbons is related to the population of stable CO-desorbing complexes that can be determined with thermal desorption after the cathodic sweep. The present work has shown that carbon capacitance increases from 170 to 190 F/g with an increase of the CO-desorbing oxides from 1.31 to 1.56 mmol/g. This means that each stable CO-desorbing oxide is able to store 0.8 electron charge per volt within the potential window employed, suggesting the effective role of CO-desorbing oxides in improving the capacitance.

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