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Combining in-situ TEM observations and theoretical calculation for revealing the thermal stability of CeO2 nanoflowers.
- Source :
- Nano Research; Feb2022, Vol. 15 Issue 2, p1319-1326, 8p
- Publication Year :
- 2022
-
Abstract
- The thermal stability of CeO<subscript>2</subscript> nanomaterials can directly impact both the uniformity of the supported catalysts and the catalytic behavior of CeO<subscript>2</subscript> itself. However, knowledge about the thermal stability of CeO<subscript>2</subscript> is still deficient. Here, we conduct in-situ transmission electron microscopy experiments and theoretical calculations to elucidate the thermal stability of CeO<subscript>2</subscript> nanomaterials under different environments. A sinter (< 700 °C) and a structural decomposition (> 700 °C) are observed within CeO<subscript>2</subscript> nanoflowers under O<subscript>2</subscript>. 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 CeO<subscript>2</subscript> nanoflowers firstly undergo a transition from cubic fluorite CeO<subscript>2</subscript> to hexagonal Ce<subscript>2</subscript>O<subscript>3</subscript>, accompanied by the oxygen release. The Ce<subscript>2</subscript>O<subscript>3</subscript> 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 O<subscript>2</subscript> and for the sublimation under vacuum. This work provides a perspective on the structural design and performance optimization of CeO<subscript>2</subscript>-based catalysts. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19980124
- Volume :
- 15
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Nano Research
- Publication Type :
- Academic Journal
- Accession number :
- 154043019
- Full Text :
- https://doi.org/10.1007/s12274-021-3659-6