Implanting Oxophilic Sn in Pt 3 Ga Intermetallic Alloys for Efficient Alkaline Hydrogen Oxidation Reaction

ABSTRACT Exploring the alkaline hydrogen oxidation reaction (HOR) catalysts with outstanding activity and the CO tolerance ability is essential for the practical promotion of anion exchange membrane fuel cell (AEMFC). Herein, we introduce oxophilic Sn element into Pt 3 Ga intermetallic compound to obtain the Sn‐doped Pt 3 Ga (Sn‐Pt 3 Ga). Combined CO stripping results and theoretical calculations, the OH adsorption ability of Sn‐Pt 3 Ga is enhanced compared to Pt 3 Ga and Pt. As a result, the Sn‐Pt 3 Ga presents elevated intrinsic activity and mass activity of 0.690 mA cm −2 and 1.52 mA µg −1 , which are 3 times higher than those of commercial Pt. In addition, the d band center of Pt in Sn‐Pt 3 Ga shifts to the lower energy, contributing to the decreased adsorption of CO on the surface. Thus, the CO anti‐poisoning of Sn‐Pt 3 Ga is improved with only 6.02% decay of the HOR activity after the CO poisoning, while Pt shows 44.7% decay.