期刊
CHEM
卷 5, 期 5, 页码 1235-1247出版社
CELL PRESS
DOI: 10.1016/j.chempr.2019.02.026
关键词
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资金
- Laboratory Directed Research and Development funds through the Ames Laboratory
- US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
- US Department of Energy [DE-AC02-07CH11358]
- National Science Foundation [1808239, CMMI-1406462]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1808239] Funding Source: National Science Foundation
Intermetallic nanoparticles (iNPs) have yielded enormous successes in catalytic applications by the formation of ordered phases. However, atomic-level understanding of the alloying mechanism, which plays a pivotal role in controlling intermetallic phases and tailoring their catalytic properties, is still elusive. In this study, we discovered a consecutive formation of ordered Pt3Sn and PtSn phases during the growth of Pt-Sn iNP inside a well-defined nano-reactor at elevated temperature by using in situ scanning transmission electron microscopy. We found that the surface-mediated diffusion of Sn controls overall dynamics of the reaction, while the unique coherent interfacial structure is determinative for the PtSn transformation. We then further controlled the phase selection of Pt-Sn iNPs and demonstrated their distinguishable catalytic behaviors. Our findings not only provide detailed experimental evidence on the alloying mechanism in intermetallic nanoscale systems but also pave the way for mechanistic control of synthesis and catalytic properties of iNPs.
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