Electrochemical introduction of active sites into super-long carbon nanotubes for enhanced capacitance

Hu Yue; Zhao Yang; Li Yan; Xie Xuejun; Li Hui; Dai Liming; Qu Liangti

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Electrochemical introduction of active sites into super-long carbon nanotubes for enhanced capacitance

Hu Yue 1 #,Zhao Yang 1,Li Yan 1,Xie Xuejun 2,Li Hui 1,Dai Liming 3,Qu Liangti 1 * #

1.Key Laboratory of Cluster Science, Ministry of Education, Department of Chemistry, Beijing Institute of Technology

2.Department of Physics, Beijing Institute of Technology

3.Department of Chemical Engineering, Case School of Engineering, Case Western Reserve University

*Correspondence author

#Submitted by

Subject:

Funding: 教育部博士点基金（No.20101101120036）, 国家自然科学基金（No.21004006）

Opened online:21 February 2011

Accepted by: none

Citation: Hu Yue,Zhao Yang,Li Yan.Electrochemical introduction of active sites into super-long carbon nanotubes for enhanced capacitance[OL]. [21 February 2011] http://en.paper.edu.cn/en_releasepaper/content/4409972

Electrochemical cyclic voltammetric (CV) scan was applied to induce the partial oxidation and defect formation along carbon nanotubes (CNTs). The electrochemically induced functional groups and physical defects were demonstrated to show positive effects on the nanotube capacitance, as exemplified by super-long CNT arrays as model for easy fabrication of the CNT electrodes. Specifically, the initial hydrophobic nanotube surface became hydrophilic and a ten-time enhancement in capacitance was observed with respect to the pristine CNT sample. Thus, the electrochemical CV pretreatment could be used as an effective approach to activate the CNT surface for an enhanced electrochemical performance in capacitors, and many other advanced devices beyond capacitors, such as electrochemical sensors and batteries.

Keywords:Physical chemistry; capacitance; carbon nanotube; electrochemistry; defects

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