Details
| Originalsprache | Englisch |
|---|---|
| Titel des Sammelwerks | ECS Transactions |
| Untertitel | Solid Oxide Fuel Cells 11 (SOFC-XI) |
| Seiten | 2527-2536 |
| Seitenumfang | 10 |
| Auflage | 2 PART 3 |
| Publikationsstatus | Veröffentlicht - 2009 |
| Veranstaltung | 11th International Symposium on Solid Oxide Fuel Cells (SOFC-XI)- 216th ECS Meeting - Vienna, Österreich Dauer: 4 Okt. 2009 → 9 Okt. 2009 |
Publikationsreihe
| Name | ECS Transactions |
|---|---|
| Nummer | 2 PART 3 |
| Band | 25 |
| ISSN (Print) | 1938-5862 |
| ISSN (elektronisch) | 1938-6737 |
Abstract
Zinc-doped (BaSr)FeO3-δ perovskite-type membranes were found to exhibit an excellent long-term stability at high and intermediate temperatures under an oxygen partial pressure gradient. With carbon dioxide as sweep gas, the oxygen permeation diminishes almost completely. By X-ray diffraction a phase mixture of hexagonal, tetragonal and cubic perovskite with a (Ba0.4±0.1Sr0.6≁0.1)CO3 layer and some zinc oxide was found. Transmission electron microscopy showed that the dense perovskite membrane is decomposed into phases with different morphologies accompanied by pore and crack formation in a surface layer of 5 μm. After switching to helium as the sweep gas, a hexagonal perovskite phase is still present, which reduces the oxygen permeation flux. A short heating to 950°C regenerates the oxygen permeation flux. The appearance of the carbonate structure leads to a breakdown of the oxygen permeation ability, but the effect of the carbon dioxide is totally reversal after a short high temperature treatment.
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ECS Transactions: Solid Oxide Fuel Cells 11 (SOFC-XI). 2 PART 3. Aufl. 2009. S. 2527-2536 (ECS Transactions; Band 25, Nr. 2 PART 3).
Publikation: Beitrag in Buch/Bericht/Sammelwerk/Konferenzband › Aufsatz in Konferenzband › Forschung › Peer-Review
}
TY - GEN
T1 - Performance of zinc-doped perovskite-type cathodes at intermediate temperatures and under carbon dioxide atmosphere
AU - Martynczuk, J.
AU - Efimov, Konstantin
AU - Robben, Lars
AU - Feldhoff, Armin
PY - 2009
Y1 - 2009
N2 - Zinc-doped (BaSr)FeO3-δ perovskite-type membranes were found to exhibit an excellent long-term stability at high and intermediate temperatures under an oxygen partial pressure gradient. With carbon dioxide as sweep gas, the oxygen permeation diminishes almost completely. By X-ray diffraction a phase mixture of hexagonal, tetragonal and cubic perovskite with a (Ba0.4±0.1Sr0.6≁0.1)CO3 layer and some zinc oxide was found. Transmission electron microscopy showed that the dense perovskite membrane is decomposed into phases with different morphologies accompanied by pore and crack formation in a surface layer of 5 μm. After switching to helium as the sweep gas, a hexagonal perovskite phase is still present, which reduces the oxygen permeation flux. A short heating to 950°C regenerates the oxygen permeation flux. The appearance of the carbonate structure leads to a breakdown of the oxygen permeation ability, but the effect of the carbon dioxide is totally reversal after a short high temperature treatment.
AB - Zinc-doped (BaSr)FeO3-δ perovskite-type membranes were found to exhibit an excellent long-term stability at high and intermediate temperatures under an oxygen partial pressure gradient. With carbon dioxide as sweep gas, the oxygen permeation diminishes almost completely. By X-ray diffraction a phase mixture of hexagonal, tetragonal and cubic perovskite with a (Ba0.4±0.1Sr0.6≁0.1)CO3 layer and some zinc oxide was found. Transmission electron microscopy showed that the dense perovskite membrane is decomposed into phases with different morphologies accompanied by pore and crack formation in a surface layer of 5 μm. After switching to helium as the sweep gas, a hexagonal perovskite phase is still present, which reduces the oxygen permeation flux. A short heating to 950°C regenerates the oxygen permeation flux. The appearance of the carbonate structure leads to a breakdown of the oxygen permeation ability, but the effect of the carbon dioxide is totally reversal after a short high temperature treatment.
UR - http://www.scopus.com/inward/record.url?scp=77649113610&partnerID=8YFLogxK
U2 - 10.1149/1.3205809
DO - 10.1149/1.3205809
M3 - Conference contribution
AN - SCOPUS:77649113610
SN - 9781566777391
T3 - ECS Transactions
SP - 2527
EP - 2536
BT - ECS Transactions
T2 - 11th International Symposium on Solid Oxide Fuel Cells (SOFC-XI)- 216th ECS Meeting
Y2 - 4 October 2009 through 9 October 2009
ER -