Enhanced CO Poisoning Resistance for HOR of PEMFC by Ni-Doped Pt-Based Catalysts

Abstract

Fuel cells are efficient power generation devices that directly convert chemical energy into electrical energy through chemical reactions. Fuel cell vehicles powered by proton exchange membrane fuel cells have many advantages, such as low operating temperature, quick start-up, high energy density, high power density, and fast response to load changes. However, the performance of the catalyst in the anode reaction deteriorates sharply due to the extreme sensitivity of Pt atoms to CO in the anode reaction. CO easily occupies the reactive sites of Pt atoms, leading to a significant decrease in the catalytic performance of the anode reaction. Therefore, in this study, the impregnation reduction method is used to introduce transition metal Ni elements to modify Pt/C catalysts to enhance the CO tolerance of Pt-based catalysts. In a H₂ + 100 ppm CO atmosphere, the mass-specific activity (MA) reaches 1.307 A/mg, which is 3.48 times that of commercial Pt/C catalysts The influence of different Ni element ratios on the resistance of Pt-based catalysts to CO poisoning is analyzed, providing a new approach for developing anode catalysts with high CO tolerance.