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

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• 作者：Mohammad K. El Jawad ; Bruno Gilles ; Frédéric Maillard
• 关键词：Molecular beam epitaxy ; Single crystals ; Platinum ; Strain effect ; Ligand effect
• 刊名：Electrocatalysis
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：6
• 期：4
• 页码：398-404
• 全文大小：1,006 KB
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• 作者单位：Mohammad K. El Jawad (1) (2) (3) (4)
  Bruno Gilles (3) (4)
  Frédéric Maillard (1) (2)
  
  1. Univ. Grenoble Alpes, LEPMI, 38000, Grenoble, France
  2. CNRS, LEPMI, 38000, Grenoble, France
  3. Univ. Grenoble Alpes, SIMAP, 38000, Grenoble, France
  4. CNRS, SIMAP, 38000, Grenoble, France
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Electrochemistry
  Physical Chemistry
  Energy Technology
  
• 出版者：Springer New York
• ISSN：1868-5994

文摘

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.