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

Platinum particles dispersed in a polyaniline film (PAni/Pt) provide a better catalyst than smooth Pt for the electrooxidation of beta-D(+)glucose in perchloric acid aqueous solutions. The Pt particles are less sensitive to poison formation than smooth platinum. Their catalytic activity is influenced 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 than u.p.d.-modified platinum particles. However, above 0.4 V the u.p.d,-modified particles are more active than bare Pt particles. Underpotential deposition of cadmium inhibits the electrooxidation of beta-D(+)glucose. The morphology and the nature of the metallic dispersion were examined by transmission electron microscopy.