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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2011,Vol.27>> Issue(10)>> 2340-2346     doi: 10.3866/PKU.WHXB20111002         中文摘要
ELECTROCHEMISTRY AND NEW ENERGY
Lanthanum Doped Manganese Dioxide/Carbon Nanotube Composite Electrodes for Electrochemical Supercapacitors
XUE Rong, YAN Jing-Wang, TIAN Ying, YI Bao-Lian
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, P. R. China
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Although higher specific capacitances have been achieved for manganese dioxide/multi-walled carbon nanotubes (MnO2/MWCNTs), the low conductivity of MnO2 is still the main obstacle in increasing its loading or film thickness. Another problem is that the cycling stability of MnO2/MWCNTs is much lower than that of activated carbon electrodes. Therefore, this new type of electrode material is still limited in application until now. In this paper, lanthanum doped MnO2/MWCNTs composites were prepared by an in situ redox method. The surface morphology and phase structure of the as-prepared samples were investigated by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spectrometry. The electrochemical properties were investigated by cyclic voltammetry (CV), galvanostatic charge/discharge, and electrochemical impedance spectroscopy (EIS). The La-doped MnO2 could be formed on the MWCNTs by the reduction of MnO4-. The resistance of the composite electrodes decreased because La doping increases the number of imperfections in the MnO2 lattice, which improves the electrical conductivity and the electrochemical activity of the electrode. La doping is, therefore, an effective way to overcome the intrinsic low electric conductivity of MnO2, which facilitates an increase in the loading or the film thickness of MnO2 without increasing electrode resistance. The major effect of La doping is a significant improvement in the charge/discharge cycling performance of a symmetric electrochemical supercapacitor with electrodes composed of MnO2/ MWCNTs. The specific capacitance of the composite electrodes was improved by La doping.

Keywords: Supercapacitor   Multi-walled carbon nanotube   Lanthanum   Manganese dioxide   Pseudocapacitance  
Received: 2011-02-24 Accepted: 2011-07-13 Publication Date (Web): 2011-08-15
Corresponding Authors: YAN Jing-Wang Email: yanjw@dicp.ac.cn

Fund: The project was supported by the Important Directional Project of‘the Research and Exploration of Supercapacitor Storage System for Electric Vehicle’from Dalian Institute of Chemical Physics, Chinese Academy of Sciences, China.

Cite this article: XUE Rong, YAN Jing-Wang, TIAN Ying, YI Bao-Lian. Lanthanum Doped Manganese Dioxide/Carbon Nanotube Composite Electrodes for Electrochemical Supercapacitors[J]. Acta Phys. -Chim. Sin., 2011,27 (10): 2340-2346.    doi: 10.3866/PKU.WHXB20111002
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