氢钼青铜修饰铂电极对甲醇氧化的电催化作用

利用循环伏安法研究了氢钼青铜在铂电极上的修饰作用和修饰铂电极在c(H2 SO4 ) =0 5mol/L溶液中对甲醇的催化作用。研究结果表明 :铂电极因钼酸盐的还原和钼青铜的氧化而得到修饰 ,低电位范围内修饰铂电极对甲醇的氧化有催化作用 ,催化氧化电流是未修饰电极上的1 6倍。酸性条件下 ,含高价态钼的钼青铜不稳定 ,会不断溶解对铂失去修饰作用 ,对甲醇的氧化效果与未修饰铂电极上的效果相同 ;而低电位时 ,钼青铜修饰铂电极则相对稳定

Electrocatalytic Oxidation of Methanol on Platinum Electrode Modified by Hydrogen Molybdenum Bronze

The modification of platinum electrode by hydrogen molybdenum bronze and the electrocatalytic oxidation of methanol on the modified electrodes in 0 5 mol/L H 2SO 4 solution were studied by cyclic voltammetry.The results showed that the platinum electrode was modified and the modified electrode catalyzed the oxidation of methanol,the highest oxidation current on the modified electrode being 1 6 times that on the unmodified electrode.Hydrogen molybdenum bronze with high valence molybdenum was unstable in H 2SO 4 solution and disappeared gradually from the electrode as the electrode was scanned repeatedly in potential range of -0 2-1 3 V(vs.SCE).However,hydrogen molybdenum bronze at lower potential is relatively stable.