材料科学
电解质
烧结
介电谱
电极
离子电导率
电导率
极化(电化学)
电化学
陶瓷
化学工程
扫描电子显微镜
质子导体
分析化学(期刊)
复合材料
化学
工程类
物理化学
色谱法
作者
Kashif Khan,Zaheer Ud Din Babar,Sana Qayyum,Muhammad Bilal Hanif,Sajid Rauf,Amir Sultan,Michał Mosiałek,Martin Motola,Bin Lin
标识
DOI:10.1016/j.ceramint.2023.02.043
摘要
BaCe0.5Zr0.3Y0.2O3–δ (BCZY), regarded as one of the most promising proton–conducting electrolytes, often experiences difficulty because of its high sintering temperature. Here, a B–site doped BaCe0.56Zr0.2Ni0.04Y0.2O3–δ (BCZNY) electrolytes were fabricated to address this drawback. The impact of Ni addition on sintering and electrical properties was examined. By adding Ni to the B–site of BCZY, a substantial decrease in the sintering temperature was achieved, i.e., from 1600 °C (for BCZY) to 1300 °C (for BCZNY). A conductivity of 0.05 S cm−1 at 700 °C was observed for BCZNY electrolyte in a moist nitrogen environment. In addition, SrFe0.8Mo0.2O3–δ (SFM) is utilized as a symmetrical electrode material due to its high ionic and electronic conductivity. SFM electrode was synthesized via combustion process and exhibited suitable chemical and thermal compatibility with BCZY and BCZNY electrolytes up to 1100 °C. A single–phase cubic structure along with the surface morphology of electrolyte–supported symmetrical cells was confirmed by X–ray diffraction and scanning electron microscopy. Electrochemical impedance spectroscopy was conducted to identify the area–specific polarization resistance (ASR). The lowest ASR values of 0.037, 0.081, and 0.327 Ω cm2 at 800, 700, and 600 °C in humidified hydrogen were obtained in SFM-BCZNY composite electrode. The symmetrical cell achieved a peak power density of 254 m W cm−2 (cell configuration; SFM-BCZNY | BCZNY | SFM-BCZNY) at 800 °C. The fuel cell devices showed long–term stability of the fuel cell device for 100 h at 700 °C under a current of 120 mA cm−2. Considering the presented results, the as-prepared BCZNY is a promising protonic electrolyte for IT-SOFCs.
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