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Control of Co content and SOFC cathode performance in Y 1−y Sr 2+y Cu 3−x Co x O 7+δ

Control of Co content and SOFC cathode performance in Y 1−y Sr 2+y Cu 3−x Co x O 7+δ

Authors :
F. Šimo
Michael J. Pitcher
Ming Li
John B. Claridge
Matthew J. Rosseinsky
Christopher Collins
R. Sayers
J.L. Payne
Antoine Demont
Source :
Solid State Sciences. 37:23-32
Publication Year :
2014
Publisher :
Elsevier BV, 2014.

Abstract

The electrochemical performance of the layered perovskite YSr 2 Cu 3− x Co x O 7+ δ , a potential solid oxide fuel cell (SOFC) cathode, is improved by increasing the Co content from x = 1.00 to a maximum of x = 1.30. Single phase samples with x > 1.00 are obtained by tuning the Y/Sr ratio, yielding the composition Y 1− y Sr 2+ y Cu 3− x Co x O 7+ δ (where y ≤ 0.05). The high temperature structure of Y 0.95 Sr 2.05 Cu 1.7 Co 1.3 O 7+ δ at 740 °C is characterised by powder neutron diffraction and the potential of this Co-enriched material as a SOFC cathode is investigated by combining AC impedance spectroscopy, four-probe DC conductivity and powder XRD measurements to determine its electrochemical properties along with its thermal stability and compatibility with a range of commercially available electrolytes. The material is shown to be compatible with doped ceria electrolytes at 900 °C.

Details

ISSN :
12932558
Volume :
37
Database :
OpenAIRE
Journal :
Solid State Sciences
Accession number :
edsair.doi...........3d6507784eab57de8549249b3ceb92db
Full Text :
https://doi.org/10.1016/j.solidstatesciences.2014.07.013