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Structure and Surface Reactivity of Ultra-Thin Pt/W(111) Films

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Abstract

We report on the structure, the chemisorption and the electrocatalytic properties of multilayer (2.2, 3.3 and 5.5 physical monolayers) Pt films deposited on W(111) elaborated by molecular beam epitaxy. The Pt/W(111) surfaces were characterized by low-energy electron diffraction (LEED), X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry (CV). Pronounced changes of the surface reactivity were noticed as the Pt coverage is decreased. In particular, the affinity for under-potentially deposited hydrogen (Hupd) and hydroxyl (OHads) species and the ability to electrooxidize a monolayer of COads were depreciated in agreement with strain and ligand effects.

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Notes

  1. Bulk W crystallizes in body centred cubic (bcc) structure with a lattice parameter equal to 0.3165 nm, while Pt adopts the face centred cubic (fcc) structure with a lattice parameter equal to 0.3924 nm.

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Disclosure of Potential Conflict of Interest

The authors declare that they have no conflict of interest (financial or non-financial).

Funding

This study was funded by Oseo-Anvar in the framework of the H2E project.

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Authors and Affiliations

  1. Univ. Grenoble Alpes, LEPMI, 38000, Grenoble, France

    Mohammad K. El Jawad & Frédéric Maillard

  2. CNRS, LEPMI, 38000, Grenoble, France

    Mohammad K. El Jawad & Frédéric Maillard

  3. Univ. Grenoble Alpes, SIMAP, 38000, Grenoble, France

    Mohammad K. El Jawad & Bruno Gilles

  4. CNRS, SIMAP, 38000, Grenoble, France

    Mohammad K. El Jawad & Bruno Gilles

Authors
  1. Mohammad K. El Jawad
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  2. Bruno Gilles
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  3. Frédéric Maillard
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Correspondence to Bruno Gilles or Frédéric Maillard.

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El Jawad, M.K., Gilles, B. & Maillard, F. Structure and Surface Reactivity of Ultra-Thin Pt/W(111) Films. Electrocatalysis 6, 398–404 (2015). https://doi.org/10.1007/s12678-015-0260-3

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