Abstract
LaSr3Fe3-yCoyO10-δ (0 ≤ y ≤ 1.5) oxides with a perovskite-related intergrowth structure have been investigated as cathode materials for oxygen reduction reaction in intermediate temperature solid oxide fuel cells (SOFC). The electrical conductivity, oxygen vacancy concentration, and thermal expansion coefficient (TEC) increase with increasing Co content y. The electrocatalytic activity and power density measured with the LaSr3Fe3-yCoyO10-δ/La0.8Sr0.2Ga0.8Mg0.2O2.8 (LSGM)/Ni−Ce0.9Gd0.1O1.95 (GDC) single cells with a porous Ce0.9Gd0.1O1.95 (GDC) interlayer between the cathode and the electrolyte to avoid undesired interfacial reactions increase with increasing Co content because of an increase in the electronic and oxide ion conductivities of the cathode. The intergrowth LaSr3Fe3-yCoyO10-δ cathodes offer electrochemical performances comparable to that of the well-known pervskite La0.6Sr0.4CoO3-δ cathode but with an important advantage of significantly lower TEC.
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