Abstract: Provided are an air electrode having a structure in which an anion exchange membrane and an air electrode catalyst layer are laminated and the anion exchange membrane is disposed in contact with an aqueous alkaline solution; and a metal-air battery, an alkaline fuel cell, and a water electrolysis device each having the air electrode. The air electrode of the present invention can reduce or solve various conventional problems of an air electrode in a metal-air battery, fuel cell, and the like, which use an aqueous alkaline solution as an electrolyte, and can maintain high performance for a long period of time.

Abstract: Disclosed are a method for producing an anode catalyst for a polymer electrolyte fuel cell, comprising a first supporting step of adhering at least one element selected from the group consisting of the elements of group 4, elements of group 5 and elements of group 6 of the periodic table to a conductive support, and subsequently conducting a heat treatment in a non-oxidizing atmosphere, and a second supporting step of adhering platinum and ruthenium on the support obtained in the first supporting step, and subsequently conducting a heat treatment in a non-oxidizing atmosphere; and an anode catalyst for a polymer electrolyte fuel cell obtainable in accordance with this method, the catalyst comprising catalytic metal components supported in a highly dispersed manner on a conductive support.

Abstract: An anode catalyst contains gold fine particles, and/or at least one member selected from the group consisting of titanium, vanadium, gallium, zirconium, niobium, cerium, tantalum, indium, and the oxides of these metals, and/or at least one member selected from the group consisting of platinum, ruthenium, and ruthenium oxides are coated on a conductive support.