Influence of oxygen treatment on electric double-layer capacitance of activated carbon fabrics

Chien To Hsieh, Hsisheng Teng

研究成果: Article同行評審

530 引文 斯高帕斯(Scopus)

摘要

Oxygen treatment at 250°C on polyacrylonitrile-based activated carbon fabric was conducted to explore the influence of carbon-oxygen complexes on the performance of capacitors fabricated with the carbon fabric. Surface analysis showed that most of the oxygen functional groups created from the oxygen treatment were the carbonyl or quinone type. The performance of the capacitors was tested in 1 M H2SO4, using potential sweep cyclic voltammetry and constant current charge-discharge cycling. It was found that the Faradaic current, the contributor of pseudocapacitance, increased significantly with the extent of oxygen treatment, while the increase in the double-layer capacitance was minor. Due to the treatment the overall specific capacitance showed an increase up to 25% (e.g., from 120 to 150 F g-1 at a current density of 0.5 mA cm-2). However, the distributed capacitance effect, the inner resistance and the leakage current were found to increase with the extent of oxidation. It is suggested that due to the local changes of charge density and the increase in redox activity the presence of the carbonyl- or quinone-type functional groups may induce double-layer formation, Faradaic current, surface polarity, and electrolyte decomposition.

原文English
頁(從 - 到)667-674
頁數8
期刊Carbon
40
發行號5
DOIs
出版狀態Published - 2002 四月

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 材料科學(全部)

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