Carbon deposition by disproportionation of CO on a Ni(977) surface

H. Nakano, S. Kawakami, T. Fujitani, J. Nakamura

Research output: Contribution to journalConference articlepeer-review

48 Citations (Scopus)

Abstract

The carbon deposition by disproportionation of CO (2COg→Ca+CO2,g) on a Ni(977) surface was studied by scanning tunneling microscopy (STM), Auger electron spectroscopy (AES) and low energy electron diffraction (LEED) to examine the effect of the step-edges on the dissociation of CO. The initial reaction probability, e.g. 0.16 at 350 K, was greater than those reported for Ni(100) and Ni(110). The apparent activation energy was found to be negative, which is similar to the results for Ni(100) and sputter-damaged Ni(100). It was suggested that CO dissociates at the step-edges and then carbon migrates to the terrace sites. Three or four layers of bulk carbide were formed on Ni(977) at 500 K, suggesting that carbidic carbon penetrates into the bulk from the step-edge. A single domain of the reconstructed (111) terrace was observed upon the carbide formation over Ni(977) by LEED, although six domains of the reconstructed (111) called `clock reconstruction' are usually seen on a carbided Ni(111) surface.

Original languageEnglish
Pages (from-to)295-299
Number of pages5
JournalSurface Science
Volume454
Issue number1
DOIs
Publication statusPublished - May 20 2000
Externally publishedYes
EventECOSS-18: 18th European Conference on Surface Science - Vienna, Austria
Duration: Sep 21 1999Sep 24 1999

All Science Journal Classification (ASJC) codes

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

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