Carbidic and graphitic carbon on Ni(771): aspects for catalysis

  • Haase O
  • Koch R
  • Borbonus M
 et al. 
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Abstract

Vicinal surfaces are often used to model real catalysts, because they exhibit steps and kinks, which are believed to be catalytically active sites. On Ni(771) - a vacinal Ni(110) surface - major differences between carbidic and graphitic carbon were disclosed, using scanning tunneling microscopy, low-energy electron diffraction and Auger electron spectroscopy: The carbidic phase exhibits a (4×1) superstructure affecting only the inner regions of the Ni(110) terraces. Graphitic carbon, on the contrary, forms a macromolecular surface arrangement that preferentially decorates and thus inactivates the catalytically active step sites. © 1992.

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Authors

  • O. Haase

  • R. Koch

  • M. Borbonus

  • K. H. Rieder

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