Reduced-oxidized graphene-ferrous silicate-ferroferric oxide sandwich structure composite, preparation method thereof and application
A technology of ferric oxide and ferrous silicate, which is applied in the direction of structural parts, electrochemical generators, nanotechnology for materials and surface science, etc., can solve the problems of poor conductivity of FS and achieve short time consumption and good Effects of cycle stability and excellent rate performance
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Embodiment 1
[0032] RGO-FS-Fe 3 o 4 The preparation method of sandwich structure compound, comprises the following steps:
[0033] 1) Graphene oxide was prepared by the Hummers method with a concentration of 3.5 mg / mL.
[0034] 2) Add 0.1 g of cetyltrimethylammonium bromide into a mixed solution of 120 mL of absolute ethanol and 15 mL of deionized water, and stir for 20 minutes to obtain a clear solution.
[0035] 3) Add 35 mg of graphene oxide and continue stirring for 20 minutes.
[0036] 4) Add 1.5 mL of ammonia water and 1 mL of tetraethylorthosilicate, and stir at a speed of 350 r / min for 6 hours.
[0037] 5) The obtained product was washed three times with water and alcohol respectively, and placed in an oven at 70°C to dry to obtain SiO 2 -GO-SiO 2 Sandwich structure complex.
[0038] 6) Put 0.1g SiO 2 -GO-SiO 2 Add to deionized water and sonicate for 40 minutes.
[0039] 7) Add 0.6 mmol of ferrous sulfate heptahydrate and 3 mmol of sodium acetate trihydrate into deionized ...
Embodiment 2
[0048] RGO-FS-Fe 3 o 4 The preparation method of sandwich structure compound, comprises the following steps:
[0049] 1) Graphene oxide was prepared by the Hummers method with a concentration of 3.5 mg / ml.
[0050] 2) Add 0.2 g of cetyltrimethylammonium bromide into a mixed solution of 120 ml of absolute ethanol and 15 ml of deionized water, and stir for 20 minutes to obtain a clear solution.
[0051] 3) Add 35 mg of graphene oxide and continue stirring for 20 minutes.
[0052] 4) Add 1.5 ml of ammonia water and 1 ml of tetraethyl orthosilicate, and stir at a speed of 350 r / min for 6 hours.
[0053] 5) The obtained product was washed three times with water and alcohol respectively, and placed in an oven at 70°C to dry to obtain SiO 2 -GO-SiO 2 Sandwich structure complex.
[0054] 6) Put 0.1g SiO 2 -GO-SiO 2 Add to deionized water and sonicate for 40 minutes.
[0055] 7) Add 0.6 mmol of ferrous sulfate heptahydrate and 3 mmol of sodium acetate trihydrate into deionized...
Embodiment 3
[0062] RGO-FS-Fe 3 o 4 The preparation method of sandwich structure compound, comprises the following steps:
[0063] 1) Graphene oxide was prepared by the Hummers method with a concentration of 3.5 mg / ml.
[0064] 2) Add 0.1 g of polyvinylpyrrolidone into a mixed solution of 120 ml of absolute ethanol and 15 ml of deionized water, and stir for 20 minutes to obtain a clear solution.
[0065] 3) Add 35 mg of graphene oxide and continue stirring for 20 minutes.
[0066] 4) Add 2 ml of ammonia water and 1 ml of tetraethyl orthosilicate, and stir at a speed of 350 r / min for 6 hours.
[0067] 5) The obtained product was washed three times with water and alcohol respectively, and placed in an oven at 70°C to dry to obtain SiO 2 -GO-SiO 2 Sandwich structure complex.
[0068] 6) Put 0.1g SiO 2 -GO-SiO 2 Add to deionized water and sonicate for 40 minutes.
[0069] 7) Add 0.6 mmol of ferrous sulfate heptahydrate and 3 mmol of sodium acetate trihydrate into deionized water, and ...
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