▎ 摘　　要

NOVELTY - Preparing high-graphene coated palladium-zinc (Pd-Zn) alloy catalyst with high stability, comprises (i) dissolving precursor synthetic zinc salt in the methanol solution as solution 1, and dissolving dimethyl imidazole in the methanol solution as solution 2, mixing the solution 1 and solution 2 according to the volume ratio of 1:1-5, stirring for 6- 24 hours, centrifuging and drying to obtain the precursor, (ii) taking 100-300 mg precursor, re-dispersing in the methanol solution, forming dispersion, ultrasonically dispersing for 30 minutes, adding a palladium salt to the dispersion, continuously adding acetate as the modifying agent, stirring for 10-12 hours, centrifuging and drying to obtain the alloy catalyst raw material the adding amount of the palladium salt is 5-10 mg, the adding amount of acetate is 30-150 mg, and (iii) uniformly grinding the powder under nitrogen or argon atmosphere at 800-1000°C, heating rate 1-5°C/minute, and annealing 1-3 hours. USE - The catalyst is useful as hydrogen fuel cell oxygen reduction catalyst (claimed). ADVANTAGE - The method is simple, low in cost, and can be mass-produced in batches. The catalyst has unique graphene-coated structure, and the alloy particles are bound by the graphite layer, plays a role of physical isolation, reduces the shedding and aggregation of the catalyst in practical applications, prevents the disappearance of active sites, and improves the electrochemical performance of the catalyst as a whole, mass activity loss rate of the catalyst is less than 5%, and has excellent stability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for high-graphene coated palladium-zinc (Pd-Zn) alloy catalyst with high stability.