Preparation and Evaluation of Proton Conductive Membranes for Medium Temperature Fuel Cells

中温燃料电池质子传导膜的制备与评价

基本信息

批准号：
14550669
负责人：
MATSUDA Atsunori
金额：
$ 2.3万
依托单位：
Toyohashi University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

Solid state proton-conductive membranes with high conductivity in the medium temperature range (100-200ーC) even under low humidity are highly required as the electrolytes for PEFCs. Since the operation of PEFCs in the medium temperature range improves the utilization of total electric power generated in the cells. and depresses the poisoning of Pt catalysts with CO in the fuel gases. In addition, working of PEFCs under low humidity permits to reduce the weight and volume of humidifiers. In the present work, proton conducting membranes based on sol-gel derived phosphosilicate (P_2O_5-SiO_2) gel have been fabricated for the application to medium temperature fuel cells as an electrolyte.Two types of proton conductive membranes, which show high conductivities even at medium temperatures with low humidity, have been successfully prepared. One is a composite sheet composed of phosphosilicate gel powder and organic polymer such as heat resistant polyimide. The other is a hybrid sheet in which inorganic and organic components derived from an organosilane such as 3-Glycidoxypropyltrimethoxysilane and phosphoric acid are covalently bonded.Fuel cells using a composite sheet composed of phosphosilicate (P_2O_5-SiO_2, P/Si=1 in mole ratio) gel powder and polyimide operated up to 150ーC under a relatively low water vapor, pressure. Maximum power density of the fuel cell increased with increasing operation temperature and was 28 mW cm^<-2> at 150 ℃ and 18 %RH. With respect to the hybrid type, fuel cells using a hybrid sheet derived from 3-Glycidoxypropyltrimethoxysilane and phosphoric, acid also continuously operated at 130 ℃.It was found that the addition of tin and tantalum as well as aluminum improved the chemical durability of phosphosilicate gels by depressing the leaching of phosphoric acid from the gels. At the same time, the improvement of durability of the gels resulted in a decrease in the proton conductivity.

即使在低湿度下，在中等温度范围内（100-200-C）的固态质子传导机制也很高，因为PEFC的电解质也很高。由于PEFC在中等温度范围内的运行可改善细胞中产生的总电力的利用。并用燃料气中的CO抑制PT催化剂的中毒。此外，在低湿度下，PEFC的工作允许减少加湿器的重量和体积。在目前的工作中，基于溶胶 - 凝胶衍生的磷酸化（P_2O_5-SIO_2）凝胶的质子导电膜已被制造，用于将其作为电解质作为中等温度燃料电池的应用。两种类型的质子导电膜，即使在中等温度下，在湿度较低的中等温度下也表现出很高的导电性，已经成功地制备了。一个是由磷酸化凝胶粉和有机聚合物（例如耐热二酰亚胺）组成的复合片。另一种是杂种片，其中无机和有机成分从有机硅烷（例如3-甘油氧基丙基三甲氧基硅烷和磷酸）共价键合。使用由磷酸化组成的复合板（p_2o_5-sio_2，p/sio_2，p/sio_2，p/sio = 1 In-colotio = 1 In-colecular and-coltotio = 1 In Molecular ate Molecular ate Molecular ate Molecular ate Molecult and Molecular yar cotio）。相对较低的水蒸气，压力。燃料电池的最大功率密度随着操作温度的升高而增加，在150°C和18％RH时为28 mW cm^<-2>。关于杂化型，使用源自3-糖氧化氧基三甲基氧基和磷酸的杂化板的燃料电池，酸也在130°C中连续运行。它发现锡和tantalum的添加以及通过磷酸化的磷酸化化学能力改善了磷酸化的化学耐药性，从而改善了磷酸化的磷酸化。同时，凝胶耐用性的提高导致质子电导率降低。