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Title: Oxygen and sulfur adsorption on vicinal surfaces of copper and silver: Preferred adsorption sites

Abstract

We present an extensive density functional theory (DFT) study of adsorption site energetics for oxygen and sulfur adsorbed on two vicinal surfaces of Cu and Ag, with the goal of identifying the most stable adsorption site(s), identifying trends and common themes, and comparing with experimental work in the literature where possible. We also present benchmark calculations for adsorption on the flat (111) and (100) surfaces. The first vicinal surface is the (211), and results are similar for both metals. Here, we find that the step-doubling reconstruction is favored with both adsorbates and is driven by the creation of a special stable fourfold hollow (4fh) site at the reconstructed step. Zig-zag chain structures consisting of X–M–X units (X = chalcogen, M = metal) at the step edge are considered, in which the special 4fh site is partially occupied. The zig-zag configuration is energetically competitive for oxygen but not sulfur. DFT results for oxygen agree with experiment in terms of the stability of the reconstruction, but contradict the original site assignment. The second vicinal surface is the (410), where again results are similar for both metals. For oxygen, DFT predicts that step sites are filled preferentially even at lowest coverage, followed bymore » terrace sites, consistent with the experiment. For sulfur, in contrast, DFT predicts that terrace sites fill first. Oxygen forms O–M–O rows on the top edge of the step, where it occupies incomplete 4fh sites. This resolves an experimental ambiguity in the site assignment. Finally, for both the (211) and (410) surfaces, the interaction energy that stabilizes the X–M–X chain or row correlates with the linearity of the X–M–X unit, which may explain key differences between oxygen and sulfur.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Ames Lab., Ames, IA (United States)
  2. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Chemistry, and Dept. of Materials Science and Engineering
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1433658
Alternate Identifier(s):
OSTI ID: 1430154
Report Number(s):
IS-J-9605
Journal ID: ISSN 0021-9606; TRN: US1802431
Grant/Contract Number:  
CHE-1507223; AC02-05CH11231; AC02-07CH11358
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 148; Journal Issue: 12; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Liu, Da-Jiang, and Thiel, Patricia A. Oxygen and sulfur adsorption on vicinal surfaces of copper and silver: Preferred adsorption sites. United States: N. p., 2018. Web. doi:10.1063/1.5021091.
Liu, Da-Jiang, & Thiel, Patricia A. Oxygen and sulfur adsorption on vicinal surfaces of copper and silver: Preferred adsorption sites. United States. doi:10.1063/1.5021091.
Liu, Da-Jiang, and Thiel, Patricia A. Wed . "Oxygen and sulfur adsorption on vicinal surfaces of copper and silver: Preferred adsorption sites". United States. doi:10.1063/1.5021091. https://www.osti.gov/servlets/purl/1433658.
@article{osti_1433658,
title = {Oxygen and sulfur adsorption on vicinal surfaces of copper and silver: Preferred adsorption sites},
author = {Liu, Da-Jiang and Thiel, Patricia A.},
abstractNote = {We present an extensive density functional theory (DFT) study of adsorption site energetics for oxygen and sulfur adsorbed on two vicinal surfaces of Cu and Ag, with the goal of identifying the most stable adsorption site(s), identifying trends and common themes, and comparing with experimental work in the literature where possible. We also present benchmark calculations for adsorption on the flat (111) and (100) surfaces. The first vicinal surface is the (211), and results are similar for both metals. Here, we find that the step-doubling reconstruction is favored with both adsorbates and is driven by the creation of a special stable fourfold hollow (4fh) site at the reconstructed step. Zig-zag chain structures consisting of X–M–X units (X = chalcogen, M = metal) at the step edge are considered, in which the special 4fh site is partially occupied. The zig-zag configuration is energetically competitive for oxygen but not sulfur. DFT results for oxygen agree with experiment in terms of the stability of the reconstruction, but contradict the original site assignment. The second vicinal surface is the (410), where again results are similar for both metals. For oxygen, DFT predicts that step sites are filled preferentially even at lowest coverage, followed by terrace sites, consistent with the experiment. For sulfur, in contrast, DFT predicts that terrace sites fill first. Oxygen forms O–M–O rows on the top edge of the step, where it occupies incomplete 4fh sites. This resolves an experimental ambiguity in the site assignment. Finally, for both the (211) and (410) surfaces, the interaction energy that stabilizes the X–M–X chain or row correlates with the linearity of the X–M–X unit, which may explain key differences between oxygen and sulfur.},
doi = {10.1063/1.5021091},
journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 12,
volume = 148,
place = {United States},
year = {2018},
month = {3}
}

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