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First principles study of H2O molecule adsorption on Fe(100), Fe(110) and Fe(111) surfaces

Zhao Wei Wang Jia-Dao Liu Feng-Bin Chen Da-Rong

First principles study of H2O molecule adsorption on Fe(100), Fe(110) and Fe(111) surfaces

Zhao Wei, Wang Jia-Dao, Liu Feng-Bin, Chen Da-Rong
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  • Abstract views:  3511
  • PDF Downloads:  1621
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Publishing process
  • Received Date:  14 May 2008
  • Accepted Date:  06 August 2008
  • Published Online:  20 May 2009

First principles study of H2O molecule adsorption on Fe(100), Fe(110) and Fe(111) surfaces

  • 1. 清华大学摩擦学国家重点实验室,北京 100084

Abstract: The adsorption of H2O on Fe(100), Fe(110) and Fe(111) crystal surfaces were studied by first principles. The calculation results indicate that H2O monomers bind preferentially at top sites and lie nearly flat on the three crystal surfaces. The results of adsorption energy and geometry structure show that the effect of H2O adsorbed on three iron crystal surfaces is different. The strongest interaction occurred between H2O and Fe(111) crystal surface and the weakest interaction is between H2O and Fe(110) crystal surface. Such relationship is related to the different surface atoms density. The similar conclusion can be drawn from the calculation results of electronic structure and Mulliken analysis. The Mulliken analysis also indicates that when H2O is adsorbed on the iron surface, charge exchange between O atom and Fe atom make the iron surface negatively charged and reduce the surface potential, which promote the electrochemical corrosion of iron surfaces.

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