Study of the atomic structure and morphology of the Pt3Co nanocatalyst
| Autor: | Giorgia Greco, Agnieszka Witkowska, E Larquet, Marco Minicucci, Emiliano Principi, A. Di Cicco, Andrea Cognigni, Nicolas Menguy, Y Soldo |
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| Přispěvatelé: | CNISM, Dipartimento di Fisica, Universit`a di Camerino, CNISM, Dipartimento di Fisica, Department of Solid State Physics, Gdansk University of Technology, Department of Solid State Physics, Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces (LEPMI ), Institut de Chimie du CNRS (INC)-Institut National Polytechnique de Grenoble (INPG)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Joseph Fourier - Grenoble 1 (UJF)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Elettra Sincrotrone Trieste, Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
History
Extended X-ray absorption fine structure Chemistry Coordination number Analytical chemistry Nanoparticle Proton exchange membrane fuel cell 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Nanocrystalline material Computer Science Applications Education X-ray absorption fine structure 0103 physical sciences X-ray crystallography Atom [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] 010306 general physics 0210 nano-technology |
| Zdroj: | Journal of Physics Journal of Physics, 2009, 190, pp.012168. ⟨10.1088/1742-6596/190/1/012168⟩ |
| Popis: | International audience; It has been shown that Pt3 Co nanoparticles used as a catalyst for cathode of Proton Exchange Membrane Fuel Cells (PEMFC) enhance oxygen reduction reaction (ORR) activity even by a factor of two compared to pure Pt nanoparticles. The local structure and chemical disorder of a commercially available Pt3 Co nanocatalyst supported on high surface area carbon were investigated. High-quality XAFS spectra were collected at the ELETTRA synchrotron XAFS 11.1 beamline. XAFS spectra analysis have been performed accounting for the reduction of the coordination number and degeneracy of three-body configurations, resulting from transmission electron microscopy (TEM) and x-ray diffraction (XRD) extracted mean particles diameter, size distribution and expected surface atom contributions. The presence of a Co-Co first neighbour EXAFS signal is shown to be related to the degree of the alloy's chemical disorder. This is a good starting point for analyzing the atomic structure of Pt3 Co nanocrystalline system and their changes as a function of alloy preparation or working conditions when they operate as a catalyst in PEMFC. |
| Databáze: | OpenAIRE |
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