Electrochemical Introduction of Active Sites into Super-long Carbon Nanotubes for Enhanced Capacitance

Chemical Research in Chinese Universities ›› 2012, Vol. 28 ›› Issue (2): 302-307 .

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Electrochemical Introduction of Active Sites into Super-long Carbon Nanotubes for Enhanced Capacitance

HU Yue¹, ZHAO Yang¹, LI Yan¹, XIE Xue-jun², LI Hui¹, DAI Li-ming³, QU Liang-ti¹

1. Key Laboratory of Cluster Science, Ministry of Education, Department of Chemistry, Beijing Institute of Technology, Beijing 100081, P. R. China;
2. Department of Physics, Beijing Institute of Technology, Beijing 100081, P. R. China;
3. Department of Chemical Engineering, Case School of Engineering, Case Western Reserve University, Cleveland, OH 44106, USA

Received:2011-03-28 Revised:2011-05-23 Online:2012-03-25 Published:2012-03-08
Supported by:
Supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education of China(No.20100732002), the National Natural Science Foundation of China(No.21004006), the Research Foundation for the Doctoral Program of Higher Education of China(No.20101101120036), the 111 Project in China(No.B07012) and the Program for the New Century Excellent Talents in Universities of China(No.NCET-10-0047).

Abstract

Abstract: Electrochemical cyclic voltammetric(CV) scan was applied to inducing the partial oxidation and defects of carbon nanotubes(CNTs). The electrochemically induced functional groups and physical defects were demonstra- ted to show positive effects on the nanotube capacitance, as exemplified by super-long CNT arrays as model for the easy fabrication of CNT electrodes. Specifically, the initial hydrophobic nanotube surface becomes hydrophilic and a ten-time enhancement in capacitance is observed with respect to the pristine CNT sample. Thus, the electrochemical CV pretreatment can 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.

Key words: Energy storage, Electrochemical capacitor, Super-long carbon nanotube, Electrochemistry, Defect

HU Yue, ZHAO Yang, LI Yan, XIE Xue-jun, LI Hui, DAI Li-ming, QU Liang-ti. Electrochemical Introduction of Active Sites into Super-long Carbon Nanotubes for Enhanced Capacitance[J]. Chemical Research in Chinese Universities, 2012, 28(2): 302-307 .

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Electrochemical Introduction of Active Sites into Super-long Carbon Nanotubes for Enhanced Capacitance

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