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Electrooxidation of CO and H-2/CO mixtures on Pt(111) in acid solutions
dc.creator | Marković, NM | |
dc.creator | Grgur, Branimir | |
dc.creator | Lucas, CA | |
dc.creator | Ross, PN | |
dc.date.accessioned | 2021-03-10T09:48:37Z | |
dc.date.available | 2021-03-10T09:48:37Z | |
dc.date.issued | 1999 | |
dc.identifier.issn | 1089-5647 | |
dc.identifier.uri | http://TechnoRep.tmf.bg.ac.rs/handle/123456789/247 | |
dc.description.abstract | Electrocatalysis 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.publisher | Amer Chemical Soc, Washington | |
dc.rights | restrictedAccess | |
dc.source | Journal of Physical Chemistry B | |
dc.title | Electrooxidation of CO and H-2/CO mixtures on Pt(111) in acid solutions | en |
dc.type | article | |
dc.rights.license | ARR | |
dc.citation.epage | 495 | |
dc.citation.issue | 3 | |
dc.citation.other | 103(3): 487-495 | |
dc.citation.rank | M21 | |
dc.citation.spage | 487 | |
dc.citation.volume | 103 | |
dc.identifier.doi | 10.1021/jp983177c | |
dc.identifier.scopus | 2-s2.0-0002885507 | |
dc.identifier.wos | 000079043000014 | |
dc.type.version | publishedVersion |