Thin films of polypyrrole-ferrocyanide have been characterized using a rotating ring-disk electrode. It has been shown that the total amount of ferrocyanide is removed from the system in the first reduction-oxidation cycle if an appropriately low potential is applied during polypyrrole polymerization. If the polymerization potential reaches higher values than 0.6 V versus SCE in aqueous solutions, a significant irreversibility of the redox reaction results, leading in turn to the existence of non-removable anions in the polymer film. The linear relationship between the amount of released dopant registered at the ring and the film thickness indicates a homogeneous distribution of the dopant within the polypyrrole matrix. © 1987.
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