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Validation of BaIn 0.3 Ti 0.7 O 2.85 as SOFC Electrolyte with Nd 2 NiO 4 , LSM and LSCF as Cathodes
Author(s) -
Letilly M.,
Le Gal La Salle A.,
Caldes M.,
Marrony M.,
Joubert O.
Publication year - 2009
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.200900072
Subject(s) - cathode , electrolyte , materials science , non blocking i/o , compatibility (geochemistry) , electrochemistry , dielectric spectroscopy , thermal stability , ionic conductivity , analytical chemistry (journal) , thermal expansion , solid oxide fuel cell , ionic bonding , chemical engineering , composite material , electrode , ion , chemistry , biochemistry , organic chemistry , chromatography , engineering , catalysis
Due to its high ionic conductivity level, BaIn 0.3 Ti 0.7 O 2.85 (BIT07) is a potential electrolyte material for SOFC. In order to validate the use of this material, its chemical, mechanical and electromechanical compatibilities with three classical cathode materials (La 0.7 Sr 0.3 MnO 3 – δ (LSM), La 0.58 Sr 0.4 Co 0.2 Fe 0.8 O 3 – δ (LSCF) and Nd 2 NiO 4 + δ ) have been tested. The chemical compatibility has been demonstrated by XRD experiments, which show that BIT07 does not react with the cathode materials below 1,000 °C. The mechanical compatibility has been investigated by combining measurements of the thermal expansion coefficients of the cathode materials from X‐ray thermo diffraction and SEM observations. Symmetrical cells cathode/electrolyte/cathode have been studied by electrochemical impedance spectroscopy in order to quantify the quality of the cathode/electrolyte interface and to study the long‐term stability of the cell. The main conclusion of the study is that LSCF presents the best compromise between an acceptable mechanical compatibility and very good electrical properties with BIT07.