SECM characterization of Pt–Ru–WC and Pt–Ru–Co ternary thin film combinatorial libraries as anode electrocatalysts for PEMFC

Rapid screening of electrocatalytic activity of ternary Pt–Ru–WC and Pt–Ru–Co thin film gradient material libraries towards hydrogen oxidation in the presence or absence of CO adsorption was performed by scanning electrochemical microscopy. It was observed that the addition of WC or Co to Pt or Pt-Ru catalysts can improve their hydrogen oxidation reaction activity and CO tolerance, making them suitable as potential electrocatalysts for polymer electrolyte membrane fuel cells. The stability of WC and Co in the acidic electrolyte were enhanced by alloying with Pt. SECM offers the capability for both qualitative and quantitative characterization of electrocatalytic activity of thin films of potential fuel cell electrode material candidates. However, promising electrode compositions identified by this technique need to be verified by traditional electrode preparation and characterization techniques.