The invention relates to a preparation method of nickel-plated graphene hollow spheres, and belongs to the field of preparation of wave-absorbing materials. The graphene is self-assembled to form a hollow sphere structure under the action of a rotating external force and a Van der Waals force, chemical nickel plating is carried out by utilizing a hydrothermal method while the graphene is self-assembled, a metal with the electrode potential lower than that of nickel in the plating solution is oxidized and corroded to release electrons and the electrons are conducted to the graphene, the electrons obtained by nickel ions on the surface of the graphene are reduced to form an autocatalytic active center, and under the cooperation effect of a reducing agent, a nickel plating layer is graduallydeposited with the active center as the basis to form a nickel-plated graphene ball of a hollow structure. The method disclosed by the invention is simple to operate, low in cost, high in a pelletizing rate and good in repeatability. The prepared nickel-plated graphene hollow spheres can exert excellent wave-absorbing performances of nickel and graphene, are low in overall density of particles, and have a good application prospect in the field of wave-absorbing materials.

Preparation method of nickel-plated graphene hollow spheres

The invention particularly relates to a preparation method of nickel/ graphene composite powder for rapid laser prototyping. The preparation method comprises the following steps 1, graphene is added into a dispersing agent for ultrasonic dispersion, and a graphene dispersion liquid is prepared; 2, a nickel source is dissolved in the graphene dispersion liquid obtained in the step 1 so as to obtaina solution A, imidazole organic ligand is dissolved in a solvent to obtain a solution B, the solution B is added into the solution A, and the mixture is filtered to the graphene loaded with nickel particles after leaving the mixture to stand for at least 16 hours; and 3, the graphene loaded with the nickel particles obtained in the step 2 is put into an aqueous solution, the nickel source, a reducing agent, a complexing agent and an adjusting agent are added after ultrasonic dispersion is carried out, the pH value is adjusted to 8-9 after uniformly mixing, reacting is carried out at 50-95 DEGC for at least 0.5 hour, the solid is washed after solid-liquid separation is carried out, the nickel/grapheme powder is obtained by drying, and the powder can be uniformly mixed with the nickel powder and is used for laser cladding and fusion molding of a laser selection area. According to the method, the preparation process is simple and controllable, an obtained product is excellent in performance, and the method is convenient for large-scale industrial application in the field of rapid laser prototyping.

Li Xiaofeng

Papers

Preparation method of nickel/ graphene composite powder for rapid laser prototyping