CO adsorption on Cu(1 1 1) and Cu(0 0 1) surfaces: Improving site preference in DFT calculations

Marek Gajdos (Korresp. Autor*in), Juergen Hafner

    Veröffentlichungen: Beitrag in FachzeitschriftArtikelPeer Reviewed

    Abstract

    CO adsorption on Cu(1 1 1) and Cu(0 0 1) surfaces has been studied within ab initio density functional theory (DFT). The structural, vibrational and thermodynamic properties of the adsorbate-substrate complex have been calculated. Calculations within the generalized gradient approximation (GGA) predict adsorption in the threefold hollow on Cu(1 1 1) and in the bridge-site on Cu(0 0 1), instead of on-top as found experimentally. It is demonstrated that the correct site preference is achieved if the underestimation of the HOMO-LUMO gap of CO characteristic for DFT is corrected by applying a molecular DFT + U approach. The DFT + U approach also produces good agreement with the experimentally measured adsorption energies, while introducing only small changes in the calculated geometrical and vibrational properties further improving agreement with experiment which is fair already at the GGA level. Œ 2005 Elsevier B.V. All rights reserved.
    OriginalspracheEnglisch
    Seiten (von - bis)117-126
    Seitenumfang10
    FachzeitschriftSurface Science
    Jahrgang590
    Ausgabenummer2-3
    DOIs
    PublikationsstatusVeröffentlicht - 2005

    ÖFOS 2012

    • 1030 Physik, Astronomie

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