溶液酸度对铂电极上甲醇氧化的影响

用循环伏安法研究在不同酸度的硫酸钠溶液中,甲醇在铂电极上氧化的电化学行为。结果表明:溶液的酸度基本上不影响甲醇在铂电极上的氧化特性,甲醇的氧化峰电位变化不大,电位正向和反向扫描时,甲醇氧化峰电位分别在0.17V和-0.03V(相对于Hg/Hg2SO4参比电极)左右。但是溶液的酸度对甲醇在铂电极上的氧化速度却有较大影响,酸度越低,速度越快,这种情况可用铂在不同酸度溶液中,铂氧化物的形成差异得到解释。

Effect of solution acidity on methanol oxidation for platinum electrode

The electrochemical behavior of the methanol oxidation on the platinum electrode with different concentration H2SO4 solution was studied by using cycl ic voltammetry. The solution acidity scarcely affected the oxidation characteris tic of methanol on platinum. The peak potentials for methanol oxidation changed little, and reached 0.17 V and -0.03 V(vs. Hg / Hg2SO4) for potential forward an d backward scan respectively. However, the solution acidity affected the rate of methanol oxidation on platinum. The current of methanol oxidation increased wit h the decreasing of the solution acidity. This phenomenon could be explained by the difference of the formation of platinum oxide on platinum.