Reduced degradation of ion-exchange membranes in electrochemical fuel cells
    22.
    发明授权
    Reduced degradation of ion-exchange membranes in electrochemical fuel cells 有权
    电化学燃料电池中离子交换膜的降解降低

    公开(公告)号:US07537857B2

    公开(公告)日:2009-05-26

    申请号:US10738962

    申请日:2003-12-17

    IPC分类号: H01M8/02 H01M4/86

    摘要: A significant problem in PEM fuel cell durability is in premature failure of the ion-exchange membrane and in particular by the degradation of the ion-exchange membrane by reactive hydrogen peroxide species. Such degradation can be reduced or eliminated by the presence of an additive in the anode, cathode or ion-exchange membrane. The additive may be a radical scavenger, a membrane cross-linker, a hydrogen peroxide decomposition catalyst and/or a hydrogen peroxide stabilizer. The presence of the additive in the membrane electrode assembly (MEA) may however result in reduced performance of the PEM fuel cell. Accordingly, it may be desirable to restrict the location of the additive to locations of increased susceptibility to membrane degradation such as the inlet and/or outlet regions of the MEA.

    摘要翻译: PEM燃料电池耐久性的一个重大问题是离子交换膜的过早失效,特别是通过活性过氧化氢物质降解离子交换膜。 通过在阳极,阴极或离子交换膜中存在添加剂可以降低或消除这种降解。 添加剂可以是自由基清除剂,膜交联剂,过氧化氢分解催化剂和/或过氧化氢稳定剂。 然而,添加剂在膜电极组件(MEA)中的存在可能导致PEM燃料电池的性能降低。 因此,可能需要将添加剂的位置限制在对膜降解的易感性增加的位置,例如MEA的入口和/或出口区域。

    Process for preparing graft copolymers and membranes formed therefrom
    23.
    发明授权
    Process for preparing graft copolymers and membranes formed therefrom 失效
    制备由其形成的接枝共聚物和膜的方法

    公开(公告)号:US06828386B2

    公开(公告)日:2004-12-07

    申请号:US10251644

    申请日:2002-09-20

    申请人: Sean M. MacKinnon

    发明人: Sean M. MacKinnon

    IPC分类号: C08F246

    摘要: A process for preparing a graft copolymers is provided comprising exposing a polymeric base material to a dose of ionizing radiation, and then contacting the irradiated base material with a microemulsion comprising at least one fluorostyrenic monomer, water and water-miscible solvent. The graft copolymer may be formed into a membrane, including ion exchange membranes.

    摘要翻译: 提供了一种制备接枝共聚物的方法,包括将聚合物基材暴露于一定量的电离辐射,然后使经辐照的基材与包含至少一种氟代苯乙烯单体,水和水混溶性溶剂的微乳液接触。 接枝共聚物可以形成为膜,包括离子交换膜。

    Water insoluble additive for improving conductivity of an ion exchange membrane
    24.
    发明授权
    Water insoluble additive for improving conductivity of an ion exchange membrane 失效
    用于改善离子交换膜导电性的水不溶性添加剂

    公开(公告)号:US07601759B2

    公开(公告)日:2009-10-13

    申请号:US10962184

    申请日:2004-10-08

    IPC分类号: C08J5/22 H01M8/10

    摘要: A water insoluble additive for improving the performance of an ion-exchange membrane, such as in the context of the high temperature operation of electrochemical fuel cells. The insoluble additive comprises a metal oxide cross-linked matrix having acid groups covalently attached to the matrix through linkers. In one embodiment, the metal is silicon and the cross-linked matrix is a siloxane cross-linked matrix containing silicon atoms cross-linked by multiple disiloxy bonds and having acid groups covalently attached to the silicon atoms through alkanediyl linkers.

    摘要翻译: 用于改善离子交换膜的性能的水不溶性添加剂,例如在电化学燃料电池的高温操作的背景下。 不溶性添加剂包括具有通过接头共价连接到基质上的酸基的金属氧化物交联基质。 在一个实施方案中,金属是硅,并且交联基质是含有硅原子的硅氧烷交联基质,所述硅原子通过多个芳氧基键交联并且具有通过烷二基接头共价连接到硅原子上的酸基团。