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A study on the La1 − xSrxMnO3 oxygen cathode

✍ Scribed by J. Van Herle; A.J. McEvoy; K.Ravindranathan Thampi

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
924 KB
Volume
41
Category
Article
ISSN
0013-4686

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✦ Synopsis

The impedance responses and current-overpotential characteristics were studied for oxygen reducing cathodes, stoichiometric La, _,Sr,MnO, (x = 0.16-0.20) in solid oxide fuel cells, under varying conditions of temperature (700-900°C) and oxygen partial pressure (l-10-4atm) for two distinctly different electrode morphologies (porous and dense structure). An electrode densified at the interface with the yttria-stabilized zirconia solid electrolyte was more efficient in this study. The reaction at the finely porous LSM proceeds via the triple phase boundary and ineffectively uses the mixed conductivity property of the material. Reaction mechanisms for both cases (porous and dense structure) are discussed and compared with the literature. A new, two-layered cathode structure is proposed.

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