Effect of the Ru concentration on the CO tolerance and the oxidizability of a composition spread PtRu/Pt(111) near-surface alloy

Schwaab V, Düll F, Bachmann P, Hemauer F, Steinrück HP, Papp C (2025)

Publication Type: Journal article

Publication year: 2025

Journal

DOI: 10.1039/d5cp00295h

Abstract

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 O2 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 RuOx : Ru ratio) with increasing Ru content.

Authors with CRIS profile

Involved external institutions

Freie Universität Berlin Germany (DE)

How to cite

APA:

Schwaab, V., Düll, F., Bachmann, P., Hemauer, F., Steinrück, H.-P., & Papp, C. (2025). Effect of the Ru concentration on the CO tolerance and the oxidizability of a composition spread PtRu/Pt(111) near-surface alloy. Physical Chemistry Chemical Physics. https://doi.org/10.1039/d5cp00295h

MLA:

Schwaab, Valentin, et al. "Effect of the Ru concentration on the CO tolerance and the oxidizability of a composition spread PtRu/Pt(111) near-surface alloy." Physical Chemistry Chemical Physics (2025).

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