Electrochemical behavior of platinum-modified polyaniline films in sulfuric acid solutions of carbon monoxide

On the Pt-PAN-CC and PAN-Pt electrodes in H2SO4 solutions that are first sa turated with CO and then rid of it, during anodic scans of E-r, oxidation p eaks are observed at 0.85-0.95 V, which disappear only after repeatedly cyc ling E-r in the interval 0.65 to 1.1 V. The effect is attributed to the cap ability of a PAN film to sorb considerable CO amounts. The sorption interac tion is of a chemical nature. The electrooxidation of CO in the film is clo sely related to the PAN oxidation, which results in its destruction.