A novel electrolyte for intermediate solid oxide fuel cells

✍ Scribed by Jihai Cheng; Weitao Bao; Chengliang Han; Wenbing Cao

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 736 KB
• Volume: 195
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2009.10.017

✦ Synopsis

Scheelite-type, La x Ca 1-x MoO 4+ı 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+ı (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+ı ceramics demonstrate higher sinterability. The La 0.2 Ca 0.8 MoO 4+ı sample that achieved 96.5% of the theoretical density was obtained after being sintered at 1250 • C for 4 h. The conductivity increases with increasing lanthanum content, and a total conductivity of 7.3 × 10 -3 S cm -1 at 800 • C could be obtained in the La 0.2 Ca 0.8 MoO 4+ı compound sintered at 1250 • C for 4 h.