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Atomic-scale imaging of the defect dynamics in ceria nanowires under heating by in situ aberration-corrected TEM

  • Xiaomin Li
  • Kaihui LiuEmail author
  • Wenlong Wang
  • Xuedong BaiEmail author
Articles
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Abstract

The defects in the ceria usually work as the active reaction sites in their industrial applications. In this article, we studied the formation and atomic process of the defects of ceria nanowires under heating by using in situ aberration-corrected transmission electron microscopy (Cs-TEM) method. With the temperature elevating, ceria nanowires are reduced and defects begin to appear and grow up. When temperature reaches 1,023 K, the defect morphology exhibits the rhombus or hexagon patterns, which are surrounded by {111} and {200} planes with lower surface energy, and the heated ceria still maintain the same cubic fluorite structure as their parent. It is also indicated that the formation of defects originates from the release of lattice oxygen and the volatilization of surface Ce ions. This work provides an important insight into designing ceria-based catalysts and ionic conductors.

Keywords

ceria defects heating in situ transmission electron microscopy 

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Notes

Acknowledgements

This work was supported by the Program from Chinese Academy of Sciences (ZDYZ2015-1, XDB30000000, XDB07030100, Y8K5261B11), the National Natural Science Foundation of China (21773303, 21872172, 51472267, 51672007, 221322304, 11290161, 51572233, 61574121, 51421002), the National Key Research and Development Program (2016YFA0300804, 2016YFA0300903), and the National Program for Thousand Young Talents of China.

Supplementary material

11426_2019_9624_MOESM1_ESM.pdf (321 kb)
Atomic-scale imaging of the defect dynamics in ceria nanowires under heating by in situ aberration-corrected TEM

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.International Center for Quantum Materials and School of PhysicsPeking UniversityBeijingChina
  2. 2.Beijing National Laboratory for Condensed Matter Physics, Institute of PhysicsChinese Academy of SciencesBeijingChina
  3. 3.Songshan Lake Materials LaboratoryDongguanChina
  4. 4.School of Physical ScienceUniversity of Chinese Academy of SciencesBeijingChina

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