Abstract: The invention provides an electrode for use in a primary metal/air battery or in a hydrogen-oxygen fuel cell comprising a current-collecting metallic structure and a metallic foamed or fiber mat having a first surface attached to a first surface of the structure, a second surface of the mat being impregnated with an inner hydrophobic waterproof barrier layer coated with an outer active catalytic layer.

Abstract: The invention provides an air cathode in combination with an oxygen-rich electrolyte-immiscible organic fluid for supplying oxygen thereto, as well as providing metal/air batteries and hydrogen-oxygen fuel cells incorporating the same.

Abstract: The invention provides a bipolar electrode for use in a primary metal/air battery of the type having a metallic slurry anode, the electrode comprising a current-collecting, electrolyte-impervious metallic structure having a first surface for collecting current from the metallic slurry anode, and a metallic air cathode spaced from the structure and having a plurality of electrically-conductive protrusions extending at least from a central area of a first surface thereof and attached to a second surface of the structure, a second surface of the air cathode being provided with an inner hydrophobic waterproof barrier layer which is impermeable to electrolyte but permeable to oxygen gas and coated with an outer active catalytic layer.