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  Potential-Induced Segregation Phenomena in Bimetallic PtAu Nanoparticles: An In Situ Near-Ambient-Pressure Photoelectron Spectroscopy Study

Papaefthimiou, V., Diebold, M., Ulhaq-Bouillet, C., Doh, W. H., Blume, R., Zafeiratos, S., et al. (2015). Potential-Induced Segregation Phenomena in Bimetallic PtAu Nanoparticles: An In Situ Near-Ambient-Pressure Photoelectron Spectroscopy Study. ChemElectroChem, 2(10), 1519-1526. doi:10.1002/celc.201500188.

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 Creators:
Papaefthimiou, Vasiliki1, Author
Diebold, Morgane1, Author
Ulhaq-Bouillet, Corinne2, Author
Doh, Won Hui1, Author
Blume, Raoul3, 4, Author              
Zafeiratos, Spyridon1, Author
Savinova, Elena R.1, Author
Affiliations:
1ICPEES, UMR 7515 du CNRS-UdS, 25 Rue Becquerel, 67087 Strasbourg (France), ou_persistent22              
2CNRS UMR 7504, Institut de Physique et de Chimie des Matériaux de Strasbourg, 23 Rue du Loess, 67034 Strasbourg (France), ou_persistent22              
3Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
4Abt. Solarenergieforschung, Helmhotz-Zentrum Berlin, ou_persistent22              

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Free keywords: cyclic voltammetry; fuel cells; nanoparticles; photoelectron spectroscopy; platinum/gold
 Abstract: The surface properties of a model membrane electrode assembly of a high-temperature proton-exchange-membrane fuel cell with a nanostructured PtAu working electrode were studied under operando conditions (polarization, humidified H2 atmosphere, 150 °C) using near-ambient-pressure photoelectron spectroscopy (NAP–XPS). NAP–XPS proved to be a powerful tool for the in situ investigation of the changes in the chemical composition, the segregation of the two metals, and the changes in their oxidation state. Nondestructive depth profiling revealed the influence of the polarization and the gas ambient on the distribution of the two metals in the near-surface region. The results suggest that the surface of the electrode is covered by a thin layer of gold, which is stable at potentials below the onset of surface-oxide formation. Anodic oxidation of the PtAu electrode pulls Pt to the surface, leading to intermixing of Pt and Au atoms and the formation of an interfacial alloy

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Language(s): eng - English
 Dates: 2015-05-032015-07-312015-10
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/celc.201500188
 Degree: -

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Title: ChemElectroChem
  Abbreviation : ChemElectroChem
Source Genre: Journal
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Publ. Info: Weinheim, Germany : WILEY-VCH Verlag GmbH & Co. KGaA
Pages: 8 Volume / Issue: 2 (10) Sequence Number: - Start / End Page: 1519 - 1526 Identifier: ISSN: 2196-0216
CoNE: https://pure.mpg.de/cone/journals/resource/2196-0216