Visualizing Anisotropic Oxygen Diffusion in Ceria under Activated Conditions

Liang Zhu, Xin Jin, Yu-Yang Zhang, Shixuan Du, Lei Liu, Tijana Rajh, Zhi Xu, Wenlong Wang, Xuedong Bai, Jianguo Wen, and Lifen Wang
Phys. Rev. Lett. 124, 056002 – Published 5 February 2020
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Abstract

Oxygen reactivity plays a key role in the performance of ceria-based catalysts. Aberration-corrected transmission electron microscopy and molecular dynamics simulations were used to study the oxygen atom diffusion in ceria under activated conditions. Reactive oxygen atom and its real-time diffusion were visualized. The interplay between cerium and oxygen atoms originating from a Coulomb interaction was revealed by the out-of-plane buckling of cerium atoms associated with oxygen transport. Anisotropic oxygen atom diffusion that depends on crystal orientations was discovered, demonstrating a preferential [001] crystallographic diffusion pathway. These findings reveal prospects for applications of anisotropic orientation-relevant fluorite-structured oxides.

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  • Received 25 October 2019
  • Revised 16 December 2019
  • Accepted 8 January 2020

DOI:https://doi.org/10.1103/PhysRevLett.124.056002

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Liang Zhu1,2, Xin Jin1,2, Yu-Yang Zhang2,*, Shixuan Du1,2,5, Lei Liu3,†, Tijana Rajh4, Zhi Xu1,2,5, Wenlong Wang1,2,5, Xuedong Bai1,2,5,‡, Jianguo Wen4,§, and Lifen Wang1,4,║

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 2School of Physical Sciences and CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China
  • 3Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
  • 4Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, USA
  • 5Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China

  • *zhangyuyang@ucas.ac.cn
  • leiliu1@pku.edu.cn
  • xdbai@iphy.ac.cn
  • §jwen@anl.gov
  • wanglf@iphy.ac.cn

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Issue

Vol. 124, Iss. 5 — 7 February 2020

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