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La0.6Sr0.4CoO3阴极中温固体氧化物燃料电池的制备与性能研究
陶有堃
学位类型硕士
导师崔平 ; 王蔚国
2009-06-06
学位授予单位中国科学院研究生院
学位授予地点宁波
学位专业其它专业
关键词中温固体氧化物燃料电池 纳米粉体合成 Lsc阴极 Gdc阻挡层 电化学性能
摘要离子、电子混合导体La0.6Sr0.4CoO3 (LSC)在中低温范围具有高电导率、高催化性能,是一种很有前途的固体氧化物燃料电池阴极材料。本论文采用柠檬酸、EDTA络合方法,在溶液不同pH值条件下,通过添加表面活性剂优化粉体微结构,合成了团聚较低、粒度均匀的LSC阴极纳米粉体,在900℃煅烧后得到钙钛矿相结构,结晶和成相良好。1250℃烧结样品的电导率在600℃达2204 S/cm。 Ce0.9Gd0.1O1.95 (GDC)是目前最受关注的中低温电解质材料。本文以柠檬酸为络合剂并引入表面活性剂PVP合成GDC纳米粉体,适量PVP的添加有效解决了GDC粉体的团聚问题。粉体颗粒大小均匀,粒径15 nm左右,分散良好基本无团聚。粉体烧结性能良好,在1450℃样品致密度达98.2%,电导率在600℃达0.017 S/cm。采用两步烧结法可以在相对低的烧结温度下得到电性能较好的GDC阻挡层。 对LSC/GDC复合阴极构成及电性能进行的研究表明,含GDC 30 wt.%的阴极电化学性能较好。由于LSC与YSZ电解质兼容性较差,在850℃即发生反应,实验表明采用5~7微米的GDC阻挡层以及950℃的阴极烧结温度可避免界面反应发生,并且此条件下制备的阴极样品微结构和电化学性能最好,在700℃极化阻抗仅为0.06 Ωcm。阴极烧结温度升高导致界面反应加剧、电性能变差。在NiO/YSZ阳极、YSZ电解质上采用GDC阻挡层及LSC/GDC复合阴极,制成活性电极面积4×4 cm2的电池,功率密度在中温达到实用水平,650℃最大功率密度达0.42 W/cm2。电池在650℃、10A恒流放电,长期运行基本稳定,具有很大的应用潜力。
其他摘要La0.6Sr0.4CoO3 (LSC) material, a mixed ionic and electronic conductor, is regarded as a promising cathode for Intermediate Temperature Solid Oxide Fuel Cells (IT–SOFCs). In this work, the LSC nanopowders with low agglomerate were synthesized by a modified combined citrate–EDTA complexing method under various pH conditions, what’s more, a proper surfactant was added to the precursor solution to optimize the powder morphology. The perovskite phase of LSC formed completely after 900℃ calcining. The sintered LSC sample exhibited high conductivity in the temperature range from room temperature to 800℃. Ce0.9Gd0.1O1.95 (GDC) is considered as one of the most important electrolyte materials because of the high ionic conductivity at intermediate temperatures. Via a novel combined citrate and PVP method, uniform and well dispersed GDC nanopowders were synthesized, with the mean particle size of about 15nm. By enhancing the dispersible ability of the precursor solution, the small amount addition of PVP abated the agglomerate among the nanopowders effectively. The uniform nanopowder exhibited high sinterability, and a relative density of 98.2% was achieved after 1450℃ sintering. The ionic conductivity at 600oC was measured to be 0.017 S/cm, which is adequate for thin electrolyte of IT–SOFCs. The LSC/GDC composite cathode was investigated over the composition and electrochemical properties, and the cathode with 30% GDC electrolyte addition performed the best. The interfacial reaction between LSC cathode and YSZ electrolyte occured at 850℃, whereas LSC showed a good compatibility with GDC even at 1200℃. With a GDC buffer layer about 5μm thick, as well as a lower cathode sintering temperature at 950oC, the interfacial reaction can be avoided, and the cathode polarization resistance of 0.06 Ωcm2 at 700℃ was obtained. A higher sintering temperature (especially above 1050℃) aggravates the Sr diffusion and the interfacial reaction. The LSC/GDC composite cathode was applied to a solid oxide fuell cell comprised of a NiO/YSZ anode, an YSZ electrolyte and a GDC buffer layer, and the active electrode area was 4×4 cm2. The cell exhibited good power output properties at intermediate temperatures and the maximum power density reached 0.42 W/cm2at 650℃. What’s more, a relative stable power output was demonstrated in the 300 hours’ operating test at 650oC under constant current of 10A, which suggests a potential application.
语种中文
文献类型学位论文
条目标识符http://ir.nimte.ac.cn/handle/174433/257
专题硕/博士论文成果
推荐引用方式
GB/T 7714
陶有堃. La0.6Sr0.4CoO3阴极中温固体氧化物燃料电池的制备与性能研究[D]. 宁波. 中国科学院研究生院,2009.
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