甲醇在聚苯胺修饰分散铂电极上的电催化氧化

Electrocatalytic oxidation of methanol on polyaniline-modified dispersed platinum particle electrode

用循环伏安法和恒电位法在铂电极上分别制备了分散铂电极、聚苯胺修饰电极及聚苯胺修饰分散铂电极。并用循环伏安法研究了制备电极在0.5mol/LH2SO4溶液中的电化学行为以及对甲醇氧化的催化行为。分散铂电极对甲醇氧化的最大电流是4.29mA,是基体电极(0.069mA)的62.2倍。聚苯胺修饰分散铂电极对甲醇氧化的最大电流(10.2mA)是基体电极的148.0倍,分散铂电极的2.4倍。分散铂对甲醇氧化的催化作用不仅仅是铂面积增大的结果,还存在纳米效应。聚苯胺修饰铂电极对甲醇氧化的催化除存在铂进一步分散使面积进一步增大的因素外,还存在铂与聚苯胺的协同作用。

Dispersed platinum particle electrode, polyaniline electrode and polyanilinemodified platinum dispersed particle electrode were prepared by cyclic voltammetry and potentiostatic methods. The electrochemical behaviour of the electrodes in 0.5 mol/L H2SO4 solution and the oxidation of methanol on them were studied by cyclic voltammetry. The maximum oxidation current of methanol on the dispersed platinum particle electrode is 4.29 mA, which is 66.2 times higher than that on the base platinum electrode. However, the maximum oxidation current of methanol on the polyanilinemodified dispersed platinum particle electrode is 10.2 mA, which is 148.0 and 2.4 times higher than that on the bold electrode and the dispersed platinum particle electrode respectively. The electrocatalysis of methanol on the dispersed platinum particle electrode is ascribed to the increasing of the electrode area and nanoeffect due to the microparticles. The electrocatalysis of methanol on the polyanilinemodified dispersed platinum particles electrode is abscribed to further dispersion of particles by polyaniline as well as the synergistic effect between polyaniline and the platinum particles.