Charge transfer processes in conducting polymer films

Abstract

The available models of charge transfer processes in The available models of charge transfer processes in electroactive polymer films are considered. Examples of interpre-electroactive polymer films are considered. Examples of interpretation of the data of electrochemical measurements using model tation of the data of electrochemical measurements using model approaches are given. The emphasis is placed on the interpretation approaches are given. The emphasis is placed on the interpretation of the results on the impedance of modified electrodes. On this of the results on the impedance of modified electrodes. On this basis, conclusions concerning the most topical research problems basis, conclusions concerning the most topical research problems and the description of the processes in question are drawn. The and the description of the processes in question are drawn. The bibliography includes 122 references bibliography includes 122 references. . V V Malev, V V Kondratiev .ru (V V Malev), vkondrat@rbcmail.ru (V V Kondratiev)

Subdiffusion behavior in poly(3,4-ethylenedioxythiophene): Polystyrene sulfonate (PEDOT:PSS) evidenced by electrochemical impedance spectroscopy

“…At sufficiently high frequencies the width of the ionic diffusion wave produced by the ac signal is smaller than the thickness of the PED-OT:PSS film and, as a result, the Warburg behavior ($45°) is obtained. As the frequency decreases, the concentration of the diffusing ions increases at the far end of the film where complete blocking occurs [3,8] (vertical line in the Nyquist plot). Therefore, the doping kinetics is limited at sufficiently low frequencies.…”

“…Although the PEDOT:PSS film is a mixed electronic/ion conductor, electron transfer is much faster than ion diffusion [10,14] and it is reasonable to assume that electrical charge transfer is controlled by ion diffusion in the polymer [3]. Consequently, we consider that the impedance of the CP/electrolyte system may be expressed only as ion diffusion for the range of frequencies measured.…”

“…[3]. A common feature in the impedance spectra of CPs applied as coatings on metallic electrodes is a shift in the phase angle from $45°( Warburg-type response) to $90°(capacitive behavior) at sufficiently high and low frequencies, respectively [3].…”

The Charge Transport Process at Polyorthoaminophenol Film Electrodes

“…Electron hopping is believed to be the mechanism for electron transport, but it is also possible that ion motions may partially or totally control the rate of charge transport. Thus, the chargetransport rate in electroactive polymer films is quantitatively characterised by a heterogeneous constant of charge transfer and an effective (or apparent) diffusion coefficient for charge transport across the film [11,12]. The factors governing the magnitude of these parameters are not well understood.…”

Deactivation of Poly(o-Aminophenol) Film Electrodes After their Interaction with Ferric Cations. A Study Applying Interfacial Resistance Measurements~!2010-01-22~!2010-03-10~!2010-04-06~!

“…Combinations of different techniques, such as, cyclic voltammetry, spectroscopies and conductivity measurements, have supplied valuable information about the ionic and electronic charge transfer and transport processes in these materials [1][2][3]. These last techniques have contributed to the establishment of the chemical reaction mechanism during the redox process of some polymer materials.…”