聚苯胺修饰电极对甲醇的电催化氧化研究

Study of Electrocatalytic Oxidated Performance for Methanol on Pt/PAn/GC Decorated Electrode

应用电化学方法制备了Pt/PAn/GC电极,优化了苯胺在玻碳电极上的聚合条件,并对其进行了表征。结果表明,铂微粒在聚苯胺膜电极上具有很高的分散度,电极具有很大的比表面积,Pt/PAn/GC电极对甲醇电氧化的催化活性明显高于Pt/GC电极和Pt电极,在该电极上甲醇正向扫描和反向扫描时的氧化峰电流为58.68mA/cm2和50.00mA/cm2,为Pt/GC电极的1.6倍和1.7倍,为Pt电极的3.0倍和3.1倍,从而有效地提高了铂的催化活性,并得到在玻碳电极上聚合苯胺的最佳条件为扫描速度50mV/s,扫描上限1.2V。

The Pt/PAn/GC electrode was prepared with the circlic voltammetry.The aniline electrochemical polymerization conditions were optimized.The decorated electrode was characterized by cyclic voltammogram curves in H2SO4 solution.It was found that the platinum particle evenly dispersed in the electrode surface.The electrode has a very big relative surface.The circulation volt-ampere experiments indicated that catalyzed performance of Pt/PAn/GC electrode for methanol's,electrooxidation is better than Pt/GC and platinum foil.The oxidized peak current of methanol for the scaning and the reverse scaning on Pt/PAn/GC electrode was 58.68mA/cm2 and 50.00mA/cm2.It was 1.6 times and 1.7 times than that on Pt/GC and 3.0 times and 3.1 times than that on pure 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 was 1.2V.