Faradaic impedances and intermediates in electrochemical reactions

Abstract

When an intermediate species is involved in an electrochemical reaction and is adsorbed on the metal surface, the coverage most often depends on the potential. In this case, impendance measurements allow for the overall reaction to be split into elementary processes on the basis of different relaxation times. Theoretical models are given and checked by experiment for the dissolution of iron, the cupri-cuproloride reduction on an inert electrode and the reversible transition from active to passive state of iron.