Pt/PAn/GC电极的制备及对甲酸电催化氧化性能的研究

Preparation of Pt/PAn/GC Electrode and Investigation of Electrocatalytic Oxidated Performance for Formic Acid on It

利用循环伏安法电聚合导电高分子聚苯胺,并制备了Pt/PAn/GC电极和Pt/GC电极,优化了苯胺在玻碳电极上的聚合条件,用在H2SO4中的循环伏安曲线对其进行了表征,Pt/PAn/GC电极的制备提高了Pt的分散度,增加了催化剂Pt的利用率。实验结果表明Pt/PAn/GC电极对甲酸电氧化的催化活性明显高于Pt/GC电极和Pt电极,正向扫描和反向扫描时对应的氧化峰电位分别是0.68V、0.45V,峰电流为54.23mA/cm2和84.23mA/cm2,为Pt/GC电极的修饰电极1.7倍和1.9倍,为Pt片电极的3.8倍和4.9倍,有效地提高了铂微粒的催化活性,并得到聚合苯胺的最佳条件为扫描速度50mV/s、扫描上限1.2V。

Polyaniline electropolymerized onto glassy carbon electrode by circlic voltammetric method, and Pt/PAn/GC and Pt/GC was prepared. The aniline electropolymerized conditions onto glassy carbon electrode were optimized. The decorated electrode was characterized by cyclic vohammogram curves in H2SO4 solution. Preparation of Pt/PAn/GC was found to have a significant bearing on separation of the platinum particle, which increases the level of platinum utilization in systems. The circulation vohampere experiment indicated that catalyzed performance of Pt/PAn/GC electrode for formic acids electrooxidation is better than Pt/GC and platinum foil. The oxidized peak volt of formic acid for the scaning and the reverse scaning on Pt/PAn/GC electrode was 0. 68V and 0.45V. The oxidized peak current was 54.23mA/cm^2 and 84.23mA/cm^2, it was 1.7 times and 1.9 times than that on Pt/GC and 3.8 times and 4.9 times than that on Pt electrode. The use ratio of platinum was effective improved. The aniline electro- chemical polymerization conditions were that the scan rate was 50 mV/s and the upper limit volt was 1.2V.