Rational design of reduced graphene oxide for superior performance of supercapacitor electrodes

Rasul, Shahid, Alazmi, A., Jaouen, K., Hedhili, M.N. and Costa, P.M.F.J. (2017) Rational design of reduced graphene oxide for superior performance of supercapacitor electrodes. Carbon, 111. pp. 774-781. ISSN 0008-6223

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Abstract

Strategies to synthesize reduced graphene oxide (rGO) abound but, in most studies, research teams select one particular oxidation-reduction method without providing a methodic reasoning for doing so. Herein, it is analyzed how diverse oxidation-reduction strategies commonly used can result in considerable performance differences of rGO for supercapacitor applications. Depending on the graphite oxidation method followed, the surface chemistry analysis of the products confirms that there is a marked disparity in the degree of oxidation and the nature of the oxygen functional groups present. Subsequent reduction of the oxidized graphite (using three different methods) showed that the maximum specific capacitance of rGOs produced from the classical Hummers' method was 128 F g−1 whereas an analogous material obtained from an improved Hummers' method reached ∼274 F g−1 (both via an hydrothermal reduction route). Besides showing that the improved oxidation method results in superior capacitance performance, explained by the higher number of structural defects allied to a surface chemistry where residual hydroxyl and epoxy functional groups predominate, this study highlights the need to rationalize the oxidation-reduction strategies followed when investigating applications of rGO materials.

Item Type:	Article
Subjects:	H600 Electronic and Electrical Engineering J500 Materials Technology not otherwise specified
Department:	Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User:	Paul Burns
Date Deposited:	03 Apr 2019 15:16
Last Modified:	10 Oct 2019 20:46
URI:	http://nrl.northumbria.ac.uk/id/eprint/38728

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