Sm^(3+)对甲醇电化学氧化反应的助催化作用

Studies on Promoting Catalysis of Sm^(3+) Towards Oxidation of Methanol on the Pt Electrode

分别以相同面积的光滑 Pt电极和吸附了 Sm3+ 的铂电极作为工作电极 ,在酸性介质中采用循环伏安法对甲醇氧化进行测定 .结果表明 ,吸附了 Sm3+ 的 Pt电极上产生了更大的氧化电流 ,表明 Sm3+ 的加入对甲醇的电催化氧化起到了促进作用 .这一研究结果在直接甲醇燃料电池 ( DMFC)

Electrocatalytic performance of Sm 3+ adsorbed on the smooth surface of Pt electrode toward the oxidation of methanol has been studied. The experimental results show that Sm 3+ has a high promoting catalysis for electrocatalytic oxidation of methanol in electrolyte. According to the positive experimental data(cyclic voltammograms) and the theoretical analysis, one coordination complex Pt-Sm 3+-CH 3OH may be formed and acted as a critical intermediate during the reaction of methanol oxidation. Some in-situ spectral characterizations are in the process to confirm the existence of the complex. The mechanism of promoting effect of Sm 3+ toward the electrocatalytic oxidation of methanol was deduced.