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Acta Phys. Chim. Sin.  2014, Vol. 30 Issue (12): 2256-2262    DOI: 10.3866/PKU.WHXB201409302
ELECTROCHEMISTRY AND NEW ENERGY     
SnO2/Graphite Nanosheet Composite Electrodes and Their Application in Supercapacitors
CHEN Chan-Juan, HU Zhong-Ai, HU Ying-Ying, LI Li, YANG Yu-Ying, AN Ning, LI Zhi-Min, WU Hong-Ying
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, P. R. China
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Abstract  

Electrochemical exfoliation of graphite rods under the action of an electric field force led to the formation of two-dimensional (2D) graphite nanosheet arrays (GNSAs) perpendicular to the surface of the graphite substrate and parallel to each other in arrangement. Subsequently, SnO2/graphite nanosheet array (SnO2/GNSA) composite electrodes were prepared by the cathodic reduction electrodeposition method. The morphology, composition, and microstructure of the samples were characterized using field emission scanning electron microscopy (FESEM), powder X-ray diffraction (XRD), and Fourier transform infrared (FT-IR) spectroscopy, respectively. Electrochemical measurements showed that the composite electrodes achieved specific capacitance values as high as 4105 F·m-2 in the potential window up to 1.4 V with a scan rate of 5 mV·s-1 in 0.5 mol·L-1 LiNO3 solution. Asymmetric supercapacitor fabricated with the as-prepared SnO2/GNSAs exhibited excellent capacitive performance with energy density of 0.41 Wh·m-2 in the potential window up to 1.8 V and retention of 81% after 5000 cycles.



Key wordsSupercapacitor      Graphite nanosheet array      SnO2      Composite electrode      Electrochemical performance     
Received: 09 June 2014      Published: 30 September 2014
MSC2000:  O646  
Fund:  

The project was supported by the National Natural Science Foundation of China (20963009, 21163017) and Specialized Research Fund for the Doctoral Program of Higher Education, China (20126203110001).

Corresponding Authors: HU Zhong-Ai     E-mail: zhongai@nwnu.edu.cn
Cite this article:

CHEN Chan-Juan, HU Zhong-Ai, HU Ying-Ying, LI Li, YANG Yu-Ying, AN Ning, LI Zhi-Min, WU Hong-Ying. SnO2/Graphite Nanosheet Composite Electrodes and Their Application in Supercapacitors. Acta Phys. Chim. Sin., 2014, 30(12): 2256-2262.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB201409302     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2014/V30/I12/2256

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