材料科学
阴极
四方晶系
兴奋剂
钙钛矿(结构)
氧化物
分析化学(期刊)
电导率
固体氧化物燃料电池
极化(电化学)
电化学
上部结构
电阻率和电导率
阳极
相(物质)
结晶学
电极
化学
光电子学
冶金
物理化学
电气工程
海洋学
有机化学
色谱法
地质学
工程类
作者
Xiangming Bao,Xiaogang Su,Shibo Wang,Bin Pan,Li Wang,Leilei Zhang,Zhaoyuan Song,Wen Long,Cunlei Li
标识
DOI:10.1016/j.jallcom.2023.171391
摘要
Layered perovskite oxides, Y1–xBixBaCo2O5+δ (YBBCx, x = 0.0–0.2) were investigated as cathodes for intermediate-temperature solid oxide fuel cells (IT-SOFCs). XRD results indicate the YBBCx could be indexed to a tetragonal phase with trace of 3 × 3 × 1 superstructure configuration. No significant change in thermal expansion coefficients (TECs) was detected with the Bi-doping, and the TECs were 15.7–16.8 × 10−6 K−1 at 100–935 °C in air. Although the Bi-doping results in a decrease in conductivity of the YBBCx, the x = 0.2 sample still shows higher conductivity than that of a standard SOFC cathode (∼100 S cm−1). Additionally, the Bi-doping leads to an enhancement in the electrochemical performance mainly due to improved ion and electron charge transfers. Among the YBBCx compositions, the YBBC0.2 cathode shows the lowest polarization resistance (Rp) of 0.034 Ω cm2 at 700 °C. For a single cell with 300 µm thick La0.9Sr0.1Ga0.8Mg0.2O3–δ (LSGM) and YBBC0.2 cathode, a peak power density (Pmax) of 537 mW cm−2 at 700 °C was achieved with no significant deterioration in performance after a 100–h testing.
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