项目来源

台湾省政府科研基金(GRB)

项目主持人

郭东昊

项目受资助机构

台湾省东华大学材料科学与工程学系暨研究所

立项年度

2007

立项时间

未公开

项目编号

NSC96-2623-7011-003-NU

研究期限

未知 / 未知

项目级别

省级

受资助金额

634.00千元台币

学科

化学工程；能源工程

学科代码

未公开

基金类别

应用研究/学术补助

关键词

金属支撑燃料电池 ; 密封填料 ; 热应力 ; 高温热压 ; metal-support fuel cell ; sealant ; thermal stress ; hot pressing

参与者

薛人恺

参与机构

未公开

项目标书摘要：利用化学能转为电能的燃料电池是发电的另一种选择，此种电力产生方式，可以防止CO及NOx产生。其中，如果燃料电池采用的燃料是氢气与氧气，不仅可输出大电力，更因输出水的副产物而没有环境污染。除了产生电力外，质子传导电解质也可应用於氢气侦测器及氢气帮浦，在新能源应用上十分重要。传统固态氧化物电解质厚度薄，於热循环下的热应力可能会使电解质破裂而产生燃料外溢之意外。目前多所展示的涂布式或刮刀型之电解质层於安全考量下，有因致密差与强度不足而造成电解质的可靠度差而有溢漏之问题，同时也呈现陶瓷材料无法广泛应用之硬脆与缺乏韧性之固有问题。此外，固态氧化物燃料电池要密封使燃料端与氧气端分开，就会有密封(sealing)的问题。一端是陶瓷，一端是金属，要使用填料密封，并能承受热循环应力，而不会於接合处产生破坏与破裂，此一问题愈是於温差大的环境产生的热应力愈大也就愈难解决，此问题已经是艰难的研究课题。本实验希望能开发出具有可靠性的SOFC结构，经多次热循环使用与热应力下，此固态氧化物燃料电池仍能够保有电池的完整性，即氧化物电解质不破裂，金属/陶瓷密封能够保持应有功能。第一年研究希望能克服热应力与热循环应力的问题，而能够制作一密封的电池腔，由铁基不绣钢与YSZ二者构成，此电池腔要达到密封与无破裂之裂缝，也能经历升降温的热疲劳测试，来保证燃料不外泄。於填料筛选阶段，将以铁基不绣钢/填料/YSZ 三明治结构的接合破裂与否作为材料选择之依据。第二年研究希望能够制作金属支撑型单胞电池组与性质量测。制作单胞电池组时是采用第一年的基础，在固态氧化物电解质两端涂覆电极、制作燃料流通多孔层，最後再成形与组装完成单胞电池组制作，并进行其高温的开路电压与功率密度的量测。

Application Abstract: Stimulated by the need of pollution control in most countries,activities in the development of devices converting chemical energy directly into electrical energy have increased.In addition to the electrical power generation,proton-conduction ceramic electrolytes can be applied to the hydrogen detector and hydrogen pump,both of which are also important for the new energy development.Solid oxide fuel cells have been developed for decades,however their applications have been limited due to the difficulties for high temperature engineering.The difficulties involves the cracking of the oxide electrolytes and the sealing between the fuels and the oxidants after fabrication or after cyclic uses,strength and oxidation resistance of metallic materials,oxidation of bipolar connectors,MEA materials selection etc.The sealing to prevent the mixing of fuels and oxidants has become much difficult for solid oxide fuel cells due to its high operation temperature above 800oC,where thermal stress,high temperature strength of metallic alloys,and high temperature oxidation or chemical reactions become problems.The sealing problem for SOFCs has been a great challenge,which also is one of the major problems it has suffered for commercialization.In this research,we would like to develop a reliable SOFC structure,which can endure the thermal stress and thermal fatigue without cracking of solid electrolytes and the sealing.During the first year work,our objective is to overcome the problems of thermal stress and thermal fatigue for later the manufacture of the fuel cells.The components of SOFCs are composed of the iron-based stainless steel and the MEA assembly.To solve the sealing problem existing between the stainless steel and the Y-ZrO2 electrolyte,different sealants are chosen to be placed between the stainless steel and electrolyte for forming a sandwich structure.The sandwich structure is used to evaluate the sealant performance by judging if there are cracks existing after fabrication or after thermal fatigue tests.The survival material combination and processing conditions will be applied for the second year research.During the second year work,our objectives are to fabricate a metal-support solid oxide fuel cell and to measure its performance.This fuel cell needs to resist thermal cracking and thermal cyclic cracking.The electrochemical performance of the survival solid oxide fuel cell will also be evaluated under high temperature.If successful,a reliable and safer SOFC can be obtained.

项目受资助省

台湾省