Abstract
The effects of electrochemical systems non-linearities on impedance measurements with a Frequency Response Analyser have been investigated in low frequency domain from both a theoretical and experimental viewpoint. A theoretical expression for the polarization resistance measurement error has been found for “non-blocking” electrodes and the measurement validity conditions have been examined. The theoretical approach has been applied to redox reactions and to an adsorbed phase reaction which is a dissolution-passivation process of a metal. The theoretical results were verified with impedance measurements on a platinum rotating disk electrode in a Fe(CN) 3- 6/Fe(CN) 4- 6 redox solution.
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