Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 121, Issue 19, Pages 10470-10475Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.7b02738
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Funding
- American Chemical Society Petroleum Research Fund [54770-DNIS]
- College of Arts and Sciences at Loyola University Chicago
- Loyola University
- Department of Chemistry and Biochemistry at the University of Tulsa
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Recent studies have shown the importance of oxide surfaces in heterogeneously catalyzed reactions. Because of the difficulties in reproducibly preparing oxidized metal surfaces, it is often unclear what species are thermodynamically stable and what factors effect the oxide formation process. In this work, we show that the thermodynamically stable phases on Rh(111) after exposure to atomic oxygen are the (2X1) O adlayer and the trilayer surface oxide, RhO2. Formation of RhO2, was facilitated by surface defects and elevated concentrations of dissolved O atoms in the subsurface region. As the concentration of subsurface O atoms decreased, the coverage of RhO2, decreased so that only the (2X1) O adlayer was present on the surface. The importance of subsurface oxygen species in RhO2 formation and stability indicates a complex relationship between surface structure and subsurface oxygen concentration.
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