Periodic Trends in Adsorption Energies around Single-Atom Alloy Active Sites
Abstract
Single-atom alloys (SAAs) make up a special class of alloy surface catalysts that offer well-defined, isolated active sites in a more inert metal host. The dopant sites are generally assumed to have little or no influence on the properties of the host metal, and transport of chemical reactants and products to and from the dopant sites is generally assumed to be facile. Here, by performing density functional theory calculations and surface science experiments, we identify a new physical effect on SAA surfaces, whereby adsorption is destabilized by ≤300 meV on host sites within the perimeter of the reactive dopant site. We identify periodic trends for this behavior and demonstrate a zone of exclusion around the reactive sites for a range of adsorbates and combinations of host and dopant metals. Experiments confirm an increased barrier for diffusion of CO toward the dopant on a RhCu SAA. Furthermore, this effect offers new possibilities for understanding and designing active sites with tunable energetic landscapes surrounding them.
- Authors:
-
- Univ. College London (United Kingdom); Univ. of Cambridge (United Kingdom)
- Univ. College London (United Kingdom)
- Tufts Univ., Medford, MA (United States)
- Publication Date:
- Research Org.:
- Tufts Univ., Medford, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1844969
- Grant/Contract Number:
- SC0004738
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry Letters
- Additional Journal Information:
- Journal Volume: 12; Journal Issue: 41; Journal ID: ISSN 1948-7185
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Impurities; Energy; Metals; Adsorption; Diffusion
Citation Formats
Schumann, Julia, Bao, Yutian, Hannagan, Ryan T., Sykes, E. Charles H., Stamatakis, Michail, and Michaelides, Angelos. Periodic Trends in Adsorption Energies around Single-Atom Alloy Active Sites. United States: N. p., 2021.
Web. doi:10.1021/acs.jpclett.1c02497.
Schumann, Julia, Bao, Yutian, Hannagan, Ryan T., Sykes, E. Charles H., Stamatakis, Michail, & Michaelides, Angelos. Periodic Trends in Adsorption Energies around Single-Atom Alloy Active Sites. United States. https://doi.org/10.1021/acs.jpclett.1c02497
Schumann, Julia, Bao, Yutian, Hannagan, Ryan T., Sykes, E. Charles H., Stamatakis, Michail, and Michaelides, Angelos. Mon .
"Periodic Trends in Adsorption Energies around Single-Atom Alloy Active Sites". United States. https://doi.org/10.1021/acs.jpclett.1c02497. https://www.osti.gov/servlets/purl/1844969.
@article{osti_1844969,
title = {Periodic Trends in Adsorption Energies around Single-Atom Alloy Active Sites},
author = {Schumann, Julia and Bao, Yutian and Hannagan, Ryan T. and Sykes, E. Charles H. and Stamatakis, Michail and Michaelides, Angelos},
abstractNote = {Single-atom alloys (SAAs) make up a special class of alloy surface catalysts that offer well-defined, isolated active sites in a more inert metal host. The dopant sites are generally assumed to have little or no influence on the properties of the host metal, and transport of chemical reactants and products to and from the dopant sites is generally assumed to be facile. Here, by performing density functional theory calculations and surface science experiments, we identify a new physical effect on SAA surfaces, whereby adsorption is destabilized by ≤300 meV on host sites within the perimeter of the reactive dopant site. We identify periodic trends for this behavior and demonstrate a zone of exclusion around the reactive sites for a range of adsorbates and combinations of host and dopant metals. Experiments confirm an increased barrier for diffusion of CO toward the dopant on a RhCu SAA. Furthermore, this effect offers new possibilities for understanding and designing active sites with tunable energetic landscapes surrounding them.},
doi = {10.1021/acs.jpclett.1c02497},
journal = {Journal of Physical Chemistry Letters},
number = 41,
volume = 12,
place = {United States},
year = {Mon Oct 11 00:00:00 EDT 2021},
month = {Mon Oct 11 00:00:00 EDT 2021}
}
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