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Capacitive behavior of highly-oxidized graphite

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Materials Science-Poland

Abstract

Capacitive behavior of a highly-oxidized graphite is presented in this paper. The graphite oxide was synthesized using an oxidizing mixture of potassium chlorate and concentrated fuming nitric acid. As-oxidized graphite was quantitatively and qualitatively analyzed with respect to the oxygen content and the species of oxygen-containing groups. Electrochemical measurements were performed in a two-electrode symmetric cell using KOH electrolyte.

It was shown that prolonged oxidation causes an increase in the oxygen content while the interlayer distance remains constant. Specific capacitance increased with oxygen content in the electrode as a result of pseudo-capacitive effects, from 0.47 to 0.54 F/g for a scan rate of 20 mV/s and 0.67 to 1.15 F/g for a scan rate of 5 mV/s. Better cyclability was observed for the electrode with a higher oxygen amount.

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Authors and Affiliations

  1. Department of Inorganic, Analytical Chemistry and Electrochemistry, Faculty of Chemistry, Silesian University of Technology, Krzywoustego 6, 44-100, Gliwice, Poland

    Mateusz Ciszewski & Andrzej Mianowski

Authors
  1. Mateusz Ciszewski
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  2. Andrzej Mianowski
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Correspondence to Mateusz Ciszewski.

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Ciszewski, M., Mianowski, A. Capacitive behavior of highly-oxidized graphite. Mater Sci-Pol 32, 307–314 (2014). https://doi.org/10.2478/s13536-013-0200-y

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  • DOI: https://doi.org/10.2478/s13536-013-0200-y

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