稀土离子共掺杂双钙钛矿阴极材料的性能研究
首发时间:2019-06-28
摘要:通过溶胶凝胶法制备出了均匀的LaxPr1-xBaCuFeO5+δ(0≤x≤1)粉体,在1000 ºC 10小时烧结后得到了我们所需的正交钙钛矿结构。XRD结果表明,SDC与LaxPr1-xBaCuFeO5+δ在950 ºC具有良好的化学兼容性,可作为该材料的电解质使用。TEC测试结果显示,LaBaCuFeO5+δ(LBCF), La0.5Pr0.5BaCuFeO5+δ(LPBCF)和PrBaCuFeO5+δ(PBCF)的平均热膨胀系数在30–850 ºC分别为16.7×10-6 K-1,15.5×10-6 K-1和14.0×10-6 K-1。采用四端法测试了LBCF,LPBCF和PBCF在高温下的电导率,所有样品随着温度的升高都经历了由半导体向金属相的转变,电导率最大值分别为80 S cm-1, 89 S cm-1和46 S cm-1。以SDC为电解质的半电池电化学阻抗谱测试结果表明,LBCF,LPBCF和PBCF在750 ºC时极化电阻分别为0.09 Ω cm2, 0.07 Ω cm2和0.12 Ω cm2。以上结果证实无Co的LBCF,LPBCF和PBCF钙钛矿材料非常有潜力作为IT–SOFC的阴极材料而被应用。
关键词: 固体氧化物燃料电池 阴极材料 电导率 热膨胀 电化学性能
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Performance of rare earth ion co-doped double perovskite cathode materials
Abstract:The LaxPr1-xBaCuFeO5+δ (0≤x≤1) powders were prepared by sol-gel method. XRD results show that SDC has good chemical compatibility with LaxPr1-xBaCuFeO5+δ at 950 ºC. The average thermal expansion coefficient (TEC) of LaBaCuFeO5+δ (LBCF), La0.5Pr0.5BaCuFeO5+δ (LPBCF) and PrBaCuFeO5+δ (PBCF) are 16.7×10-6 K-1, 15.5×10-6 K-1 and 14.0×10-6 K-1 30–850 ºC, respectively. The conductivity of LBCF, LPBCF and PBCF at high temperature was tested by the four-terminal method. All samples underwent the transition from semiconductor to metal phase with the increase of temperature, and the maximum conductivity are 80 S cm-1,89 S cm-1 and 46 S cm-1, respectively.The electrochemical impedance spectrum test results show that LBCF, LPBCF and PBCF polarization resistance are 0.09 Ω cm2, 0.07 Ω cm2 and 0.12 Ω cm2 at 750 ºC, respectively.These results confirm that Co-free LBCF, LPBCF and PBCF perovskite materials have great potential to be used as IT-SOFC cathode materials.
Keywords: Solid oxide fuel cell cathode material conductivity thermal expansion Electrochemical performance
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