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Electrical conductivities and microstructures of LSM, LSM-YSZ and LSM-YSZ/LSM cathodes fabricated on YSZ electrolyte hollow fibres by dip-coating
Materials Today Chemistry ( IF 7.3 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.mtchem.2020.100252
O.O. Agbede , K. Hellgardt , G.H. Kelsall

Abstract Lanthanum strontium manganite – La0.80Sr0.20MnO3 (LSM), LSM-Yttria stabilised zirconia (LSM-YSZ) composite and LSM-YSZ/LSM double-layer cathodes were separately fabricated on Yttria stabilised zirconia (YSZ) electrolyte hollow fibres by dip coating; their electrical conductivities and microstructures were then determined by the direct current four-probe method and scanning electron microscopy (SEM), respectively. Excellent cathode-electrolyte and cathode-cathode adhesion without delamination were achieved by the dip-coating fabrication method. The apparent electrical conductivities of porous LSM, LSM-YSZ and LSM-YSZ/LSM cathodes manufactured on YSZ hollow fibre by dip-coating and sintered at various temperatures in the range 1273–1473 K for 3 h, were 1.8 × 103–5.5 × 103 S/m, 0.32–209 S/m and 1.3 × 103–5.5 × 103 S/m, respectively, at measurement temperatures of 673–1073 K. The operating temperature dependence of the apparent electrical conductivity of the LSM, LSM-YSZ and LSM-YSZ/LSM cathodes was defined by the Arrhenius equation for electrical conductivity. The activation energies for electrical conductivity were derived as 0.106–0.147 eV, 0.83–0.94 eV, and 0.104–0.146 eV for the LSM, LSM-YSZ and LSM-YSZ/LSM cathodes, respectively. The LSM-YSZ and LSM-YSZ/LSM cathodes were strongly influenced by the YSZ and LSM phases, respectively.

中文翻译:

通过浸涂在 YSZ 电解质中空纤维上制备 LSM、LSM-YSZ 和 LSM-YSZ/LSM 阴极的电导率和微观结构

摘要 在氧化钇稳定氧化锆(YSZ)电解质中空纤维上分别通过浸渍法制备了镧锶锰矿-La0.80Sr0.20MnO3(LSM)、LSM-氧化钇稳定氧化锆(LSM-YSZ)复合材料和LSM-YSZ/LSM双层阴极。涂层; 然后分别通过直流四探针法和扫描电子显微镜(SEM)测定它们的电导率和微观结构。通过浸涂制造方法实现了优异的阴极 - 电解质和阴极 - 阴极粘附而不分层。通过浸涂在 YSZ 中空纤维上制造的多孔 LSM、LSM-YSZ 和 LSM-YSZ/LSM 阴极在 1273-1473 K 范围内的不同温度下烧结 3 小时,其表观电导率为 1.8 × 103-5.5 ×分别为 103 S/m、0.32–209 S/m 和 1.3 × 103–5.5 × 103 S/m,在 673–1073 K 的测量温度下。LSM、LSM-YSZ 和 LSM-YSZ/LSM 阴极的表观电导率的工作温度依赖性由电导率的阿伦尼乌斯方程定义。LSM、LSM-YSZ 和 LSM-YSZ/LSM 阴极的导电活化能分别为 0.106-0.147 eV、0.83-0.94 eV 和 0.104-0.146 eV。LSM-YSZ 和 LSM-YSZ/LSM 阴极分别受到 YSZ 和 LSM 相的强烈影响。LSM、LSM-YSZ 和 LSM-YSZ/LSM 阴极分别为 146 eV。LSM-YSZ 和 LSM-YSZ/LSM 阴极分别受到 YSZ 和 LSM 相的强烈影响。LSM、LSM-YSZ 和 LSM-YSZ/LSM 阴极分别为 146 eV。LSM-YSZ 和 LSM-YSZ/LSM 阴极分别受到 YSZ 和 LSM 相的强烈影响。
更新日期:2020-06-01
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