▎ 摘　　要

NOVELTY - Bifunctional catalyst comprises cobalt nanoparticles and transition metal carbide nanoparticles physically and chemically bonded to nitrogen-doped graphene through the formation of an interfacial interface. USE - Bifunctional catalyst used in oxygen electrode used as a working electrode of a reversible fuel cell or a metal-air battery (claimed). ADVANTAGE - The bifunctional catalyst has high activity in both an oxygen generation reaction and an oxygen reduction reaction, can exhibit the oxygen generating reaction performance similar to the conventional expensive precious metal-based catalyst in alkaline conditions, and can efficiently promote both the non-aqueous oxygen generating reaction and the oxygen reduction reaction generated in the metal-air battery anode and metal-air battery electrode material using bifunctional catalyst is capable of charging and discharging more than hundred cycles. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) an electrode, which comprises bifunctional catalysts; and (2) a method for manufacturing bifunctional catalyst, which involves preparing a precursor mixture solution by mixing a cobalt precursor, a transition metal carbide precursor, a graphene precursor, and a nitrogen precursor with a solvent, evaporating the solvent in the precursor mixture solution to obtain a precursor mixture, heat treating the precursor mixture to produce a catalyst in which cobalt nanoparticles and transition metal carbide nanoparticles are physically and chemically bound to nitrogen-doped graphene to obtain desired bifunctional catalyst.