Microporous graphene aerogel and preparation method thereof
A technology of graphene airgel and graphene hydrogel, which is applied in the direction of graphene, chemical instruments and methods, nano-carbon, etc., can solve the problem that the pore size of graphene airgel is difficult to control, and achieve the goal of optimizing electrochemical performance Effect
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Embodiment 1
[0037]Graphene oxide was prepared by modified Hummers method using flake graphite as raw material. After the prepared graphene oxide dispersion was centrifuged at a speed of 10,000 rpm for 1 h with a centrifuge, the clear solution in the upper layer was monodisperse few-layer graphene oxide, and diluted to 1 mg / ml with deionized water. Take 50ml of 1mg / ml graphene oxide dispersion, add 1ml of Nafion film solution with a concentration of 5%wt, ultrasonically disperse for 30 minutes, and then magnetically stir in a water bath environment at 60°C for 2h. Subsequently, 0.5 ml of ethylenediamine was added, sealed and kept in an oven at 90° C. for 12 hours to form a graphene hydrogel. The obtained hydrogel was soaked in deionized water, and the water was changed every 6 hours for a total of 5 days before being taken out. Afterwards, the airgel obtained by freeze-drying the hydrogel at -60° C. was annealed in a nitrogen atmosphere at 800° C. for 30 minutes to obtain the product grap...
Embodiment 2
[0039] Graphene oxide was prepared by modified Hummers method using flake graphite as raw material. After the prepared graphene oxide dispersion was centrifuged at a speed of 10,000 rpm for 1 h with a centrifuge, the clear solution in the upper layer was monodisperse few-layer graphene oxide, and diluted to 1 mg / ml with deionized water. Take 50ml of 1mg / ml graphene oxide dispersion, add 2ml of Nafion membrane solution with a concentration of 5%wt, ultrasonically disperse for 30 minutes, and then magnetically stir in a water bath environment at 60°C for 2h. Subsequently, 100 mg of p-phenylenediamine was added, stirred at 60° C. for 10 minutes, sealed, and kept in an oven at 90° C. for 12 hours to form a graphene hydrogel. The obtained hydrogel was soaked in deionized water, and the water was changed every 6 hours for a total of 5 days before being taken out. Afterwards, the airgel obtained by freeze-drying the hydrogel at -60° C. was annealed in a nitrogen atmosphere at 800° C...
Embodiment 3
[0041] Graphene oxide was prepared by modified Hummers method using flake graphite as raw material. After the prepared graphene oxide dispersion was centrifuged at a speed of 10,000 rpm for 1 h with a centrifuge, the clear solution in the upper layer was monodisperse few-layer graphene oxide, and diluted to 1 mg / ml with deionized water. Take 50ml of 1mg / ml graphene oxide dispersion, add 2ml of Nafion membrane solution with a concentration of 5%wt, ultrasonically disperse for 30 minutes, and then magnetically stir in a water bath environment at 80°C for 2h. Subsequently, 1 ml of hydrazine hydrate solution was added, stirred, sealed, and kept in an oven at 90° C. for 12 hours to form a graphene hydrogel. The obtained hydrogel was soaked in deionized water, and the water was changed every 6 hours for a total of 5 days before being taken out. Afterwards, the airgel obtained by freeze-drying the hydrogel at -50° C. was annealed in a nitrogen atmosphere at 800° C. for 30 minutes to...
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