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Title: Toward Phase and Catalysis Control: Tracking the Formation of Intermetallic Nanoparticles at Atomic Scale

Journal Article · · Chem

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. Lastly, 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.

Research Organization:
Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1617960
Alternate ID(s):
OSTI ID: 1515000; OSTI ID: 1547586
Report Number(s):
IS-J-9881; S245192941930083X; PII: S245192941930083X
Journal Information:
Chem, Journal Name: Chem Vol. 5 Journal Issue: 5; ISSN 2451-9294
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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Cited By (2)

Sub‐3 nm Intermetallic Ordered Pt 3 In Clusters for Oxygen Reduction Reaction journal November 2019
Dual-stimuli in-situ TEM study on the nonergodic/ergodic crossover in the 0.75(Bi 1/2 Na 1/2 )TiO 3 –0.25SrTiO 3 relaxor journal May 2019