ELECTROCHEMICAL OXIDATION OF A METAL INVOLVING 2 SUCCESSIVE CHARGE-TRANSFER STEPS WITH ADSORBED INTERMEDIATE SPECIES .2. THEORETICAL EXPRESSIONS FOR ELECTROCHEMICAL IMPEDANCE SPECTRA

The theoretical expression for the electrochemical impedance of anodic oxidation of a metal in which two successive charge transfer steps oc cur and involving two adsorbed species has been established. An equiva lent electrical circuit has been given and the relationships between e lectrical and kinetic parameters were used for clearly discussing the dependence of the shapes of the impedance spectra upon potential and r elative values of kinetic parameters. In particular, the appearance of an inductive effect or a negative polarization relativistic is strong ly correlated with relative values of kinetic parameters and especiall y those of desorption steps. Copyright (C) 1996. Elsevier Science Ltd.