Abstract
On the basis of a detailed description of the kinetics of oxygen reduction in alkaline solution on cobalt phthalocyanine film electrodes, a mechanism of the electrocatalysis of this reaction is proposed. The main features of this mechanism are those of a redox catalysis scheme, where the central metal atom of the electrocatalyst releases an electron to the adsorbed reactant (O 2 and, at high overpotential, HO 2 −), which is subsequently further reduced to products (HO 2 − and OH − respectively). The influence of the redox state of the electrocatalyst is explained in terms of a tentative description of the difference of the interaction of the electrocatalytic site with the respective depolarizers O 2 and HO 2 −. The proposed model gies a satisfactory explanation of the observed kinetics of the reactions involved, as well as the observed correlations between electrocatalytic activity and properties such as phthalocyanine redox potentials.
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