Adsorption of H2O on oxidized Fe(100) surfaces: comparison between the oxidation of iron by H2O and O2

W. H. Hung, J. Schwartz, S. L. Bernasek

Research output: Contribution to journalArticle

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Abstract

The adsorption and reaction of water on the preoxidized Fe(100) surface is studied using LEED, AES, thermal desorption and high resolution EELS. Oxidation of the Fe(100) surface by water adsorption results in a disordered c(2 × 2) surface, with a saturation oxygen coverage of 0.39 ML. This surface cannot be further oxidized by exposure to water, but can be further oxidized by molecular oxygen. When water is adsorbed on the submonolayer oxygen pre-exposed surface, hydrogen transfer from water to adsorbed atomic oxygen occurs, forming a hydroxyl group. This group migrates from the fourfold hollow site, where it is formed, to the bridge site on this surface. Adsorbed oxygen facilitates water decomposition via this hydrogen transfer process. On the oxygen precovered surface with an oxygen coverage of 1 ML (p(1 × 1)O surface), water adsorbs molecularly and desorbs at 175 K without decomposition.

Original languageEnglish
Pages (from-to)21-32
Number of pages12
JournalSurface Science
Volume294
Issue number1-2
DOIs
Publication statusPublished - 1993 Sep 1

Fingerprint

Iron
Adsorption
iron
Oxidation
oxidation
adsorption
Oxygen
oxygen
Water
water
Hydrogen
Decomposition
decomposition
Thermal desorption
Molecular oxygen
Electron energy loss spectroscopy
hydrogen
surface water
Surface waters
Hydroxyl Radical

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Adsorption of H2O on oxidized Fe(100) surfaces : comparison between the oxidation of iron by H2O and O2. / Hung, W. H.; Schwartz, J.; Bernasek, S. L.

In: Surface Science, Vol. 294, No. 1-2, 01.09.1993, p. 21-32.

Research output: Contribution to journalArticle

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