用磷钼酸修饰甲醇燃料电池的铂电极

Phosphomolybdic Acid Modified Platinum Electrode of Methanol Fuel Cell

近年来以杂多化合物为基础的催化体系受到广泛的关注。为了研究杂多酸与铂电极对甲醇电催化氧化的协同效应,通过循环伏安扫描法制备了磷钼酸(H3PMo12O40)修饰铂电极。通过循环伏安和计时电流法研究了该修饰电极对甲醇氧化的电催化活性和抗中间产物的毒化作用,并比较了该修饰电极与其单酸盐(Na2MoO4)修饰铂电极的性能,测试结果表明:磷钼酸修饰铂电极能够提高对甲醇氧化反应的催化活性,基本上同其单酸盐Na2MoO4修饰铂电极的催化活性相当,并且这种促进作用主要是由Mo原子价态变化引起的。同时计时电流曲线测试结果表明,该修饰电极具有一定的抗毒化作用,但不如钼酸钠好。

In order to investigate the co-effect of heteropoly acid and Pt electrode on methanol electrooxidation, phosphomolybdic acid （H3PMo12O40） modified Pt electrode was prepared by cyclic voltammetry . The electrocatalytic activity for methanol oxidation and the anti-poison ability against the mid-product of the methanol oxidation were studied by cyclic voltammetry and chronoamperometry. Also the performance of this modified electrode was compared with sodium molybdate modified platinum electrode. The cyclic voltammetry tests show that phosphomolybdic acid modified platinum electrode can increase the catalytic activity for methanol oxidation and it is almost the same as the mono-molybdate （Na2MoO4） modified Pt electrode does. This promote effect mainly comes from the transformation of different valency of molybdenum. The chronoamperometry tests show that the modified electrodes exhibit strong anti-poison ability, but it is weaker than that of electrodes modified by sodium molybdate.