Synthesis and properties of La0.7Sr0.3Fe0.7Co0.2Ni0.1O3-δ cathode material for solid oxides fuel cell
LI Xiang-guo1, LI Song-bo1, AN Sheng-li2, ZHANG Fan1
1. School of Chemistry and Chemical Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, China; 2. School of Material and Metallurgy, Inner Mongolia University of Science & Technology, Baotou 014010, China
Abstract: La0.7Sr0.3Fe0.7Co0.2Ni0.1O3-δ(LSFCN),a cathode material for medium and low temperature solid oxides fuel cell,is prepared by sol-gel method and solid state reaction method,respectively.The structure and properties of the material are measured by thermogravimetry-differential thermal analysis (TG-DTA),X-ray diffractometry (XRD),scanning electron microscopy (SEM),four-probe DC method,thermal expansion coefficient (TEC) and alternating-current impedance.It is shown that LSFCN prepared by two methods both have a single perovskite structure and do not react with the electrolyte SDC during 950℃ calcination,meaning a good stability.LSFCN prepared by sol-gel method has a smaller particle size,a more regular shape and a higher crystallinity.Both LSFCN by two methods exhibit a conductivity mechanism of small polaron at the test temperature of 400-800℃,their conductivities increase with the increase of the test temperature.The conductivity of LSFCN prepared by sol-gel method is higher than that of LSFCN prepared by the solid state reaction method.The maximum conductivity of LSFCN reaches 619.4 S·cm-1 at 800℃.LSFCN cathode samples prepared by the two methods have a good match with SDC electrolyte,and both are favorable for oxygen transfer through three-phase interface,which can improve the electro chemical properties of the materials.
李向国, 李松波, 安胜利, 张帆. SOFC阴极材料La0.7Sr0.3Fe0.7Co0.2Ni0.1O3-δ的制备与性能[J]. 现代化工, 2019, 39(10): 92-96.
LI Xiang-guo, LI Song-bo, AN Sheng-li, ZHANG Fan. Synthesis and properties of La0.7Sr0.3Fe0.7Co0.2Ni0.1O3-δ cathode material for solid oxides fuel cell. Modern Chemical Industry, 2019, 39(10): 92-96.
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