Effect of composition change in the ternary PdIrY alloy on the activity towards oxygen reduction reaction

Abstract

Pd-based catalysts have been studied to replace the Pt catalyst. To increase the activity for oxygen reduction reaction (ORR), transition metals that give strain and electronic effects were incorporated to form an alloy. It is revealed previously that Ir enhances durability and catalyst activity when decorated into the Pd alloy. Amount of Y in the ternary PdIrY alloy catalyst is investigated for improved ORR activity. The Pd4IrY/C showed the best specific activity and mass activity, 0.812mA/cm2 and 0.324A/mgPd at 0.6V, which is attributed to the result of simultaneous strain and electronic effects of Ir and Y