Synthesis and electrochemical properties of $$ {\text{C}}{{\text{a}}_{{0.9}}}{\text{L}}{{\text{a}}_{{0.1}}}{\text{W}}{{\text{O}}_{{4 + \delta }}} $$ electrolyte for solid oxide fuel cells.
- Resource Type
- Article
- Authors
- Cheng, Jihai; Tian, Changan; Zhao, Difang
- Source
- Journal of Solid State Electrochemistry. Feb2012, Vol. 16 Issue 2, p753-758. 6p.
- Subject
- *COLLOIDS
*AUTOMOBILE ignition
*SCHEELITE
*ELECTRIC potential
- Language
- ISSN
- 1432-8488
$$ {\text{C}}{{\text{a}}_{{0.9}}}{\text{L}}{{\text{a}}_{{0.1}}}{\text{W}}{{\text{O}}_{{4 + \delta }}} $$ powder was prepared by gel auto-ignition process. According to X-ray diffraction analysis, the resulted $$ {\text{C}}{{\text{a}}_{{0.9}}}{\text{L}}{{\text{a}}_{{0.1}}}{\text{W}}{{\text{O}}_{{4 + \delta }}} $$ solid solution has tetragonal scheelite structure. Results of electrochemical testing reveal that the performances of La-doped calcium tungstate are superior to that of pure CaWO, a conductivity of 5.28 × 10 S cm at 800 C could be obtained in the $$ {\text{C}}{{\text{a}}_{{0.9}}}{\text{L}}{{\text{a}}_{{0.1}}}{\text{W}}{{\text{O}}_{{4 + \delta }}} $$ compound sintered at 1,200 C. The electrical conductivity as a function of oxygen partial pressure and also the electromotive force of oxygen concentration cell are measured to prove the mainly ionic conductivity of the investigated material. [ABSTRACT FROM AUTHOR]