摘要
本文应用溶胶 凝胶法制备了中温固体氧化物燃料电池电解质材料Ce1 -xGdxO2 -x 2 (CGO) ,研究了凝胶剂用量和焙烧温度对CGO的晶相、粒度及粒度分布、粒子形态结构以及电导率等性能的影响。结果表明该方法合成CGO粉末粒子在 6 0nm左右 ,当凝胶剂用量不小于 2倍摩尔产品量时可以不通过焙烧即可得到较完整的萤石型结构 ,130 0℃以上焙烧时颗粒开始长大。用柠檬酸或甘氨酸作凝胶剂对制备的CGO电导率没有影响。
Super fine particles of Ce 1-x Gd xO 2-x/2 (CGO) electrolyte material for IT-SOFCs were prepared via the sol-gel/combustion technique using glycine or citric acid as the chelating agent. The work mainly focused on the effects of various preparation conditions such as the ratio of chelating agent to the desired product and the sintering temperature on the evolution of crystalline phase, particle size/distribution, morphology, agglomeration and the conductivity of the materials. The results have shown that ultra-fine ceramic powders of around 60nm in diameter may be prepared by the sol-gel/combustion technique combined with dry ball-milling process. The optimum amount of glycine used is not less than two times the amount of desired ceramic products in molar ratio so that the single fluorite crystalline structure may be formed without sintering. The sintering temperatures below 1200℃ have little influence on the particle size/distribution of the prepared CGO powders. Sintering occurs after the temperature is higher than 1200℃ with the result of grow-up of the particle size. The type of chelating agent, glycine or citric acid have no effect on the conductivity of the CGO products.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2004年第4期572-575,共4页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目 (2 0 0 760 2 5)
