Defect Chemistry and Electrical Conductivity of Sm-Doped La1-xSrxCoO3-δ for Solid Oxide Fuel Cells

Mårten Björketun, Ivano Eligio Castelli, Jan Rossmeisl, Thomas Olsen, Kenji Ukai, Michiaki Kato, Gilles Dennler, Karsten Wedel Jacobsen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We have calculated the electrical conductivity of the solid oxide fuel cell (SOFC) cathode contact material La1-xSrxCoO3-δ at 900 K. Experimental trends in conductivity against x, and against δ for fixed x, are correctly reproduced for x ≲ 0.8. Furthermore, we have studied the chemistry of neutral and charged intrinsic and extrinsic defects (dopants) in La0.5Sr0.5CoO3 and have calculated the conductivity of the doped systems. In particular, we find that doping with Sm on the La site should enhance the conductivity, a prediction that is subsequently confirmed by electrical conductivity measurements.
Original languageEnglish
JournalThe Journal of Physical Chemistry Part C
Volume121
Issue number28
Pages (from-to)15017-15027
Number of pages11
ISSN1932-7447
DOIs
Publication statusPublished - 2017

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