skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Characterization of Oxygenaceous Species Formed by Exposure of Ag(111) to Atomic Oxygen

Abstract

The uptake and chemical speciation of oxygen in and on Ag(111) surface is described herein. An Ag(111) surface was exposed to gas-phase oxygen atoms under ultrahigh vacuum compatible conditions at various surface temperatures. The O uptake was quantified using temperature-programmed desorption measurements and showed that oxygen exposures at temperatures above 500 K yielded only surface-adsorbed oxygen in a single surface reconstruction. At temperatures below 500 K, O uptake continued past O surface saturation, and a maximum in the uptake with respect to exposure temperature was observed at 450 K. A model where O atoms must diffuse out of subsurface absorption sites to free room for further O describes this observation. The chemical speciation of the oxygenaceous species formed under these conditions was achieved using X-ray photoelectron spectroscopy. These data show that a single O species initially formed on the surface, but at higher coverages, a new, three-dimensional oxygenaceous phase developed. Because of the importance of silver in heterogeneously catalyzed partial oxidation reactions, these results show that oxygen species embedded below the surface plane must be incorporated into accurate models of Ag-surface catalyzed reactions.

Authors:
 [1];  [1];  [1];  [2]; ORCiD logo [1]
  1. Loyola Univ. Chicago, IL (United States)
  2. Loyola Univ. Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
National Science Foundation (NSF); Loyola UniversityjChicago; Donors of the American Chemical Society Petroleum Research Fund; USDOE Office of Science (SC), Basic Energy Sciences (BES); Arthur J. Schmitt Foundation
OSTI Identifier:
1604983
Grant/Contract Number:  
AC02-06CH11357; PRF #54770-DNI5
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 124; Journal Issue: 2; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Surface analysis; Desorption; Diffusion; Oxygen; X-ray photoelectron spectroscopy

Citation Formats

Turano, Marie E., Farber, Rachael G., Oskorep, Eleanor C. N., Rosenberg, Richard A., and Killelea, Daniel R.. Characterization of Oxygenaceous Species Formed by Exposure of Ag(111) to Atomic Oxygen. United States: N. p., 2019. Web. https://doi.org/10.1021/acs.jpcc.9b09131.
Turano, Marie E., Farber, Rachael G., Oskorep, Eleanor C. N., Rosenberg, Richard A., & Killelea, Daniel R.. Characterization of Oxygenaceous Species Formed by Exposure of Ag(111) to Atomic Oxygen. United States. https://doi.org/10.1021/acs.jpcc.9b09131
Turano, Marie E., Farber, Rachael G., Oskorep, Eleanor C. N., Rosenberg, Richard A., and Killelea, Daniel R.. Tue . "Characterization of Oxygenaceous Species Formed by Exposure of Ag(111) to Atomic Oxygen". United States. https://doi.org/10.1021/acs.jpcc.9b09131. https://www.osti.gov/servlets/purl/1604983.
@article{osti_1604983,
title = {Characterization of Oxygenaceous Species Formed by Exposure of Ag(111) to Atomic Oxygen},
author = {Turano, Marie E. and Farber, Rachael G. and Oskorep, Eleanor C. N. and Rosenberg, Richard A. and Killelea, Daniel R.},
abstractNote = {The uptake and chemical speciation of oxygen in and on Ag(111) surface is described herein. An Ag(111) surface was exposed to gas-phase oxygen atoms under ultrahigh vacuum compatible conditions at various surface temperatures. The O uptake was quantified using temperature-programmed desorption measurements and showed that oxygen exposures at temperatures above 500 K yielded only surface-adsorbed oxygen in a single surface reconstruction. At temperatures below 500 K, O uptake continued past O surface saturation, and a maximum in the uptake with respect to exposure temperature was observed at 450 K. A model where O atoms must diffuse out of subsurface absorption sites to free room for further O describes this observation. The chemical speciation of the oxygenaceous species formed under these conditions was achieved using X-ray photoelectron spectroscopy. These data show that a single O species initially formed on the surface, but at higher coverages, a new, three-dimensional oxygenaceous phase developed. Because of the importance of silver in heterogeneously catalyzed partial oxidation reactions, these results show that oxygen species embedded below the surface plane must be incorporated into accurate models of Ag-surface catalyzed reactions.},
doi = {10.1021/acs.jpcc.9b09131},
journal = {Journal of Physical Chemistry. C},
number = 2,
volume = 124,
place = {United States},
year = {2019},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Save / Share: