丁酸络合浸渍法制备SOFC阳极及其电性能的研究

摘要

利用丁酸络合浸渍法在致密YSZ/多孔YSZ复合体中制备Ni-YSZ阳极.采用SEM、压汞法、阿基米德排水法、XRD、电子天平增重、电化学工作站等测试手段分别对致密YSZ/多孔YSZ复合体的结构、孔径分布和孔隙率、浸渍体的物相、浸渍量及单电池的电性能进行了表征.研究结果表明,致密YSZ/多孔YSZ复合体结合紧密,多孔YSZ孔径分布比较均匀,孔结构规整,孔隙率达52％；致密YSZ/多孔YSZ复合体通过n丁酸／nNi2+=1.5的浸渍液浸渍8次可以得到浸渍增重为40.5wt％的半电池.浸渍的NiO晶粒为20～40nm,提高了阳极的催化活性,有效地增加了阳极反应三相界面的长度,单电池获得了良好的电性能.%Ni-YSZ based anode was prepared by butyric acid impregnation in dense YSZ/porous YSZ complex.The structure,pore distribution and porosity of dense YSZ/porous YSZ complex,phase and content of impregnated anode and electrochemical performance of single cell were characterized by SEM,mercury intrusion method,Archimedes,XRD,electronic balance weighing and electrochemical workstation,respectively.The results show that dense YSZ was compatible with porous YSZ,the pore distribution of porous YSZ was homogeneous,the pore structure was regular and the porosity reached 52％.40.5％ gain in weight of half cell was obtained by impregnation of the dense YSZ/porous YSZ complex for 8 times in butyric acid with the Ni2+ ratio of 1.5.The single cell had excellent electrochemical performance because the resulted Nano-NiO grains of about 20～40nm from impregnation enhanced the catalytic activity of the anode and increased the length of tdple-phase boundaries.