Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (5): 881-890.doi: 10.3866/PKU.WHXB201403061

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Hydrothermal Synthesis and Electrochemical Measurements of Interconnected Porous Carbon/MnO2 Composites

ZHANG Xuan-Xuan1, RAN Fen1,2, FAN Hui-Li1, KONG Ling-Bin1,2, KANG Long1,2   

  1. 1 School of Material Science and Engineerings, Lanzhou University of Technology, Lanzhou 730050, P. R. China;
    2 State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, P. R. China
  • Received:2013-11-08 Revised:2014-03-04 Published:2014-04-25
  • Contact: RAN Fen, KANG Long E-mail:ranfen@163.com;kangl@lut.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51203071, 51363014, 51362018), Key Project of the Ministry of Education of China (212183), and Natural Science Funds for Distinguished Young Scholars of Gansu Province, China (1111RJDA012).

Abstract:

This article describes the electrochemical performance of a novel interconnected porous carbon/ MnO2 (IPC/MnO2) composite prepared by in situ self-limiting deposition under hydrothermal condition. The morphology and structure were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA), and the electrochemical behavior was investigated using cyclic voltammetry (CV), charge-discharge tests, electrochemical impedance spectroscopy (EIS), and cycle life tests. The results showed that MnO2 grew homogeneously on the IPC surface, forming a hierarchical microstructure. The MnO2 had a typical K-Birnessite-type crystal structure and the MnO2 content was about 34%(w). At high synthetic temperatures, the MnO2 particles on the IPC surface were smaller. The prepared electrode material exhibited a good electrochemical capacitance performance. As the reaction temperature increased, the specific capacitance of the IPC/MnO2 composite first increased and then remained constant. The IPC/MnO2 composite synthesized at 100 ℃ had the maximum specific capacitance, 411 F·g-1, in a three-electrode system. An asymmetric supercapacitor was constructed with the IPC/MnO2 composite as the positive electrode and activated carbon (AC) as the negative electrode, in a 1 mol·L-1 Na2SO4 electrolyte. The results showed that the corresponding potential window increased from 1 to 1.8 V. The maximum specific capacitance of the asymmetric supercapacitor was 86 F·g-1 and a good rate capability was achieved.

Key words: Manganese oxide, Interconnected porous carbon, Supercapacitor, Composite electrode material

MSC2000: 

  • O646