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Enhanced oxidation on stepped Rh surfaces.

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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
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  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 195070441
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Enhanced oxidation on stepped Rh surfaces.
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  Data: <searchLink fieldCode="AR" term="%22Gonzalez%2C+Alexis+L%2E%22">Gonzalez, Alexis L.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Serna-Sanchez%2C+Elizabeth%22">Serna-Sanchez, Elizabeth</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gillum%2C+Maxwell+Z%2E%22">Gillum, Maxwell Z.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Diedrich%2C+Johannes+V%2E%22">Diedrich, Johannes V.</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Danahey%2C+Stephanie%22">Danahey, Stephanie</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Schäfer%2C+Tim%22">Schäfer, Tim</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Killelea%2C+Daniel+R%2E%22">Killelea, Daniel R.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> dkillelea@luc.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Vacuum+Science+%26+Technology%3A+Part+A-Vacuums%2C+Surfaces+%26+Films%22">Journal of Vacuum Science & Technology: Part A-Vacuums, Surfaces & Films</searchLink>. Jul2026, Vol. 44 Issue 4, p1-8. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Oxidation%22">Oxidation</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+structure%22">Surface structure</searchLink><br /><searchLink fieldCode="DE" term="%22Physisorption%22">Physisorption</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+chemistry%22">Surface chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Rhodium+catalysts%22">Rhodium catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Low+energy+electron+diffraction%22">Low energy electron diffraction</searchLink><br /><searchLink fieldCode="DE" term="%22Desorption%22">Desorption</searchLink><br /><searchLink fieldCode="DE" term="%22Catalysis%22">Catalysis</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>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.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1116/6.0005459
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 8
        StartPage: 1
    Subjects:
      – SubjectFull: Oxidation
        Type: general
      – SubjectFull: Surface structure
        Type: general
      – SubjectFull: Physisorption
        Type: general
      – SubjectFull: Surface chemistry
        Type: general
      – SubjectFull: Rhodium catalysts
        Type: general
      – SubjectFull: Low energy electron diffraction
        Type: general
      – SubjectFull: Desorption
        Type: general
      – SubjectFull: Catalysis
        Type: general
    Titles:
      – TitleFull: Enhanced oxidation on stepped Rh surfaces.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Gonzalez, Alexis L.
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            NameFull: Serna-Sanchez, Elizabeth
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            NameFull: Gillum, Maxwell Z.
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            NameFull: Diedrich, Johannes V.
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            NameFull: Danahey, Stephanie
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            NameFull: Schäfer, Tim
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          Dates:
            – D: 01
              M: 07
              Text: Jul2026
              Type: published
              Y: 2026
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              Value: 07342101
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              Value: 44
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              Value: 4
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            – TitleFull: Journal of Vacuum Science & Technology: Part A-Vacuums, Surfaces & Films
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