Ionic conductivity in LaCo1-xMgxO3-δ: a potential cathode material for solid oxide fuel cells

Anbin Yu*, Sossina M. Haile

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

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 O= 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-xMgxO3-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.

Original languageEnglish (US)
Pages (from-to)43-48
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume393
StatePublished - Dec 1 1995
EventProceedings of the 1995 MRS Spring Meeting - San Francisco, CA, USA
Duration: Apr 17 1995Apr 21 1995

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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