Characterization of Novel Perovskite-type La0.6Sr0.2Ca0.2Co1-yFeyO3-δCathode Materials Prepared by Solid State Reaction for IT-SOFCs
Perovskite-type cathode materials La0.6Sr0.2Ca0.2Co1-yFeyO3-δ (0.2≤y≤0.5, marked as LSCCF62282, LSCCF62273, LSCCF62264 and LSCCF62255) for intermediate-temperature solid oxide fuel cells (IT-SOFCs) were prepared by solid state reaction. The establishment process and phase transformation were measured by TG-DTA, FT/IR and XRD techniques. Single hexagonal perovskite phase can be achieved after sintered at 1100 ℃ for 3 h. Mixed conductivity, thermal expansion behavior and chemical stability of sintered samples at 1100 ℃ for 3 h have been investigated. At intermediate temperature (600-800 ℃), the mixed conductivity characterized by DC fourprobe technique is higher than 100 S/cm. LSCCF62282 has the highest conductivity of 297.3 S/cm at 700℃ among the four samples. At lower temperatures, the conductivity follows small polaron hopping mechanism. Thermal expansion coefficients (TECs) of the samples from 50 ℃to 850 ℃ exhibit a reducing tendency with increasing amount of doped Fe3+. Thermal expansion behavior can be improved by doping with Ca2+ and Fe3+ commonly. XRD pattern for LSCCF62282 and YSZ mixture sintered at 800 ℃ for 6h indicates that cathode material LSCCF62282 is chemically stable against YSZ electrolyte at operating temperature.
Solid state reaction Perovskite-type cathode materials Mixed conductivity Thermal expansion behavior Chemical stability
Li chen Zhao jie Kong linglong Ma Yongchang
School of Materials Science & Engineering, Tianjin University of Technology, Tianjin 300384,China School of Materials Science & Engineering, Tianjin University of Technology, Tianjin 300384,China Ti School of Materials Science & Engineering, Tianjin University of Technology, Tianjin 300384,China Ke
国际会议
合肥
英文
1058-1061
2011-09-23（万方平台首次上网日期，不代表论文的发表时间）