Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第19卷    第9期    总第126期    2009年9月

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文章编号:1004-0609(2009)09-1642-07
苯甲酸修饰碳纳米管的制备及其负载Co(OH)2
电化学电容性能
高  博,陈胜尧,傅清宾,原长洲,张校刚

(南京航空航天大学 材料科学与技术学院,南京 210016)

摘 要: 以苯甲酸功能化碳纳米管为基底,制备Co(OH)2/苯甲酸化功能化碳纳米管复合材料。苯甲酸官能团在合成过程中发挥了双重作用:既明显改善碳纳米管在去离子水中的分散性,又使得碳纳米管管壁与Co2+表面结合能力大大加强。透射电子显微镜、扫描电子显微镜以及X射线衍射等表征表明,Co(OH)2在碳纳米管上的分散性得到很大改善;电化学实验结果表明,该复合材料拥有优良的电容行为,其比容量在电流密度为5 mA/cm2时达到322.3 F/g,较Co(OH)2/纯化碳纳米管复合材料以及纯Co(OH)2电极高出100 F/g左右。实验结果表明,以苯甲酸功能化碳纳米管为基底可以进一步有效提高Co(OH)2的利用率。

 

关键字: 电化学电容器;苯甲酸功能化;碳纳米管;氢氧化亚钴

Preparation and electrochemical capacitive performance of Co(OH)2/benzoic acid functionalized carbon nanotubes
GAO Bo, CHEN Sheng-yao, FU Qing-bin, YUAN Chang-zhou, ZHANG Xiao-gang

College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics,
 Nanjing 210016, China

Abstract:An effective method to synthesize structurally uniform Co(OH)2/f-MWCNTs composite was described by using benzoic acid functionalized MWCNTs as substrate. Benzoic acid group is bifunctional both for solubilizing MWCNTs into deionized water and for tethering Co2+ precursor onto MWCNTs surfaces to facilitate the follow-up chemical deposition of Co(OH)2 by supplying surface binding and anchoring sites. The composite has a uniform surface dispersion and large coverage of Co(OH)2 onto f-MWCNTs, which is characterized by XRD, TEM, SEM. Electrochemical tests demonstrate that the Co(OH)2/f-MWCNTs composite possesses good electrochemical capacitive performance and delivers higher capacity of 322.3 F/g at 5 mA/cm2, which exceeds about 100 F/g higher than Co(OH)2/p-MWCNTs and pure Co(OH)2. The presented work implies that using f-MWCNTs as substrate is an effective approach to enhance the utilization of Co(OH)2.

 

Key words: electrochemical capacitor; benzoic acid functionalized; carbon nanotube; cobalt hydroxide

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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