【摘要】 选择具有双钙钛矿结构的Sr₂Fe Nb O₆（SFN）及La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-δ（LSGM）材料混合作为固体氧化物电解池（SOEC）的阴极,在SFN-LSGM中掺杂不同比例的淀粉,经过干压成型并在1400℃下烧结后得到测试样。利用真实密度仪及阿基米德法测定了样品的孔隙率;利用热分析仪测定了不同孔隙率的样品在35¹400℃条件下的热膨胀系数,研究该材料与常用SOEC电解质材料La0.9Sr0.1Ga0.8Mg0.2O3-δ（LSGM）的热匹配性能;之后利用电化学工作站测试了该材料在纯氢气气氛下电导率与孔隙率的关系。结果表明,样品孔隙率与淀粉掺杂量成正比,孔隙率对该材料热膨胀系数影响不大,且该材料与LSGM电解池热匹配性能良好。另外,当样品孔隙率增加时,该材料在850℃纯氢气气氛下的电导率在18%孔隙率时达到最大值。更多还原

【Abstract】 Double perovskite Sr₂FeNbO₆（SFN） powders mixed with La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-δ-δ（LSGM） were selected as cathode materials for solid oxide electrolysis cells. Different contents of starch were added into SFN-LSGM, followed by dry-pressing at 10 MPa and sintering at 1 400 ℃ for 12 h. Porosities of the SFN-LSGM sample were measured by the true-density measuring instrument. Thermal expansion coefficient of the sample between 35 and 1 400 ℃ was measured by the thermal analyser. The electrical conductivity of the sample was measured by the electrochemical work station. All these results demonstrate that the porosity of the sample is related to starch contents, and it matches with LSGM on the themal expansion. With the increase of the porosity, there’s the maximum for the electrical conductivity of the sample at 850 ℃ under pure H₂ atmosphere.更多还原