Electrocatalytic activity of platinum-polyaniline and palladium-polyaniline systems obtained by cycling the electrode potential

Steady-state current densities of electrooxidation of CH,OH, HCOOH, and CO at the Pt-PAN-CC electrodes (where PAN and GC stand for polyaniline and gla ssy carbon, respectively) and those of electrooxidation of HCOOH at the Pd- PAN-GC electrodes are measured (per cm(2) of the true metal-catalyst surfac e area). The found higher activity of Pt and Pd particles incorporated in P AN, as compared with Pt/Pt and Pd/Pt, is attributed to interaction between metal-catalyst particles and the polymeric matrix. The activation effect is the most pronounced for the HCOOH electrooxidation at Pd-PAN-GC. The data concerning hydrogen evolution testify in favor of a decrease in exchange cu rrents of this reaction upon going from Pt to Pt-PAN-CC electrodes.