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

为了使固体氧化物燃料实用化，必须实现具有大面积和低电阻的轻质和紧凑的电池堆，并且使用薄膜形状的陶瓷材料是重要的。与传统的薄膜制备方法如化学气相沉积法、溅射法、溶胶-凝胶法等相比，水溶液法制备陶瓷薄膜可以制备出大面积、形状复杂的均匀薄膜。该技术不需要热处理，热处理是有害的，因为薄膜可能变形和破裂。这是一个低成本的过程，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来制造具有梯度结构的燃料电池。通过制造具有梯度结构的燃料电池，热膨胀系数连续变化，并且可以避免电池由于热应力而破裂。通过添加硼酸，可使化合物稳定， 关于我们 Lex与氟离子接触到金属-氟络合物溶液中，氟络合物的水解进行。通过该反应，可以从水溶液中合成氧化锆和镧-过渡金属钙钛矿型氧化物。采用真空地球仪箱合成，消除了空气中氧气的影响，对原料进行了精细控制。利用LB膜装置，对基片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起着重要的作用。利用该技术，在常温常压下，可以在YSZ衬底上沉积出均匀、高密度的LaMnO_3颗粒。推测YSZ的部分溶解和LaMnO_3的沉积是同时进行的。这一结果表明，制造梯度结构的可能性。梯度结构的燃料电池是解决电池热应力断裂问题的一种很有前途的方法。由于LaMnO_3颗粒表面具有许多不规则性，因此电极也具有显著的高活性。少

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