Preparation of La-doped ceria as an anode interlayer for SOFC

An important question of LSGM-based SOFC was formation of resistive phases at anode/electrolyte interface as a result of solid-state reactions. The key issue was preparation of a thin and dense La-doped ceria La_0.6Ce_0.7O_2-δ (LDC30) as an interlayer between anode and electrolyte. In this paper the LDC30 precursors was prepared by co-precipitation method. After calcined it was found that only the fine pure phased LDC30 powder was formed due to adulteration into CeO₂ crystal lattice successfully by X-ray diffractometer (XRD) and particles distribution testing, and the optimum parameters were obtained sintering at 1000°C with 2 h holding time. The LDC30 slurry were coated on LSGM electrolyte by screen-printing, and then sintered at different temperature. The influences of sintering temperature on the microstructure and performance of LDC films were investigated using SEM and thermal expansive analysis; The results of investigation show that optimum parameters were obtained firing at 1400°C with 2 h holding time and a dense interlayer of 10 μm thickness was obtained under this condition, and the power density of cells with interlayer was increased by 44% compared with that without interlayer.