A study on the electrodic process by electrochemical impedance spectroscopy

Electrochemical impedance spectroscopy measurements yield a lot of informat ion on the electrochemical process at the interface electrode/electrolyte. The paper deals with the study of the electrodic reaction of the Fe3+ / Fe2 + system on a SnO2 based electrode. Impedance spectra analysis yielded that the determinative stage of the electrodic process in the charge transfer t hrough the electric double layer and that the electrocathalytic properties of the SnO2 based electrode are weaker than that of the platinum electrode, but are adequate for the Fe3+ / Fe2+ system.