biostudies-literatureUnknown13(1)Jia ZHydrogen is increasingly being discussed as clean energy for the goal of net-zero carbon emissions, applied in the proton-exchange-membrane fuel cells (PEMFC). The preferential oxidation of CO (PROX) in hydrogen is a promising solution for hydrogen purification to avoid catalysts from being poisoned by the trace amount of CO in hydrogen-rich fuel gas. Here, we report the fabrication of a novel bimetallic Pt-Fe catalyst with ultralow metal loading, in which fully-exposed Pt clusters bonded with neighbor atomically dispersed Fe atoms on the defective graphene surface. The fully-exposed PtFe cluster catalyst could achieve complete elimination of CO through PROX reaction and almost 100% CO selectivity, while maintaining good stability for a long period. It has the mass-specific activity of 6.1Nature communications6798https://www.ebi.ac.uk/biostudies/studies/S-EPMC9649773biostudies-literatureFully-exposed Pt-Fe cluster for efficient preferential oxidation of CO towards hydrogen purification.PMC9649773Liu HHuang FWen XQin XZhou WWang NJiang ZGao ZChen YXiao DMa DPeng MCai XJia ZfalseFully-exposed Pt-Fe cluster for efficient preferential oxidation of CO towards hydrogen purification.Hydrogen is increasingly being discussed as clean energy for the goal of net-zero carbon emissions, applied in the proton-exchange-membrane fuel cells (PEMFC). The preferential oxidation of CO (PROX) in hydrogen is a promising solution for hydrogen purification to avoid catalysts from being poisoned by the trace amount of CO in hydrogen-rich fuel gas. Here, we report the fabrication of a novel bimetallic Pt-Fe catalyst with ultralow metal loading, in which fully-exposed Pt clusters bonded with neighbor atomically dispersed Fe atoms on the defective graphene surface. The fully-exposed PtFe cluster catalyst could achieve complete elimination of CO through PROX reaction and almost 100% CO selectivity, while maintaining good stability for a long period. It has the mass-specific activity of 6.12022-01-01T00:00:00Z2022 Nov2025-04-25T23:31:32.533Z2025-04-06T09:25:56.969ZS-EPMC96497733635742110.1038/s41467-022-34674-y