IT-SOFC复合阳极材料CDC-LSCMCo的制备及性能

采用甘氨酸-硝酸盐法(GNP法)一次性合成固体氧化物燃料电池复合阳极材料Ce0.8Ca0.2O2-La0.7Sr0.3Cr0.5Mn0.5-xCoxO3-δ(CDC-LSCMCo)。XRD、SEM和EDS分析结果表明:1350℃下烧结5h能够得到单一萤石-钙钛矿结构且粒度较小(1μm左右)的复合阳极粉体。电导率的测试研究发现,温度大于750℃时,电导率随Co含量的增加而增大。800℃时,CDC-LSCMCo0.15分别在空气与氢气气氛下的电导率分别为10.5和0.7S·cm-1。SEM和XRD分析表明:CDC-LSCMCo与La0.9Sr0.1Ga0.8Mg0.2O3-δ电解质材料有很好的热与化学相容性,是一种应用前景良好的IT-SOFC阳极材料。

Preparation and Properties of CDC-LSCMCo Composite Anodes for IT-SOFC

IT-SOFC composite anode material Ce_(0.8)Ca_(0.2)O_2-La_(0.7)Sr_(0.3)Cr_(0.5)Mn_(0.5-x)CoxO_(3-δ) (CDC-LSCMCo) was synthesized in one-step by glycine nitrate process (GNP). The results from X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) indicate that the composite anode powder with single fluorite-perovskite phase and small grain size (about 1 μm) was obtained after sintering the predecessor at 1350 ℃ for 5 h. Conductivity testing show that the conductivity of CDC-LSCMCo increases with the Co content increasing when the temperature is above 750 ℃; while at 800 ℃ the conductivity is 10.5 S·cm~(-1) and 0.7 S·cm~(-1) in air and H2 atmosphere, respectively. Good chemical-thermal compatibility between CDC-LSCMCo and La_(0.9)Sr_(0.1)Ga_(0.8)Mg(0.2)O_(3-δ) (LSGM) was confirmed via XRD and SEM. CDC-LSCMCo is a promising anode material of SOFC for its excellent properties at intermediate temperature.