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Electronic Supplementary Information

Design and synthesis of NiCo2O4-reduced graphene oxide

composites for high performance supercapacitors

Huan-Wen Wang, Zhong-Ai Hu*, Yan-Qin Chang, Yan-Li Chen,

Hong-Ying Wu, Zi-Yu Zhang, and Yu-Ying Yang

Key Laboratory of Eco-Environment-Related Polymer Materials of Ministry of

Education

Key Laboratory of Polymer Materials of Gansu Province

College of Chemistry and Chemical Engineering, Northwest Normal University,

Lanzhou 730070, PR China

* Corresponding author. Tel.: +86 931 7973255; Fax: +86 931 8859764

Email address: zhongai@nwnu.edu.cn

Electronic Supplementary Material (ESI) for Journal of Materials ChemistryThis journal is © The Royal Society of Chemistry 2011

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Fig S1. XRD pattern of the residual sediment obtained from the HCl leaching of the

NiCo2O4-RGO composite.

Fig S2. Raman spectra of RGO and the NiCo2O4-RGO composite.

Electronic Supplementary Material (ESI) for Journal of Materials ChemistryThis journal is © The Royal Society of Chemistry 2011

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Fig S3. TEM image of the residual sediment obtained from the HCl leaching of the

NiCo2O4-RGO composite.

Fig S4. Electrochemical behaviors of NiCo2O4 RGO mixture: (a) CV curves at

various scan rates. (b) Galvanostatic discharge curves at various specific current. (c)

Specific capacitance at different specific currents. (d) The evolution of the specific

capacitance versus the number of cycles at 2 A g-1.

Electronic Supplementary Material (ESI) for Journal of Materials ChemistryThis journal is © The Royal Society of Chemistry 2011