Citation: XUE Rong, YAN Jing-Wang, TIAN Ying, YI Bao-Lian. Lanthanum Doped Manganese Dioxide/Carbon Nanotube Composite Electrodes for Electrochemical Supercapacitors[J]. Acta Physico-Chimica Sinica, ;2011, 27(10): 2340-2346. doi: 10.3866/PKU.WHXB20111002 shu

Lanthanum Doped Manganese Dioxide/Carbon Nanotube Composite Electrodes for Electrochemical Supercapacitors

1.
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, P. R. China

Received Date: 24 February 2011
Available Online: 15 August 2011
Fund Project:

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.
- Supercapacitor,
- Multi-walled carbon nanotube,
- Lanthanum,
- Manganese dioxide,
- Pseudocapacitance
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