Proton conducting membrane, process for its production, and fuel cells made by using the same
申请人:——
公开号:US20040062970A1
公开(公告)日:2004-04-01
The present invention provides relates to a crosslinkable, proton-conducting membrane having a crosslinked structure, excellent in heat resistance, durability, dimensional stability and fuel barrier characteristics, and showing excellent proton conductivity at high temperature, characterized by comprising (a) an organic/inorganic hybrid structure (A) covalently bonded to 2 or more silicon-oxygen crosslinks and, at the same time, having a carbon atom, and (b) an acid containing structure (B) having an acid group, covalently bonded to a silicon-oxygen crosslink and having an acidic group; and provides a fuel cell using the same membrane.
The present invention also provides a method for producing the proton-conducting membrane, comprising steps of preparing a mixture containing an organic/inorganic hybrid, crosslinkable compound (C) and compound (D), the former having 2 or more crosslinkable silyl groups and carbon atoms each being bonded to the silyl group via the covalent bond and the latter having a crosslinkable silyl group and acid group, as the first step; forming the above mixture into a film as the second step; and hydrolyzing/condensing or only condensing the hydrolyzable silyl group contained in the mixture formed into the film to form a crosslinked structure as the third step.
本发明提供了一种交联的质子导电膜,具有交联结构,优异的耐热性、耐久性、尺寸稳定性和燃料屏障特性,在高温下表现出优异的质子导电性能,其特征在于包括(a)与2个或更多硅氧交联共价键结合,同时具有碳原子的有机/无机杂化结构(A),以及(b)具有酸基,与硅氧交联共价键结合并具有酸性基团的酸含有结构(B);并提供使用该膜的燃料电池。本发明还提供了一种制备质子导电膜的方法,包括以下步骤:第一步,制备含有有机/无机杂化交联化合物(C)和化合物(D)的混合物,前者具有2个或更多可交联的硅基团,碳原子通过共价键与硅基团结合,后者具有可交联的硅基团和酸基团;第二步,将上述混合物形成成膜;第三步,水解/缩合或仅缩合形成成膜的可水解硅基团,形成交联结构。