DFT+U Study on the oxygen adsorption and dissociation on CeO2-supported Pt4 cluster

Material type: 文書・図像類

Author: Nguyen, Tien Quangほか

Publisher: Elsevier B.V.

Publication date: 2014-01

Material Format: Digital

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Note (General)：: We investigated the reactivity of CeO2- supported Pt4 cluster (denoted as Pt4/CeO2(111)) towards O2 adsorption and dissociation as well as the geometr...

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Material Type: 文書・図像類
Title: DFT+U Study on the oxygen adsorption and dissociation on CeO2-supported Pt4 cluster
Author/Editor: Nguyen, Tien Quang
Escano, Mary Clare Sison
Nakanishi, Hiroshi
Kasai, Hideaki
Maekawa, Hiroyoshi
Osumi, Kazuo
Sato, Kaoru
Author Heading: Nguyen, Tien Quang
Escano, Mary Clare Sison
Nakanishi, Hiroshi
Kasai, Hideaki
Maekawa, Hiroyoshi
Osumi, Kazuo
Sato, Kaoru
Publication, Distribution, etc.: Elsevier B.V.
Publication Date: 2014-01
Publication Date (W3CDTF): 2014-01
Periodical title: Applied Surface Science
No. or year of volume/issue: 288
Volume: 288
Pages: 244-250
Text Language Code: eng
Target Audience: 一般
Note (General): We investigated the reactivity of CeO2- supported Pt4 cluster (denoted as Pt4/CeO2(111)) towards O2 adsorption and dissociation as well as the geometry/electronic properties associated with such metal oxide supported cluster system using Density Functional Theory and on-site Coulomb interaction correction via the Hubbard-like term, U (DFT+U). It was found that Pt4 binds strongly to CeO2(111) via Pt-O-Ce bonds which act as “anchors" between the surface and the cluster, confirming its non-sintering as found in experiments. The adsorption of the cluster involves net electron transfer to CeO2, however, charge redistribution also happens within the cluster (from Pt atom bonded to the surface to the Pt on top of the cluster). This charge couples to the top Pt leading to reduce its spin moment as compared to that of unsupported cluster. When O2 adsorbs on Pt4/CeO2(111), while it prefers Pt vertex site near the CeO2 surface, the O-O bond elongation is more profound at the Pt-Pt edges. The energy barrier for dissociating O2 from this edge site precursor state is smallest. A correlation between the O-O bond length at the precursor state and the stability at the transition state is revealed. Finally, the barrier for dissociation in unsupported Pt4 is lower, indicating suppression of the cluster's reactivity due to the support. We attribute this to the hybridization of Pt-5d orbitals with O-2p orbitals in CeO2(111) leading to the broadening of Pt- 5d states near the Fermi level.
Access Restrictions: 限定公開
Rights (production): (c) 2014 Elsevier B.V.
Related Material (DOI): 10.015
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 福井大学 : 福井大学学術機関リポジトリ