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