▎ 摘　　要

NOVELTY - A nickel-cobalt sulfide/graphene composite zinc-air battery bifunctional catalyst preparing method involves weighing a cobalt nitrate hexahydrate, nickel nitrate hexahydrate and urea and dissolving in a mixed solution of distilled water and isopropanol and stirring the mixed solution and dispersing ultrasonically. The resulting mixture is transferred to an autoclave and sealed and reacted. The resulting precipitate is collected, washed with distilled water and anhydrous ethanol, calcined, cooled to room temperature and grounded into a powder to obtain a nickel cobaltite precursor. A nickel cobaltite precursor, sodium sulfide non-ahydrate and graphene dissolved in distilled water, stirred and dispersed. The mixture is transferred to an autoclave and reacted. The black precipitate is collected and washed with distilled water and ethanol, dried, calcined at a certain temperature, naturally cooled to room temperature and ground to a powder to obtain the finished product. USE - Method for preparing nickel-cobalt sulfide/graphene composite zinc-air battery bifunctional catalyst. ADVANTAGE - The method enables preparing nickel-cobalt sulfide/graphene composite zinc-air battery bifunctional catalyst with high oxygen reduction performance and oxygen evolution performance in the air electrode. DETAILED DESCRIPTION - A nickel-cobalt sulfide/graphene composite zinc-air battery bifunctional catalyst preparing method involves weighing a certain mass ratio of cobalt nitrate hexahydrate, nickel nitrate hexahydrate and urea and dissolving in a mixed solution of distilled water and isopropanol, where the distilled water to isopropanol is present in the concentration volume ratio of 1:3 and stirring uniformly the above mixed solution and dispersing ultrasonically for 0.5-1 hours. The resulting mixture is transferred to an autoclave and sealed and reacted at 110-140 degrees C for 8-14 hours. The resulting precipitate is collected, washed with distilled water and anhydrous ethanol for 3-5 times at 60-80 degrees C for 8-12 hours, calcined at a certain temperature for 1-6 hours, cooled to room temperature and grounded into a powder to obtain a nickel cobaltite precursor. A certain mass ratio of nickel cobaltite precursor, sodium sulfide non-ahydrate and graphene dissolved in distilled water, stirred at room temperature for 30-60 minutes, dispersed for 0.5-5-1 hours. The mixture is transferred to an autoclave for sealing and reacted at 110-140 degrees C for 8-14 hours. The black precipitate is collected and washed with distilled water and ethanol for 3-5 times, dried at 60-80 degrees C for 8-12 hours, and calcined at a certain temperature for 1-6 hours to obtain the finished product.