Electrooxidation of beta-D(+)glucose on bare and upd modified platinum particles dispersed in polyaniline

Platinum particles dispersed in a polyaniline film (PAni/Pt) provide a bett er catalyst than smooth Pt for the electrooxidation of beta-D(+)glucose in perchloric acid aqueous solutions. The Pt particles are less sensitive to p oison formation than smooth platinum. Their catalytic activity is influence d by modification with underpotential deposition (u.p.d.) of thallium, lead or bismuth. Up to 0.4 V vs RHE the Pt particles show a better activity tha n u.p.d.-modified platinum particles. However, above 0.4 V the u.p.d,-modif ied particles are more active than bare Pt particles. Underpotential deposi tion of cadmium inhibits the electrooxidation of beta-D(+)glucose. The morp hology and the nature of the metallic dispersion were examined by transmiss ion electron microscopy.