A composite electrolyte for an sofc consisting of a ceria sheet and a zirconia film deosited by the Sol-Gel method

摘要

We investigated a composite electrolyte for solid oxide fuel cells prepared by coating a ceria sheet (Ce_(0.8)Gd_(0.2)O_(2-d) or GDC) with a scandia alumina doped zirconia (0.85ZrO_2-0.110Sc_2O_3-0.04Al_2O_3) film by the sol-gel method. The sol-gel film annealed at 1200 deg C was examined by X-ray diffraction analysis and found to be in a cubic phase at room temperature. The ionic conductivity o f this film is comparable to that of bulk sintered at 1620 deg C. Scanning electron microscope observations reveraled that the film forms a good interface with the electrolyte of the ceria sheet, even though the annealing temperature is as low as 1200 deg C.