Effect of the Ru concentration on the CO tolerance and the oxidizability of a composition spread PtRu/Pt(111) near-surface alloy
We prepared a Pt-terminated PtRu near-surface alloy with a lateral concentration gradient on Pt(111). The near-surface alloy is exposed to CO at 100 K or O<sub>2</sub> at 600 K and subsequently investigated using synchrotron-based high-resolution X-ray photoelectron spectroscopy. By moving the sample laterally under the focused X-ray beam (spot size ∼0.05 mm), we were able to study locally different alloy compositions under identical measurement conditions. With increasing subsurface Ru concentration, we observe a gradual decrease in the CO occupancy of Pt bridge sites, while the amount of on-top adsorbed CO remains constant over the investigated compositional range. Oxidation of the alloy reveals a clear increase in the fraction of oxidized Ru atoms (the RuO<sub><i>x</i></sub> : Ru ratio) with increasing Ru content.
Authors
- Philipp Bachmann (ORCID: https://orcid.org/0000-0001-5478-4697)
- Fabian Düll (ORCID: https://orcid.org/0000-0002-1861-7186)
- Hans‐Peter Steinrück (ORCID: https://orcid.org/0000-0003-1347-8962)
- Felix Hemauer (ORCID: https://orcid.org/0000-0003-1226-0056)
- Valentin Schwaab (ORCID: https://orcid.org/0000-0002-5441-8846)
- Christian Papp (ORCID: https://orcid.org/0000-0002-1733-4387)
Institutions
- Friedrich-Alexander-Universität Erlangen-Nürnberg (DE)
- Freie Universität Berlin (DE)
Publication Details
- Journal
- Physical Chemistry Chemical Physics
- Published
- 2025-01-01
- DOI
- https://doi.org/10.1039/d5cp00295h
- Primary Topic
- Catalytic Processes in Materials Science
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Deutsche Forschungsgemeinschaft
- Bayerische Staatsministerium für Wirtschaft, Landesentwicklung und Energie
- Helmholtz-Zentrum Berlin für Materialien und Energie