biostudies-literatureUnknown16(1)Shen DReducing Pt loading in the anodic hydrogen oxidation reaction (HOR) and concurrently increasing mass activity and CO tolerance are essential for advancing proton exchange membrane fuel cells (PEMFCs). Here, an electrocatalyst of 1.7 wt% Pt clusters loaded on a hollow bowl-like W₃O/WC heterostructure is designed to increase the anti-CO-poisoning HOR. Due to its unique electron delocalization effect, the W₃O/WC heterostructure serves as a warehouse to share electrons with Pt; this simultaneously lowers the HOR barrier and accumulates the hydroxyl radicals (•OH) to accelerate CO oxidation. The Pt‒O bond originating from the oxygen spillover effect of W₃O promotes hydrogen and CO oxidation, whereas the lattice‒O consumed in W₃O replenished through waNature communications3883https://www.ebi.ac.uk/biostudies/studies/S-EPMC12022038biostudies-literatureOxygen spillover on supported Pt-cluster for anti-CO-poisoning hydrogen oxidation.PMC12022038Xie YFu HLiang ZShen DSun FWang YMei BWang LfalseOxygen spillover on supported Pt-cluster for anti-CO-poisoning hydrogen oxidation.Reducing Pt loading in the anodic hydrogen oxidation reaction (HOR) and concurrently increasing mass activity and CO tolerance are essential for advancing proton exchange membrane fuel cells (PEMFCs). Here, an electrocatalyst of 1.7 wt% Pt clusters loaded on a hollow bowl-like W₃O/WC heterostructure is designed to increase the anti-CO-poisoning HOR. Due to its unique electron delocalization effect, the W₃O/WC heterostructure serves as a warehouse to share electrons with Pt; this simultaneously lowers the HOR barrier and accumulates the hydroxyl radicals (•OH) to accelerate CO oxidation. The Pt‒O bond originating from the oxygen spillover effect of W₃O promotes hydrogen and CO oxidation, whereas the lattice‒O consumed in W₃O replenished through wa2025-01-01T00:00:00Z2025 Apr2026-06-04T05:04:01.738Z2025-06-26T03:06:07.794ZS-EPMC120220384027476710.1038/s41467-025-58735-0