A kind of powdery carbon aerogel and its preparation method and application

Abstract

The invention belongs to the technical field of an aerogel material and discloses a powdery carbon aerogel, as well as a preparation method and an application thereof. The powdery carbon aerogel is formed by carbon nanometer ball building units with a grain size of 20-300 nm by cross-linking and stacking; lots of micropores are formed on the surface of the carbon nanometer balls, and the specific surface area is 294-2472 m<2> / g. The powdery carbon aerogel disclosed by the invention is micron-level powder, can be directly used without being ball-milled in lots of application fields, and contributes to simplification of an application technique. The powdery carbon aerogel disclosed by the invention has a high specific surface area which is as high as 2472m<2> / g at most, and has wide potential application in preparation of electrode materials, medicine release control materials and adsorbing materials. Moreover, the building unit of the powdery carbon aerogel has good sphericity degree and grain size uniformity, and is benefit for precise building of a nanometer structure. The preparation method of the powdery carbon aerogel is simple, realizes moderate and easily controlled reaction condition, and is beneficial to industrialization amplification.

Description

technical field [0001] The invention belongs to the technical field of airgel materials, in particular to a powdered carbon airgel and its preparation method and application. Background technique [0002] As soon as the carbon airgel material appeared, it aroused great interest of researchers from all over the world. In recent years, a lot of research work has been carried out on the development of cheap raw materials, process simplification (especially drying process), structure control, performance characterization and application development. But today, airgel materials are still in the exploratory stage, both in terms of basic theoretical research and practical production and application. [0003] The current synthesis of such materials is usually based on the sol-gel reaction of phenolic solutions. There are many problems in this preparation method: (1) The phenolic resin nanoparticle units are obtained by the sol reaction, and then these units are cross-linked by gel...

AI Technical Summary

Problems solved by technology

There are many problems in this preparation method: (1) The phenolic resin nanoparticle units are obtained by the sol reaction, and then these units are cross-linked by gelation reaction to form a three-dimensional nano-network and then carbonized to form nano-carbon particle units. porous or quasi-nonporous

(2) The sol-gelation reaction is usually completed in a static closed container, which makes it difficult to quickly extract the heat during the polymerization process, and dangerous explosions will occur during the process of process amplification

(3) Most of the carbon airgel precursors obtained after the sol-gelation reaction have low mechanical strength and cannot withstand the strong capillary contraction force generated during the solvent drying process under normal pressure. Expensive techniques such as supercritical drying or freeze drying to remove solvents

(4) The airgel materials obtained by sol-gelation reaction are generally in the form of blocks, which cannot meet the diverse needs of applications

For example, carbon aerogels are often used as electrode materials for supercapacitors. At this time, it is necessary to grind the bulk airgel balls into micron-sized powders (~10 μm), which is not only time-consuming and labor-intensive, but also expensive.

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