Regularities of electrochemical behavior of polyaniline doped by electroactive anions

Electrochemical potentiodynamic and potentiostatic synthesis is used to obtain polyaniline (PANI) modified by new electroactive anions: organic dianion of the diammonium salt of 2,2′-azinobis(3-ethylbenzothiazoline-6-sulfo acid) (ABTS) and inorganic ammonium hexachloroiridate dianion IrCl ₆ ^2? (HCI). Electrochemical behavior of the modified PANI-ABTS and PANI-HCI polymers is studied by means of the meth ods of cyclic voltammetry (CV) and charge-discharge dependences. It is shown that modified PANI-ABTS and PANI-HCI remain electroactive at much higher potential sweep rates as compared to PANI doped by HSO ₄ ^? (PANI-sulfo). Electrochemical capacity values are calculated on the basis of the data of CVs and discharge curves and coulombic efficiency of the new polymers that exceeds significantly the corresponding values for PANI-sulfo. This effect is enhanced when the ABTS and HCI additives are introduced into the supporting electrolyte in all electrochemical processes.