Au/PAni/GC电极的制备及对甲醛的电催化氧化研究

应用循环伏安、恒电位阶跃等方法研究了在苯胺修饰的玻碳电极（PAni/GC） 表面金颗粒的电化学沉积及不同的制备方法对甲醛氧化电催化活性的影响。研究表 明，在PAni/GC电极表面，金的电沉积在初始阶段遵循扩散控制瞬时成核三维成长 模式。在碱性介质中，电解沉积法制备的电极比循环伏安法制备的电极对甲醛的催 化氧化有更高的催化电流。但是，在循环伏安法制备的电极上甲醛的氧化可以在很 负的电极电位下发生。

Preparation of Au/PAni/GC Electrode and Their Electrocatalytic Activity for the Oxidation of Formaldehyde

The electrodeposition of Au particles on the surface of glass carbon (GC) electrode modified with polyaniline (PAni) and the electrocatalytic activity for the oxidation of formaldehyde were investigated by cyclic voltammetry and potentiostatic step. The results show that at initial stages the electrocrystallization of Au on PAni/GC followed the mechanism of instantaneous three dimensional nucleation and diffusion-controlled growth. The electrode prepared by constant current electrodeposition has higher catalytic current than that prepared by cyclic voltammetric electrodeposition for formaldehyde oxidation in alkaline media while the latter has more negative electrocatalytic potential in the oxidation of formaldehyde.