制備與表征
(1. 合肥工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院， 合肥 230009;
2. 中國科學(xué)技術(shù)大學(xué) 材料科學(xué)與工程系, 合肥 230026)
摘 要: 采用一種改進(jìn)的均相共沉淀法—緩沖溶液法合成出NiO-Ce0.8Sm0.2O1.9復(fù)合粉體，對其相組成和粒度進(jìn)行了表征。 以NiO-Ce0.8-Sm0.2O1.9復(fù)合粉體為原料制備出固體氧化物燃料電池Ni/SDC陽極材料， 對其微結(jié)構(gòu)和相關(guān)性能進(jìn)行了測試分析，并與由機(jī)械混合NiO-SDC粉體所制備的Ni/SDC材料進(jìn)行了比較。 結(jié)果表明， 通過緩沖溶液法合成的NiO-SDC粉體具有納米級粒度， 以其制備的Ni/SDC陽極材料比由機(jī)械混合粉體所制備Ni/SDC材料的晶粒度和孔隙更為均勻和細(xì)小，電導(dǎo)率也更高， 且以此為陽極的SOFC單電池表現(xiàn)出更優(yōu)異的電池性能。
關(guān)鍵字: 固體氧化物燃料電池； Ni/SDC陽極； NiO-SDC復(fù)合粉體；緩沖溶液法； 微結(jié)構(gòu)
SOFC anodes by buffer-solution method
ZHANG Ben-rui1, MENG Guang-yao2
（ 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
