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Enhancement of Electrochemical Capacitance of Carbon Nanotubes by Polythionine Modification
Author(s) -
Xu Ying,
Zhang Xiaoyan,
Wang Yanzhi,
He Pingang,
Fang Yuzhi
Publication year - 2010
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201090089
Subject(s) - carbon nanotube , capacitance , thionine , chemistry , cyclic voltammetry , nanotechnology , supercapacitor , nanocomposite , electrochemistry , double layer capacitance , chemical engineering , electrode , materials science , dielectric spectroscopy , engineering
Thionine molecules have been electropolymerized onto different types of carbon nanotubes (CNT) using a cyclic voltammetry scanning technology, including multi‐walled carbon nanotubes, single‐walled carbon nanotubes and aligned carbon nanotubes. Results indicate that such prepared nanocomposites have combined the intrinsic faradic capacitance of polythionine with the double layer capacitance of polythionine‐CNT, and thus the polythionine modification obviously enhanced the CNT capacitance. Especially the carboxyl group modified multi‐walled carbon nanotubes, which have made their nanotube tips opened, allowed much more electropolymerization cycles and then obtained a most significant increment in capacitance than the other three ones.