Oxygen spillover on supported Pt-cluster for anti-CO-poisoning hydrogen oxidation.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40274767.
- Also identified by DOI 10.1038/s41467-025-58735-0 and PMC identifier 12022038.
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Abstract
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 W<sub>3</sub>O/WC heterostructure is designed to increase the anti-CO-poisoning HOR. Due to its unique electron delocalization effect, the W<sub>3</sub>O/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 W<sub>3</sub>O promotes hydrogen and CO oxidation, whereas the lattice‒O consumed in W<sub>3</sub>O replenished through water dissociation. The resultant electrocatalyst exhibits mass activity of 469 A g<sup>‒1</sup> at 50 mV and anti-toxicity even at 2000 ppm CO. The PEMEC delivers a peak power density of 1.63 W cm<sup>‒2</sup> and maintains considerable anti-CO poisoning performance.