▎ 摘　　要

NOVELTY - A preparation method of nitrogen-doped carbon nano-tube embedded with iron-cobalt oxide coated iron-cobalt alloy heterogeneous particles, involves uniformly mixing (S10) carbon nitrogen source, iron transition metal salt and solvent to obtain first mixed solution, gradually adding (S20) the cobalt transition metal salt solution into the first mixed solution, and fully reacting to obtain second mixed solution, mixing (S30) with oxidized graphene aqueous solution, after fully reacting, separating solid and liquid, keeping solid, calcining (S40) the solid, raising the temperature, continuously calcining, after fully reacting, cooling, and removing impurities to obtain nitrogen-doped carbon nano-tube embedded with iron-cobalt alloy particles, heating (S50) the nitrogen-doped carbon nano-tube embedded with the iron-cobalt alloy particles to 160-420°C to calcine under the oxygen-containing atmosphere, after fully reacting, cooling to room temperature to obtain final product. USE - Preparation of nitrogen-doped carbon nanotubes for use as catalyst for zinc-air battery (claimed). ADVANTAGE - The method enables to prepare nitrogen-doped carbon nano-tube embedded with iron-cobalt oxide coated iron cobalt alloy heterogeneous particles, which has excellent oxygen reduction reaction and oxygen evolution reaction bifunctional catalytic performance, and avoids agglomeration of the iron cobalt alloy nano-particles for electronic transmission. DETAILED DESCRIPTION - A preparation method of nitrogen-doped carbon nano-tube embedded with iron-cobalt oxide coated iron-cobalt alloy heterogeneous particles, involves uniformly mixing (S10) carbon nitrogen source, iron transition metal salt and solvent to obtain first mixed solution, gradually adding (S20) the cobalt transition metal salt solution into the first mixed solution, and fully reacting to obtain second mixed solution, uniformly mixing (S30) the second mixed solution with the oxidized graphene aqueous solution, after fully reacting, separating solid and liquid, keeping solid, calcining (S40) the solid at 300-500°C under inert atmosphere or reducing atmosphere, after fully reacting, raising the temperature to 700-1000°C, continuously calcining, after fully reacting, cooling to room temperature, and removing impurities to obtain nitrogen-doped carbon nano-tube embedded with iron-cobalt alloy particles, heating (S50) the nitrogen-doped carbon nano-tube embedded with the iron-cobalt alloy particles to 160-420°C to calcine under the oxygen-containing atmosphere, after fully reacting, cooling to room temperature to obtain final product. INDEPENDENT CLAIMS are included for the following: 1. nitrogen-doped carbon nano-tube embedded with iron-cobalt oxide coated iron cobalt alloy heterogeneous particles; and 2. an application of the nitrogen-doped carbon nano-tube embedded with iron-cobalt oxide coated iron-cobalt alloy heterogeneous particles as catalyst for zinc-air battery. DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart showing the preparation method of nitrogen-doped carbon nanotubes. (Drawing includes non-English language text) S10Step to uniformly mix carbon nitrogen source, iron transition metal salt and solvent S20Step to gradually add cobalt transition metal salt solution into first mixed solution S30Step to mix second mixed solution with oxidized graphene aqueous solution S40Step to calcine solid S50Step to heat nitrogen-doped carbon nano-tube embedded with iron-cobalt alloy particles