STUDY OF La9.67Si6-zAlzO26.5-z/2 MATERIALS FOR THE ELECTROLYTE OF INTERMEDIATE TEMPERATURE SOFCs
Apatite silicates have recently been reported as promising electrolyte materials for intermediate temperature Solid Oxide Fuel Cells (IT-SOFCs) in many researches. In this paper, the electrolyte materials with compostion of La9.67Si6-xAlxO26.5-x/2(x=0, 0.25, 0.5, 0.75, 1) were prepared by sol-gel process. The apatite phase can be obtained at 800-900℃ according to the X-ray diffraction results. In the La9.67Si6-xAlxO26.5-x/2 solid solution system, the crystal structure, thermal expansion coefficient and relative density as functions of Al doped content were investigated. It was found that La9.67Si5AlO26 exhibited the best chemical and physical properties as an electrolyte material. Relative density of the sample sintered at 1500 for 4h can reach 93%, which is necessary for a practical electrolyte in ℃ SOFC operations. Its electrical conductivity measured by a conventional four-probe method in air was 2.12×10-3S·cm-1 at 700 ℃, and the TEC of it in the temperature range from 30 to 800 ℃ ℃ was 7.8×10-6 K-1.The electrode materials compatible for the apatite silicates electrolyte will be discussed latter.
J. Zhou S.R.Wang T.L.Wen
CAS Key Laboratory of Materials for Energy Conversion ，Shanghai Institute of Ceramics, Chinese Acade CAS Key Laboratory of Materials for Energy Conversion ，Shanghai Institute of Ceramics, Chinese Acad
国际会议
The 12th Asian Conference on Solid State Ionics(第十二届亚洲固态离子学会议暨第十五届中国固态离子学会议)
武汉
英文
177-182
2010-05-02（万方平台首次上网日期，不代表论文的发表时间）