ELECTROREDUCTION OF 1,4-BENZOQUINONE AND COBALTOCENIUM PERCHLORATE ONTHE OXIDIZED ELECTROINACTIVE POLYANILINE FILMS IN ACETONITRILE

Electroactivity losses of polyaniline films which result after the ano dic oxidation and the oxidation by the protonated form of superoxide a nion radical, HO2. were compared. It is shown that overoxidized polyan iline films behave differently depending on the method of overoxidizin g in acetonitrile. The reduction of 1,4-benzoquinone and cobaltocenium perchlorate on the anodically oxidized film revealed that the film do es not behave as an insulator and takes part in the electron transfer process. The film which is chemically oxidized by the protonated form of superoxide anion radical is not involved in the charge transfer and the electroreduction occurs on the underlying Pt surface which become s available for electron transfer as a result of the formation of the pores during the chemical oxidation.