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

IF 2.9 3区化学 Q3 CHEMISTRY, PHYSICAL

Physical Chemistry Chemical Physics Pub Date : 2025-04-15 DOI:10.1039/d5cp00295h

Valentin Schwaab, Fabian Düll, Philipp Bachmann, Felix Hemauer, Hans-Peter Steinrück, Christian Papp

引用次数: 0

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.

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Ru浓度对PtRu/Pt（111）近表面合金CO耐受性和氧化性的影响

我们制备了一种具有Pt（111）横向浓度梯度的Pt端部PtRu近表面合金。将近表面合金暴露于100 K的CO或600 K的O2中，随后使用基于同步加速器的高分辨率x射线光电子能谱进行研究。通过在聚焦的x射线束（光斑尺寸~0.05 mm）下横向移动样品，我们能够在相同的测量条件下研究局部不同的合金成分。随着地下Ru浓度的增加，我们观察到铂桥位置的CO占用逐渐减少，而顶部吸附CO的量在所研究的成分范围内保持不变。合金的氧化表明，随着Ru含量的增加，氧化Ru原子的分数（RuOx:Ru比）明显增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physical Chemistry Chemical Physics 化学-物理：原子、分子和化学物理

CiteScore

5.50

自引率

9.10%

发文量

2675

审稿时长

2.0 months

期刊介绍： Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.