A phenomenological model for macroscopic deactivation of surface processes

There is a wide class of electrochemical systems which present a sudden transition from a high to a low reaction rate region in function of an external parameter. This sudden transition is accompanied by the growth of a surface structure responsible for deactivation of the process. Analysing a simple phenomenological model of a generic surface process shows that the growth of this deactivating structure implies a hysteresis according a forward and reverse scan in the external control parameter. Application to water electrolysis, metal passivation and ethylene oxidation on Rh/TiO2/YSZ under open-circuit and under electrochemical promotion is discussed.


Published in:
Electrochemistry communications, 6, 1199-1205
Year:
2004
Keywords:
Laboratories:




 Record created 2006-06-02, last modified 2018-03-17


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