Electrocatalytic Activity and CO Tolerance Properties of Mesostructured Pt/WO3 Composite as an Anode Catalyst for PEMFCs

摘要

A mesostructured Pt/WO3 electrochemical catalyst has been prepared by a loading small amount of Pt(7.5 wt %)on mesoporous tungsten oxide,which was synthesized by a simple one-step casting method using mesoporous silica(KIT-6)as a hard template.The resultant mesostructured Pt/WO3 catalyst showed high electrocatalytic activity for hydrogen electrooxidation,and the mass activity(mA·mg-Pt~(-1),per mass of Pt)of it for hydrogen electrooxidation was more than three times of that of the commercial 20 wt % Pt/C catalyst(E-TEK).In addition,it exhibited much improved resistance to CO poisoning relative to the 20 wt % Pt/C catalyst.Since the catalyst is also stable in an electrochemical environment,it could serve as an alternative electrocatalyst for proton exchange membrane fuel cells with high electrocatalytic activity and CO tolerance.