METHOD OF PRODUCING ANTIOXIDANT WITH IMPROVED ANTIOXIDANT ABILITY AND DISPERSION PROPERTY FOR MEMBRANE-ELECTRODE ASSEMBLY

Disclosed is a method of producing an antioxidant that has excellent antioxidant ability and is well dispersed when applied to a membrane-electrode assembly (MEA). The method includes a step of preparing a powder including reduced metal oxide and a step of mixing the powder with a powdery ionomer to obtain an antioxidant in which the ionomer is bound to the surface of the reduced metal oxide.