▎ 摘　　要

NOVELTY - A cobalt nitride-embedded porous nitrogen-doped graphene material comprises nitrogen-doped graphene and cobalt nitride nanoparticles. The nitrogen-doped graphene has a worm-like pore structure on the surface, and the cobalt nitride nanoparticles are embedded at the end of the worm-like pore structure. USE - The cobalt nitride-embedded porous nitrogen-doped graphene material is useful in an electrode material of a metal-air battery and/or an electrolytic water, and as an electrocatalyst for electrolyzing water, where the metal-air battery is a zinc-air battery including a liquid zinc-air battery or a solid-zinc air battery (all claimed). ADVANTAGE - The cobalt nitride-embedded porous nitrogen-doped graphene material exhibits effective multifunctional catalytic activity against oxygen reduction reaction, hydrogen evolution reaction, and oxygen evolution reaction in alkaline solutions. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing the cobalt nitride-embedded porous nitrogen-doped graphene material, which involves sequentially adding cobalt acetate and tannic acid to a graphene oxide dispersion and uniformly mixing to obtain a suspension, separating the solid material in the suspension, and performing pyrolysis by heating the mixture at not less than 600 degrees C in a mixed atmosphere of nitrogen and ammonia; (2) use of the cobalt nitride-embedded porous nitrogen-doped graphene material or the cobalt nitride-embedded porous nitrogen-doped graphene material obtained by the above preparation method in a metal-air battery and/or an electrolytic water; (3) a zinc-air battery, which comprises the cobalt nitride-embedded porous nitrogen-doped graphene material as an air cathode, where cobalt nitride is embedded in the porous nitrogen-doped graphene material and coated on carbon paper with a binder, and dried to obtain an air cathode; and (4) a method for electrolyzing water, which involves using the cobalt nitride-embedded porous nitrogen-doped graphene material or the cobalt nitride-embedded porous nitrogen-doped graphene material obtained by the above preparation method as an electrocatalyst, and using batteries to split water into hydrogen and oxygen, where the battery is a zinc-air battery.