CONDUCTING-POLYMER FILMS DOPED WITH POLYMOLYBDATE ANIONS - SYNTHESIS AND INVESTIGATION

Effects of polymolybdate on pyrrole and aniline electropolymerization and electrochemical performance of polymer films containing polymolybd ate anions as dopants are investigated with the cyclic voltammetry met hod. The number of molybdenum atoms in the polymolybdate anion, which is predominantly contained in the electrolyte and is incorporated into the synthesized polymer film as a doping agent, depends on the ratio of the acid and molybdenum concentrations. Polymolybdate has been show n to accelerate the film growth and extend the redox capacity of the f ilm. These two effects are due to high electrochemical activity of pol ymolybdate. During the process of polymer-film cycling, the polymolybd ate anion is easily removed out of polypyrrole into electrolyte but re mains firmly immobilized in polyaniline, presumably forming a complex with the latter.