Interaction Between La(Sr)FeO3 SOFC Cathode and YSZ Electrolyte

Journal Article · Tue Jul 01 00:00:00 EDT 2003 · Solid State Ionics

DOI:https://doi.org/10.1016/S0167-2738(03)00158-9· OSTI ID:15005741

Simner, Steve P ^[1]; Shelton, Jayne P ^[2]; Anderson, Michael D ^[1]; Stevenson, Jeffry W ^[1]

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1. BATTELLE (PACIFIC NW LAB)
2. OFFICE OF FELLOWSHIP PROGRAMS

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 X-ray diffraction analysis of LSF-YSZ reaction mixtures indicates no strontium or lanthanum zirconate formation between these materials even at 1400C. 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.

• Research Organization: Pacific Northwest National Lab., Richland, WA (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 15005741
• Report Number(s): PNNL-SA-38452; AA2530000; TRN: US200324%%182
• Journal Information: Solid State Ionics, Vol. 161, Issue 1-2; Other Information: PBD: 1 Jul 2003
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
CATHODES
CATIONS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTROLYTES
LANTHANUM
MIXTURES
PERFORMANCE
PEROVSKITE
SOLID OXIDE FUEL CELLS
STRONTIUM
X-RAY DIFFRACTION
ZIRCONATES
CATHODE: SOFC
YSZ
REACTION