Protonation and electrochemical redox doping processes ofpolyaniline in aqueous solutions: Investigations using insitu FTIR-ATR spectroscopy and a new dopingsystem

摘要: Polyaniline (PANI), one of the most interesting members the group conducting polymers, has been subject intense experimental and theoretical studies because its outstanding behaviour during electrochemical redox processes changes of pH. In this work doping protonation processes of PANI are described by using in situ FTIR-ATR and a new system NaReO 4 /HReO 4 . Cyclic voltammetry shows that above ca. pH 4 only wave response can be obtained. With increasing acidity electrolyte, a two-wave response develops, splitting waves occurring at pH ca. 3.5–4. By measurements during base–acid transition process, a distinct picture of protonation different forms A scheme for the dopant concentration, as function electrode potential and pH, is presented. The results show amount anions involved in dedoping depends on the potential. Maximum occurs intermediate oxidized metallic state. During both electronic structure polymer and also number protons bound to nitrogen atoms altered. The mechanisms under and acid–base conditions described.