Synthesis of Solid Oxide Fuel Cell with Graded Structure from Aqueous Solution

水溶液合成梯度结构固体氧化物燃料电池

基本信息

批准号：
11480118
负责人：
YAO Takeshi
金额：
$ 6.98万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11480118/
关键词：
Synthesis from aqueous solution Seed crystal Fuel cell Thin film Solid electrolyte Electrode catalyst Zirconia Lantanum-transition metal oxide 熱膨脹

项目摘要

For the practical use of solid oxide fuel, the realization of lightweight and compact cell stack with large area and low electric resistance is necessary and the use of ceramic materials in thin film shape is important. Comparing with conventional methods for forming thin film, such as CVD, spattering and sol-gel method, synthesis of ceramic thin film from aqueous solution can form uniform thin film with large area and complicated shapes. This technique needs no heat treatment, which is injurious because of the possibility of deformation and crack of the thin film. It is low-cost process, because no expensive equipment is required. Using these characteristics of this technique, fuel cell with a graded structure can be made by gradually changing the composition of the solution. By making a fuel cell with graded structure, a coefficient of thermal expansion changes continuously and the fracture of the cell by thermal stress can be avoided. By adding boric acid, which can make stable comp … More lex with fluoride ion to metal-fluoro-complex solution, hydrolysis of the fluoro-complex proceeded. By using this reaction, zirconia and lanthanum-transition metal perovskite type oxide could be synthesized from aqueous solution. By synthesizing in a vacuum globe box, the influence of oxygen in air was eliminated and fine control of the material was conducted. By using LB films apparatus, the surface of substrates was finely controlled. The result of analyzing the mechanism made it clear that seed crystals play an important role in the synthesis from aqueous solution. By using this technique, LaMnO_3 particles could be deposited uniformly and in high density on an YSZ substrate at normal temperature and under normal pressure. It is supposed that partial dissolution of YSZ and deposition of LaMnO_3 proceeded simultaneously. This result suggests the possibility of manufacturing graded structure. A fuel cell with graded structure is promising solution for the fracture problem of the cell by thermal stress. The electrode is also expected remarkably high activity, because the surface of the LaMnO_3 particles has many irregularities. Less

为了实际使用固体氧化物燃料，必须实现具有大面积和低电阻的轻质和紧凑的细胞堆栈，并且使用薄膜形状的陶瓷材料使用很重要。与形成薄膜的常规方法（例如CVD，空间和溶胶 - 凝胶方法）相比，从水溶液中合成陶瓷薄膜可以形成具有较大面积和复杂形状的均匀薄膜。该技术不需要热处理，由于薄膜变形和裂纹的可能性，这是有害的。这是低成本的过程，因为不需要昂贵的设备。使用这些技术的这些特征，可以通过逐渐改变溶液的组成来制作具有分级结构的燃料电池。通过制造具有分级结构的燃料电池，可以避免连续变化热膨胀的核心，并且可以避免通过热应力破裂。通过添加硼酸，这可以使稳定的富含曲线与金属氟化物复合溶液一起使用稳定的材料，从而进行了氟复合物的水解。通过使用该反应，可以从水溶液中合成氧化锆和灯笼 - 转换金属钙钛矿型氧化物。通过在真空盒中合成，消除了氧气在空气中的影响，并对材料进行了精细的控制。通过使用LB膜设备，对底物的表面进行了精心控制。分析该机制的结果表明，种子晶体在水溶液中的合成中起着重要作用。通过使用此技术，可以在正常温度和正常压力下在YSZ底物上均匀地沉积LAMNO_3颗粒。预计YSZ的部分溶解和LAMNO_3的沉积很简单。该结果表明制造分级结构的可能性。具有分级结构的燃料电池是通过热应力解决细胞断裂问题的有希望的解决方案。由于LAMNO_3颗粒的表面具有许多不规则性，因此也预计电极的活性也非常高。较少的