There is disclosed a composite membrane and an air electrode for use in hydrogen-oxygen fuel cells, metal-air cells and oxygen sensors. The composite membrane includes a porous membrane having micropores with a thin layer affixed thereto. The thin layer having metallic oxide in a carbon matrix, so that...http://www.google.de/patents/US4599157?utm_source=gb-gplus-sharePatent US4599157 - Oxygen permeable membrane
