ELECTROCATALYTIC PROPERTIES OF TI2NI NI-MO COMPOSITE ELECTRODES FOR HYDROGEN EVOLUTION REACTION/

A composite electrode as hydrogen cathodes composed of Ti,Ni hydrogen absorbing alloys and a Ni-Mo electrocatalyst was prepared for alkaline water electrolysis. The electrocatalytic properties of hydrogen evolu tion reaction (HER) are carried out in a 30 wt% KOH solution at 70 deg rees C. The surface morphology and chemical composition of the cathode were also examined. The experimental results show that the composite cathode has a low hydrogen overpotential (ca. 60 mV at 70 degrees C in 30 wt% KOH) and excellent stability under conditions of continuous el ectrolysis and intermittent electrolysis with power interruption shutd own. The stability mechanism of the cathode against intermittent elect rolysis is discussed. (C) 1997 International Association for Hydrogen Energy.