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Formation of Thin Films of Solid Electrolytes by Plasma Spraying and Their Application to Solid Electrolyte Fuel Cells

等离子喷涂固体电解质薄膜的形成及其在固体电解质燃料电池中的应用

基本信息

批准号：
01850186
负责人：
OKUYAMA Masaru
金额：
$ 1.66万
依托单位：
Oyama National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

项目摘要

A solid electrolytic fuel cell (SOFC) is surperior to phosphoric acid fuel cells and molten carbonate fuel cell (MOFC) in such points that the electrolytes do not consume due to evaporation during operation and thickness of the elecrolyte films can be made thinner. Therefore, for setup of SOFC a unit cell can be compactly stacked and des*igned from a small scale to a large one. However, operation temperature is too high at 800 to 1000ﾟC because of low electric conductivity. In order to overwhelm this disadvantage, the electrolyte films should be made as thin as possible. Proton-conductive electrolytes will be used in future because of many advantages for cell reactions. The authors investigated formation of thin proton-conduetive electrolytic films by using the plasma-spray method and evaluated the films and they were applied to SOFC. SrCe_<0.95> Yb_<0.05>O_3-alpha was firstly employed as a proton-conductive electrolyte. Its sprayed films showed the proton conductivity. However, they gave lower specific electric conductivity by one or two ordersand lower mechanical strength. It was found that mixing of SrZrO_3 to SrCe_<0.95>Yb_<0.05>O_<3-> alpha improved mechanical strength without reducing electric conductivity. When plasma sprayed SrCe_<0.95>Yb_<0.05>O_<3->alpha was used as a solid electrolyte in a H_2-O_2SOFC and was characterized. The cell generated around 0.5 V as EMF at 1000ﾟC which was about a half of the theoretical EMF and its discharging current was found to be 0.3 mA/cm^2. This seems to be because H_2 gas penetrated through the sprayed electrolyte film. Denser films should be produced for improvement of the fuel cell performance.

固体电解燃料电池(SOFC)优于磷酸燃料电池和熔融碳酸盐燃料电池(MOFC)，因为在运行过程中电解液不会因蒸发而消耗，而且电解膜可以变薄。因此，对于SOFC的设置，可以将单元电池紧凑地堆叠并从小尺度设计到大尺度。但由于电导率较低，在800~1000ﾟC温度范围内工作温度过高。为了克服这一缺点，电解液薄膜应尽可能薄。质子导电电解液因其在电池反应中的诸多优点，将在未来得到广泛应用。研究了用等离子喷涂法制备质子导电薄膜，并对其进行了评价，并将其应用于固体氧化物燃料电池。首次将SrCe_&lt；0.95&gt；Yb_&lt；0.05&gt；O_3-α用作质子导电电解液。它的喷涂膜显示出质子的导电性。然而，它们的比电导率降低了一到两个数量级，机械强度也较低。结果表明，在不降低导电率的前提下，掺入0.95&gt；Yb_&lt；0.05&gt；O_&lt；3-&gt；α，提高了材料的机械强度。将等离子喷涂SrCe_&lt；0.95&gt；Yb_&lt；0.05&gt；O_&lt；3-&gt；alpha用作H_2-O_2SOFC的固体电解质，并对其进行了表征。电池在1000ﾟC时产生的电动势约为0.5V，约为理论电动势的一半，放电电流为0.3 mA/cm2。这可能是由于H2气体穿透了喷射的电解液膜所致。为了提高燃料电池的性能，需要生产更致密的薄膜。