多晶铂电极在离子液体中的界面微分电容研究  

Interfacial Capacitance Measurements at Polycrystalline Pt/Room-Temperature Ionic Liquids Interface

作　　者：王艳玲[1] 杨靖[1] 周尉[1] 曹为民[1] 印仁和[1] 大内幸雄[2] 

机构地区：[1]上海大学化学系,上海200444 [2]名古屋大学化学系光物理化学研究室

出　　处：《复旦学报（自然科学版）》2012年第2期240-244,共5页Journal of Fudan University：Natural Science

基　　金：国家自然科学基金资助项目(21003088;20873083);上海市优秀青年教师基金资助项目(shu10017);上海大学创新基金资助项目;上海市教委第五期重点学科建设基金资助项目(J50102)

摘　　要：常温下用循环伏安法和电化学阻抗法研究了多晶铂电极在两种室温离子液体[BMIM]BF4,[EMIM]BF4(BMIM:1-butyl-3-methylimidazolium;EMIM:1-ethyl-3-methylimida-zolium)中的界面微分电容曲线.阻抗测量频率区间为10Hz到10kHz,得到的电容电势曲线既非抛物线形又非钟形.改变电势扫描方向测得的电容电势曲线形状不同,负向扫描曲线相对于正向扫描曲线会有延迟效应.这种延迟效应与离子在Pt电极上的吸附能和Madelung位能相关.Differential capacitance was measured at polycrystalline Pt /room-temperature ionic liquids （[BMIM] BF4, [EMIM]BF4, BMIM： 1-butyl-3-methylimidazolium; EMIM： 1-ethyl-methyl imidazolium） interface in a three-electrodes system at room temperature. Electrochemical impedance spectroscopic （EIS） measurements were performed in the frequency range from 10 kHz to10 Hz. The observed differential capacitance curves are neither parabolic nor bell-shaped. The shape of C - E curve changes with the direction of potential scanning. Compared with the positive going C-E curve, the negative going result shows significant hysteresis phenomenon. The reason leading to the hysteresis phenomena is due to both the surface bonding energy of ions and the Madelung energy among the ions.

关 键 词：界面电容 室温离子液体 电化学阻抗谱 吸附延迟效应 

分 类 号：O647.11[理学—物理化学]