Abstract
In fixed charge matrices the charge is commonly transported by a single ionic species. This situation is studied with a rotating ring-disk electrode system. An ion-exchange polymer film is deposited on the disk. Redox species leaving the polymer film are detected on the uncoated ring. The combined diffusion/migration mechanism of Fe(CN) 3− 6 transport across a poly(vinylpyridinium) film is demonstrated. It is shown that neglect of the effects of migration can lead to significant errors in the interpretation of the electrochemical results.
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