Cyclic Voltammetry of Mixed Metal Electrodes

Abstract

Repetitive potentiostatic triangular voltage sweeps cause a significant change in the surface structure and catalytic activity of mixed metal fuel cell electrodes. For the particular case of a platinum‐rhodium black electrode, each successive cycle causes a decrease in the platinum oxidation and reduction peaks with a proportionate increase in the rhodium oxidation and reduction peaks. The complete elimination of the platinum peaks is related to the resistance of an electrode to CO poisoning. A possible mechanism of the above behavior along with data on other mixed metal electrodes is presented.