▎ 摘　　要

NOVELTY - Preparing monoatomic material comprises (1) mixing and stirring choline chloride and ethylene glycol to form transparent solution A, (2) adding nickel chloride hexahydrate and cobalt chloride hexahydrate into solution A, stirring to obtain dark green solution B, adding graphene oxide particles to solution B, and stirring to obtain suspended mixed solution C, (3) pouring mixed solution C into electrolytic cell and placing it in magnetic stirring electric heating mantle, and utilizing electrochemical workstation to apply voltage to electrolytic cell, (4) placing the sample prepared in step (3) into porcelain boat, adding urea in another porcelain boat, placing porcelain boat into tubular furnace and fed with argon, heating, calcining, cleaning, and drying, and (5) using sample prepared in step (4) as working electrode to obtain three-electrode system, adding solution A to electrolytic cell containing three-electrode system, and using cyclic voltammetry to anchor single atoms. USE - The method is useful for preparing monoatomic material, which is used in research field, including oxygen evolution reaction, oxygen reduction reaction, carbon dioxide reduction reaction, and nitrogen reduction reaction. ADVANTAGE - The method uses the eutectic solvent, has a wider electrochemical window, and has higher viscosity, and can reduce the mass transfer action of gold, silver, palladium metal atoms in the electrolyte to reduce the deposition amount, which is good for forming single atom. In addition, the solvent is non-toxic, has degradability and can be recycled, using the solvent to directly prepare gold single atom material by electrochemical method is green environmentally friendly controllable synthesis new process. The method introduces the second phase single layer graphene oxide has more defects, can be embedded nitrogen atom, strong electronegative element nitrogen element introduction can improve the whole carrier of gold and silver single atom anchoring effect, and ensures the stability of gold in the whole system.