Hostname: page-component-586b7cd67f-dsjbd Total loading time: 0 Render date: 2024-11-25T15:41:02.871Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 393: Symposium W – Materials for Electrochemical Energy Storage and Conversion , 1995 , 43
Copyright
Copyright © Materials Research Society 1995

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1 Minh, N. Q., J. Am. Ceram. Soc. 76, 563 (1993).Google Scholar
2 Hirschenhofer, J. H., Stauffer, D. B. and Engleman, R. R., Fuel Cells --A Handbook revision 3 (U.S. Department of Energy, Morgantown, WV, 1994), p. 1–8.Google Scholar
3 Teraoka, Y., Zhang, H. M., Okamoto, K. and Yamazoe, N., Mat. Res. Bull. 23, 51 (1988).Google Scholar
4 Teraoka, Y., Nobumaba, T., Okamoto, K., Miura, N. and Yamazoe, N., Solid State Ionics 48, 207(1991).Google Scholar
5 Teraoka, Y., Nobumaga, T. and Yamazoe, N., Chem. Lett. 503 (1988).Google Scholar
6 Yamazoe, N. and Seiyama, T., Chem. Lett. 893 (1984).Google Scholar
7 Matsuura, T., Ishigaki, T. and Mizusaki, J., Japan. J. App. Phy. 23, 1172 (1984).Google Scholar
8 Carter, S., Selcuk, A., Chater, R. J., Kajda, J., Kilner, J. A. and Steele, B. C. H., Solid State Ionics 53–54, 597 (1992).Google Scholar
9 Ishigaki, T., Yamauchi, S., Mizusaki, J. and Fueki, K., J. Sol. State Chem. 54, 100 (1984).Google Scholar
10 Ishigaki, T., Yamauchi, S., Kishio, K., Mizusake, J. and Fueki, K., J. Sol. State Chem. 73, 179 (1988).Google Scholar
11 Thornton, G., Tofield, B. D. and Hewat, A. W., J. Sol. State Chem. 61, 301 (1986) and references therein.Google Scholar
12 Iwahara, H., Esaka, T. and Miyawaki, Y., Solid State Ionics 44, 257 (1991).Google Scholar