SOFC复合阳极材料Sr_2Mg_(0.3)Co_(0.7)MoO_6/GDC的制备及性能研究

Preparation and Electrochemical Properties of Sr_2Mg_(0.3)Co_(0.7)MoO_6/GDC Composite Anodes for SOFC

采用柠檬酸燃烧法合成了Sr_2Mg_(0.3)Co_(0.7)MoO_6(SMCO)阳极粉体和Ce_(0.8)Gd_(0.2)O_3(GDC)电解质粉体。制备了不同比例的SMCO-GDC复合阳极,利用X射线衍射仪、扫描电镜和交流阻抗谱研究了GDC含量对复合阳极的物相结构、显微形貌和电性能的影响。研究结果表明,SMCO和GDC在1250℃下具有良好的化学相容性,少量GDC的加入可以提高复合阳极的电化学性能。当SMCO与GDC质量比为4:1时,对称电池极化电阻最小,电池的功率密度最大。GDC含量的增加,不利于电池性能的提高。

Sr_2Mg_（0.3）Co_（0.7）MoO_6（SMCO） anode material and Ce_（0.8）Gd_（0.2）O_3（GDC） electrolyte material were synthesized via citrate acid-complex combustion. SMCO-GDC composite anodes were prepared with different GDC content. X-ray diffraction, scanning electron microscopy and AC impedance spectrum were employed to study the effect of GDC content on the phase structure, microstructure and electrochemical performance, respectively. The results reveal that SMCO has excellent chemical compatibility with GDC at 1250 ℃. The electrochemical performance improved by adding a small amount of GDC. The best anode performance was achieved at the mass ratio of SMCO/GDC = 4 ： 1. The cell performance was decreased with the increase of GDC content.