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Sulfur poisoning of the CO adsorption on Co(0001)
Laboratory of Physics, Helsinki University of Technology.ORCID-id: 0000-0001-7279-6528
Department of Applied Physics, Aalto University School of Science, Laboratory of Physics, Helsinki University of Technology.
2004 (Engelska)Ingår i: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 573, nr 2, s. 183-190Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

CO adsorption on a sulfur covered cobalt surface at 185 K has been studied using XPS, TDS, LEED, and WF measurements. As in the case of CO adsorption on the clean Co(0001) surface, CO adsorbs and desorbs molecularly and no dissociation was observed. The saturation coverage of CO decreases linearly from 0.54 ML to 0.27 ML when the S pre-coverage increases to 0.25 ML. The WF increased during CO adsorption, but did not reach the value obtained for CO adsorption on the clean surface. The smaller work function change is explained by the reduced adsorption of CO on the sulfur-precovered surface. A reduction in the activation energy of desorption for CO from 113 kJ/mol to 88 kJ/mol was observed indicating weaker bonding of the CO molecules to the surface. The behavior of the CO/S/Co(0001) system was explained by a combination of steric and electronic effects.

Ort, förlag, år, upplaga, sidor
2004. Vol. 573, nr 2, s. 183-190
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URN: urn:nbn:se:ltu:diva-9092DOI: 10.1016/j.susc.2004.09.024Lokalt ID: 7a74109d-cc76-4361-a1f9-aa999264397eOAI: oai:DiVA.org:ltu-9092DiVA, id: diva2:982030
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Upprättat; 2004; 20160504 (andbra)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2017-11-24Bibliografiskt granskad

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