Abstract

The aim of this study is to prepare Er and Sm co-doped CeO₂ electrolytes via the Pechini method and investigate the effects of simultaneous addition of Sm and Er on the structural and electrical features of CeO₂. The structural, functional group analysis, microstructures, and electrical properties of the electrolyte samples are conducted by X–ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and impedance spectroscopy (IS). All the calcined and sintered electrolytes were obtained with cubic fluorite crystal structure without secondary oxide phases. After sintering at 1400 °C, highly dense electrolytes were achieved (> 90%). The IS measurements indicated that the highest ionic conductivity was observed for the singly doped Ce_0.80Sm_0.20O_1.90 (σ_750 °C = 3.86 x 10⁻² S/cm) electrolyte. σ_750°C was found to be 3.82 x 10⁻², 1.73 x 10⁻², 0.61 x 10⁻² S/cm for Ce_0.80Er_0.05Sm_0.15O_1.90, Ce_0.80Er_0.10Sm_0.10O_1.90 and Ce_0.90Er_0.10O_1.95, respectively.

摘要

本研究的目的是通过 Pechini 方法制备 Er 和 Sm 共掺杂的 CeO ₂电解质，并研究同时添加 Sm 和 Er 对 CeO ₂结构和电学特性的影响。电解质样品的结构、官能团分析、微观结构和电性能通过 X 射线衍射、傅里叶变换红外光谱、扫描电子显微镜和阻抗谱 (IS) 进行。所有煅烧和烧结电解质均具有立方萤石晶体结构，无二次氧化物相。在 1400 °C 下烧结后，获得了高密度电解质（> 90%）。IS 测量表明，对于单掺杂 Ce _0.80观察到最高的离子电导率Sm _0.20 O _1.90 (σ _{750 °C} = 3.86 x 10 ^-2 S/cm) 电解质。σ _750℃被发现是3.82×10 ^-2，1.73×10 ^-2，0.61×10 ^-2 S / cm的对策_0.80铒_0.05钐_0.15 ø _1.90，CE _0.80铒_0.10钐_0.10 ö _1.90和Ce _0.90铒分别为_0.10 O _1.95。