Mesure de l'impedance faradique pour l'etude de mecanismes EC. Application a l'oxydation de la N,N-dimethyl-p-phenylenediamine

Faradaic impedance measurements have been used to study an EC mechanism involving an irreversible chemical reaction. This technique has proved quite successful to determine kinetic constants ranging from 1 to 10³ s^?1. It has been applied to the hydrolysis reaction, in basic aqueous media, of theN-N-dimethylquinone-diimine resulting from the electrochemical oxidation of the N,N-dimethyl-p-phenylenediamine. The kinetic constant has been determined from pH values 10.5 to 12.5.