| 摘要 |
PURPOSE:To prepare composite membrane selectively permeable for gaseous oxygen but prohibiting steam or carbon dioxide in air to permeate into the main body of an electrode, by integrally adhering a thin layer comprising hydrous or hydratable metal oxide on one side of a porous membrane. CONSTITUTION:As a porous membrane, for example, a porous fluorine resin film, a porous polycarbonate membrane or a porous cellulose ester membrane can be represented. As hydrous or hydratable metal oxide is defined by one having superior adsorptivity for water wherein adsorbed water can be a surface hydroxyl group, chemically or physiclally adsorbed water. Specific examples are stannic dioxide, zinc oxide or aluminum oxide alone or a composite in an arbitrary combination comprising two kinds or more of them. In the case of the composite membrane with a two-layered structure, a thin layer of hydrous or hydratable metal oxide is directly adhered to one surface of the porous membrane by a vapor deposition method or a sputtering method. |
