Electrical and structural properties of Ce_(0.8)(Sm_(0.5-x)Y_(0.5)Al_x)_(0.2)O_(2-δ) ceramics as an electrolyte for SOFC

摘要

The effects of various contents of alumina co-doping on a ceria-based electrolyte were investigated. All samples were sintered at 1500℃ for 10 h. The X-ray diffraction (XRD) patterns showed a fluorite cubic structure. To investigate the surfaces of the Ce_(0.8)(Sm_(0.5-x)Y_(0.5)Al_x)_(0.2)O_(2-δ) (CSYA) ceramics by scanning electron microscopy (SEM), the electrical properties of the CSYA ceramics were measured by AC impedance. The optimal values of ionic conductivity and activation energy were reached at x = 0.4 measured at 600℃. This result indicated that the alumina co-doping improved the electrical and microstructural properties of the ceria-based electrolyte.