▎ 摘　　要

NOVELTY - A honeycomb nanosheet array of nickel cobalt oxide/reduced graphene oxide/foam nickel is prepare by forming a honeycomb nanosheet array structure by vertically interlacing an ultrathin nickel cobalt nanosheet of 110x 11 nm vertically stacked on a graphene-modified foamed nickel surface by a single layer of 10.8 nm ultrafine cobalt nickel nanoparticles, obtaining a graphene/foam nickel substrate by adding citric acid to a graphene suspension and hydrothermal treatment, performing a citric acid assisted liquid phase coprecipitation and an appropriate calcination to obtain the finished product. USE - Honeycomb nanosheet array of cobalt cobalt oxide/reduced graphene oxide/foam nickel for super capacitor electrode. ADVANTAGE - The honeycomb nanosheet array of nickel cobalt oxide/reduced graphene oxide/foam nickel has excellent super-capacitive energy and cycle stability, and its preparation method in simple, mild condition and environment-friendly manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing a honeycomb nanosheet array nickel cobaltate/reduced graphene oxide/foam nickel, which involves dispersing a graphite oxide gel in deionized water for 15-25 minutes to obtain a graphite oxide suspension, adding citric acid for further ultrasonic for 10 minutes, and pouring into a Teflon (RTM: PTFE)-lined autoclave, immersing the pretreated foamed nickel in the graphite oxide suspension, reacting hydrothermally at 110-130 degrees C for 5-7 hours, after the reaction is finished, naturally cooling to room temperature, washing the obtained product repeatedly with deionized water, and freeze-drying 2-3 hours, obtaining graphene/foam nickel matrix graphene oxide/foam nickel, placing the graphene oxide/foam nickel in four-necked flask containing 100-150 mL deionized water, 5-30 mg citric acid is added under continuous stirring at a rate of 0.5-2 ml/min, adding sodium hydroxide lye, controlling the solution pH to 10 plus minus 0.1, stabilizing for 5-10 minutes, dissolving nickel nitrate hexahydrate and cobalt nitrate hexahydrate in deionized water to form mixed salt solution, adding at a rate of 0.5-2mL/min, mixing the salt solution and the lye to stabilize the pH of the solution at 10 plus minus 0.1, after the dropwise addition of the mixed salt solution is completed, transferring the obtained graphene oxide/foam nickel -containing slurry to a Teflon (RTM: PTFE) reaction vessel, and crystallizing at 80-100 degrees C for 5-7 hours, after the reaction is completed, naturally cooling to room temperature, washing the obtained product in deionized water, freeze-drying for 2-3 hours to obtain a nickel cobaltate precursor/reduced graphene oxide/foam nickel, heating the product in a nitrogen atmosphere at a flow rate of 100 mL/min at a temperature of 2 degrees C/min to 200-400 degrees C for 2-3 hours to obtain to obtain the finished product.