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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing

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Visualizing Anisotropic Oxygen Diffusion in Ceria under Activated Conditions.

Liang Zhu^1,2, Xin Jin^1,2, Yu-Yang Zhang²

¹Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

Physical Review Letters

|February 22, 2020

Summary

We visualized oxygen atom diffusion in ceria catalysts, revealing an anisotropic pathway dependent on crystal orientation. This discovery offers insights into cerium oxide

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Fabrication and Operation of an Oxygen Insert for Adherent Cellular Cultures

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Published on: January 6, 2010

Area of Science:

Materials Science
Catalysis Science
Surface Chemistry

Background:

Oxygen reactivity is crucial for ceria-based catalyst performance.
Understanding oxygen diffusion mechanisms is key to optimizing ceria catalysts.

Purpose of the Study:

To investigate oxygen atom diffusion in ceria under activated conditions.
To visualize the real-time diffusion of reactive oxygen atoms.
To elucidate the interplay between cerium and oxygen atoms during transport.

Main Methods:

Aberration-corrected transmission electron microscopy (TEM) for high-resolution imaging.
Molecular dynamics (MD) simulations to model atomic behavior.
Combined experimental and computational approach to study oxygen diffusion.

Main Results:

Direct visualization of reactive oxygen atom diffusion in real-time.
Identification of Coulomb interactions between cerium and oxygen atoms, evidenced by cerium atom buckling.
Discovery of anisotropic oxygen diffusion, with a preferential pathway along the [001] crystallographic direction.

Conclusions:

Anisotropic oxygen diffusion in ceria is confirmed, influenced by crystal orientation.
The findings provide fundamental insights into ceria's catalytic mechanisms.
Opens avenues for designing advanced fluorite-structured oxide materials with tailored anisotropic properties.