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

被引：0

作者：

Schwaab, Valentin ^{[1
,2
]}

Duell, Fabian ^{[1
]}

Bachmann, Phiona ^{[1
]}

Hemauer, Felix ^{[1
,2
]}

Steinrueck, Hans-Peter ^{[1
]}

Papp, Christian ^{[2
]}

机构：

[1] Friedrich Alexander Univ Erlangen Nurnberg FAU, Lehrstuhl Phys Chem 2, Egerlandstr 3, D-91058 Erlangen, Germany

[2] Freie Univ Berlin FU Berlin, Angew Phys Chem, Arnimallee 22, D-14195 Berlin, Germany

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2025年 / 27卷 / 20期

关键词：

METHANOL OXIDATION; ADSORPTION; CATALYSTS; RUTHENIUM; ELECTROOXIDATION; PROMOTION; PLATINUM; RU(0001); BILAYER; GROWTH;

D O I：

10.1039/d5cp00295h

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 similar to 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.

引用

页码：10670 / 10678

页数：9

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