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Electrochemical tuning of capacitive response of graphene oxide

Abstract

Increasing energy demands of modern society requires deep understanding of the properties of energy storage materials as well as their performance tuning. We show that the capacitance of graphene oxide (GO) can be precisely tuned using a simple electrochemical reduction route. In situ resistance measurements, combined with cyclic voltammetry measurements and Raman spectroscopy, have shown that upon the reduction GO is irreversibly deoxygenated which is further accompanied with structural ordering and increasing of electrical conductivity. The capacitance is maximized when the concentration of oxygen functional groups is properly balanced with the conductivity. Any further reduction and de-oxygenation leads to the gradual loss of the capacitance. The observed trend is independent on the preparation route and on the exact chemical and structural properties of GO. It is proposed that an improvement of capacitive properties of any GO can be achieved by optimization of its reduction conditions.

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Publication details

The article was received on 08 Jun 2018, accepted on 07 Aug 2018 and first published on 07 Aug 2018


Article type: Paper
DOI: 10.1039/C8CP03631D
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Electrochemical tuning of capacitive response of graphene oxide

    S. Gutic, D. Kozlica, F. Korać, D. Bajuk-Bogdanovic, M. Mitrić, V. Mirsky, S. V. Mentus and I. A. Pasti, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP03631D

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