Hydrogen energy technology,which is represented by proton exchange membrane fuel cell(PEMFC),is an important cornerstone of our energy strategy,playing crucial role in realizing the double carbon goal and alleviating the energy-related and environmental problems.The purified hydrogen with high cost is currently used in the anode side of PEMFC,promoting the application of low-cost gray hydrogen with CO residue is beneficial for accelerating the commercialization process of PEMFC technology.Pt/C is widely utilized as the anodic HOR electroacatalyst,but it can be deactivated even when the CO concentration is less than 10 ppm(1 ppm=10-6),rendering the development of CO-tolerant Pt-based catalysts to be pivotal issue.Alleviating the CO adsorption at the triple-phase interferface by alloying strategy can improve the CO tolerance of Pt-based electrocatalysts,but the effect of supports on the CO tolerance is rarely reported.The effects of carbon and oxide support on the morphology,metal valence and CO-resistance of PtFe alloy were investigated by co-impregnation method,aiming for investigating the relationship between the metal-support interaction and the CO tolerance of designed electrocatalysts.The carbon support can improve the homogeneity of PtFe alloy particles,improve the surface valence of Pt,thus PtFe/C can exhibit excellent anti-CO poisoning performance.The PtFe/C electrocatalyst only showed 5.2％HOR activity decline at 1 000 ppm H2/CO,while the HOR activity of the commercial Pt/C decreased by 66.1％.The HOR activity retention rate of PtFe/C electrocatalyst was 98％after 2 000 s in 1000 ppm H2/CO,while the commercial Pt/C catalyst had no HOR activity after 2000 s.Pt in the PtFe/C electrocatalyst has higher valence state,which means a lower d-band center and weakened CO adsorption on the HOR-active Pt sites,thus the PtFe/C electrocatalyst reveals excellent CO tolerance.
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