The Dependence of the Electronic Conductivity of Carbon Molecular Sieve Electrodes on Their Charging States

The dependence of the electronic conductivity of activated carbon electrodes on their potential in electrolyte solutions was examined. Kapton polymer films underwent carbonization (1000 °C), followed by a mild oxidation process (CO2 at 900 °C) for various periods of time, to obtain carbons of differ...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2006-04, Vol.110 (14), p.7443-7448
Main Authors: Pollak, Elad, Genish, Isaschar, Salitra, Gregory, Soffer, Abraham, Klein, Lior, Aurbach, Doron
Format: Article
Language:English
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Summary:The dependence of the electronic conductivity of activated carbon electrodes on their potential in electrolyte solutions was examined. Kapton polymer films underwent carbonization (1000 °C), followed by a mild oxidation process (CO2 at 900 °C) for various periods of time, to obtain carbons of different pore structures. A specially designed cell was assembled in order to measure the conductivity of carbon electrodes at different potentials in solutions. When the carbon electrodes possessed molecular sieving properties, a remarkable dependence of their conductivity on their charging state was observed. Aqueous electrolyte solutions containing ions of different sizes were used in order to demonstrate this phenomenon. As the average pore size of the activated carbons was larger, their molecular sieving ability was lower, and the dependence of their conductivity on their charging state regained its classical form. This behavior is discussed herein.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp060060c