e-Journal of Surface Science and Nanotechnology
Online ISSN : 1348-0391
Conference -ISSS-8-
Theoretical Investigation of Surface Oxidation of NiO/Au Core-Shell Catalyst
Akihide HayashiYoshinori AtoKohei TadaHiroaki KogaTakashi KawakamiShusuke YamanakaMitsutaka Okumura
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2018 Volume 16 Pages 242-246

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Abstract

The surface oxidation of a Au@NiO core-shell catalyst is the key to its catalytic activity. In this density functional theory (DFT) study, we explain why the Au core promotes the oxidation of the NiO shell. The Au@NiO catalyst is represented by a slab model in which NiO(001) layers are placed on Au(001) substrates (NiO/Au). Ni vacancy and oxygen adsorption are examined as the surface oxidized state. Spin density analysis, as well as differential charge density analysis, shows that the oxidation of NiO/Au depletes the electrons in the Au—O antibonding orbitals at the interface, instead of creating holes in NiO. Thus, the highly-oxidized state of the NiO shell is stabilized by its interaction with the Au core. [DOI: 10.1380/ejssnt.2018.242]

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