Abstract

This work evaluates the effects of the sintering temperature (800 °C, 900 °C, 1000 °C) of SrTi_1-xFe_xO_3-δ (x = 0.35, 0.5, 0.7) porous electrodes on their electrochemical performance as potential oxygen electrode materials of solid oxide cells. The materials were prepared by a solid-state reaction method and revealed the expected cubic perovskite structure. After milling, the powders were characterised by a sub-micrometre particle size with high sinter-activity. It was shown that the lowest area specific resistance was achieved after sintering SrTi_0.65Fe_0.35O₃ electrodes at 1000 °C, and SrTi_0.5Fe_0.5O₃ and SrTi_0.30Fe_0.70O₃ electrodes at 800 °C, which can be considered to be a relatively low temperature. In general, EIS measurements showed that increasing the Fe content results in lowered electrode polarisation and a decrease of the series resistance. Even though the studied materials have much lower total conductivities than state-of-the-art electrode materials (e.g. (La,Sr)(Co,Fe)O₃), the polarisation resistances obtained in this work can be considered low.

中文翻译：

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烧结温度对固体氧化物电池多孔SrTi 1-x Fe x O3-δ（x = 0.35，0.5，0.7）氧电极电化学性能的影响

摘要

这项工作评估了SrTi _{1- x} Fe _x O _{3- δ}（x  = 0.35，0.5，0.7 ）多孔电极的烧结温度（800°C，900°C，1000°C）对电化学性能的影响固体氧化物电池的氧电极材料。该材料通过固态反应方法制备，并显示出预期的立方钙钛矿结构。研磨后，粉末的特征在于具有高烧结活性的亚微米粒度。结果表明，在1000°C烧结SrTi _0.65 Fe _0.35 O ₃电极和SrTi _0.5 Fe后，可获得最低的面积比电阻。_0.5 O ₃和SrTi _0.30 Fe _0.70 O ₃电极在800°C时，可以认为是相对较低的温度。通常，EIS测量表明，增加Fe含量会降低电极极化并降低串联电阻。即使所研究的材料的总电导率比最新的电极材料（例如（La，Sr）（Co，Fe）O ₃）低得多，但在这项工作中获得的极化电阻仍可以认为是低的。