Method for preparing three-dimensional porous graphene material

A method for preparing a three-dimensional porous graphene material, the method comprising:

• a) constructing a CAD model corresponding to a required three-dimensional porous structure, and designing an external shape and internal structure parameters of the model comprising a pore size, a porosity, and a pore shape, respectively;
• b) based on the CAD model constructed in a), preparing, by using additive manufacturing in the presence of an inert gas, a three-dimensional porous metal structure having a shape corresponding to that of the CAD model with a metal powder as material, wherein, the metal powder is nickel, copper, iron, or cobalt, an average particle size of the metal powder is 5-50 μm, and a particle shape of the metal powder is spherical or approximately spherical;
• c) heating the three-dimensional porous metal structure to a temperature of 900° C.-1500° C. for 4-24 hrs in the presence of the inert gas, cooling the three-dimensional porous metal structure to room temperature;
• performing sand blasting and ultrasonic cleaning on the three-dimensional porous metal structure, to acquire a metal template of the required three-dimensional porous structure;
• d) placing the metal template in a tube furnace in the presence of mixed gases of the inert gas and hydrogen and heating the metal template to 800-1000° C.;
• standing for 0.5-1 hr, introducing a carbon source to the tube furnace for continued reaction, cooling resulting products to room temperature in the presence of the inert gas, to yield a three-dimensional graphene grown on the metal template;
• and
• e) preparing a corrosive solution having a molar concentration of 1-3 mol/L;
• immersing the three-dimensional graphene prepared in d) in the corrosive solution, refluxing the corrosive solution at 60-90° C. until the metal template is completely melted;
• washing and drying the three-dimensional graphene to yield a three-dimensional porous graphene material, wherein, internal structure parameters comprising a pore size, a porosity, and a pore shape and external shape of the three-dimensional porous graphene material are the same as those of the CAD model constructed in a).