Support regulation for enhancing CO-tolerance performance of the PtFe HOR electrocatalyst
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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