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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2014,Vol.30>> Issue(5)>> 881-890     doi: 10.3866/PKU.WHXB201403061         中文摘要
ELECTROCHEMISTRY AND NEW ENERGY
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 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
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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.



Keywords: Manganese oxide   Interconnected porous carbon   Supercapacitor   Composite electrode material  
Received: 2013-11-08 Accepted: 2014-03-04 Publication Date (Web): 2014-03-06
Corresponding Authors: RAN Fen, KANG Long Email: ranfen@163.com;kangl@lut.cn

Fund: 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).

Cite this article: ZHANG Xuan-Xuan, RAN Fen, FAN Hui-Li, KONG Ling-Bin, KANG Long. Hydrothermal Synthesis and Electrochemical Measurements of Interconnected Porous Carbon/MnO2 Composites[J]. Acta Phys. -Chim. Sin., 2014,30 (5): 881-890.    doi: 10.3866/PKU.WHXB201403061

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