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Ionic Conductivity in Laco1-XMgX03-δ: A Potential Cathode Material for Solid Oxide Fuel Cells

Published online by Cambridge University Press:  15 February 2011

Anbin Yu and
Sossina M. Haile
Anbin Yu
Affiliation:
Department of Materials Science and Engineering, University of Washington, Seattle, WA
Sossina M. Haile
Affiliation:
Department of Materials Science and Engineering, University of Washington, Seattle, WA
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Abstract

A serious concern with present designs of solid oxide fuel cells is the requirement that “triple-point junctions” exist, sites at which the cathode, electrolyte and oxidizing gas are in simultaneous contact. Only at these junctions can the cathode catalyze the reduction of oxygen into 0= ions and initiate their subsequent transport through the electrolyte. Enhanced ionic conductivity in the cathode material may increase the surface area over which reduction can take place and relax the triple-point constraint. To this end, we have examined the electrical and structural properties of LaCo1-xMgx03-δ materials under various atmospheres. Oxygen ion transport in this and related ABO3 perovskites takes place via oxygen vacancy migration. We have opted to investigate the effect of Mg doping on the transition metal site in an effort to maintain a significant oxygen vacancy concentration in oxidizing atmospheres (as would be encountered during fuel cell operation) and to isolate the effects of A- and B-site doping.

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References

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