In a systematic study, two compositional series of ceria-based oxides, both co-doped with Sm and Gd, were synthesised using a low temperature method and evaluated as oxygen ion-conducting electrolytes for Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFCs). Series one, Ce_1-2xSm_xGd_xO_2-x, had equal concentrations of Sm and Gd but varying total dopant concentration. Series two, Ce_0.825Sm_xGd_0.175-xO_1.9125, had a fixed total dopant concentration but the Sm:Gd concentration ratio was varied. The materials were characterised using scanning and transmission electron microscopy, inductively coupled plasma mass spectrometry and X-ray diffraction. Impedance spectra were recorded on dense pellets of these materials. From these, total, bulk and grain boundary conductivities and capacitances along with activation energies, pre-exponential constants and enthalpies of ion migration and defect association were obtained. These gave a detailed insight into the fundamental conduction processes in the materials. Ce_0.825Sm_0.0875Gd_0.0875O_1.9125 had the highest total ionic conductivity at temperatures of 550 °C and above and also demonstrated an enhanced conductivity with respect to its singly-doped parent compounds, Ce_0.825Sm_0.175O_1.9125 and Ce_0.825Gd_0.175O_1.9125, at 400 °C and above. This compares favourably with previously-reported values and has promising implications for the development of IT-SOFCs.

在一项系统研究中，使用低温方法合成了两个均掺杂有Sm和Gd的二氧化铈基氧化物系列，并将其用作中温固体氧化物燃料电池（IT-SOFC）的氧离子传导电解质。系列一，Ce _{1- 2 x} Sm _x Gd _x O _{2- x}，具有相等的Sm和Gd浓度，但总掺杂浓度不同。系列二，Ce _0.825 Sm _x Gd _0.175-x O _1.9125，具有固定的总掺杂剂浓度，但Sm：Gd浓度比变化。使用扫描和透射电子显微镜，感应耦合等离子体质谱和X射线衍射对材料进行表征。在这些材料的致密颗粒上记录了阻抗谱。由此，获得了总，整体和晶界的电导率和电容，以及活化能，指数前常数和离子迁移焓与缺陷缔合的焓。这些详细介绍了材料中的基本传导过程。铈_0.825 Sm _0.0875 Gd _0.0875 O _1.9125在550°C及以上的温度下具有最高的总离子电导率，并且在400°C及以上温度下，其单掺杂母体Ce _0.825 Sm _0.175 O _1.9125和Ce _0.825 Gd _0.175 O _{1.9125的电导率也有所提高}。与以前报告的值相比，它具有优势，并且对IT-SOFC的开发具有可喜的意义。