锗钨酸盐的电化学性能及GeW11Co/P-oPD/GC电极对过氧化氢的电催化还原

Electrochemical Properties of Tungstogermanate and Electrocatalysis Reduction of H_2O_2 on GeW_(11)Co/P-oPD/GC Electrode

研究了杂多酸-钴取代三聚Keggin结构锗钨酸盐([Co(H2O)3(α-GeW11CoO38)3]10-)的电化学性能.实验表明,在玻碳(GC)电极上,锗钨酸盐循环伏安曲线呈现2对可逆的氧化还原峰,峰电位差分别为31 mV和35 mV,各对应于2电子4质子和2电子3质子电极反应,其过程受表面吸附控制.经过电聚合将GeW11Co修饰于聚邻苯二胺(P-oPD/GC)电极表面,制得GeW11Co/P-oPD/GC电极.该电极对过氧化氢(H2O2)的还原有良好的电催化作用,且制作简便,性能稳定,响应快速.

The electrochemical properties of Co-substituted trimeric tungstogermanate（GeW11Co） containing Keggin fragments were studied.Cyclic voltammograms revealed two couples of reversible redox peaks on glassy carbon（GC） electrode in acid solutions.They corresponded to two-electron reductions accompanying by the additions of four protons and three protons,respectively,both were controlled by adsorption.The differences in the peak potentials of 2-electron-4-proton and 2-electron-3-proton reactions were 31 mV and 35 mV,respectively.Furthermore,the tungstogermanate modified GC electrode with functionalization by poly（o-phenylenediamine）（P-oPD） was prepared readily by electropolymerization.The GeW11Co/P-oPD/GC electrode could electrocatalyze the reduction of hydrogen peroxide,which showed good stability and quick response.