期刊
SCIENCE
卷 344, 期 6183, 页码 495-499出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1252553
关键词
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资金
- 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
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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