▎ 摘　　要

NOVELTY - An ionic liquid covalently modified graphene-stripping hydrotalcite-like bifunctional oxygen catalyst is prepared by obtaining reddish brown exfoliated layered double hydroxide (ELDH) colloid solution using e.g. nickel chloride hexahydrate, obtaining graphene oxide by Hummer method, obtaining graphene oxide (GO)-ELDH hybrid, dispersing in deionized water, adding 1-butyl-3-aminopropylimidazole tetrachloroborate (I) as ionic liquid (IL), processing to obtain IL-graphene-ELDH hybrids. The exfoliated layered double hydroxide is nickel-iron bimetallic-type exfoliated hydrotalcite sheet. USE - Ionic liquid covalently modified graphene-stripping hydrotalcite-like bifunctional oxygen catalyst used for anodic oxygen evolution reaction of alkaline electrolyzed water and cathodic oxygen reduction reaction of fuel cell (claimed). ADVANTAGE - The ionic liquid covalently modified graphene-stripping hydrotalcite-like bifunctional oxygen catalyst has excellent electrical conductivity, bifunctional catalytic activity, dispersibility and methanol tolerance, and is prepared by a simple and economical method. DETAILED DESCRIPTION - An ionic liquid covalently modified graphene-stripping hydrotalcite-like bifunctional oxygen catalyst is prepared by dissolving nickel chloride hexahydrate and iron chloride hexahydrate in ultrapure water, so that total metal ion concentration is 0.2 mol/L, stirring, dissolving, mixing 14 mL 0.2 M urea and 2 mL 0.01 M trisodium citrate, transferring to a reaction vessel, reacting at 150 degrees C for 24 hours, centrifuging, washing thrice with deionized water and ethanol to dispersing obtained carbonate-layered double hydroxide in 1 mol/L sodium chloride and 3.3 mmol/L hydrochloric acid mixed aqueous solution, reacting under nitrogen atmosphere for 12 hours, filtering chloride-layered double hydroxide, dispersing in 0.1 mol/L aqueous sodium nitrate, reacting under nitrogen atmosphere for 12 hours, filtering, drying at room temperature for 2 hours to obtain nitrate-layered double hydroxide, dispersing in formamide, stirring under nitrogen atmosphere for 24 hours, centrifuging at 5000 rpm for 10 minutes to remove unstripped layered double hydroxide and to obtain 0.5-1.0 mg/mL reddish brown exfoliated layered double hydroxide (ELDH) colloid solution, preparing graphene oxide by Hummer method, adding 1 mg/mL graphene oxide (GO) to formamide, ultrasonically dispersing for 1 hour, centrifuging at 3000 rpm for 10 minutes to remove unstripped graphene oxide and stripped graphene oxide dispersion liquid, mixing with ELDH colloid solution, stirring at room temperature for 12 hours under sealed conditions, centrifuging at 5000 rpm for 10 minutes to obtain brown-black precipitate of GO-ELDH hybrid, dispersing 40 mg GO-ELDH hybrid in deionized water to a concentration of 0.5 mg/mL, slowly adding 20 mg ionic liquid (IL) and 20 mg potassium hydroxide, ultrasonically processing for 30 minutes, ultrasonically dispersing, heating at 40-80 degrees C for 24 hours, centrifuging at 4000 rpm for 5 minutes, washing thrice with deionized water and ethanol to obtain black solid particles of IL-graphene-ELDH hybrids. The exfoliated layered double hydroxide is nickel-iron bimetallic-type exfoliated hydrotalcite sheet. The ionic liquid is 1-butyl-3-aminopropylimidazole tetrachloroborate of formula (I).