Anode-supported IT-SOFC anode prepared by tape casting technique

This paper used composite multi-layer tape casting technique successfully in fabricating Ni-YSZ/YSZ anode/ electrolyte composite ceramic of planar intermediate-temperature solid oxide fuel cell (IT-SOFC). The anode was designed as a double-layer structure, which consisted of an anode substrate and an anode functional layer. This design optimized anode microstructure and improved its performances. This design made anode match electrolyte well during the co-sintering process. The anode conductivity was higher than 1000 S·cm^-1 at 800°C. The TEC of the composite ceramic was 12.1×10-6 K^-1 which matched those of interconnector and sealant. When NiO content of functional layer was 50 mass%, the current density was about 80mA·cm^-2 at an overpotential of 0.1V. EIS measurement showed that anodic catalytic activity and interfacial resistances were main factors affecting electrode performance. Unit cells were assembled and tested after above performances were measured.