▎ 摘　　要

NOVELTY - Preparing graphene-supported black phosphorus quantum dots involve weighing black phosphorus, dissolving it in an organic solvent after grinding in a glove box, pulverizing the obtained liquid with an ultrasonic cell pulverizer under ice bath conditions, and then centrifuging and taking supernatant and centrifuge again, take the supernatant and centrifuge, and taking the centrifuged supernatant to obtain the black phosphorus quantum dots. The graphene is added to the supernatant, manually grinded to obtain a mixed solution, and then performed ultrasonic dispersion. The obtained dispersion solution is centrifuged, the supernatant is removed, and the obtained precipitate is dried in a vacuum drying box to obtain a graphene-supported black phosphorus quantum dot. USE - Method for preparing graphene-supported black phosphorus quantum dots used for preparing electrocatalyst (claimed). ADVANTAGE - The method enables to prepare graphene-supported black phosphorus quantum dots that is simple, convenient to operate, low in cost, and beneficial to industrialized production, and has certain use value.