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Topics in Catalysis
Published in: Topics in Catalysis 6-7/2017

14-09-2016 | Original Paper

Atomic Ordering and Sn Segregation in Pt–Sn Nanoalloys Supported on CeO2 Thin Films

Authors: Armin Neitzel, Gábor Kovács, Yaroslava Lykhach, Sergey M. Kozlov, Nataliya Tsud, Tomáš Skála, Mykhailo Vorokhta, Vladimír Matolín, Konstantin M. Neyman, Jörg Libuda

Published in: Topics in Catalysis | Issue 6-7/2017

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Abstract

The stability and atomic ordering in Pt–Sn nanoalloys supported on CeO2 thin films have been studied by means of synchrotron radiation photoelectron spectroscopy and density functional calculations. Using CO molecules as a probe, we explored the development of the surface structure of supported Pt–Sn nanoalloys with respect to a reference Pt/CeO2 model system. We found a significant decrease in the density of CO adsorption sites on supported Pt–Sn nanoalloys caused by Sn segregation to the surface upon annealing. Additionally, we found that atomic ordering in Pt–Sn nanoalloys is driven by the balance between the surface segregation energy of Sn atoms and the energy of heteroatomic bond formation. Our calculations demonstrate a clear tendency for Sn segregation to the nanoalloy surface. For Pt105Sn35 and Pt1097Sn386 nanoparticles, we calculated a surface stoichiometry of Pt2Sn which is only slightly dependent on temperature in thermodynamic equilibrium. The analysis of Bader charges in Pt–Sn nanoalloys revealed a strong correlation between the charge and the coordination number of Sn atoms with respect to Pt neighbors. In particular, the magnitude of the charge transfer from Sn to Pt increases as a function of the Sn coordination number.
previous article Cerium Oxide Epitaxial Nanostructures on Pt(111): Growth, Morphology and Structure
next article Photo-Induced Morphology Changes at the RuO2(110)/TiO2(110) Surface: A Scanning Tunneling Microscopy Study

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Metadata
Title
Atomic Ordering and Sn Segregation in Pt–Sn Nanoalloys Supported on CeO2 Thin Films
Authors
Armin Neitzel
Gábor Kovács
Yaroslava Lykhach
Sergey M. Kozlov
Nataliya Tsud
Tomáš Skála
Mykhailo Vorokhta
Vladimír Matolín
Konstantin M. Neyman
Jörg Libuda
Publication date
14-09-2016
Publisher
Springer US
Published in
Topics in Catalysis / Issue 6-7/2017
Print ISSN: 1022-5528
Electronic ISSN: 1572-9028
DOI
https://doi.org/10.1007/s11244-016-0709-5

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