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Evaluation of the La0.75Sr0.25Mn0.8Co0.2O3−δ system as cathode material for ITSOFCs with La9Sr1Si6O26.5 apatite as electrolyte

✍ Scribed by Claire Bonhomme; Sophie Beaudet-Savignat; Thierry Chartier; Pierre-Marie Geffroy; Anne-Laure Sauvet

Publisher: Elsevier Science
Year: 2009
Tongue: English
Weight: 703 KB
Volume: 29
Category: Article
ISSN: 0955-2219
DOI: 10.1016/j.jeurceramsoc.2008.11.009

No coin nor oath required. For personal study only.

✦ Synopsis

In the past years, a major interest has been devoted to decrease the working temperature of solid oxide fuel cells (SOFCs) down to about 700 • C.

Apatite materials (La 10-x Sr x Si 6 O 27-x/2 ) are attractive candidates for solid electrolytes, with a high ionic conductivity at 700 • C, a chemical and a dimensional stability for a pO 2 ranging from 10 -25 to 0.2 atm. A perovskite oxide (La 0.75 Sr 0.25 Mn 0.8 Co 0.2 O 3-δ ) has been used as a cathode material.

Symmetrical cathode/electrolyte/cathode cells were fabricated by stacking layers obtained by tape casting of apatite and perovskite powders and co-sintering at 1400 • C for 2 h in air.

Impedance spectroscopy measurements were performed on these cells in order to determine the electrode resistance. It has been shown that the latter decreases with the porosity content of the cathode and with the use of a composite material (apatite/perovskite) instead of a simple perovskite.

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