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Title: Probing Structural Reconstruction of Metal Nanoparticles under Annealing and Water Vapor Conditions: A Theoretical Study

Journal Article · · Journal of Physical Chemistry. C

Knowing the structural reconstruction of metal nanoparticles (NPs) under working conditions is of great importance to catalytic processes. Here, using Wulff construction combined with density functional theory (DFT) and molecular dynamics (MD) simulation, we investigated truncated octahedron-based Rh and Ir NPs (3.5, 5.5, and 9.5 nm in size) with different morphology for their structural reconstruction under annealing and water vapor conditions. Our MD results show that the NPs with lower average atomic coordination number ($$\overline{CN}$$) of surface atoms have lowered structural transformation inertness and thermal stability, resulting in more severe structural transition especially for smaller-sized NPs and Ir NPs. Under water vapor conditions, the competition between the interfacial tension ($$γ^{\overline{int}}_{hkl}$$) of (111) and (110) facets plays a major role in driving the shape evolution of Rh and Ir NPs by minimizing the total surface tension. It is revealed that annealing in vacuum/water vapor condition is an irreversible/reversible process on Rh and Ir NPs. We identified that the total adsorbate–metal ($$γ^{\overline{int}}_{hkl}$$) can serve as a key stability parameter for describing the potential energy surface of adsorbate–metal NP system in a variable gaseous environment (P, T).

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
SC0012704
OSTI ID:
1581954
Report Number(s):
BNL--213515-2020-JAAM
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 49 Vol. 123; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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