Abstract In the present study, a nanocomposite cathode comprising Fe rich La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) based pervoskite semiconductor oxide and Sm-Gd co-doped ceria rich Ce 0.8 Sm 0.1 Gd 0.1 O 1.90 (CSGO) in the ratio of 1:1 has been successfully synthesized by a simple glycine nitrate auto combustion method. The structural properties of the two phase nanocomposite were evaluated by X-ray diffraction and Raman spectroscopy. A detailed electrical properties of co-doped LSCF-CSGO nanocomposites have been studied with a comparison of LSCF added with 10 mol% and 20 mol% Gd singly doped ceria (LSCF-GDC10 and LSCF-GDC20) nanocomposites as a function of temperature in the range of 673–1073 K at air atmosphere by AC impedance spectroscopy. The total electrical conductivity of the co-doped LSCF-CSGO nanocomposites has been found to be 0.043 S cm −1 at 973 K which is higher than that of the LSCF composite containing singly doped compositions. The Sm co-doping in GDC phase has effectively helped to reduce the undesired electronic conduction produced in the doped ceria as the electron concentration of LSCF-CSGO was found to be − 2.62 × 10 15 cm −3 which was lower than the electron concentration of LSCF containing singly doped nanocomposite (LSCF-GDC20, − 2 ×10 16 cm −3 ) estimated by Hall-Effect measurement. The activation energy of LSCF-CSGO nanocomposite has been found to be 0.05 eV for the oxygen reduction reaction by temperature dependent Arrhenius equation. The improved electrical properties in terms of high ionic conductivity and low activation energy have been achieved through the incorporation of Sm into GDC10 electrolyte phase in LSCF nanocomposite. The combustion synthesis method has also effectively helped to produce microstructure containing large grain size (~ 6 µm) which is beneficial for enlarging triple phase boundary (TPB) area of cathodes utilized in solid oxide fuel cells (SOFC) operated at reduced/intermediate temperature (673–973 K).

中文翻译：

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用于中温固体氧化物燃料电池的 La0.6Sr0.4Co0.2 Fe0.8O3-δ – Ce0.8Sm0.1Gd0.1O1.90 纳米复合阴极的自燃合成和电化学研究

摘要 在本研究中，纳米复合阴极包含富 Fe La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) 基钙钛矿半导体氧化物和 Sm-Gd 共掺杂富铈铈 0.8 Sm 0.1 Gd 0.1 O 1.90 (CSGO ) 以 1:1 的比例通过简单的硝酸甘氨酸自燃法成功合成。通过X射线衍射和拉曼光谱评估两相纳米复合材料的结构特性。通过比较添加 10 mol% 和 20 mol% Gd 单掺杂氧化铈（LSCF-GDC10 和 LSCF-GDC20）的 LSCF 纳米复合材料作为温度的函数，研究了共掺杂 LSCF-CSGO 纳米复合材料的详细电学性能。通过交流阻抗谱在空气气氛中的 673–1073 K 范围。已发现共掺杂的 LSCF-CSGO 纳米复合材料的总电导率为 0。043 S cm -1 在 973 K 时高于含有单掺杂组合物的 LSCF 复合材料。由于发现 LSCF-CSGO 的电子浓度为 - 2.62 × 10 15 cm -3，低于通过霍尔效应测量估计的包含单掺杂纳米复合材料 (LSCF-GDC20, − 2 ×10 16 cm -3 ) 的 LSCF。通过温度相关的阿伦尼乌斯方程，已发现 LSCF-CSGO 纳米复合材料的活化能为氧还原反应的 0.05 eV。通过将 Sm 掺入 LSCF 纳米复合材料的 GDC10 电解质相中，已经实现了在高离子电导率和低活化能方面改善的电性能。