甘氨酸法制备YSZ粉体及其在中温固体氧化物燃料电池中的应用  

Preparation of yttria stabilized zirconia powders with a glycine-nitrate process for intermediate-temperature solid oxide fuel cells

作　　者：王其艮[1] 彭冉冉[1] 夏长荣[1] 

机构地区：[1]中国科学技术大学材料科学与工程系可再生清洁能源实验室,安徽合肥230026

出　　处：《中国科学技术大学学报》2008年第6期633-638,共6页JUSTC

基　　金：国家自然科学基金(50332040);和教育部高等院校博士学科点专项科研基金(SRFDP20050358023)资助

摘　　要：用甘氨酸法制备了堆积密度小于0．35％的疏松（Y2O3）0.08（ZrO2）0.02（YSZ）陶瓷粉体．研究了预烧温度对初级粉体的晶体结构、晶粒大小、比表面积、粉体形貌和烧结性能的影响，进一步研究预烧温度对YSZ烧结体电导率的影响．随着预烧温度的升高，粉体的晶粒尺寸增加，比表面积减小，烧结体的相对密度减小，粉体的多孔疏松程度降低．700℃预烧粉体的生坯最易致密化，得到的YSZ烧结样品具有最高电导率，其值在800℃时为0．029S·cm^-1．同时以700℃预烧的粉体为原材料，用共压共烧工艺，制备阳极支撑的厚度为10-20μm的YSZ电解质薄膜．以YSZ薄膜为基础的单电池在700℃下的最大功率密度达到470mW／cm^2．Highly porous （Y2O3 ） 0. 08 （ZrO2） 0.92 （YSZ） powders were synthesized with a glycine-nitrate process for the fabrication of dense YSZ films as electrolytes of intermediate temperature solid oxide fuel ceils （SOFCs）. The effect of pre-heating temperature of green powders was investigated regarding the phase structure, crystallite size, specific surface area, sintering behavior, electrical conductivity and microstructure of derived YSZ. With the increase of pre-heating temperature, the crystalline size increased, the specific surface area and the density of the sintered YSZ pellets decreased while the powder became less porous. YSZ powder pre-heated at 700 ℃ showed the highest sinterability and the corresponding pellet had the highest conductivity, 0. 029 S · cm^-1 at 800℃. In addition, YSZ thin films were prepared by a co-pressing and co-sintering process with powder pre-heated at 700℃. Single ceils were formed based on the films. Maximum power density of 470 mW/cm^2 was generated at 700 ℃ with humidified （3%H2O） H2 as the fuel.

关 键 词：固体氧化物燃料电池 钇稳定的氧化锆(YSZ) 薄膜 甘氨酸法 

分 类 号：TB321[一般工业技术—材料科学与工程]