Fabrication of YDC electrolytes via polyol method and investigation of their properties for IT-SOFCs

Ce1 - xYxO2 - x/2 (YDC) powders were successfully prepared using the polyol method. All of the prepared YDC powders were found to have a single-phase fluorite structure after calcination at 500 degrees C. It was also determined that nominal dopant concentrations of YDC samples were very close to the values obtained by EDS. The crystallite sizes varied in the range of 11.54-15.76 nm depending on the dopant concentration, and the lattice parameters of YDC samples were compatible with Vegard's law. YDC pellets with high relative densities were obtained via sintering at 1400 degrees C at 6 h. The ionic conductivities of YDC pellets increased significantly until x = 0.15, and YDC15 exhibited an ionic conductivity of 2.23 x 10(-2) S cm(-1) at 800 degrees C. The ionic conductivity of YDC20 showed a small increase of 12% at the same measurement temperature, reaching 2.5 x 10(-2) S cm(-1).

Automated summary

Ce1 - xYxO2 - x/2 (YDC) powders were successfully prepared via polyol method, and all the prepared YDC powders exhibited a single-phase fluorite structure after calcination at 500 degrees C. The nominal dopant concentrations of YDC samples were in good agreement with the values obtained by EDS. The crystallite sizes varied depending on the dopant concentration, and the lattice parameters of YDC samples followed Vegard's law. YDC pellets with high relative densities were obtained by sintering at 1400 degrees C for 6 hours. The ionic conductivities of YDC pellets significantly increased until x = 0.15, reaching 2.23 x 10(-2) S cm(-1) for YDC15 at 800 degrees C. YDC20 showed a small increase of 12% in ionic conductivity at the same measurement temperature, reaching 2.5 x 10(-2) S cm(-1).