Evaluation of the Activity of Binary PtM/C Alloy Catalysts Towards the (HOR) for PEMFCS

A comprehensive study of the investigations performed in search for development of electrocatalysts with enhanced catalytic activity and stability for low temperature polymer electrolyte membrane (PEM) fuel cells are presented. we evaluated the activity of binary PtM/C ( M = Ni,Mo,Ru,Co,Sn,W,Fe,….) alloy catalysts towards the Hydrogen oxidation reaction (HOR) .The comparison is done based on the potential difference in HOR. While the HOR kinetics on high surface area Pt catalyst is still sluggish, intensive researches have focused on the Pt alloyed catalysts, such as Pt-Co, Pt-W, Pt-Ru and Pt-Sn. It has been established that by alloying Pt with non-precious transition metals, the kinetics of the HOR can be significantly improved and the expense of catalyst can be reduced as well. The enhanced activity of the Pt alloys has been attributed to the electronic structure change and the geometric effects that facilitate the adsorption/desorption of the HOR intermediates The enhanced CO tolerance of the developed catalysts is strongly dependent on the type, composition and atomic ratios of the added elements/groups, and type and structure of the support materials.