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

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

34 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
頁(從 - 到)21-32
頁數12
期刊Surface Science
294
發行號1-2
DOIs
出版狀態已發佈 - 1993 九月 1

ASJC Scopus subject areas

  • 凝聚態物理學
  • 表面和介面
  • 表面、塗料和薄膜
  • 材料化學

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