Weakly-bound hydrogen on defected Pt(111)
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Jo, Sam K. | - |
dc.date.available | 2020-02-28T09:43:21Z | - |
dc.date.created | 2020-02-06 | - |
dc.date.issued | 2015-05 | - |
dc.identifier.issn | 0039-6028 | - |
dc.identifier.uri | https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/10542 | - |
dc.description.abstract | Step edges and kinks, abundant on multi-faceted nanoparticles, are catalytically active sites. Weakly-bound atomic H, at either topmost surface or subsurface sites, would be important for low-temperature hydrogenation in platinum-based catalysts. Here we report experimental results for such H atoms on Pt(111). Saturation-adsorbed atomic H from molecular H-2 on the defect-free Pt(111) surface indeed gave only a single-peaked H-2 desorption (beta(2)) at 285 K. Instead, defected Pt(111) surfaces rendered triple peaks (beta(1) to beta(3)) including a prominent feature (beta(1)) at as low as 205 K in addition to another desorption (beta(3)) at 360 K. This beta(1)-H state was inhibited and created by pre- and post-adsorbed CO, respectively. We attribute the beta(1)-H desorption to H atoms trapped at interstitial sites beneath surface defects on the basis of: (1) its desorption at a very low temperature in addition to two other peaks from terrace- and defect-adsorbed H; (2) its and total H uptakes by far larger than the surface defect density; (3) its desorption amount up to similar to 3.6 times that of the beta(3) desorption from defects; (4) its complete inhibition by a small pre-coverage of CO; and (5) the complete beta(3)-to-beta(1) H conversion, while the beta(1)-H state remaining intact, by postdosed co. Our proposed mechanism is that the derelaxation (upward lifting) of the H- or CO-bound Pt lattice atoms at (step) defects, as a result of strong H-H and even stronger H-CO lateral repulsions under (near) saturation surface coverages, opens a low-barrier path for H diffusion into the subsurface. (C) 2014 Elsevier B.V. All rights reserved. | - |
dc.language | 영어 | - |
dc.language.iso | en | - |
dc.publisher | ELSEVIER SCIENCE BV | - |
dc.relation.isPartOf | SURFACE SCIENCE | - |
dc.subject | CO ADSORPTION | - |
dc.subject | IN-SITU | - |
dc.subject | LATERAL DISTRIBUTION | - |
dc.subject | VIBRATIONAL-STATES | - |
dc.subject | STEPPED PLATINUM | - |
dc.subject | SURFACE | - |
dc.subject | DESORPTION | - |
dc.subject | DISSOCIATION | - |
dc.subject | ABSORPTION | - |
dc.subject | DYNAMICS | - |
dc.title | Weakly-bound hydrogen on defected Pt(111) | - |
dc.type | Article | - |
dc.type.rims | ART | - |
dc.description.journalClass | 1 | - |
dc.identifier.wosid | 000350929400016 | - |
dc.identifier.doi | 10.1016/j.susc.2014.12.014 | - |
dc.identifier.bibliographicCitation | SURFACE SCIENCE, v.635, pp.99 - 107 | - |
dc.identifier.scopusid | 2-s2.0-84921463508 | - |
dc.citation.endPage | 107 | - |
dc.citation.startPage | 99 | - |
dc.citation.title | SURFACE SCIENCE | - |
dc.citation.volume | 635 | - |
dc.contributor.affiliatedAuthor | Jo, Sam K. | - |
dc.type.docType | Article | - |
dc.subject.keywordAuthor | Subsurface hydrogen absorption | - |
dc.subject.keywordAuthor | Platinum catalyst | - |
dc.subject.keywordAuthor | Hydrogenation | - |
dc.subject.keywordAuthor | Surface defects | - |
dc.subject.keywordAuthor | Co | - |
dc.subject.keywordPlus | CO ADSORPTION | - |
dc.subject.keywordPlus | IN-SITU | - |
dc.subject.keywordPlus | LATERAL DISTRIBUTION | - |
dc.subject.keywordPlus | VIBRATIONAL-STATES | - |
dc.subject.keywordPlus | STEPPED PLATINUM | - |
dc.subject.keywordPlus | SURFACE | - |
dc.subject.keywordPlus | DESORPTION | - |
dc.subject.keywordPlus | DISSOCIATION | - |
dc.subject.keywordPlus | ABSORPTION | - |
dc.subject.keywordPlus | DYNAMICS | - |
dc.relation.journalResearchArea | Chemistry | - |
dc.relation.journalResearchArea | Physics | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Physical | - |
dc.relation.journalWebOfScienceCategory | Physics, Condensed Matter | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
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