The electrochemical performance of a multi-wall carbon nanotube/activated carbon mixture as the electrode of electric double layer capacitors analyzed by electrochemical impedance

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	The electrochemical performance of a multi-wall carbon nanotube/activated carbon mixture as the electrode of electric double layer capacitors analyzed by electrochemical impedance
	X. Geng; F. Li; D. W. Wang; H. M. Cheng
	2011
发表期刊	New Carbon Materials
ISSN	1007-8827
卷号	26 期号:4 页码:307-312
摘要	Activated carbon was prepared from petroleum coke by chemical activation. Multi-walled carbon nanotubes (MWCNTs) were mixed with the activated carbon to form the electrode material of electric double layer capacitors. According to the relative values of impedance and capacitance in electrochemical impedance, the available capacitance and energy dissipation from resistance were evaluated. Results showed that the real part of the capacitance for this mixture was higher than for activated carbon alone when activated carbon was mixed with a mass fraction 3% -15% MWCNTs. With the increase of MWCNT content, the imaginary part of the capacitance and its percentage decreases while the real part of capacitance and its percentage increases. It was revealed that the efficiency of energy storage was improved, the relaxation time constant was decreased, the characteristic of capacitance response versus frequency was improved and the electrode resistance was decreased by the addition of MWCNTs to activated carbon.
部门归属	[geng xin] univ sci & technol liaoning, sch chem engn, dept appl chem, anshan 114015, peoples r china. [geng xin; li feng; wang da-wei; cheng hui-ming] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;geng, x (reprint author), univ sci & technol liaoning, sch chem engn, dept appl chem, anshan 114015, peoples r china;gengxin60@163.com
关键词	Activated Carbon Multi-walled Carbon Nanotubes Electrochemical Impedance Spectroscopy Relaxation Time Constant Research-and-development Supercapacitors Coke
URL	查看原文
WOS记录号	WOS:000295809300010
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/30347
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. Geng,F. Li,D. W. Wang,et al. The electrochemical performance of a multi-wall carbon nanotube/activated carbon mixture as the electrode of electric double layer capacitors analyzed by electrochemical impedance[J]. New Carbon Materials,2011,26(4):307-312.
APA	X. Geng,F. Li,D. W. Wang,&H. M. Cheng.(2011).The electrochemical performance of a multi-wall carbon nanotube/activated carbon mixture as the electrode of electric double layer capacitors analyzed by electrochemical impedance.New Carbon Materials,26(4),307-312.
MLA	X. Geng,et al."The electrochemical performance of a multi-wall carbon nanotube/activated carbon mixture as the electrode of electric double layer capacitors analyzed by electrochemical impedance".New Carbon Materials 26.4(2011):307-312.