| Gd1-xSrxCoO3-δ和Gd0.8Sr0.2Co1-yFeyO3-δ系阴极材料的制备和性能 |
| Preparation and Characterization of Gd1-xSrxCoO3-δ and Gd0.8Sr0.2Co1-yFeyO3-δ |
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| 摘要: 采用甘氨酸-硝酸盐(GNP)法合成了新型中温固体氧化物燃料电池(IT-SOFC)的阴极材料Gd1-xSrxCoO3-δ(x=0～0.5)和Gd0.8Sr0.2Co1-yFeyO3-δ(y=0～1)，所合成的初始粉体在800 ℃下煅烧12 h后均形成了钙钛矿结构的单相固溶体。研究发现，Gd0.8Sr0.2CoO3-δ(GSC)的电导率在600 ℃时达到了559 S·cm-1，由Gd0.8Sr0.2CoO2-δ(GDC)电解质和GSC-25GDC材料组成的对称电极在600 ℃和700 ℃的界面阻抗分别为0.170 Ω·cm2和0.064 Ω·cm2，活化能仅为87.8 kJ·mol-1，预示其可以作为ITSOFC较为理想的阴极备选材料；随着Fe3+离子含量的增加，Gd0.8Sr0.2Co1-yFeyO3-δ系列阴极材料的热膨胀系数显著降低，但其电导率也急速下降；此外，通过调整Gd0.8Sr0.2CoO3-δ与GDC的比例可以制备出热膨胀系数与GDC电解质匹配、性能良好的Gd0.8Sr0.2CoO3-δ/GDC复合阴极材料。 |
| 关键词: 甘氨酸-硝酸盐法 固体氧化物燃料电池 阴极材料 电导率 界面阻抗 |
| 基金项目: |
| Abstract: IT-SOFC cathode material of Gd1-xSrxCoO3-δ(x=0～0.5) and Gd0.8Sr0.2Co1-yFeyO3-δ(y=0～1) were synthesized by glycine-nitrate process (GNP) and the stable perovskite phase was formed completely after calcination at 800 ℃ for 12 hours. The results showed that the conductivity of Gd0.8Sr0.2CoO3-δ was 559 S·cm-1 at 600 ℃; the interfacial impedance at 600 ℃ and 700 ℃ of the symmetrical electrode composed of Gd0.8Sr0.2CoO2-δ (GDC) electrolyte and GSC-25GDC composite was 0.170 Ω·cm2 and 0.064 Ω·cm2, and the activation energy was only 87.8 kJ·mol-1, indicating that Gd0.8Sr0.2CoO3-δ could be an ideal IT-SOFC cathode material. With the addition of Fe3+, the thermal expansion and the conductivity of Gd0.8Sr0.2Co1-yFeyO3-δ reduce fast. In addition, Gd0.8Sr0.2CoO3-δ /GDC composite cathode with good performance and matched thermal expansion coefficient to GDC electrolyte can be prepared by adjusting the proportion of Gd0.8Sr0.2CoO3-δ and GDC. |
| Keywords: glycine nitrate process solid oxide fuel cell cathode conductivity thermal expansion |
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| 王亚楠,周和平.Gd1-xSrxCoO3-δ和Gd0.8Sr0.2Co1-yFeyO3-δ系阴极材料的制备和性能[J].无机化学学报,2008,24(10):1558-1563. |
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