The faradaic admittance of electrochemical processes : III. The frequency dependence

Abstract

Recent experimental studies have demonstrated the inadequacy of proposed equations for the faradaic admittance, particularly in respect to the frequency dependence. Existing treatments of the faradaic admittance can give rise to two contradictory equations for the frequency dependence, these equations being identical only at very low frequencies. The difference between these conflicting equations has a counterpart in the different behavior of two types of systems, which arise from the fact that either oxidation or reduction may be preferentially affected by polarization effects. Previous experimental results on the variation of the faradaic admittance with frequency can be qualitatively interpreted on this basis.