The Effect of CO and H Chemisorption on the Chemical Ordering of Bimetallic Clusters (Articolo in rivista)

Type
Label
  • The Effect of CO and H Chemisorption on the Chemical Ordering of Bimetallic Clusters (Articolo in rivista) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/jp108387x (literal)
Alternative label
  • West P. S., Johnston R. L., Barcaro G., Fortunelli A. (2010)
    The Effect of CO and H Chemisorption on the Chemical Ordering of Bimetallic Clusters
    in Journal of physical chemistry. C; ACS, American chemical society, Washington, DC (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • West P. S., Johnston R. L., Barcaro G., Fortunelli A. (literal)
Pagina inizio
  • 19678 (literal)
Pagina fine
  • 19686 (literal)
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  • 114 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 9 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Istituto per i Processi Chimico-Fisici del Consiglio Nazionale delle Ricerche (IPCF-CNR), Via G. Moruzzi 1, I-56124, Pisa, Italy School of Chemistry, UniVersity of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom (literal)
Titolo
  • The Effect of CO and H Chemisorption on the Chemical Ordering of Bimetallic Clusters (literal)
Abstract
  • The effect of alloying on ligand adsorption energies and how this can modify the segregation patterns of selected binary nanoalloys is studied via first-principles total energy calculations. A model setup is considered, in which high-symmetry 38-atom truncated-octahedral (TO) clusters with compositions A6B32 and B6A32 are used as substrates to bind a single CO molecule or H atom in centroid sites for the following (A,B) pairs: (Au,Pd), (Pd,Pt), and (Cu,Pt), and the relative changes in the energetics of the systems upon ligand coordination are analyzed. We find qualitative similarities but quantitative differences between the CO and H cases (as examples of reducing agents), and a wide variety of behavior for the three (A,B) pairs. In AuPd, Pd-CO bonding is not strongly affected by neighboring Au atoms but the PdcoreAusurface segregation pattern (favored for bare particles) is expected to be inverted in the presence of CO coordinating species. At the other extreme, in CuPt, both Pt-CO and Pt-H bonding is strongly enhanced by neighboring Cu atoms, but the predicted segregation pattern differs from that expected on the basis of results for extended systems due to finite-size effects. (literal)
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