Ionic conductivity in LaCo{sub 1{minus}x}Mg{sub x}O{sub 3{minus}{delta}}: A potential cathode material for solid oxide fuel cells
- Univ. of Washington, Seattle, WA (United States). Dept. of Materials Science and Engineering
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{sup {minus}2} 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, the authors have examined the electrical and structural properties of LaCo{sub 1{minus}x}Mg{sub x}O{sub 3{minus}{delta}} materials under various atmospheres. Oxygen ion transport in this and related ABO{sub 3} perovskites takes place via oxygen vacancy migration. They 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.
- OSTI ID:
- 162903
- Report Number(s):
- CONF-950412-; ISBN 1-55899-296-0; TRN: IM9604%%7
- Resource Relation:
- Conference: Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 17-21 Apr 1995; Other Information: PBD: 1995; Related Information: Is Part Of Materials for electrochemical energy storage and conversion -- Batteries, capacitors and fuel cells; Doughty, D.H. [ed.] [Sandia National Labs., Albuquerque, NM (United States)]; Vyas, B. [ed.] [AT and T Bell Labs., Murray Hill, NJ (United States)]; Takamura, Tsutomu [ed.] [Rikkyo Univ., Tokyo (Japan)]; Huff, J.R. [ed.] [Ballard Power Corp., Albuquerque, NM (United States)]; PB: 463 p.; Materials Research Society symposium proceedings, Volume 393
- Country of Publication:
- United States
- Language:
- English
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