Method for preparing nitrogen doped graphene aerogel through modification of plant extract

Abstract

The invention discloses a method for preparing nitrogen doped graphene aerogel through the modification of a plant extract. The method comprises the following steps: taking 1 to 10 parts of a graphene oxide solution, 0.5 to 12 parts of a nitrogen source, and 1 to 30 parts of a plant extract in parts by volume, stirring, and performing ultrasonic dispersion, so as to obtain a mixed liquor; shifting the mixed liquor into a high pressure reaction vessel, and ensuring that the mixed liquor is reacted for 12 to 20h at 80 to 200 DEG, so as to obtain hydrogel; percooling the hydrogel for 1 to 12h at 0 to 20 DEG C after the hydrogel is dialysed, and taking out and naturally drying the hydrogel, so as to obtain the nitrogen doped graphene aerogel. The graphene aerogel prepared through the method has high nitrogen doping content, lays a foundation for the preparation of various nitrogen doped graphene-based function materials, and can be used for preparing various microswitches, micro sensors, supercapacitors, lithium batteries, solar batteries, refractory materials, catalytic materials, adsorption materials and oil absorption materials. The preparation method is simple in technology and convenient to operate, and can realize large-scale production.

Description

technical field [0001] The invention relates to a method for preparing graphene airgel, in particular to a method for preparing nitrogen-doped graphene airgel by modifying plant extracts. Background technique [0002] The unique electrical, thermal and mechanical properties of graphene make it have broad application prospects in electronic devices, composite materials, sensors, energy storage and other fields. For all known reasons, the conductivity of graphene cannot be fully controlled because it has no band gap. Graphene is doped by replacing carbon atoms with heteroatoms including N, B, P, S, etc. to form point defects to open its band gap and modulate the conductivity type. Therefore, the element doping of graphene has become a research boom and has been reported by a large number of literatures in recent years. Nitrogen doping of graphene is the most common doping method, and various functional graphene materials based on nitrogen doping have been prepared. We know ...

AI Technical Summary

Problems solved by technology

Nevertheless, the nitrogen-doped graphene airgel structure under natural drying is usually unstable and prone to severe shape deformation.

As previously reported, boric acid is used in higher plants to strengthen the structure between cells, which can harden the cell wall and increase the support strength between cell walls. Although some work has studied the effect of boric acid on the preparation of graphene membranes and graphene airgel, But unfortunately, there is no direct use of plant extracts, which is more environmentally friendly and suitable for mass production, to prepare graphene aerogels, so we directly use plant extracts to strengthen the nitrogen-doped graphene aerogels. The cross-linking and bridging effect makes it strong enough to resist shape deformation during natural drying

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