乙醇在铂和钯电极上的电化学氧化比较

Performance Comparison of Ethanol Oxidation on Pt and Pd Electrodes

摘要: 用循环伏安和计时电量法研究了乙醇在Pt和Pd电极上的电化学氧化活性。用不同扫描速度下的循环伏安研究得出乙醇在Pt和Pd电极上的电化学氧化都是扩散控制的不可逆反应。用计时电量法研究乙醇在Pt和Pd电极上的电化学氧化时，发现不同电位下失电子数是不同的，在Pt电极上在–0.30 V有最大值，在Pd电极上在–0.35 V有最大值，这个结果说明乙醇在Pd电极上比在Pt电极上更容易被电化学氧化。 The oxidation activity of ethanol on Pt and Pd electrodes has been studied by cyclic voltammogram and chronocoulometry in alkaline medium. The cyclic voltammogram with different scan rate shows that ethanol elec-trooxidation is an irreversible charge-transport and controlled by a diffusion process on all electrodes. The chronocou-lometry shows that the number of transfer electrons for ethanol oxidation changes with different potential. The number of transfer electrons is the highest value at –0.30 V on the Pt electrode and –0.35 V on the Pd electrode. The result shows that ethanol is more easily to electrochemically oxidize on the Pd electrode than that on the Pt electrode.