Adsorption of hydrogen on clean and modified magnesium films

Martin Johansson, Christopher Worsøe Ostenfeld, Ib Chorkendorff

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Abstract

The sticking of hydrogen on 400 A thick magnesium films, grown under ultrahigh vacuum conditions, have been measured under conditions relevant for hydrogen storage, i.e., elevated temperatures and pressures. A model which describes the hydrogenation and desorption kinetics of the pure magnesium films at H/Mg ratios less than 2% is developed. The activation barrier for hydrogen dissociation is 72 +/- 15 kJ/mole H-2, and a stagnant hydrogen uptake is observed. For platinum-catalyzed films, the barrier is significantly reduced, and there is no stagnation in the uptake rate.
Original languageEnglish
JournalPhysical Review B Condensed Matter
Volume74
Issue number19
Pages (from-to)193408
ISSN0163-1829
DOIs
Publication statusPublished - 2006

Bibliographical note

Copyright 2006 American Physical Society

Keywords

  • MG
  • ACTIVATION
  • MG(0001) SURFACE
  • H-2
  • CU(111)
  • DISSOCIATION
  • STORAGE MATERIALS
  • REACTIVITY

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