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

对于固体氧化物燃料的实际使用，实现轻质、紧凑、大面积和低电阻的电池堆是必要的，并且与形成薄膜的传统方法相比，使用薄膜形状的陶瓷材料是重要的。 CVD、溅射和溶胶-凝胶法，从水溶液中合成陶瓷薄膜可以形成大面积、形状复杂的均匀薄膜，该技术不需要热处理，因为薄膜可能变形和破裂，这是有害的。电影。低成本工艺，因为不需要昂贵的设备，利用该技术的这些特性，可以通过逐渐改变溶液的组成、热系数来制造具有分级结构的燃料电池。通过在金属氟络合物溶液中添加能够与氟离子形成稳定络合物的硼酸，可以避免热应力导致的电池破裂。这个反应，通过在真空球形箱中合成氧化锆和镧过渡金属钙钛矿型氧化物，消除了空气中氧气的影响，并利用LB薄膜装置对材料的表面进行了精细控制。机理分析结果表明，晶种在水溶液合成中发挥着重要作用，通过该技术可以均匀沉积LaMnO_3颗粒。且在常温常压下在YSZ基底上高密度地进行。这一结果表明了制造分级结构的可能性。具有分级结构的燃料电池是有前途的解决方案。由于LaMnO_3颗粒的表面存在许多不规则现象，因此该电极也有望获得异常高的活性。