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Issue 18, 2012
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Vacancy and interstitial oxide ion migration in heavily doped La2−xSrxCoO4±δ†

Cristina Tealdi,*ab   Chiara Ferrara,b   Piercarlo Mustarellib  and  M. Saiful Islamc  
Author affiliations

* Corresponding authors

a INSTM Consortium – Pavia Research Unit, Viale Taramelli 16, 27100 Pavia, Italy
E-mail: cristina.tealdi@unipv.it
Fax: +39 0382 987575
Tel: +39 0382 987569

b Department of Chemistry-Physical Chemistry Division, University of Pavia, Viale Taramelli 16, 27100 Pavia, Italy

c Department of Chemistry, University of Bath, Bath, BA2 7AY UK

Abstract

La2−xSrxCoO4±δ, a K2NiF4-type structured oxide, is currently under investigation for its possible application as a cathode material in solid oxide fuel cells operating at intermediate temperature (IT-SOFCs). Here we report a combined energy minimization and molecular dynamics study of oxygen migration mechanisms in the La2−xSrxCoO4±δ material for high Sr levels (x > 0.8). In the oxygen-deficient composition La0.8Sr1.2CoO3.9 the oxide-ion transport mainly occurs through the migration of oxygen vacancies within the perovskite layer of the structure, with possible vacancy paths between adjacent layers. In the oxygen-rich composition La1.2Sr0.8CoO4.1 interstitial oxygen transport is via an interstitialcy mechanism and within the ab plane.

Graphical abstract: Vacancy and interstitial oxide ion migration in heavily doped La2−xSrxCoO4±δ

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Article information

https://doi.org/10.1039/C2JM30769C
Submitted
08 Feb 2012
Accepted
05 Mar 2012
First published
28 Mar 2012
J. Mater. Chem., 2012,22, 8969-8975
Article type
Paper
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Vacancy and interstitial oxide ion migration in heavily doped La2−xSrxCoO4±δ

C. Tealdi, C. Ferrara, P. Mustarelli and M. S. Islam, J. Mater. Chem., 2012, 22, 8969
DOI: 10.1039/C2JM30769C

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