▎ 摘　　要

NOVELTY - A nitrogen-doped graphene load platinum (Pt)-based alloy nano electro-catalyst comprises 5-30 wt.% electro-catalyst of Pt-based binary alloy or Pt-based ternary alloy, and 70-95 wt.% nitrogen-doped graphene, where particle size of electro-catalyst of Pt-based binary alloy or Pt-based ternary alloy is 0.5-4.5 nm. USE - Nitrogen-doped graphene load Pt-based alloy nano electro-catalyst. ADVANTAGE - The catalyst has high catalytic activity, is stable and controllable. The method is simple and has low energy consumption. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included of the preparation of nano electro-catalyst comprising mixing graphene oxide, ethylene glycol and N-methyl pyrrolidone, ultrasonic dispersing for 1-3 hours to obtain suspension liquid, where ratio of graphene oxide to ethylene glycol to N-methyl pyrrolidone is 30-60:1100-2800:500-1600; adding metal salt solution and dihydrogen hexachloroplatinate hexahydrate (H2PtCl6.6H20), mixing, ultrasonically dispersing for 3 hours to obtain precursor, where ratio of metal salt solution and H2PtCl6.6H20 to graphene oxide is 5-30:95-70, concentration of graphene oxide is 2-10 g/l, and concentration of metal salt solution and H2PtCl6.6H20 is 5-20 g/l; heating in oil bath at 90-180 degrees C, condensing and refluxing for 5 hours to obtain black suspension; and vacuum filtering, washing with acetone, distilled water and absolute ethyl alcohol, and vacuum drying for 24 hours at room temperature.