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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Editor-in-Chief: Rademann, Klaus


IMPACT FACTOR 2018: 0.975
5-year IMPACT FACTOR: 1.021

CiteScore 2018: 1.20

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2196-7156
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Volume 227, Issue 9-11

Issues

Initial Sticking Coefficient of H2 on the Pd–Cu(111) Surface Alloy at very Low Coverages

Daniel Farías
  • Corresponding author
  • Instituto de Ciencias de Materiales “Nicolás Cabrera”, Universidad Autónoma de Madrid, Cantoblanco 28049, Spain
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/ Marina Minniti
  • Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, Cantoblanco 28049, Spain
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  • De Gruyter OnlineGoogle Scholar
/ Amjad Al Taleb
  • Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, Cantoblanco 28049, Spain
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Rodolfo Miranda
  • Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Cantoblanco 28049, Spain
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Published Online: 2013-08-05 | DOI: https://doi.org/10.1524/zpch.2013.0392

Abstract

We present an experimental study of the initial dissociative sticking probability of H2 on the Pd–Cu(111) surface alloy at Pd coverages between 1–10%. The measurements have been performed using a supersonic molecular beam with an incident energy range Ei = 75–163 meV. In agreement with a recent STM study, our results confirm that small amounts of Pd atoms significantly increase the reactivity of the inert Cu(111) surface, although the measured initial sticking probability values were found to be much lower than the ones estimated from the STM work. For a Pd coverage of 1% and Ei ∼ 0.10 eV, the H2 initial sticking probability was found to be 2 × 10−3, increasing to 4 × 10−3 for a Pd coverage of 10%. This agrees well with a recent molecular dynamics study, in which the initial sticking probability was estimated in 7 × 10−3 for a Pd coverage of 11% and Ei ∼ 0.15–0.20 eV. Essentially the same values were measured in the whole incident energy range investigated. Therefore, our results support the main conclusion of the molecular dynamics calculations about the mechanism leading to the increase of reactivity of the Pd–Cu(111) surface alloy, which combines a lower activation energy barrier for dissociation of ∼ 0.25 eV on top of substitutional Pd atoms with spillover onto the Cu(111) surface.

Keywords: Surface Alloys; Hydrogen Dissociation; Reactivity

About the article

Received: 2013-01-25

Published Online: 2013-08-05

Published in Print: 2013-11-01


Citation Information: Zeitschrift für Physikalische Chemie, Volume 227, Issue 9-11, Pages 1491–1500, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1524/zpch.2013.0392.

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© 2013 by Walter de Gruyter Berlin Boston. This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. BY-NC-ND 4.0

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