采用柠檬酸-硝酸盐自蔓延燃烧法分别合成了Pr0.6Sr0.4Co0.2Fe0.8O3-δ(PSCF)和Gd0.2Ce0.8O2-δ(GDC)粉体,高温固相法合成La0.9Sr0.1Ga0.8Mg0.2O3-δ(LSGM)电解质粉体.以LSGM为电解质,PSCF同时作为阴极和阳极,GDC作为功能层材料,构建了对称固体氧化物燃料电池PSCF│GDC│LSGM│GDC│PSCF.利用X射线衍射法研究材料的成相以及相互间的化学稳定性,交流阻抗法记录界面极化行为,用扫描电子显微镜观察电池的断面微结构,用自组装的测试系统评价电池输出性能.结果表明,合成的PSCF粉体呈立方钙钛矿结构,具有良好的氧化–还原可逆性.使用GDC功能层明显改善了氢气环境下PSCF与LSGM材料间的化学相容性以及电池的输出性能,800℃时,电极│电解质界面极化电阻从6.892?·cm2下降到0.314?·cm2;以加湿H2(含体积分数3%的水蒸气)为燃料气,空气为氧化气时,单电池输出功率密度由269 mW/cm2增大至463 mW/cm2.研究结果显示,PSCF是对称固体氧化物燃料电池良好的候选电极材料,GDC功能层对改善电池长期稳定性能具有潜在的应用价值.
Pr0.6Sr0.4Co0.2Fe0.8O3-δ(PSCF) and Gd0.2Ce0.8O2-δ(GDC) powders were synthesized by a citric acid- ni-trates self-propagating combustion method, and La0.9Sr0.1Ga0.8Mg0.2O3-δ(LSGM) electrolyte powder was prepared by conventional solid state reaction process. The LSGM-supported symmetrical solid oxide fuel cell of PSCF│GDC│LSGM│GDC│PSCF with GDC function layer was fabricated. The phase structure, chemical compatibility, polarization resistance, cross-section microstructure and the cell performance were investigated by X-ray diffraction (XRD), electrochemical impedance spectra, scanning electron microscope (SEM) and self-assembly SOFC test sys-tem, respectively. The results indicate that PSCF powder exhibits a single perovskite with cubic symmetry and a good redox reversibility. The GDC function layer dramatically improve the chemical compatibility among PSCF, LSGM in hydrogen and the cell performance. The area specific resistance (ASR) of PSCF│GDC decreased from6.892?·cm2 to 0.314?·cm2 in hydrogen at 800℃ and the maximum power density increased from 269 mW/cm2 to 463 mW/cm2 using humidified hydrogen (3%H2O) as fuel and ambient air as oxidant. The results indicate that PSCF is a promising electrode material for symmetrical solid oxide fuel cells, and GDC function layer is a potential way to enhance the long-term stability.
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