铂微粒修饰的聚苯胺薄膜电极对甲醛氧化的电催化作用

Electrocatalytic Effect of Polyaniline Film ElectrodeModified by Platinum Microparticles onOxidation of Formaldehyde

以电位扫描法把铂微粒沉积在聚苯胺（ＰＡｎ）薄膜电极上以制得铂微粒修饰的聚苯胺薄膜电极．该电极的催化活性以甲醛在０．５ｍｏｌ／Ｌ 硫酸溶液中的电化学氧化测定．它集催化活性和电活性于一体，对甲醛在酸性介质中的电化学氧化显示了非常高的电催化活性，较之裸铂电极、ＰＡｎ薄膜电极，其催化电流提高１０倍。铂微粒的大小、分布和载量，甲醛的浓度，基体金属的种类等因素对电极材料的催化活性均有影响。

The polyaniline film electrodes incorporated with platinum microparticles by cyclicpotential sweep were prepared and the electrocatalytic activity and stability were studied onoxidation of formaldehyde in 0.5mol/L H_2SO_4. The electrodes which combine both electroac-tivity and catalytic activity exhibit a very high electrocatalytic activity for oxidation offormaldehyde in aqueous acidic solution. The catalytic currents at the platinum microparticlemodified polyaniline electrode were ten times larger than those at naked platinum electrode.The catalytic activity depends strongly on the size,distribution and amount of the loadedplatinum microparticles, as well as on the concentration of formaldehyde and the electrodematerial.