A SIMPLIFIED APPROACH TO THE MODELING OF WAVE-PROPAGATION AT ELECTRODE-ELECTROLYTE INTERFACES

A simple model is developed to describe wave phenomena at electrode/el ectrolyte interfaces. The electrochemical kinetics include a negative faradaic impedance in order to provide the necessary feedback between the interfacial faradaic current and the local currents flowing in the electrolyte solution. The properties of the model are studied under c onditions of fixed current or fixed potential, and in the absence or p resence of a supporting electrolyte. Depending on the conditions, the model is shown to give rise to front propagation, pulse propagation, w ave trains and spiral waves. The relation with the experimentally repo rted cases of wave propagation at electrode/electrolyte interfaces is discussed to some extent.