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dc.creatorMarković, NM
dc.creatorGrgur, Branimir
dc.creatorLucas, CA
dc.creatorRoss, PN
dc.date.accessioned2021-03-10T09:48:37Z
dc.date.available2021-03-10T09:48:37Z
dc.date.issued1999
dc.identifier.issn1089-5647
dc.identifier.urihttp://TechnoRep.tmf.bg.ac.rs/handle/123456789/247
dc.description.abstractElectrocatalysis of CO oxidation and the interfacial structure of the CO adlayer (COad) on the Pt(111) surface in 0.5 M H2SO4 were examined by using the rotating disk electrode method in combination with in situ surface X-ray diffraction measurements. The results presented here elucidate the roles played by two different forms of COad: one which is oxidized at lower overpotentials, in the so-called preoxidation region, we characterize as a weakly adsorbed state (COad.w), and a strongly adsorbed state (COad,s) which is oxidized at higher overpotentials. The COad,w state forms at saturation coverage by adsorption at E lt 0.15 V and assumes a compressed p(2 x 2) structure containing 3 CO molecules in the unit cell (0.75 CO/Pt). We propose that oxidative removal of COad,w is accompanied by simultaneous relaxation of the CO adlayer, and that the remaining COad (approximate to 0.6 CO/Pt) assumes a new bonding state which we identify as COad,s. The COad,s state is present in a structure lacking long-range order. Despite the reduced coverage by COad, H-2 electrooxidation is still completely poisoned at potentials below 0.6 V. The electrooxidation of CO in solution is proposed to occur via the COad,w state at 0.6-0.8 V, and via the COad,s at higher potentials.en
dc.publisherAmer Chemical Soc, Washington
dc.rightsrestrictedAccess
dc.sourceJournal of Physical Chemistry B
dc.titleElectrooxidation of CO and H-2/CO mixtures on Pt(111) in acid solutionsen
dc.typearticle
dc.rights.licenseARR
dc.citation.epage495
dc.citation.issue3
dc.citation.other103(3): 487-495
dc.citation.rankM21
dc.citation.spage487
dc.citation.volume103
dc.identifier.doi10.1021/jp983177c
dc.identifier.scopus2-s2.0-0002885507
dc.identifier.wos000079043000014
dc.type.versionpublishedVersion


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