Bibliographic Details
| Title: |
Enhanced oxidation on stepped Rh surfaces. |
| Authors: |
Gonzalez, Alexis L.1 (AUTHOR), Serna-Sanchez, Elizabeth1 (AUTHOR), Gillum, Maxwell Z.1 (AUTHOR), Diedrich, Johannes V.2,3 (AUTHOR), Danahey, Stephanie1 (AUTHOR), Schäfer, Tim2,3 (AUTHOR), Killelea, Daniel R.1 (AUTHOR) dkillelea@luc.edu |
| Source: |
Journal of Vacuum Science & Technology: Part A-Vacuums, Surfaces & Films. Jul2026, Vol. 44 Issue 4, p1-8. 8p. |
| Subjects: |
Oxidation, Surface structure, Physisorption, Surface chemistry, Rhodium catalysts, Low energy electron diffraction, Desorption, Catalysis |
| Abstract: |
Understanding how surface structure influences oxidation processes is essential for advancing the design of metal-based catalysts. In this study, we investigated how oxygen adsorbed on a bifaceted Rh(111)/(322) single crystal using low-energy electron diffraction (LEED) and temperature programmed desorption (TPD). The (111) facet represented a flat, close-packed surface, while the (322) facet introduced a high density of well-defined, repeating stepped features with more undercoordinated atoms. Our results revealed pronounced structure sensitivity. Low temperature atomic oxygen exposures lead to enhanced O coverages on both facets; however, LEED revealed an ordered overlayer on Rh(111) and a faintless crystalline adlayer on Rh(322). Oxygen exposures at 600 K caused oxide formation on the (111) facet but not on the (322) facet, and oxide was not observed on either facet for lower temperature O2 exposures. Notably, the additional O uptake was observed. While TPD measurements show similar adsorption energies for the various oxygen species, LEED analysis reveals clear structural differences on the stepped surface. These findings highlight the critical role of facet-specific coordination environments in dictating oxidation behavior and having insight into oxygen mobility across catalytic surfaces. [ABSTRACT FROM AUTHOR] |
|
Copyright of Journal of Vacuum Science & Technology: Part A-Vacuums, Surfaces & Films is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| Database: |
Engineering Source |
