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Turano ME, Jamka EA, Gillum MZ, Gibson KD, Farber RG, Walkosz W, Sibener SJ, Rosenberg RA, Killelea DR. Emergence of Subsurface Oxygen on Rh(111). J Phys Chem Lett 2021; 12:5844-5849. [PMID: 34138568 DOI: 10.1021/acs.jpclett.1c01820] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Oxygen atoms on transition metal surfaces are highly mobile under the demanding pressures and temperatures typically employed for heterogeneously catalyzed oxidation reactions. This mobility allows for rapid surface diffusion of oxygen atoms, as well as absorption into the subsurface and reemergence to the surface, resulting in variable reactivity. Subsurface oxygen atoms play a unique role in the chemistry of oxidized metal catalysts, yet little is known about how subsurface oxygen is formed or returns to the surface. Furthermore, if oxygen diffusion between the surface and subsurface is mediated by defects, there will be localized changes in the surface chemistry due to the elevated oxygen concentration near the emergence sites. We observed that oxygen atoms emerge preferentially along the boundary between surface phases and that subsurface oxygen is depleted before the surface oxide decomposes.
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Affiliation(s)
- Marie E Turano
- Department of Chemistry & Biochemistry, Loyola University Chicago, 1068 W. Sheridan Road, Chicago, Illinois 60660, United States
| | - Elizabeth A Jamka
- Department of Chemistry & Biochemistry, Loyola University Chicago, 1068 W. Sheridan Road, Chicago, Illinois 60660, United States
| | - Maxwell Z Gillum
- Department of Chemistry & Biochemistry, Loyola University Chicago, 1068 W. Sheridan Road, Chicago, Illinois 60660, United States
| | - K D Gibson
- Department of Chemistry and The James Franck Institute, The University of Chicago, 929 E. 57th Street, Chicago, Illinois 60637, United States
| | - Rachael G Farber
- Department of Chemistry and The James Franck Institute, The University of Chicago, 929 E. 57th Street, Chicago, Illinois 60637, United States
| | - Weronika Walkosz
- Department of Physics, Lake Forest College, 555 N. Sheridan Road, Lake Forest, Illinois 60045, United States
| | - S J Sibener
- Department of Chemistry and The James Franck Institute, The University of Chicago, 929 E. 57th Street, Chicago, Illinois 60637, United States
| | - Richard A Rosenberg
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Daniel R Killelea
- Department of Chemistry & Biochemistry, Loyola University Chicago, 1068 W. Sheridan Road, Chicago, Illinois 60660, United States
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Affiliation(s)
- Rachael G. Farber
- Department of Chemistry and Biochemistry, Loyola University Chicago, 1068 W. Sheridan Road, Chicago, Illinois 60660, United States
| | - Marie E. Turano
- Department of Chemistry and Biochemistry, Loyola University Chicago, 1068 W. Sheridan Road, Chicago, Illinois 60660, United States
| | - Daniel R. Killelea
- Department of Chemistry and Biochemistry, Loyola University Chicago, 1068 W. Sheridan Road, Chicago, Illinois 60660, United States
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Farber RG, Turano ME, Oskorep ECN, Wands NT, Juurlink LBF, Killelea DR. Exposure of Pt(5 5 3) and Rh(1 1 1) to atomic and molecular oxygen: do defects enhance subsurface oxygen formation? J Phys Condens Matter 2017; 29:164002. [PMID: 28323632 DOI: 10.1088/1361-648x/aa63a8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Subsurface oxygen is known to form in transition metals, and is thought to be an important aspect of their ability to catalyze chemical reactions. The formation of subsurface oxygen is not, however, equivalent across all catalytically relevant metals. As a result, it is difficult to predict the stability and ease of the formation of subsurface oxygen in metals, as well as how the absorbed oxygen affects the chemical and physical properties of the metal. In comparing how a stepped platinum surface, Pt(5 5 3), responds to exposure to gas-phase oxygen atoms under ultra-high vacuum conditions to planar Rh(1 1 1), we are able to determine what role, if any, steps have on the capacity of a metal for subsurface oxygen formation. Despite the presence of regular defects, we found that only surface-bound oxygen formed on Pt(5 5 3). Alternatively, on the Rh(1 1 1) surface, oxygen readily absorbed into the selvedge of the metal. These results suggest that defects alone are insufficient for the formation of subsurface oxygen, and the ability of the metal to absorb oxygen is the primary factor in the formation and stabilization of subsurface oxygen.
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Affiliation(s)
- Rachael G Farber
- Department of Chemistry & Biochemistry, Loyola University Chicago, 1068 W. Sheridan Rd., Chicago, IL 60660, Unites States of America
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Derouin J, Farber RG, Turano ME, Iski EV, Killelea DR. Thermally Selective Formation of Subsurface Oxygen in Ag(111) and Consequent Surface Structure. ACS Catal 2016. [DOI: 10.1021/acscatal.6b01239] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jonathan Derouin
- Department of Chemistry & Biochemistry, Loyola University Chicago, 1068 W. Sheridan Rd., Chicago, Illinois 60660, United States
| | - Rachael G. Farber
- Department of Chemistry & Biochemistry, Loyola University Chicago, 1068 W. Sheridan Rd., Chicago, Illinois 60660, United States
| | - Marie E. Turano
- Department of Chemistry & Biochemistry, Loyola University Chicago, 1068 W. Sheridan Rd., Chicago, Illinois 60660, United States
| | - Erin V. Iski
- Department
of Chemistry and Biochemistry, The University of Tulsa, 800 S. Tucker
Dr., Tulsa, Oklahoma 74104, United States
| | - Daniel R. Killelea
- Department of Chemistry & Biochemistry, Loyola University Chicago, 1068 W. Sheridan Rd., Chicago, Illinois 60660, United States
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