摘要
采用溶胶-凝胶法制备了中温固体电解质镓酸镧La0.9Sr0.1Ga0.8Mg0.2O3-δ(LSGM)粉体材料。差式扫描量热重分析(DSC–TGA)以及X-射线粉末衍射(XRD)证实经1 250℃热处理3 h后,LSGM粉体具有单一ABO3钙钛矿结构;能量散射X射线谱(EDX)检测结果表明粉体没有其他杂质元素;扫描电子显微镜法(SEM)和激光散射粒度分布分析表明平均粒径为0.9μm。采用LSGM作为电解质,阳极为Ni/GDC材料,阴极为LSCM/GDC材料,并用离心法成膜工艺组装成SOFC单电池,测量其输出特性和阻抗谱等性能。SEM表明在阳极支撑体上制备的37μm厚的LSGM电解质膜高温烧结后与阳极的接触良好。单电池在800℃的最大功率密度为0.89 W/cm2,电化学测试表明电池开路电压高于1.0 V,说明sol-gel法合成的LSGM可以成功地应用于SOFC的电解质。
La0.9Sr0.1Ga0.8Mg0.2O3-δ（LSGM） powder was prepared by sol-gel method.DSC-TGA and XRD indicate that the pure perovskite phase of LSGM is obtained after calcined in air at a temperature of 1 250 ℃ for 3 h.EDX confirmed the powder has no impurity element.SEM and laser size distribution analysis show that the average size of the powder is 0.9 μm.The current-voltage curve and electrochemical impedance spectra（EIS） for the single SOFC with Ni/GDC（Ce0.9Gd0.1O1.95） anode,LSCM/GDC cathode and LSGM electrolyte was examined.SEM suggest that the LSGM film of about 37 μm thick is well adhered to the anode.The cell produced a maximum power density of 0.89 W/cm2 at 800 ℃ and the open circuit voltage of the cells were all above 1.0 V.The cell performance indicates that LSGM synthesized by the sol-gel method can be applied to the electrolyte of SOFC.
出处
《电源技术》
CAS
CSCD
北大核心
2012年第11期1623-1625,1650,共4页
Chinese Journal of Power Sources
基金
国家自然科学基金(31100441)
教育部科学技术研究重点项目(210163)
广西自然科学基金(2010GXNSFA013045)
