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Published in: Journal of Computational Electronics 3/2020

25-04-2020

A first-principles study of the proton and oxygen migration behavior in the rare-earth perovskite SmNiO3

Authors: Chunfeng Lan, Huanhuan Li, Shuai Zhao

Published in: Journal of Computational Electronics | Issue 3/2020

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Abstract

Transition-metal oxide perovskites usually exhibit mixed ionic and electronic conductivity and have been widely investigated as electrode materials for use in solid-oxide fuel cells. Recently, samarium nickelate SmNiO3 was found experimentally to show promising potential for use in proton-conducting fuel cells. To understand the ionic conductivity of SmNiO3, the oxygen and proton diffusion therein are investigated via density functional theory calculations in this work. Based on the vacancy hopping mechanism, oxygen diffusion in SmNiO3 shows a migration barrier of 0.84 eV. The proton diffusion is studied in terms of different diffusion mechanisms, including reorientation, intraoctahedral, and interoctahedral hopping. The migration barrier for intraoctahedral migration is calculated to be lower than that for interoctahedral hopping. To realize long-range diffusion, the proton is predicted to exhibit reorientation and intraoctahedral hopping. These findings provide a theoretical guide for the development of mixed ionic and electronic perovskite conductors.

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Metadata
Title
A first-principles study of the proton and oxygen migration behavior in the rare-earth perovskite SmNiO3
Authors
Chunfeng Lan
Huanhuan Li
Shuai Zhao
Publication date
25-04-2020
Publisher
Springer US
Published in
Journal of Computational Electronics / Issue 3/2020
Print ISSN: 1569-8025
Electronic ISSN: 1572-8137
DOI
https://doi.org/10.1007/s10825-020-01501-w

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