Hostname: page-component-586b7cd67f-rcrh6 Total loading time: 0 Render date: 2024-11-23T05:13:23.547Z Has data issue: false hasContentIssue false
  • English
  • Français

Oxygen Transport Kinetics in La0.5Sro0.5Fe0.8Ga0.2O3−δ Membranes Under Both Small and Large Oxygen Partial Pressure Gradients

Published online by Cambridge University Press:  10 February 2011

Sangtae Kim ,
Allan J. Jacobson  and
Benjamin Abeles
Sangtae Kim
Affiliation:
Department of Chemistry, University of Houston, Houston, TX 77204-5641
Allan J. Jacobson
Affiliation:
Department of Chemistry, University of Houston, Houston, TX 77204-5641
Benjamin Abeles
Affiliation:
Department of Chemistry, University of Houston, Houston, TX 77204-5641
Get access

Abstract

Oxygen permeation through a new perovskite La0.5Sr0.5Fe0.8Ga0.2O3−δ membrane has been measured both under small (air/He) and large (air/CO, CO2) oxygen partial pressure gradients. In both cases oxygen transport is close to surface limited. By modeling the pressure dependence of the oxygen flow rate under small pressure gradient an ambipolar diffusion coefficient 9.65 × 10−7cm2/s and a surface exchange coefficient 7.15 × 10−6 cm/s at 974 °C were determined. With air/CO, CO2 on the permeate side, the permeability increases linearly with the partial pressure of CO. The observed increase is greater than the maximum enhancement predicted by our model.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 548: Symposia EE – Solid State Ionics V , 1998 , 563
Copyright
Copyright © Materials Research Society 1999

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. Elshof, J.E. ten, Bouwmeester, H.J.M. and Verweij, H., Solid State Ionics, 81, 97, (1995).Google Scholar
2. Ishihara, T., Matsuda, H. and Takita, Y., J. Am. Chem. Soc., 116, 3801 (1994).Google Scholar
3. Huang, P.N. and Petric, A., J. Electrochem. Soc., 143, 1644 (1996).Google Scholar
4. Kim, S., Yang, Y.L., Jacobson, A.J. and Abeles, B., Solid State Ionics, 106, 189 (1998).Google Scholar
5. Kim, S., Yang, Y.L., Jacobson, A.J. and Abeles, B., Solid State Ionics, in press.Google Scholar
6. Elshof, J.E. ten, Bouwmeester, H.J.M. and Verweij, H., Solid State Ionics, 89, 81, (1996).Google Scholar
7. Kim, S., Yang, Y.L., Christoffersen, R. and Jacobson, A.J., Solid State Ionics, 109, 187 (1998).Google Scholar
8. Jacobson, A.J., Kim, S., Medina, A., Yang, Y.L. and Abeles, B., Mat. Res. Soc. Symp. Proc., Boston, in press.Google Scholar
9. Ishigaki, T., Yamauchi, S., Kishio, K., Mizusaki, J. and Fueki, K., J. Solid State Chem., 73, 179 (1988).Google Scholar
10. Outokumpu HSC Chemistry® for Windows, Version 3.0, Outokumpu Research Oy, P.O. Box 60, FIN-28 101 PORI, Finland.Google Scholar