Personalizedly customized reticular porous carbon and preparation method thereof

Abstract

The invention discloses personalizedly customized reticular porous carbon and a preparation method thereof. The reticular porous carbon has a precise personalizedly customized shape and internal micro pores. The porosity of the reticular porous carbon is 70%-99.5%, the diameter of inscribed circles of all faces of micro polyhedrons forming the reticular porous carbon is 0.2-3 mm, and the diameter of inscribed circles of cross sections of polyhedron connecting rods is 0.02-1.5 mm. The preparation method comprises the following steps: designing a shape contour and an internal pore structure of a porous digital model; preparing a reticular porous carbon precursor by using a material-increasing preparation method; filling the interior of the porous carbon precursor with a burying sintering material; placing the porous carbon precursor filled with the burying sintering material in a 500-1000 DEG C vacuum or a protecting atmosphere, and carrying out pyrolysis; and finally, removing the burying sintering material, then carrying out 1100-3000 DEG C graphitization treatment to obtain the graphitized reticular porous carbon. The method overcomes the defects of distortion and shrinkage deformation of a porous polymer in a pyrolysis process, and makes up for the shortcomings that a traditional reticular porous carbon preparation method difficultly realizes precise control of a macroscopic shape and a micro pore structure.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of manufacturing reticular porous carbon, and in particular relates to a personalized and customized reticulated porous carbon and a preparation method thereof. [0003] Background technique: [0004] Reticular porous carbon materials are a class of porous carbon materials with excellent properties, which have the following advantages: light weight, high interconnected porosity, high electrical conductivity, high thermal conductivity, excellent high temperature stability, strong adsorption, etc. Mesh porous carbon materials are widely used in thermal energy storage, adsorption and separation, chemical catalysis, electrode materials and other fields, especially as carbon skeleton support materials for the preparation of porous metals, which have shown extremely important functions and significance. [0005] Although there are many kinds of preparation methods of reticulated porous carbon, they all have...

AI Technical Summary

Problems solved by technology

The foaming method is to use the carbon precursor under the action of the blowing agent to generate a large number of bubbles through certain physical and chemical changes, and then rapidly solidify and pyrolyze a type of network porous carbon formed. The carbon precursor is mainly an organic substance such as pitch. The main disadvantages of this method are the complicated preparation process, difficult control of pore morphology, low pore connectivity, and difficulty in preparing porous carbon with complex shapes.

The template method includes a variety of preparation methods. The most widely used method is to use polyurethane foam as a template, then impregnate organic matter with high carbon residues as a carbon precursor, and finally solidify and pyrolyze to prepare reticular porous carbon. This method almost completely replicates polyurethane foam. shape, forming a very high connected porosity, and the shapes of the pores are almost all dodecahedrons and tetradecahedrons. However, it is still difficult to directly prepare the network porous carbon with complex shapes, and its microscopic pore shape is also difficult to achieve orderly Control manufacturing; Another template method is to use removable spheres as pore-forming templates, then fill the gaps of the spheres with carbon precursors, and then solidify and pyrolyze to form porous carbon networks. In addition to the above shortcomings, this method also has There are problems such as complex process and low connected porosity

The direct pyrolysis method has gradually been paid attention to as a method with a relatively simple process. For example, polymer organic matter, animal bones, plants, etc. are directly used as carbon precursors to prepare network-shaped porous carbon, especially the preparation of complex carbon by additive manufacturing or mold method. shape and microscopic pores of polymeric organic precursors, and then directly pyrolyze to form porous carbon. shrinkage deformation

Images