期刊
NATURE COMMUNICATIONS
卷 10, 期 -, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41467-019-11856-9
关键词
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资金
- National Key RD Program [2017YFC0211303]
- Natural Science Foundation of China [21576207]
- GM Global RD
- University of Michigan - GM Global RD
- US Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office, Propulsion Materials Program
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
Despite the maximized metal dispersion offered by single-atom catalysts, further improvement of intrinsic activity can be hindered by the lack of neighboring metal atoms in these systems. Here we report the use of isolated Pt-1 atoms on ceria as seeds to develop a Pt-O-Pt ensemble, which is well-represented by a Pt8O14 model cluster that retains 100% metal dispersion. The Pt atom in the ensemble is 100-1000 times more active than their single-atom Pt-1/CeO2 parent in catalyzing the low-temperature CO oxidation under oxygen-rich conditions. Rather than the Pt-O-Ce interfacial catalysis, the stable catalytic unit is the Pt-O-Pt site itself without participation of oxygen from the 10-30 nm-size ceria support. Similar Pt-O-Pt sites can be built on various ceria and even alumina, distinguishable by facile activation of oxygen through the paired Pt-O-Pt atoms. Extending this design to other reaction systems is a likely outcome of the findings reported here.
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