固体氧化物燃料电池Ni/SDC阳极材料的制备与表征

Preparation and characterization of Ni/SDC for SOFC anodes by buffer-solution method

采用一种改进的均相共沉淀法—缓冲溶液法合成出NiO Ce0.8Sm0.2O1.9复合粉体,对其相组成和粒度进行了表征。以NiO Ce0.8 Sm0.2O1.9复合粉体为原料制备出固体氧化物燃料电池Ni/SDC阳极材料,对其微结构和相关性能进行了测试分析,并与由机械混合NiO SDC粉体所制备的Ni/SDC材料进行了比较。结果表明,通过缓冲溶液法合成的NiO SDC粉体具有纳米级粒度,以其制备的Ni/SDC阳极材料比由机械混合粉体所制备Ni/SDC材料的晶粒度和孔隙更为均匀和细小,电导率也更高,且以此为阳极的SOFC单电池表现出更优异的电池性能。

NiO-Ce_(0.8)Sm_(0.2)O_(1.9) composite powder was synthesized by an improved coprecipitation method—the buffer solution method and the phase composition and particle size of the composite powder were characterized by X-ray diffraction and transmission electron microscope. Then NiO/SDC ceramic and Ni/SDC cermet were fabricated from NiO-SDC powder by the buffer solution method and by mechanical mixing NiO and Ce_(0.8)Sm_(0.2)O_(1.9) powder, respectively, and their microstructure and related property were also compared. The results show that NiO-SDC powder by the buffer solution method has nanometer particle size with cubic NiO and SDC phase. NiO/SDC ceramic and Ni/SDC cermet fabricated from NiO-SDC powder by the buffer solution method has more homogeneous, finer grain and pore size and higher electrical conductivity than those from the mechanically mixed NiO-SDC powder. SOFC based on Ni/SDC anode prepared from the buffer solution NiO-SDC powder shows higher open circuit voltage and power density. It is contributed to the optimized microstructure and higher conductivity of the Ni/SDC anode.