▎ 摘　　要

NOVELTY - Palladium/graphene core-shell structure micro/nano crystal catalyst comprises 4N germanium-cored micro/nano crystal catalyst of the palladium/graphene shell core structure as core layer, palladium/graphene as shell layer and the 4N crucible is a fine crucible with a purity of not greater than 99.99% prepared by an alkaline electrodeposition process. USE - Used as palladium/graphene core-shell structure micro/nano crystal catalyst. ADVANTAGE - The catalyst has low cost and high catalytic activity, and is easy to recycle and utilize. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing palladium/graphene shell-core structure micro/nano crystal catalyst, comprising (i) adding the sodium hydroxide into the ultrapure water, stirring the mixture, adding the ceria coarse powder, reacting, stirring, adding cleaning agent, purifying and filtering the electrolyte; (ii) cooling the electrolyte prepared in step (i) to room temperature, adding additives, stirring, dissolving completely, conducting constant voltage predeposition and constant current electrodeposition, obtaining electrodeposited tantalum block and stripping the electrodeposited tantalum block from the electrode plate, washing with ultrapure water and drying to obtain 4N hydrazine; and (iii) ball milling the 4N hydrazine, adding the resulting micro-nanocrystals into ethylene glycol, stirring at room temperature, adding palladium salt and graphene oxide mixed solution, mixing, adding hydrazine hydrate, heating the reaction, centrifuging, filtering and drying.