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Facile synthesis of reduced graphene oxide wrapped porous NiCo2O4 composite with superior performance as an electrode material for supercapacitors

Abstract

Even though NiCo2O4 is considered to be one of the most promising materials for supercapacitor applications, its unsatisfactory rate performance and cycling stability, due to inherent low electrical conductivity, has limited its further growth as a supercapacitor electrode. The present study tries to profitably exploit the reduced graphene oxide (rGO) nanosheet as a conducting unit to enhance the electronic conductivity, by a simple hydrothermal technique assisted by ammonia hydroxide, to improve the overall electrochemical performance of NiCo2O4 in supercapacitors. The as-prepared NiCo2O4-rGO nancomposite consists of NiCo2O4 hexagons wrapped in conducting rGO sheets, which ensure a short ion diffusion distance, percolating electron conducting pathways, and stable structural integrity. Such a feasible design provides good synergism between the rGO and the NiCo2O4, resulting in better electrochemical performance. As a result, this nanocomposite displays impressive overall electrochemical performance, in such aspects as promising capacitance (1185 F g-1 at a current density of 2 A g-1) and remarkable cycling stability (98% capacitance retention after 10000 charge-discharge cycles at 2 A g-1). This facile method could be beneficial for preparing similar materials that require high electronic conductivity.

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Publication details

The article was received on 14 Apr 2017, accepted on 12 Jul 2017 and first published on 12 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA03251J
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Facile synthesis of reduced graphene oxide wrapped porous NiCo2O4 composite with superior performance as an electrode material for supercapacitors

    S. Al-Rubaye, R. Rajagopalan, S. X. Dou and Z. Cheng, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03251J

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