Ion-conductive polymeric composite membrane, membrane-electrode assembly, fuel cell, and process for producing ion-conductive polymeric composite membrane

摘要

An ion-conductive polymer composite membrane is provided which has both high gas barrier properties and high protonic conductivity. The ion-conductive polymer composite membrane includes an ion-conductive polymer and ion-conductive materials. The ion-conductive materials each include i) an inorganic layered structure including a plurality of layers formed of an inorganic compound and ii) a sulfobetaine-type or hydroxysulfobetaine-type ampholytic surfactant. The ampholytic surfactant is present between the layers formed of an inorganic compound. The present invention further provides a membrane-electrode assembly and a fuel cell which use the ion-conductive polymer composite membrane, and a process for producing the ion-conductive polymer composite membrane.