Study of LnBaCo2O6-δ (Ln = Pr, Nd, Sm and Gd) double perovskites as new cathode material for IT-SOFC

Oxides with double perovskites structures of general composition LnBaCo2O6-δ (Ln Pr, Nd, Sm and Gd) were synthesized by solid state reaction with the purpose to evaluate new materials to be used as cathodes in intermediate temperature solid oxide fuel cell (IT-SOFC). A preliminary study about electr...

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Bibliographic Details
Published in:Journal of physics. Conference series 2009-05, Vol.167 (1), p.012043
Main Authors: Chavez, E, Mueller, M, Mogni, L, Caneiro, A
Format: Article
Language:English
Subjects:
Cathodes
Differential scanning calorimetry
Electrochemical analysis
Electrode materials
Electrolytic cells
Gadolinium
High temperature
Hysteresis loops
Impedance spectroscopy
Orthorhombic phase
Perovskites
Phase transitions
Physics
Praseodymium
Solid oxide fuel cells
Spectrum analysis
Spray deposition
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Summary:Oxides with double perovskites structures of general composition LnBaCo2O6-δ (Ln Pr, Nd, Sm and Gd) were synthesized by solid state reaction with the purpose to evaluate new materials to be used as cathodes in intermediate temperature solid oxide fuel cell (IT-SOFC). A preliminary study about electrochemical properties was performed by impedance spectroscopy between 500 and 800 °C under atmosphere of pure O2. Symmetrical cells were obtained by spray deposition of LnBaCo2O6-δ (Ln Pr, Nd, Sm and Gd) at both sides of a dense ceramic electrolyte. The impedance spectroscopy measurements as a function of temperatures show a hysteresis loop which could be associated to a tetragonal/orthorhombic phase transition. The existence of this transition was corroborated by high temperature X-Ray diffraction and Differential Scanning Calorimetry measurements.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/167/1/012043