Journal article
A-Site Deficient (Pr0.6Sr0.4)(1-s)Fe0.8Co0.2O3-delta Perovskites as Solid Oxide Fuel Cell Cathodes
Electrochemistry, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark1
Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
Five A-site deficient (Pr0.6Sr0.4)1−sFe0.8Co0.2O3− perovskites (s=0.01, 0.05, 0.10, 0.15, and 0.20) were synthesized using the glycine-nitrate process. The perovskites were characterized with powder X-ray diffraction (XRD), dilatometry, four-point dc conductivity measurements, and electrochemical impedance spectroscopy using cone-shaped electrodes on a Ce0.9Gd0.1O1.95 electrolyte.
XRD revealed that only the compounds with s=0.01 and 0.05 were of single phase. The other compounds contained an additional phase in the form of a Co–Fe spinel. The thermal expansion coefficient decreased systematically with an increase in s. The total conductivity followed the small polaron hopping process below a certain characteristic temperature.
The total conductivity decreased with increasing s. It was likewise shown that the polarization resistance found a minimum for the compound with s=0.05, with a total area specific resistance more than 3 times lower than the weakly A-site deficient (Pr0.6Sr0.4)0.99Fe0.8Co0.2O3− perovskite. ©2009 The Electrochemical Society
| Language: | English |
|---|---|
| Publisher: | The Electrochemical Society |
| Year: | 2009 |
| Pages: | B1257 |
| ISSN: | 19457111 and 00134651 |
| Types: | Journal article |
| DOI: | 10.1149/1.3194786 |
| ORCIDs: | Kammer Hansen, Kent |
