CHARACTERIZATIONS OF SAMARIA DOPED CERIA ELECTROLYTE FOR SOFC PREPARED WITH FINE POWDER

摘要

We have developed a SOFC with a low operating temperature of 800℃ by using samaria doped ceria (SDC) as an electrolyte. SDC electrolyte has very high ionic conductivity(0.1 S/cm at 800 ℃) as compared with that of yttria stabilized zirconia(YSZ) electrolyte (<0.02 S/cm at 800 ℃). In this work, sintered SDC which has high mechanical strength was obtained by fine powdering process(<0.5 μ m), and the microstructure of this electrolyte was observed by scanning electron microscopy (SEM). The ionic conductivity and the power density of cells were also evaluated.