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

	Lanthanum Doped Manganese Dioxide/Carbon Nanotube Composite Electrodes for Electrochemical Supercapacitors
	Xue Rong; Yan Jing-Wang; Tian Ying; Yi Bao-Lian
刊名	acta physico-chimica sinica
	2011-10-01
卷号	27 期号:10 页码:2340-2346
关键词	Supercapacitor Multi-walled carbon nanotube Lanthanum Manganese dioxide Pseudocapacitance
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.
WOS标题词	science & technology ; physical sciences
类目[WOS]	chemistry, physical
研究领域[WOS]	chemistry
关键词[WOS]	single-walled nanotubes ; carbon nanotubes ; double-layer ; oxide ; capacitors ; performance ; deposition
收录类别	SCI
语种	英语
WOS记录号	WOS:000295380300013
公开日期	2015-11-17
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/142617]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Liaoning Provin, Peoples R China
推荐引用方式 GB/T 7714	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.
APA	Xue Rong,Yan Jing-Wang,Tian Ying,&Yi Bao-Lian.(2011).Lanthanum Doped Manganese Dioxide/Carbon Nanotube Composite Electrodes for Electrochemical Supercapacitors.acta physico-chimica sinica,27(10),2340-2346.
MLA	Xue Rong,et al."Lanthanum Doped Manganese Dioxide/Carbon Nanotube Composite Electrodes for Electrochemical Supercapacitors".acta physico-chimica sinica 27.10(2011):2340-2346.