Fabrication and characterization of a dual layer ceramic interconnect on a porous NiO-YSZ anode support

An La0.8Sr0.2MnO3 (LSM)/Sr0.88Y0.08TiO3 (SYT) dual layer interconnect was coated on an NiO-YSZ porous support via screen printing and co-firing processes. SYT and LSM single phase powders were synthesized by solid state reaction and Pechini method, respectively. The thickness of the dual layer was approximately 200 μm. The LSM/SYT dual layer showed a good gas-tightness and had a uniform microstructure without cracks, delamination or warpage. No atomic inter-diffusion between the dual layer and the NiO-YSZ support was detected, suggesting that SYT is phase compatible with NiO-YSZ. The area specific resistance (ASR) of the LSM/SYT/Ni-YSZ sample was 0.19 Ω cm2 at 800 °C under oxidizing/reducing atmospheres; this value was lower than that of the SYT/Ni-YSZ sample.