Enhanced oxygen diffusion in nano-structured ceria

Enhanced oxygen diffusion in nano-structured ceria Nano-structured polycrystalline СеО2 is proposed to be used as a candidate electrolyte material for solid oxide fuel cells (SOFC) operating at temperatures ≤ 600 °С. Here we show that in this material the diffusion activation energy of oxygen ions is 0.35 eV. The diffusion mechanism corresponds to the “single-file” diffusion mechanism, associated with the presence of one-dimensional channels in the anion sublattice of СеО2. The small grain size of the material ≈ 10 nm, as well as its stoichiometric state (Се2О3), minimize the contribution of the electronic and polaron components of the electrical conductivity of this material, which also contribute to the optimization of SOFC operation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science: Materials in Electronics Springer Journals
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Publisher
Springer US
Copyright
Copyright © 2018 by The Author(s)
Subject
Materials Science; Optical and Electronic Materials; Characterization and Evaluation of Materials
ISSN
0957-4522
eISSN
1573-482X
D.O.I.
10.1007/s10854-017-8430-0
Publisher site
See Article on Publisher Site

Abstract

Nano-structured polycrystalline СеО2 is proposed to be used as a candidate electrolyte material for solid oxide fuel cells (SOFC) operating at temperatures ≤ 600 °С. Here we show that in this material the diffusion activation energy of oxygen ions is 0.35 eV. The diffusion mechanism corresponds to the “single-file” diffusion mechanism, associated with the presence of one-dimensional channels in the anion sublattice of СеО2. The small grain size of the material ≈ 10 nm, as well as its stoichiometric state (Се2О3), minimize the contribution of the electronic and polaron components of the electrical conductivity of this material, which also contribute to the optimization of SOFC operation.

Journal

Journal of Materials Science: Materials in ElectronicsSpringer Journals

Published: Jan 15, 2018

References

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