MnO_2电极的循环伏安光电化学测量

A PHOTOELECTROCHEMICAL STUDY OF CYCLIC VOLTAMMETRY OF MnO_2 ELECTRODE

用循环伏安法的光电化学现场测量研究了γ-MnO_2在充放电过程中的电化学和光电化学性质,γ-MnO_2本身的光电流为正值,在阴极还原过程中光电流不断减小,由正值变为负值。说明γ-MnO_2是n型半导体,阴极还原过程相当于对γ-MnO_2进行了p型掺杂。

Electrochemical and photoeletrochemical properties of electrodepositing γ-MnO_2 are studied when it is charged and discharged in 1 mol·L^(-3) KOH using cyclic voltammetry and in-situ photoelectrochemical method. When γ-MnO_2 is reduced,the photocurrent decreases from positive to negative. We concluded that γ-MnO_2 is a n-type semiconductor,but it is p-type doped during the reduction processes.