Ag与Ag_2O粉末微电极的循环伏安和电化学阻抗对比研究  

Compared Study on Silver and Silver Oxide Powder Microelectrodes by Cyclic Voltammetry and Electrochemical Impedance Spectroscopy

作　　者：张永强[1,2] 王瑾[1] 

机构地区：[1]河南教育学院化学与环境学院,河南郑州450046 [2]郑州大学化学与分子工程学院,河南郑州450001

出　　处：《河南教育学院学报（自然科学版）》2014年第2期6-8,12,共4页Journal of Henan Institute of Education(Natural Science Edition)

基　　金：河南省自然科学基金项目(132102210161)

摘　　要：在Ag电极化成为AgO时,发现只有Ag粉末电极可以氧化得到AgO,而Ag2O则不行.分别将Ag和Ag2O制作成粉末微电极,对它们进行了循环伏安(CV)和电化学阻抗谱(EIS)测试.通过对测试结果的分析可知,Ag被氧化为Ag2O后,Ag电极分为内外两层,外层为富含离子通道的Ag2O,便于OH-的进入;内层为导电性良好的Ag,便于Ag2O氧化为AgO时电子的输出.而Ag2O电极所含的离子通道较少,不利于OH-的进入;另外Ag2O的电阻较大,也不利于电子向外输出.这两方面原因使得Ag2O电极不能被氧化为AgO.On making AgO electrode, only Ag powder electrode can be oxidized to AgO, but Ag20 powder electrode can not. Ag and Ag20 powder microelectrodes are made to measure their cyclic vohammetry plots and electrochemical impedance spectroscopy. By analyzing the test results, we know that after Ag is oxidized to Ag20, the silver electrode is divided into two layers. The outer layer is silver oxide rich in ion channels, which is convenient for OH-to enter; the inner layer is silver with good conductivity, which is convenient for the electron to output when Ag20 is further oxidized to AgO. The Ag20 electrode contains little ion channels, which is not conducive for more OH - to enter; the resistivity of the Ag20 is large, which is not conducive for the electron to output. These two reasons make the Ag20 electrode not to be oxidized to AgO.

关 键 词：AG AG2O CV EIS 微电极 

分 类 号：O646.5[理学—物理化学]