A thermodynamic analysis of the potential distribution in an equilibrium galvanic curcuit with a conducting polymer film electrode permeable for anions has been carried out. The distribution of the total potential difference between two interfaces (metal-polymer and polymer-electrolyte solution) and, hence, the dependence of concentrations of all charged redox forms on the potential E are determined by the type of charged from that prevails in the polymer film (of polaron or bipolaron type, in particular). We consider a galvanic curcuit containing a metal current collector coated with a conducting polymer film immersed in electrolyte solution. The overall cell potential at null current, for simplicity, is measured against an electrode reversible with respect to cations in the same solution: [GRAPHICS] There exists equilibrium on the reference electrode: [GRAPHICS] The doping-dedoping processes are expressed by the equations: [GRAPHICS] Here M+ and A- are electrolyte ions, e- is electron in metal or polymer; PT-degrees is reduced form of polymer. Subscripts m, s and p indicate the phase in which the given component is contained: metal, solution and polymer respectively. Two particles correspond to the oxidized form of polymer: mobile polaron PT+ and "bound" polaron PT+ A- (the influence of other charged redox forms is considered in [1]). The electronic-ionic equilibrium ensures local electroneutrality everywhere inside the polymer film bulk. The problem is to express the concentration of all the components forming part of the polymer phase in terms of the concentrations of ionic solution components and the electrode potential E.
