镍纳米线电极的交流阻抗研究  

AC Impedance of a Nickel Nanowire Electrode

作　　者：孔景临[1] 薛宽宏[1] 何春建[1] 邵颖[1] 陈巧玲[1] 

机构地区：[1]南京师范大学化学系,南京210097

出　　处：《应用化学》2002年第4期313-316,共4页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金 (2 9973 0 14 );江苏省自然科学基金 (BK990 62 )资助项目

摘　　要：用交流阻抗法研究了一种新型电极——镍纳米线电极在碱性溶液中的电化学行为 ,给出了相应的等效电路和拟合结果 .实验结果表明 ,外加电位对电极表面化学反应速度和类型有显著影响 .在外加电位不高时 ,Ni( )氧化成 Ni( )的电化学过程随着电位的升高而明显加速 ;当外加电位高于 0 .40 V以后 ,电极表面同时发生电化学析氧反应 .相同条件下 。Electrochemical impedance spectra of a nickel nanowire electrode at different applied potentials and their fitting results are given. The experimental results revealed that the electro chemical processes on the surface of the electrode were apparently influenced by the applied potentials. The electrochemical oxidation rate of Ni(Ⅱ) to Ni(Ⅲ) increased remarkably with the applied potential at a range of 0 10~0 40 V( vs .Ag/AgCl(1 mol/L KCl)). When the applied potential was higher than 0 4 V, the oxygen evolution reaction occurred simultaneously. The AC impedance measurements on a nickel bulk electrode and a nickel nanowire electrode under the same conditions showed the latter had much greater electrochemical activity and much faster reaction rate in the surface processes.

关 键 词：镍纳米线 电极 交流阻抗 二次电池 镍氢电池 电化学行为 镍电极 正极 

分 类 号：TM912[电气工程—电力电子与电力传动] O646.5[理学—物理化学]