Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (10): 1876-1882.doi: 10.3866/PKU.WHXB201407172

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Synthesis of a Mesoporous Manganese Dioxide-Graphene Composite by a Simple Template-Free Strategy for High-Performance Supercapacitors

TANG Jia-Yong1, CAO Pei-Qi1, FU Yan-Bao2, LI Peng-Hui1, MA Xiao-Hua1   

  1. 1. Department of Materials Science, Fudan University, P. R. Shanghai 200433, P. R. China;
    2. Environmental and Energy Technologies Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720, USA
  • Received:2014-05-06 Revised:2014-07-15 Published:2014-09-30
  • Contact: MA Xiao-Hua E-mail:xhma@fudan.edu.cn
  • Supported by:

    The project was supported by the Ministry of Science and Technology of China (51201035).

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Abstract:

Amanganese dioxide (MnO2)-graphene composite material with a unique structure consisting of MnO2 surrounded by graphene sheets was prepared by a simple hydrothermal and thermal decomposition method. The morphology and structure of the obtained materials were examined by scanning electron microscopy, transition electron microscopy, Raman spectroscopy, X-ray diffraction, and N2 adsorption-desorption. Electrochemical properties were evaluated by cyclic voltammetry, galvanostatic charge- discharge and electrochemical impedance spectroscopy. The specific surface area increased from 109 to 168 m2·g-1 for the composite containing 15% (w) graphene. The specific capacitance also increased from 294 to 454 F·g-1 at a current density of 0.2 A·g-1 in an aqueous electrolyte supercapacitor. Moreover, after 2000 cycles of a galvanostatic charge-discharge test, the hybrid electrode still had excellent cycle stability (92% retention rate).

Key words: Manganese oxide, Graphene, Composite, Supercapacitor, Hydrothermal method, Energy storage