Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (12): 2256-2262.doi: 10.3866/PKU.WHXB201409302

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

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   

  1. 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
  • Received:2014-06-09 Revised:2014-09-29 Published:2014-11-27
  • Contact: HU Zhong-Ai E-mail:zhongai@nwnu.edu.cn
  • Supported by:

    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).

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 words: Supercapacitor, Graphite nanosheet array, SnO2, Composite electrode, Electrochemical performance

MSC2000: 

  • O646