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Issue 74, 2015
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Enhanced electrochemical performance of NiO by addition of sulfonated graphene for supercapacitors

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Abstract

A facile approach for the fabrication of NiO/sulfonated graphene composites (NiO/sGNS) using ammonium carbamate as a precipitating agent was developed. With an enhanced specific surface area and a desirable surface chemical environment, the NiO/sulfonated graphene composites exhibit excellent electrochemical performance. The results from cyclic voltammetry (CV) demonstrate that traditional electrical double-layer capacitive processes contribute to improving the storage energy capabilities of the NiO/sGNS composites. Galvanostatic charge–discharge tests show that the specific capacitance of the NiO/sulfonated graphene composites increased to 530 F g−1 at a current density of 1.0 A g−1 in comparison with specific capacitances of 382 F g−1 for NiO/thermal reduced graphene composites (NiO/TRG) and 238 F g−1 for pristine NiO. Moreover, electrochemical impedance spectroscopy (EIS) indicates the considerable effect of sulfonated graphene on building electron and ion transport channels for faradaic reaction processes of the NiO/sGNS composites.

Graphical abstract: Enhanced electrochemical performance of NiO by addition of sulfonated graphene for supercapacitors

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Article information


Submitted
18 May 2015
Accepted
26 Jun 2015
First published
26 Jun 2015

RSC Adv., 2015,5, 60141-60147
Article type
Paper
Author version available

Enhanced electrochemical performance of NiO by addition of sulfonated graphene for supercapacitors

L. Wang, H. Tian, L. Zhang, F. Gao, J. Gu, L. Hou, Y. Jiang and C. Wu, RSC Adv., 2015, 5, 60141
DOI: 10.1039/C5RA09176D

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