Egg yolk-eggshell structure metal @ hollow covalent organic framework cage composite material, as well as preparation and application thereof

The invention discloses an egg yolk-eggshell structure metal @ hollow covalent organic framework cage composite material, which belongs to the field of nanometer materials. A preparation method comprises the steps of adopting tetrahydrofuran as a solvent, adding 2,4,6-triformylphloroglucinol, p-phenylenediamine and Pd NCs@ZIF-8, reacting for 24 hours at the room temperature, filtering, water washing, drying, placing the obtained sample into an acetic acid/1,4-dioxane solution system, reacting for 72 hours at the room temperature, filtering, water washing, drying, and obtaining the egg yolk-eggshell structure metal @ hollow covalent organic framework cage composite material. The egg yolk-eggshell structure metal @ hollow covalent organic framework cage composite material is the material wrapping a metal nanometer particle, has a special structure, and has a favorable effect on catalysis. The material is moderate in preparation condition, and simple in preparation operation, has a bettereffect on catalyzing p-n