Investigation of scandia stabilized zirconia(ScSZ) - yttria stabilized zirconia(YSZ) composite electrolyte for intermediate temperature fuel cells

The effect of ScSZ - YSZ composite on stabilization and electrical conductivity has been investigated. Composite of (8YSZ)(x)(10ScSZ)((1-x))(x=0 similar to 1) were mixed by wet milling process and sintered at 1400 degrees C for 5h and characterized by XRD, SEM, dilatometry and impedance spectroscopy. the long-term stability of the electrolyte materials was examined at 900 degrees C for up to 1000h. The cubic phase shifts from an YSZ character to a ScSZ character with increase in percentage of ScSZ. The conductivity of composite with increasing ScSZ content is slightly higher than YSZ. Especially, above 50wt% ScSZ composition was exhibited higher electrical conductivity. All compositions showed conductivity degradation after annealing at 900 degrees C for 1000h.