Surface reaction studies of water and oxygen with polycrystalline Ni3Fe: Evidence of water dissociation to produce hydrogen and its suppression by oxygen coadsorption

W. J. Chia*, Y. W. Chung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The interaction of water vapor and oxygen with polycrystalline Ni3Fe has been studied by Auger electron spectroscopy, X-ray photoelectron spectroscopy (XPS) and thermal desorption. Water adsorbs molecularly on the surface at or below 150 K. Between 150 and 200 K, some adsorbed water molecules desorb in vacuum, while others dissociate into hydroxyls, atomic oxygen, and hydrogen. XPS studies suggest iron to be the active species in controlling the dissociation of water on polycrystalline Ni3Fe surface. Water dissociation into atomic hydrogen is greatly suppressed by the presence of small concentrations of oxygen in water vapor.

Original languageEnglish (US)
Pages (from-to)283-288
Number of pages6
JournalIntermetallics
Volume4
Issue number4
DOIs
StatePublished - 1996

Keywords

  • A. Model systems
  • B. Environmental embrittlement
  • B. Hydrogen embrittlements

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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