Effect of electrolyte cations on the charge transfer in films of Prussian blue

Charge transfer in films of Prussian blue is studied by cyclic voltammetry and chronoamperometry at potentials of first (PB/PW) and second (PB/PY) red ox processes in solutions of potassium, cesium, and ammonium nitrates (pH 4 .0). The current relaxation following a film perturbation by a small-amplit ude voltage pulse is analyzed with theoretical relationships obtained earli er for the charge transfer in redox polymers. Parameters, characterizing th e charge transfer rate (formal diffusion coefficient, instantaneous current ), are calculated and analyzed as a function of the film oxidation state an d the supporting-electrolyte nature.