Pt电极上1,2-丙二醇吸附和氧化过程的EQCM研究

Adsorption and Oxidation of 1,2-PropaanedioI on Pt Electrode Using Cyclic Voltammetry and EQCM

运用电化学循环伏安法(CV)和电化学原位石英晶体微天平(EQCM)方法研究了0.1mol·L^(-1)H_2SO_4溶液中1,2-丙二醇在Pt电极上的吸附和氧化过程。结果表明:1,2-丙二醇电氧化行为与电极表面氧物种有着密切关系,正向电位扫描中1,2-丙二醇在Pt电极上氧化产生三个氧化电流峰,而一元醇的氧化仅产生二个氧化峰,说明1,2-丙二醇在Pt电极上电氧化过程的复杂性;负向电位扫描中1,2-丙二醇氧化出现阳极支与阴极支相互交错的伏安行为,表明1,2-丙二醇在Pt电极上氧化遵循双途径过程。本文还从表面质量变化的角度提供了1,2-丙二醇反应机理的新数据。

The processes of adsorption and oxidation of 1, 2-Propaanediol on Pt electrode was studied by using Cyclic voltammetry and electrochemical quartz crystal microbalance(EQCM). CV curves illustrated that the oxidation of 1,2-Propaanediol occurs in three oxidation peaks in the positive-going potential sweep and one large oxidation peak in the negative-going potential sweep. It was revealed that the oxidation of 1,2-Propaanediol depends strongly on oxidation states of electrode surface and 1,2-Propaanediol was oxidized on Pt electrode in acidic media via a dual path reaction mechanism. The EQCM studies provided quantitative results of surface mass variation during 1, 2-Propaanediol oxidation, and have thrown new light in elucidating Pt electrode surface towards 1, 2-Propaanediol oxidation.