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Topics in Catalysis

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11-05-2018 | Original Paper

Sm on CeO₂(111): A Case for Ceria Modification via Strong Metal–Ceria Interaction

Authors: Yan Wang, Shanwei Hu, Qian Xu, Huanxin Ju, Junfa Zhu

Published in: Topics in Catalysis | Issue 12-13/2018

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Abstract

The growth, electronic structure and stability of Sm on ordered CeO₂(111) thin films grown on Cu(111) were investigated by means of X-ray photoelectron spectroscopy (XPS), low energy electron diffraction, and scanning tunneling microscopy (STM). Metallic samarium was deposited on the CeO₂(111) surface by thermal evaporation under ultrahigh vacuum conditions at room temperature. The XPS data suggest that metallic Sm is oxidized to Sm³⁺ upon the deposition of Sm on CeO₂, accompanied by the reduction of Ce⁴⁺ to Ce³⁺. With increasing the Sm coverage, the concentration of Ce³⁺ increases monotonically. After depositing 6 ML of Sm, only Ce³⁺ is observed within the detection depth of XPS. The STM results indicate that Sm exhibits a two-dimensional growth on the CeO₂(111) surface at low coverages. Annealing to higher temperatures leads to the agglomeration of Sm particles and concurrent diffusion of Sm into the ceria film. These results illustrate that Sm can modify both the electronic and structural properties of ceria.

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Title: Sm on CeO2(111): A Case for Ceria Modification via Strong Metal–Ceria Interaction
Authors: Yan Wang
Shanwei Hu
Qian Xu
Huanxin Ju
Junfa Zhu
Publication date: 11-05-2018
Publisher: Springer US
Published in: Topics in Catalysis / Issue 12-13/2018
Print ISSN: 1022-5528
Electronic ISSN: 1572-9028
DOI: https://doi.org/10.1007/s11244-018-0977-3

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