▎ 摘　　要

NOVELTY - A nitrogen-doped graphene/ferronickel hydrotalcite bifunctional catalyst is obtained by using a micelle as a template, forming graphene oxide/ferronickel hydrotalcite compound by assembling ferronickel hydrotalcite on graphene oxide, and simultaneously reducing and doping graphene oxide with a carbon nitride nano sheet. The catalyst is prepared by dispersing graphene oxide in ethylene glycol, adding nickel chloride hexahydrate and ferric chloride hexahydrate, mixing, dispersing in an aqueous solution, dripping carbon nitride nano sheet solution, washing, and drying. USE - Nitrogen-doped graphene/ferronickel hydrotalcite bifunctional catalyst is used in electrolysis of alkaline water in fuel cell cathode oxygen reduction reaction and anode oxygen evolution reaction (claimed). ADVANTAGE - The nitrogen-doped graphene/ferronickel hydrotalcite bifunctional catalyst has excellent activity in oxygen evolution and oxygen reduction under alkaline conditions, stability and methanol tolerance, and can be prepared by economical, simple and convenient process. DETAILED DESCRIPTION - A nitrogen-doped graphene/ferronickel hydrotalcite bifunctional catalyst is obtained by using a micelle as a template, forming graphene oxide/ferronickel hydrotalcite compound by assembling ferronickel hydrotalcite on graphene oxide under hydrothermal conditions, simultaneously reducing and doping graphene oxide with a carbon nitride nano sheet under hydrothermal conditions, and then obtaining nitrogen-doped graphene-ferronickel hydrotalcite spherical nano-composite. The catalyst is prepared by dispersing graphene oxide in ethylene glycol with concentration of 1 mg/mL for 1 hour, centrifuging at 3000 rpm for 10 minutes, obtaining graphene oxide dispersion, adding nickel chloride hexahydrate and ferric chloride hexahydrate to 20 mL graphene oxide dispersion with total metal ion concentration of 0.04 mol/L, stirring, adding 0.6 g sodium dodecyl sulfate, stirring, dripping 10 mL 0.16 g sodium hydroxide ethylene glycol solution, mixing, transferring resultant product to a reactor, reacting at 160 degrees C for 24 hours, centrifuging, separating, washing with ethanol and deionized water, drying, obtaining graphene oxide/ferronickel hydrotalcite composite, calcining melamine in nitrogen atmosphere at 500 700 degrees C for 4 hours, obtaining solid carbon nitride, dissolving 0.5 g carbon nitride in 14 mL concentrated sulfuric acid solution, stirring at room temperature for 2 hours, adding 50 mL deionized water, ultrasonically processing for 1 hour, washing resultant mixture, obtaining carbon nitride nano sheet solution, dispersing graphene oxide/ferronickel hydrotalcite composite in an aqueous solution, preparing solution with concentration of 2 mg/ml, dripping 30 mL carbon nitride nano sheet solution with concentration of 0.25-0.75 mg/mL, mixing at 180 degrees C for 20 hours, separating, centrifuging, washing with ethanol and deionized water, and drying.