Electrocatalytic oxidation of methanol and formic acid on dispersed electrodes: Pt, Pt-Sn and Pt/M(upd) in poly(2-hydroxy-3-aminophenazine)

Platinum particles dispersed in a poly(2-hydroxy-3-aminophenazine) film (pH APh/Pt) provide a better catalyst than smooth Pt for the electrooxidation o f methanol and formic acid in perchloric acid aqueous solutions. The cataly tic activity of the Pt particles is further enhanced when Sn is codeposited in the polymer film. In the case of formic acid oxidation, the activity of Pt nanoparticles is influenced by adatoms of Tl, Pb and Bi deposited undep otential conditions. The upd-modified Pt particles are much more active tha n bare Pt particles. The morphology and identity of the metallic dispersion were examined by transmission electron microscopy.