Electrochemical behavior of glassy carbon electrodes modified by multi-walled carbon nanotube/surfactant films in a buffer solution and an ionic liquid
Electrochemical behavior of glassy carbon electrodes modified by multi-walled carbon nanotube/surfactant films in a buffer solution and an ionic liquid
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多壁碳纳米管/表面活性剂薄膜修饰的玻碳电极在缓冲溶液和离子液体中的电化学行为
DOI：
10.1016/j.carbon.2006.04.020
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发表时间：
2006-11-01
期刊：
影响因子：
10.9
通讯作者：
Hao, Jingcheng
中科院分区：
文献类型：
--
作者：
Li, Yi;Shi, Xingwang;Hao, Jingcheng
用循环伏安法研究了多壁碳纳米管(MWCNT)/表面活性剂复合膜电极在离子液体和磷酸盐缓冲溶液(pH=6.86)中的电化学行为。用扫描和透射电子显微镜研究了多壁碳纳米管在不同介质中的分散情况。在磷酸盐缓冲溶液中，MWCNT/两性十二烷基二甲胺氧化物在GC电极上的流延膜呈现典型的氧化还原电偶，优于MWCNT/阴离子十二烷基硫酸钠和阳离子烷基三甲基溴化铵。然而，在离子液体1-正丁基-3-甲基咪唑六氟磷酸盐([bmim][PF6])中，MWCNT/阳离子表面活性剂膜修饰的GC电极对MWCNTs有明显的不可逆还原。循环伏安曲线表明，表面活性剂的亲水基团在碳纳米管的电化学行为中起着重要作用。电解液也有重要的作用。在离子液体中，离子液体阳离子与多壁碳纳米管的强结合可能会改变修饰膜的结构，导致电化学行为的改变。(C)2006爱思唯尔有限公司。保留所有权利。
The electrochemical behavior of glassy carbon (GC) electrodes coated with multi-walled carbon nanotube (MWCNT)/surfactant films was studied in an ionic liquid and a phosphate buffer solution (pH = 6.86), using cyclic voltammetry. The dispersion of MWCNTs in different media was investigated by scanning and transmission electron microscopy. Cast films of MWCNT/zwitterionic dodecyldimethylamine oxide on a GC electrode show a typical redox couple in phosphate buffer solution, which is better than that of MWCNT/anionic sodium dodecyl sulfate and cationic alkytrimethylammonium bromide. However in the ionic liquid, 1-n-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]), the GC electrode modified by MWCNT/cationic surfactant films shows a well-defined irreversible reduction of MWCNTs. The cyclic voltammograms clearly show that the surfactant hydrophilic group plays an important role in the electrochemical behavior of the MWCNTs. The electrolytes also have an important effect. In an ionic liquid, the strong binding of the ionic liquid cations with the MWCNTs may change the structure of the modified films and lead to changes of electrochemical behavior. (c) 2006 Elsevier Ltd. All rights reserved.