Fabrication of electrochemically reduced graphene oxide/cobalt oxide composite for charge storage electrodes

García-Gómez, A.; Duarte, R. G.; Eugénio, Sónia; Silva, Maria Teresa Oliveira de Moura e; Carmezim, M. J.; Montemor, Maria de Fátima

http://hdl.handle.net/10400.21/6040

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Authors

García-Gómez, A.

Duarte, R. G.

Eugénio, Sónia

Silva, Maria Teresa Oliveira de Moura e

Carmezim, M. J.

Montemor, Maria de Fátima

Abstract(s)

Electrochemically-reduced graphene oxide (Er-GO) and cobalt oxides (CoOx) were co-electrodeposited by cyclic voltammetry, from an electrolyte containing graphene oxide and cobalt nitrate, directly onto a stainless steel substrate to produce composite electrodes presenting high charge storage capacity. The electrochemical response of the composite films was optimized by studying the parameters applied during the electrodeposition process, namely the number of cycles, scan rate and ratio between GO/Co(NO3)(2) concentrations in the electrolyte. It is shown that, if the appropriate conditions are selected, it is possible to produced binder-free composite electrodes with improved electrochemical properties using a low-cost, facile and scalable technique. The optimized Er-GO/CoOx developed in this work exhibits a specific capacitance of 608 F g(-1) at a current density of 1 A g(-1) and increased reversibility when compared to single CoOx. (C) 2015 Elsevier B.V. All rights reserved.

Keywords

Electrochemically-reduced graphene oxide Cobalt oxides Electrodeposition Charge storage

URI

http://hdl.handle.net/10400.21/6040

Citation

GARCÍA-GÓMEZ, A.; [et al] - Fabrication of electrochemically reduced graphene oxide/cobalt oxide composite for charge storage electrodes. Journal of Electroanalytical Chemistry. ISSN 1572-6657. Vol. 755 (2015), pp. 151-157.