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Research Article

Combining in-situ TEM observations and theoretical calculation for revealing the thermal stability of CeO2 nanoflowers

Mingyun Zhu1,§Kuibo Yin1,§( )Yifeng Wen1Shugui Song1Yuwei Xiong1Yunqian Dai2Litao Sun1
SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of EducationSoutheast UniversityNanjing210096China
School of Chemistry and Chemical EngineeringSoutheast UniversityNanjing211189China

§ Mingyun Zhu and Kuibo Yin contributed equally to this work.

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Abstract

The thermal stability of CeO2 nanomaterials can directly impact both the uniformity of the supported catalysts and the catalytic behavior of CeO2 itself. However, knowledge about the thermal stability of CeO2 is still deficient. Here, we conduct in-situ transmission electron microscopy experiments and theoretical calculations to elucidate the thermal stability of CeO2 nanomaterials under different environments. A sinter (< 700 ℃) and a structural decomposition (> 700 ℃) are observed within CeO2 nanoflowers under O2. The sinter firstly occurs among the nanoflowers' monomers and then the sintered nanoparticles structurally decompose to tiny nanoparticles from the strain interface. Under a vacuum environment, the CeO2 nanoflowers firstly undergo a transition from cubic fluorite CeO2 to hexagonal Ce2O3, accompanied by the oxygen release. The Ce2O3 nanoparticles further atomically sublimate from the edges to the center under high temperatures. Theoretical calculation results reveal a considerably lower energy barrier for the structural decomposition under O2 and for the sublimation under vacuum. This work provides a perspective on the structural design and performance optimization of CeO2-based catalysts.

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Nano Research
Pages 1319-1326
Cite this article:
Zhu M, Yin K, Wen Y, et al. Combining in-situ TEM observations and theoretical calculation for revealing the thermal stability of CeO2 nanoflowers. Nano Research, 2022, 15(2): 1319-1326. https://doi.org/10.1007/s12274-021-3659-6
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Received: 18 April 2021
Revised: 22 May 2021
Accepted: 07 June 2021
Published: 07 August 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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