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

共 44 条

[1] On the origin of Ru bilayer island growth on Pt(111) [J].

Bergbreiter, A. ;

Berko, A. ;

Erne, P. M. ;

Hoster, H. E. ;

Behm, R. J. .

VACUUM, 2009, 84 (01) :13-18

[2] From bilayer to monolayer growth: Temperature effects in the growth of Ru on Pt(111) [J].

Berko, A. ;

Bergbreiter, A. ;

Hoster, H. E. ;

Behm, R. J. .

SURFACE SCIENCE, 2009, 603 (16) :2556-2563

[3] Structural determination of molecules adsorbed in different sites by means of chemical shift photoelectron diffraction: c(4 x 2)-CO on Pt(111) [J].

Bondino, F ;

Comelli, G ;

Esch, F ;

Locatelli, A ;

Baraldi, A ;

Lizzit, S ;

Paolucci, G ;

Rosei, R .

SURFACE SCIENCE, 2000, 459 (1-2) :L467-L474

[4] The 2-Propanol Fuel Cell: A Review from the Perspective of a Hydrogen Energy Economy [J].

Brodt, Matthew ;

Mueller, Karsten ;

Kerres, Jochen ;

Katsounaros, Ioannis ;

Mayrhofer, Karl ;

Preuster, Patrick ;

Wasserscheid, Peter ;

Thiele, Simon .

ENERGY TECHNOLOGY, 2021, 9 (09)

[5] Electrochemically Activatable Liquid Organic Hydrogen Carriers and Their Applications [J].

Cho, Juhyun ;

Kim, Byeongyoon ;

Venkateshalu, Sandhya ;

Chung, Dong Young ;

Lee, Kwangyeol ;

Choi, Sang-Il .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2023, 145 (31) :16951-16965

[6] CO adsorption and oxidation on bimetallic Pt/Ru(0001) surfaces - a combined STM and TPD/TPR study [J].

de Mongeot, FB ;

Scherer, M ;

Gleich, B ;

Kopatzki, E ;

Behm, RJ .

SURFACE SCIENCE, 1998, 411 (03) :249-262

[7] In-situ core-level photoelectron spectroscopy of adsorbates on surfaces involving a molecular beam -: General setup and first experiments [J].

Denecke, R ;

Kinne, M ;

Whelan, CM ;

Steinrück, HP .

SURFACE REVIEW AND LETTERS, 2002, 9 (02) :797-801

[8] Hard x-ray photoemission using standing-wave excitation applied to the MgO/Fe interface [J].

Doering, Sven ;

Schoenbohm, Frank ;

Berges, Ulf ;

Schreiber, Reinert ;

Buergler, Daniel E. ;

Schneider, Claus M. ;

Gorgoi, Mihaela ;

Schaefers, Franz ;

Papp, Christian ;

Balke, Benjamin ;

Fadley, Charles S. ;

Westphal, Carsten .

PHYSICAL REVIEW B, 2011, 83 (16)

[9] MANY-ELECTRON SINGULARITY IN X-RAY PHOTOEMISSION AND X-RAY LINE SPECTRA FROM METALS [J].

DONIACH, S ;

SUNJIC, M .

JOURNAL OF PHYSICS PART C SOLID STATE PHYSICS, 1970, 3 (02) :285-&

[10] Growth and stability of Pt nanoclusters from 1 to 50 atoms on h-BN/Rh(111) [J].

Dull, Fabian ;

Meusel, Manuel ;

Spaeth, Florian ;

Schoetz, Simon ;

Bauer, Udo ;

Bachmann, Philipp ;

Steinhauer, Johann ;

Steinrueck, Hans-Peter ;

Bayer, Andreas ;

Papp, Christian .

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2019, 21 (38) :21287-21295

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