▎ 摘　　要

NOVELTY - The preparation method of palladium/graphene electro-catalyst involves taking certain amount of nano carbon material, adding mixed solution of palladium salt, sodium citrate and tannic acid, uniformly mixing, ultrasonically processing, and regulating the pH value to 2-7. USE - Preparation method of palladium/graphene electro-catalyst used in fuel cell, and electrolytic water and electrochemical sensor (claimed). ADVANTAGE - The method enables preparation of palladium/graphene electro-catalyst with excellent controllability, stability, and performance, and avoids the use of toxic reducing agent, in simple and economical manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for application of palladium/graphene electro-catalyst in fuel cell, and electrolytic water and electrochemical sensor.