Journal article
Structural properties and electrochemical performance of strontium- and nickel-substituted lanthanum cobaltite
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
Electroceramics, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark4
This study presents structural and defect properties as function of doping, temperature and pO2 in (La1−x Srx)0.99 Co0.6+xNi0.4−xO3−δ (x=0; 0.1; 0.2; 0.3; 0.4). Thermograviomertric analysis showed a linear increase in δ with both T and x in the high temperature regime. The onset temperature of reduction was seen to increase with x which was confirmed with dilatometry and XANES.
XANES measurements further indicated that reduction was exclusively associated with cobalt. A transition from polaronic to itinerant electronic conduction was measured with increasing x ranging from 2000–3500 Scm−1 in the intermediate SOFC temperature range of 500–800 °C. The polarisation resistance when used as porous SOFC cathodes was measured to decrease with x.
The activation energy of about 1.8 eV for all electrodes but (La0.6 Sr0.4)0.99 CoO3−δ, for which it was about 1 eV.
| Language: | English |
|---|---|
| Year: | 2008 |
| Pages: | 636-646 |
| ISSN: | 18727689 and 01672738 |
| Types: | Journal article |
| DOI: | 10.1016/j.ssi.2008.04.026 |
| ORCIDs: | Hagen, Anke and Mogensen, Mogens Bjerg |
