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电极/离子液体界面电容
引用本文:赵娣,黄青,金先波,魏献军,陈政.电极/离子液体界面电容[J].物理化学学报,2010,26(5):1239-1248.
作者姓名:赵娣  黄青  金先波  魏献军  陈政
作者单位:College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, P. R. China; Department of Chemical and Environmental Engineering, Faculty of Engineering, The University of Nottingham, Nottingham NG7 2RD, UK
基金项目:国家自然科学基金,国家重点基础研究发展计划项目(973),E.OnAG公司 
摘    要:用电化学阻抗方法研究了铂片电极在BMIMPF6,BMIMBF4,BMIMClO4,BMIMTf2N,BMIMCl,BMIMBr,C3OHMIMBF4,C3OHMIMClO4和BMMIMPF6(BMIM:1-butyl-3-methylimidazolium;C3OHMIM:1-(3-hydroxypropyl)-3-methylimidazolium;BMMIM:1-butyl-2-methyl-3-methylimidazolium;Tf2N:bis(trifluoromethylsulfonyl)amide)等离子液体中的界面电容及结构.结果表明:当阴、阳离子半径相差不大且不存在特性吸附时,在零电荷电势附近,电极/离子液体界面的电容-电势曲线将出现电容单峰或者双峰.电极的零电荷电势对应于单峰的峰电势或者双峰之间的谷电势.当电极电势远离零电荷电势时,电极/离子液体界面成紧密层结构,可由紧密层理论来描述.如果存在离子的特性吸附,相应的电容峰可能不再出现,而表现为双层电容随电极电势对零电荷电势的偏离而单调增加.还研究了添加小的Li+离子对电极/离子液体界面电容的影响.通过向BMIMTf2N中加入LiTf2N,发现Li+离子可以改变电极/离子液体界面的双层结构,但无助于界面电容的提高,甚至可能引起电容的降低.最后探讨了不同条件下,尤其考虑阴阳离子特性吸附时,电极/离子液体的界面结构.

关 键 词:电化学电容  离子液体  电极/电解液界面  界面离子排列  电化学阻抗谱  
收稿时间:2009-11-27
修稿时间:2010-03-22

Capacitance at the Electrode/Ionic Liquid Interface
ZHAO Di HUANG Qing JIN Xian-Bo, WEI Xian-Jun CHEN George Z.,.Capacitance at the Electrode/Ionic Liquid Interface[J].Acta Physico-Chimica Sinica,2010,26(5):1239-1248.
Authors:ZHAO Di HUANG Qing JIN Xian-Bo  WEI Xian-Jun CHEN George Z  
Institution:College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, P. R. China; Department of Chemical and Environmental Engineering, Faculty of Engineering, The University of Nottingham, Nottingham NG7 2RD, UK
Abstract:The interfacial structure and capacitance of a Pt foil electrode were investigated by electrochemical impedance spectroscopy in various ionic liquids including BMIMPF6,BMIMBF4,BMIMClO4,BMIMTf2N,BMIMCl,BMIMBr,C3OHMIMBF4,C3OHMIMClO4 and BMMIMPF6(BMIM:1-butyl-3-methylimidazolium,C3OHMIM:1-(3hydroxypropyl)-3-methylimidazolium,BMMIM:1-butyl-2-methyl-3-methylimidazolium,Tf2N:bis(trifluoromethylsulfonyl)amide).The results indicate that when the anion and cation of the ionic liquid are of comparable size and do not...
Keywords:Electrochemical capacitance  Ionic liquid  Electrode/electrolyte interface  Interracial ion collocation  Electrochemical impedance spectroscopy
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