Issue 35, 2018

Electrochemical tuning of capacitive response of graphene oxide

Abstract

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

Graphical abstract: Electrochemical tuning of capacitive response of graphene oxide

Article information

Article type
Paper
Submitted
08 Jun 2018
Accepted
07 Aug 2018
First published
07 Aug 2018

Phys. Chem. Chem. Phys., 2018,20, 22698-22709

Electrochemical tuning of capacitive response of graphene oxide

S. J. Gutić, D. K. Kozlica, F. Korać, D. Bajuk-Bogdanović, M. Mitrić, V. M. Mirsky, S. V. Mentus and I. A. Pašti, Phys. Chem. Chem. Phys., 2018, 20, 22698 DOI: 10.1039/C8CP03631D

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