The effect of carbonyl, carboxyl and hydroxyl groups on the capacitance of carbon nanotubes

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	The effect of carbonyl, carboxyl and hydroxyl groups on the capacitance of carbon nanotubes
	L. X. Li; F. Li
	2011
发表期刊	New Carbon Materials
ISSN	1007-8827
卷号	26 期号:3 页码:224-228
摘要	Concentrated H(2)SO(4):HNO(3) mixed acids, air, nitric acid and potassium permanganate were used to oxidize carbon nanotubes (CNTs) to introduce surface functional groups (SFGs) and the effects of the type and amount of SFGs on the electrochemical properties of CNT supercapacitors were investigated. XPS analysis shows that the mixed acid oxidation produces carbonyl (C=O) and the carboxyl (O-C=O) groups, the air oxidation results in hydroxyl and the smallest amount of carbonyl and carboxyl groups, and both the nitric acid and potassium permanganate treatments result in a moderate amount of carbonyl and carboxyl groups. It was found that the specific surface area and pore structures of the four samples are similar and carbonyl and carboxyl groups contribute the most to pseudo-capacitance through a Faradic reaction. In particular, the carbonyl group has a proportional relationship to the capacitance of CNTs. However, the hydroxyl group does not lead to an obvious increase of pseudo-capacitance, but can increase the electric double layer capacitance. The carbonyl and the carboxyl groups are advantageous for fast Faradic reactions to introduce pseudo-capacitance, owing to their lower charge transfer resistance than that of the hydroxyl group.
部门归属	[li feng] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [li li-xiang] univ sci & technol liaoning, inst mat electrochem res, anshan 114051, peoples r china.;li, f (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china;lxli2005@126.com fli@imr.ac.cn
关键词	Carbon Nanotubes Carbonyl Carboxyl Hydroxyl Pseudo-capacitance Double-layer Capacitance Activated Carbon Electrodes Oxygen Supercapacitors Purification Oxidation Sensors
URL	查看原文
WOS记录号	WOS:000293118200011
引用统计	被引频次：109[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/321006/30474
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. X. Li,F. Li. The effect of carbonyl, carboxyl and hydroxyl groups on the capacitance of carbon nanotubes[J]. New Carbon Materials,2011,26(3):224-228.
APA	L. X. Li,&F. Li.(2011).The effect of carbonyl, carboxyl and hydroxyl groups on the capacitance of carbon nanotubes.New Carbon Materials,26(3),224-228.
MLA	L. X. Li,et al."The effect of carbonyl, carboxyl and hydroxyl groups on the capacitance of carbon nanotubes".New Carbon Materials 26.3(2011):224-228.