Affordable Access

Publisher Website

Dynamical rearrangements of the (2×1)O adlayer during CO oxidation on Cu(1 1 0)

Authors
Journal
Surface Science
0039-6028
Publisher
Elsevier
Publication Date
Volume
516
Issue
3
Identifiers
DOI: 10.1016/s0039-6028(02)02050-2
Keywords
  • Scanning Tunneling Microscopy
  • Catalysis
  • Oxidation
  • Surface Diffusion
  • Copper
  • Low Index Single Crystal Surfaces

Abstract

Abstract Scanning tunneling microscopy has been used to visualize dynamical rearrangements of the (2×1)O adlayer on Cu(1 1 0) during reaction with CO. Taking an initially fully oxygen covered surface at 350 K, the reaction starts at terrace edges, where vacant sites for CO adsorption exist. The reaction then proceeds almost uniformly perpendicular to these terrace edges leaving the bare surface behind. In contrast, starting with an initially fully oxygen covered surface at 470 K, the reaction results in the formation of fingerlike structures at the terrace edges. In subsequent images these fingers of bare surface area extend deep into the original adlayer along the [0 0 1] direction, i.e. along the Cu–O–Cu-chains, while the reaction along the [1 1 0] direction, i.e. perpendicular to the chains, appears to proceed uniformly exhibiting a comparatively straight adlayer boundary all the time. The observations are discussed taking into account the complex adsorbate–adsorbate interactions of the Cu–O compounds and the high mobility of these species at 470 K.

There are no comments yet on this publication. Be the first to share your thoughts.