Interaction between La(Sr)FeO3 SOFC cathode and YSZ electrolyte

Anode-supported yttria-stabilized zirconia (YSZ) solid oxide fuel cells utilizing a Sr-doped LaFeO3 (LSF) cathode show improved performance with the incorporation of a Sm-doped CeO2 layer between the cathode and YSZ electrolyte. Detailed Xray diffraction (XRD) analysis of LSF-YSZ reaction mixtures i...

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Bibliographic Details
Published in:Solid state ionics 2003-07, Vol.161 (1-2), p.11-18
Main Authors: Simner, S P, Shelton, J P, Anderson, M D, Stevenson, J W
Format: Article
Language:English
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Summary:Anode-supported yttria-stabilized zirconia (YSZ) solid oxide fuel cells utilizing a Sr-doped LaFeO3 (LSF) cathode show improved performance with the incorporation of a Sm-doped CeO2 layer between the cathode and YSZ electrolyte. Detailed Xray diffraction (XRD) analysis of LSF-YSZ reaction mixtures indicates no strontium or lanthanum zirconate formation between these materials even at 1400 deg C. However, a significant shift in the LSF diffraction peaks is readily apparent and corresponds to a unit cell volume expansion. The most likely scenario for the change in volume is considered to be the incorporation of Zr4 + cations in the perovskite structure. The presence of the Zr cations subsequently results in reduced electrical conductivity of the cathode, potentially explaining the need for the aforementioned ceria interlayer.
ISSN:0167-2738
DOI:10.1016/S0167-2738(03)00158-9