▎ 摘　　要

NOVELTY - The method involves: (i) placing trisodium citrate and copper(II) sulfate pentahydrate into three-necked flask, adding water, stirring under nitrogen atmosphere to obtain mixed solution, adding graphene oxide into clean beaker, covering with preservative film, placing mixed solution on heater, magnetically stirring and heating, transferring remaining mixed solution into stainless steel reaction kettle, adding concentrated ammonia water, placing in oven, and heating to obtain nitrogen-doped reduced graphene oxide; (ii) adding nitrogen-doped reduced graphene oxide into sodium borohydride solution, ultrasonically processing, and stirring to obtain copper/nitrogen-doped reduced graphene oxide; and (iii) adding ascorbic acid into copper/nitrogen-doped reduced graphene oxide, dropwise adding chloroplatinic acid hexahydrate, heating and centrifuging reactant, removing supernatant, collecting precipitate, washing with ultra-pure water and ethanol, and drying overnight in vacuum drying box. USE - Preparation of nitrogen-doped graphene-loaded binary platinum-copper core-shell structure nanocatalyst used in electrocatalytic oxygen reduction reaction in ionic liquid (all claimed). ADVANTAGE - The nitrogen-doped graphene-loaded binary platinum-copper core-shell structure nanocatalyst shows more excellent oxygen reduction electrocatalytic activity than platinum carbon in ionic liquid, and has good application prospect in electrocatalytic oxygen reduction reaction field. The method has simple operation, easy control, and can be applied in large scale. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for nitrogen-doped graphene-loaded binary platinum-copper core-shell structure nanocatalyst, prepared by above method.