Graphene aerogel with carbonized sugar as three-dimensional skeleton and preparation method of graphene aerogel

Abstract

The invention discloses graphene aerogel with carbonized sugar as a three-dimensional skeleton and a preparation method of the graphene aerogel. In the graphene aerogel, graphene oxide or reduced graphene oxide is loaded on the three-dimensional skeleton of the carbonized sugar in a single-layer or multi-layer structure; the average pore size of the graphene aerogel is 0.1-5.0 [mu] m, the specific surface area is 60-100 m < 2 > / g, and the mass content of the graphene oxide or reduced graphene oxide is 3-5%. The preparation method comprises the following steps: (1) mixing a sugar carbon source, graphene oxide and a catalyst, adding into water, stirring, dissolving and drying to obtain a carbon mixture; and (2) rapidly heating and reaming in flame, and washing. The raw materials of the graphene aerogel are easy to obtain, the pore size distribution of bubbles of the obtained aerogel is uniform, the distributed graphene is a single layer, the gas sensitivity to low-concentration gas is good, and gas adsorption and desorption are fast. The method is simple, high in repeatability, economical, environmentally friendly and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a graphene airgel and a preparation method thereof, in particular to a graphene airgel with carbonized sugar as a three-dimensional skeleton and a preparation method thereof. Background technique [0002] Graphene has been shown to be a promising material for high-performance gas detection due to its two-dimensional conjugated structure, high specific surface area, high electrical conductivity, diverse synthesis methods, and sensitivity to electrical interference caused by gas molecules. However, the properties of graphene materials often depend on the arrangement of its two-dimensional sheets. The inherent large π bond conjugated structure of graphene makes it prone to stacking. With a high specific surface area, it is hoped that the graphene sheets will be separated from each other to form a three-dimensional structure. [0003] Graphene airgel has a variety of structures, and the assembly method based on graphene oxide is m...

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Problems solved by technology

However, the airgel prepared by this method will also cause the accumulation of some graphene sheets

[0005] (2) The template method is to mount graphene sheets on a three-dimensional template. The graphene oxide airgel prepared by this method has a very high specific surface area. Generally, it can be used for the preparation of devices such as supercapacitors. However, due to the complex process of graphene oxide prepared by the template method, and the removal of the template is cumbersome, the production process and removal process of the template will produce a lot of harmful waste liquid.

However, the graphite walls produced by this method are still thick and cannot ensure the formation of graphite walls on all frames; moreover, such graphene films are not suitable for practical electronic chemical sensors compared with single-layer graphene.

[0011] To sum up, the above methods are all too complicated, and the obtained graphite material is stacked in layers, and has low sensitivity to low-concentration gases. It is urgent to find a raw material that is easy to obtain , the obtained airgel has uniform pore size distribution, and the distributed graphene is a single layer. It has good gas sensitivity to low-concentration gases, fast gas adsorption and desorption, high repeatability, economical and environmental protection, and a simple and convenient method to prepare three-dimensional graphite. ethylene foam as a commercial gas-sensitive material

[0012]Currently, there is no report on the use of carbonized sucrose to prepare aerogels with three-dimensional skeletons loaded with graphene

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