科研之友
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摘要
The carbon materials, having different degree of the graphitization, were oxidation-treated with a sodium chlorate and 70 wt.% of nitric acid to achieve an electrochemically active material with a larger capacitance. Among non-graphitizable pitch, needle coke and natural graphite, the structure of needle coke was easily changed to the graphite oxide after oxidation treatment, and the inter-layer distance of the oxidized needle coke was expanded to 6.8 nm. This oxidized needle coke has exhibited largest specific capacitance per weight and volume of 29.5 F/g and 24.5 F/ml, respectively, at the two-electrode system in the potential range of 0-2.5 V. The electrochemical performance of the oxidized needle coke was discussed with the phenomenon of the electric field activation, and was compared with the results of KOH-activated needle coke as previously reported.
- 出版日期2008-5
