GDC interlayers

FIGU RE 1.41 Complex impedance plots of SSC cathodes on SSZ electrolytes with and without GDC interlayer [201]. 

FIGURE 1.42 Current densities (A/cm2) at 700 mV of SOFCs with GDC interlayers sintered at various temperatures [207]. 

FIGURE 1.12 Cross-sectional image of a five-layer cell with the anodic substrate Ni-YSZ, anodic functional layer Ni-ScSZ, electrolyte ScSZ, and interlayer GDC prepared with a tapecasting technique [79]. 

Ceria doped with gadolinia (GDC) or samaria (SDC) is used as the interlayer in some intermediate-temperature SOFCs. Even with the interlayer, however, issues of long-term stability may still remain [39]. If LaGaOs-based oxide is used as the electrolyte, the interface stability problem is less significant. LSC-related cathodes are widely used on LaGa03. For long-term stability, however, the interdiffusion of Co and Ga should be avoided. 

Hence, interlayers comprised of GDC or nanocomposites of perovskites with ScCeSZ allow to provide a high and stable performance of anode-supported SOFC in the IT range. 

---