固体酸化物形燃料電池コンポジット空気極の電極性能と構造の相関評価

抄録

In the present study, La_0.6Sr_0.4CoO₃-Gd_0.1Ce_0.9O_1.95 (LSC-GDC) composite cathodes were fabricated with diffrenet volume fractions. Polarizaion characteristics and microstructure parameters were investigated. Cell overpotential were measured at 700 °C and oxygen partial pressure of 100 %. Current was applied from 0 to 0.2 A/cm⁻² with an interval of 0.05 A/cm⁻². Cathode microstructures of La_0.6Sr_0.4CoO₃-Gd_0.1Ce_0.9O_1.95 = 30:70 and 50:50 vol. % were reconstructed by focus ion beam-scanning electron microscopy technique. A voxel size of 3D reconstructed microstructures is 25 nm. Neither LSC surface area or triple phase boundary density alone can explain the cell performance of the composite cathodes.