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Title: Toward rational nanoparticle synthesis: predicting surface intermixing in bimetallic alloy nanocatalysts

Abstract

In this paper, we present a database of first-principles calculated activation energy barriers for two competitive processes involving bimetallic adatom-surface permutations of ten transition metals: (i) adatom “hopping” diffusion and (ii) adatom substitution into the surface. We consider the surface structure sensitivity of these events as well as coverage effects. We find that surface hopping mechanisms are facile and always preferred to substitution events on close-packed fcc(111) and hcp(0001) surfaces. However, surface atom substitution is more facile on the more open fcc(100) surfaces and is competitive with adatom surface hopping, which is more difficult than on the close-packed surfaces. Finally, by comparing the absolute and relative magnitudes of the energetics of hopping and substitution, our calculations can offer qualitative predictions of intermixing and other phenomena relevant to nanocrystal growth, such as the tendency to form intermixed alloys or core–shell structures during layer-by-layer nanoparticle synthesis involving a given bimetallic pair, and thereby inform the rational design and synthesis of novel bimetallic nanomaterials.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of Wisconsin, Madison, WI (United States)
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Contributing Org.:
Environmental Molecular Sciences Laboratory (EMSL); the Center for Nanoscale Materials (CNM) at Argonne National Laboratory; and the National Energy Research Scientific Computing Center (NERSC).
OSTI Identifier:
1395996
Grant/Contract Number:  
FG02-05ER15731
Resource Type:
Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Volume: 9; Journal Issue: 39; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY

Citation Formats

Roling, Luke T., and Mavrikakis, Manos. Toward rational nanoparticle synthesis: predicting surface intermixing in bimetallic alloy nanocatalysts. United States: N. p., 2017. Web. doi:10.1039/C7NR04779G.
Roling, Luke T., & Mavrikakis, Manos. Toward rational nanoparticle synthesis: predicting surface intermixing in bimetallic alloy nanocatalysts. United States. doi:10.1039/C7NR04779G.
Roling, Luke T., and Mavrikakis, Manos. Tue . "Toward rational nanoparticle synthesis: predicting surface intermixing in bimetallic alloy nanocatalysts". United States. doi:10.1039/C7NR04779G. https://www.osti.gov/servlets/purl/1395996.
@article{osti_1395996,
title = {Toward rational nanoparticle synthesis: predicting surface intermixing in bimetallic alloy nanocatalysts},
author = {Roling, Luke T. and Mavrikakis, Manos},
abstractNote = {In this paper, we present a database of first-principles calculated activation energy barriers for two competitive processes involving bimetallic adatom-surface permutations of ten transition metals: (i) adatom “hopping” diffusion and (ii) adatom substitution into the surface. We consider the surface structure sensitivity of these events as well as coverage effects. We find that surface hopping mechanisms are facile and always preferred to substitution events on close-packed fcc(111) and hcp(0001) surfaces. However, surface atom substitution is more facile on the more open fcc(100) surfaces and is competitive with adatom surface hopping, which is more difficult than on the close-packed surfaces. Finally, by comparing the absolute and relative magnitudes of the energetics of hopping and substitution, our calculations can offer qualitative predictions of intermixing and other phenomena relevant to nanocrystal growth, such as the tendency to form intermixed alloys or core–shell structures during layer-by-layer nanoparticle synthesis involving a given bimetallic pair, and thereby inform the rational design and synthesis of novel bimetallic nanomaterials.},
doi = {10.1039/C7NR04779G},
journal = {Nanoscale},
number = 39,
volume = 9,
place = {United States},
year = {2017},
month = {9}
}

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