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A systematic study of the influence of the type of electrochemical perturbation, in the presence of various salts, namely LiClO4, TBAClO4, TBAPF6, TEAPF6, LITFMS or TBATFMS in acetonitrile, on the electropolymerization of 3,4-ethylenedioxythiophene on platinum was accomplished. Poly(3,4ethylenedioxythiophene) (PEDOT) electrodeposits were electrochemically characterized in situ while prepared by cyclic voltammetry and constant potential techniques from solutions containing the monomer and each of the abovementioned electrolytes. nand p-doping/undoping processes (reversibility, stability and charge) and nucleation and growth mechanisms, that subsequently will be complemented and compared using conductivity measurements (four point probe method) and morphological characterization by SEM and AFM, were studied. It was verified that the volume of the supporting electrolyte ions and the waveform applied for the electrosynthesis, correlate directly with conductivity, morphology and reversibility, charge and stability of the generated polymeric coatings. Considering its likely aplication for the development of batteries, assessing by potentiodynamic method during 1000 cycles of charge/discharge in 0.10 mol L -1 LiCl aqueous solution, it was finally corroborated that films obtained from 5 voltammetric cycles in the presence of TBAPF6 are the most suitable candidates by showing, besides of reversibility, the greatest charge, with a stability larger than 95%. In any case, the results of this study allow selecting the electrosynthesis working conditions depending on the wanted application of the PEDOT modified electrode.

international journal of electrochemical science

Influence of the Supporting Electrolyte on the Electrochemical Polymerization of 3,4-Ethylenedioxythiophene. Effect on p- and n-Doping/Undoping, Conductivity and Morphology