Journal
SCIENCE
Volume 344, Issue 6183, Pages 495-499Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1252553
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Funding
- Ministry of Science and Technology of China [2011CB932403]
- National Nature Science Foundation of China [21131005, 20925103, 21373167, 21033006, 21333008]
- Natural Sciences and Engineering Research Council of Canada
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Hybrid metal nanoparticles can allow separate reaction steps to occur in close proximity at different metal sites and accelerate catalysis. We synthesized iron-nickel hydroxide-platinum (transition metal-OH-Pt) nanoparticles with diameters below 5 nanometers and showed that they are highly efficient for carbon monoxide (CO) oxidation catalysis at room temperature. We characterized the composition and structure of the transition metal-OH-Pt interface and showed that Ni2+ plays a key role in stabilizing the interface against dehydration. Density functional theory and isotope-labeling experiments revealed that the OH groups at the Fe3+-OH-Pt interfaces readily react with CO adsorbed nearby to directly yield carbon dioxide (CO2) and simultaneously produce coordinatively unsaturated Fe sites for O-2 activation. The oxide-supported PtFeNi nanocatalyst rapidly and fully removed CO from humid air without decay in activity for 1 month.
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