Structure and electrical properties of Y, Fe-based perovskite mixed conducting composites fabricated by a modified polymer precursor method

摘要

Abstract In this work, samples of Y0.07Sr0.93Ti1-xFexO3-δ with 20, 40, 60 and 80?mol% of iron amount were prepared by a low-temperature polymer precursor method. The SEM-EDS analysis proved that analyzed Y0.07Sr0.93Ti1-xFexO3-δ samples were composites of two Ti- and Fe-rich perovskite samples. This kind of composite consists of two phases in which one has a good ionic and the other electronic conductivity, which makes such a composite a potential mixed ionic and electronic conductors (MIECs) material. The total electrical conductivities of analyzed samples were measured in air atmosphere (cathode conditions in Solid Oxide Fuel Cell). The values changed from ～10?3 to 10?1?S?cm?1 and depended on the ratio between two observed perovskite phases. The 0.12?S?cm?1 conductivity value at 800?°C for sample with the highest amount of Fe-rich perovskite in the structure makes this composite material a candidate for air electrode in electrochemical devices. Graphical abstract Display Omitted Highlights ? The samples of Y0.07Sr0.93Ti1-xFexO3-δ with 20-80?mol% of iron were prepared by a low-temperature polymer precursor method. ? The structural properties (XRD, SEM-EDX) of composite samples with a different iron amount in the structure was investigated. ? The electrical properties of the composite materials was studied in in regards to SOFC/SOEC electrode application. ]]>