A kind of preparation method of three-dimensional graphene macrobody
A macroscopic, graphene-based technology, applied in ceramic products, other household appliances, hybrid capacitor electrodes, etc., can solve the problem of reducing the specific surface area of materials, achieve the effect of increasing specific capacity, high conductivity, and improving electrochemical performance
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Embodiment 1
[0035] Take 100ml concentration is 3mg mL -1 Graphene oxide aqueous solution; Press graphene oxide and nickel salt mass ratio 1:30, take by weighing 9g nickel acetate; Press graphene oxide, Zn(NO 3 ) 2 ·6H 2 The mass ratio of O and 2-methylimidazole is 1:30:80, and 9g Zn(NO 3 ) 2 ·6H 2 O and 24g 2-methylimidazole; graphene oxide solution, nickel salt and Zn(NO 3 ) 2 ·6H 2 O was prepared in proportion and then ultrasonically treated for 2h, then added 2-methylimidazole, and stirred for 15min to obtain a mixed solution; then heated at 100°C for 5h to obtain a graphene hydrogel; the obtained graphene hydrogel was subjected to After freeze-drying, the three-dimensional graphene macroscopic body was obtained, and then reacted at 1000 ° C for 5 h under nitrogen atmosphere, and then the reaction product was mixed with 0.1 mol L -1 After immersing in nitric acid for 1-10 hours, it was repeatedly washed with deionized water and dried to obtain a composite macroscopic body of gr...
Embodiment 2
[0038] Take 100ml concentration as 5mg mL -1 Graphene oxide aqueous solution; Press graphene oxide and nickel salt mass ratio 1:10, take by weighing 5g nickel acetate; Press graphene oxide, Zn(NO 3 ) 2 ·6H 2 The mass ratio of O and 2-methylimidazole is 1:50:100, and 25g Zn (NO 3 ) 2 ·6H 2 O and 50g 2-methylimidazole; graphene oxide solution, nickel salt and Zn(NO 3 ) 2 ·6H 2 O was prepared in proportion and then ultrasonically treated for 2 hours, then added 2-methylimidazole, and stirred for 20 minutes to obtain a mixed solution; heated at 80° C. for 0.5 hours to obtain a graphene hydrogel; the obtained graphene hydrogel was subjected to After freeze-drying, the three-dimensional graphene macroscopic body was obtained, and then reacted at 800 ° C for 1 h under nitrogen atmosphere, and then the reaction product was mixed with 0.1 mol L -1After soaking in nitric acid for 8 hours, it was repeatedly washed with deionized water and dried to obtain a composite macroscopic b...
Embodiment 3
[0040] Take 100ml concentration as 0.1mg mL -1 Graphene oxide aqueous solution; by graphene oxide and nickel salt mass ratio 1:50, take by weighing 0.5g nickel acetate; by graphene oxide, Zn(NO 3 ) 2 ·6H 2 The mass ratio of O and 2-methylimidazole is 1:10:20, and 0.1g Zn(NO 3 ) 2 ·6H 2 O and 0.2g 2-methylimidazole; the graphene oxide solution, nickel salt and Zn(NO 3 ) 2 ·6H 2 O was prepared in proportion and then ultrasonically treated for 1 h, then added 2-methylimidazole, and stirred for 15 min to obtain a mixed solution; heated at 120°C for 1 h to obtain a graphene hydrogel; the obtained graphene hydrogel was frozen After drying, the three-dimensional graphene macroscopic body was obtained, and then reacted at 650 ° C for 5 h under nitrogen atmosphere, and then the reaction product was mixed with 0.1 mol L -1 Hydrochloric acid dipping for 7 hours, repeated washing with deionized water, and drying to obtain graphene and carbon nanotube composite macroscopic body.
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