A novel electrolyte for intermediate solid oxide fuel cells

作者：Cheng Jihai; Bao Weitao; Han Chengliang; Cao Wenbing

来源：Journal of Power Sources, 2010, 195(7): 1849-1853.

DOI：10.1016/j.jpowsour.2009.10.017

• Solid oxide fuel cells
• Electrolyte
• Scheelite
• Sinterability
• Electrochemical property

Scheelite-type, La(x)Ca(1-x)MoO(4+delta) electrolyte powders, are prepared by the sol-gel process. The crystal structure of the samples is determined by employing the technique of X-ray diffraction (XRD). According to XRD analysis, the continuous series of La(x)Ca(1-x)MoO(4+delta) (0 <= x <= 0.3) solid solutions have the structure of tetragonal scheelite. Their lattice parameters are greater than that of the original sample, and increase with increasing values of x in the La-substituted system. Results of sinterability and electrochemical testing reveal that the performances of La-doped calcium molybdate are superior to that of pure CaMoO(4). La(x)Ca(1-x)MoO(4+delta) ceramics' demonstrate higher sinterability. The La(0.2)Ca(0.8)MoO(4+delta) sample that achieved 96.5% of the theoretical density was obtained after being sintered at 1250 degrees C for 4h. The conductivity increases with increasing lanthanum content, and a total conductivity of 7.3 x 10(-3) Scm(-1) at 800 degrees C could be obtained in the La(0.2)Ca(0.8)MoO(4+delta) compound sintered at 1250 degrees C for 4 h.

• 出版日期2010-4-2
• 单位合肥学院