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Topics in Catalysis

, Volume 61, Issue 12–13, pp 1227–1236 | Cite as

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

  • Yan Wang
  • Shanwei Hu
  • Qian Xu
  • Huanxin Ju
  • Junfa Zhu
Original Paper
  • 124 Downloads

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.

Keywords

Ceria Samarium Model catalyst XPS STM 

Notes

Acknowledgements

The authors gratefully acknowledge the National Natural Science Foundation of China (Nos. U1732272, 21473178 and 21403205), National Key R&D Program of China (No. 2017YFA0403402), China Postdoctoral Science Foundation (BH2310000032), and Chinese Universities Scientific Fund (WK2310000068) for the financial support of this work.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Yan Wang
    • 1
  • Shanwei Hu
    • 1
  • Qian Xu
    • 1
  • Huanxin Ju
    • 1
  • Junfa Zhu
    • 1
  1. 1.National Synchrotron Radiation Laboratory and Collaborative Innovation Center of Suzhou Nano Science and TechnologyUniversity of Science and Technology of ChinaHefeiPeople’s Republic of China

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