An Investigation of LSF-YSZ Conductive Scaffolds for Infiltrated SOFC Cathodes
In: F525 ; F529 ; 177 ; 6 ; Departmental Papers (CBE) ; Journal of the Electrochemical Society ; true ; published ; 164, 2017
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report
Zugriff:
Porous compostites of Sr-doped LaFeO3 (LSF and yttria-stabilized zirconia (YSZ) were investigated as conductive scaffolds for infiltrated SOFC cathodes with the goal of producing scaffolds for which only a few perovskite infiltration steps are required to achieve sufficient conductivity. While no new phases form when LSF-YSZ composites are calcined to 1623 K, shifts in the lattice parameters indicate Zr can enter the perovskite phase. Measurements on dense, LSF-YSZ composites show that the level of Zr doping depends on the Sr:La ration. Because conductivity of undoped LSF increases with Sr content while both the iconic and electronic conductivities of Zr-doped LSF decrease with the level of Zr in the perovskite phase, there is an optimum initial Sr content corresponding to La0.9Sr0.1FeO3 (LSF91). Although schaffolds made with 100% LSF had a higher conductivity then scaffolds made with 50:50 LSF-YSZ mixtures, the 50:50 mixture provides the optimal interfacial structure with the electrolyte and sufficient conductivity, providing the best cathode performance upon infiltration of La0.6Sr0.4Co0.2Fe0.8O3 (LSCF).
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An Investigation of LSF-YSZ Conductive Scaffolds for Infiltrated SOFC Cathodes
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Autor/in / Beteiligte Person: | Cheng, Yuan ; Oh, Tae-Sik ; Wilson, Rachel ; Gorte, Raymond J ; Vohs, John M |
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Zeitschrift: | F525 ; F529 ; 177 ; 6 ; Departmental Papers (CBE) ; Journal of the Electrochemical Society ; true ; published ; 164, 2017 |
Veröffentlichung: | 2017 |
Medientyp: | report |
DOI: | 20.500.14332/5826 |
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