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题名: Lanthanum Doped Manganese Dioxide/Carbon Nanotube Composite Electrodes for Electrochemical Supercapacitors
作者: Xue Rong1;  Yan Jing-Wang1;  Tian Ying1;  Yi Bao-Lian1
关键词: Supercapacitor ;  Multi-walled carbon nanotube ;  Lanthanum ;  Manganese dioxide ;  Pseudocapacitance
刊名: ACTA PHYSICO-CHIMICA SINICA
发表日期: 2011-10-01
DOI: 10.3866/PKU.WHXB20111002
卷: 27, 期:10, 页:2340-2346
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: 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.
关键词[WOS]: SINGLE-WALLED NANOTUBES ;  CARBON NANOTUBES ;  DOUBLE-LAYER ;  OXIDE ;  CAPACITORS ;  PERFORMANCE ;  DEPOSITION
语种: 英语
WOS记录号: WOS:000295380300013
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142617
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Liaoning Provin, Peoples R China

Recommended Citation:
Xue Rong,Yan Jing-Wang,Tian Ying,et al. Lanthanum Doped Manganese Dioxide/Carbon Nanotube Composite Electrodes for Electrochemical Supercapacitors[J]. ACTA PHYSICO-CHIMICA SINICA,2011,27(10):2340-2346.
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