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Publication Detail
Adsorbate Geometry Specific Subsurface Relaxation in the CO/Pt(111) System
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Wang JX, Robinson I, Adzic RR
  • Publication date:
    2005
  • Pagination:
    24, 26
  • Journal:
    The Journal of Physical Chemistry B
  • Volume:
    109
  • Print ISSN:
    1520-6106
  • Keywords:
    fuelcell, catalysis, carbonmonoxide
  • Notes:
    Important development in the chemistry of catalysis leading to understanding of why large relaxations of the catalyst substrate can arise from molecular packing.
Abstract
A dramatic multilayer substrate relaxation is observed for the (x19 x19)-13CO adlayer phase on a Pt(111) electrode by surface X-ray scattering. Within the (x19 x19) unit cell, a vertical expansion of 0.28 Å was determined for the Pt atoms under near-top-site CO molecules, whereas only 0.04 Å was found under nearbridge- site CO molecules. The lateral displacements involve small rotations toward more symmetric bonding. Both the expansions and rotations extend into the bulk with a decay length of 1.8 Pt layers. This nonuniform layer expansion, hitherto unseen, appears to be a manifestation of the differential stress induced by CO adsorption at different sites.
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