FeP Modulated Adsorption with Hydrogen and Phosphate Species for Hydrogen Oxidation in High-Temperature Polymer Electrolyte Membrane Fuel Cells

High-temperature polymer electrolyte membrane fuel cells (HT-PEMFCs) play an important role in the future hydrogen application system. However, there are still many issues of HT-PEMFCs, especially on performance and durability, to be solved. Massive platinum usage is one of the most intractable issues. Herein, iron phosphide to platinum-based catalyst is introduced for the better activity of hydrogen oxidation reaction (HOR). This catalyst shows a similar HOR performance with commercial catalyst while only one-eighth noble metal is used in the anode of HT-PEMFCs. The HT-PEMFCs with Pt/FeP/C anode reach 465 mW cm⁻² with a loading mass of 0.125 mg_Pt cm⁻², and maintain long-term stability. The excellent HOR activity and better fuel cell performance are attributed to the weakened absorption of hydrogen intermediate and concentrated phosphate species by that iron phosphide, leading to enhanced HOR activity and better fuel cell performance. This study provides new strategies for designing advanced HOR catalysts for HT-PEMFCs.