制备与表征
(1. 合肥工业大学 材料科学与工程学院， 合肥 230009;
2. 中国科学技术大学 材料科学与工程系, 合肥 230026)
摘 要: 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。
关键字: 固体氧化物燃料电池； Ni/SDC阳极； NiO-SDC复合粉体；缓冲溶液法； 微结构
SOFC anodes by buffer-solution method
（ 1. School of Materials Science and Engineering,
Hefei University of Technology, Hefei 230009, China;
2. Department of Materials Science and Engineering,
University of Science and Technology of China, Hefei 230026， China）
Abstract: NiO-Ce0.8Sm0.2O1.9 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 Ce0.8Sm0.2O1.9 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.
Key words: solid oxide fuel cells; Ni/SDC anodes; NiO-SDC powder; buffer-solution method; microstructure
