Enhanced reactivity of adsorbed oxygen on Pd(111) induced by compression of the oxygen layer

S. H. Kim, J. Méndez, J. Wintterlin, and G. Ertl
Phys. Rev. B 72, 155414 – Published 17 October 2005

Abstract

The reaction between O atoms and CO molecules on Pd(111) was investigated by scanning tunneling microscopy (STM). CO was dosed on the (2×2)O-covered surface at temperatures between 100 and 190K, and the structure changes were monitored by STM. CO adsorption causes compression of the (2×2)O overlayer into islands of the (2×1)O structure, followed by reaction of the O atoms to give CO2. The (2×2)O overlayer does not react with CO at temperatures up to 180K, whereas the (2×1)O phase reacts at temperatures as low as 136K. The analysis of the reaction kinetics reveals an activation energy for the O+CO reaction of 0.4eV and a reaction order of 1 with respect to the O coverage.

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  • Received 25 April 2005

DOI:https://doi.org/10.1103/PhysRevB.72.155414

©2005 American Physical Society

Authors & Affiliations

S. H. Kim1,*, J. Méndez1,†, J. Wintterlin2, and G. Ertl1

  • 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
  • 2Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 11, D-81377 Munich, Germany

  • *Corresponding author. Present address: Lawrence Berkeley National Laboratory, Materials Sciences Division, Berkeley, California 94720, USA. Email address: shkim@stm.lbl.gov
  • Present address: Instituto de Ciencia de Materiales de Madrid CSIC, E-28049 Madrid, Spain

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Issue

Vol. 72, Iss. 15 — 15 October 2005

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