Electrooxidation of ethylene glycol on Pt-based catalysts dispersed in polyaniline

Platinum dispersed in a polyaniline him is a better catalyst than smooth Pt for ethylene glycol electrooxidation in perchloric acid aqueous solutions. The catalytic activity of the platinum microparticles is further enhanced when Ru, Sn or both are codeposited. The PAni/Pt-Sn assembly shows the high est electrocatalytic activity of the electrodes examined. Underpotential de position of Tl and Pi on dispersed Pt inhibits EG electrooxidation while Pb causes significant catalysis only with a specific preparation method elect rocatalyst. The morphology and the identity of the metallic dispersion is e xamined by transmission electron microscopy.