Nitrogen-doped carbon-coated graphene oxide two-dimensional porous composite material and preparation method thereof
A porous composite material, nitrogen-doped carbon technology, applied in carbon compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of high price of single-layer graphene, difficulty in maintaining graphene sheet structure and porous structure, and extensive limitations Use and other issues
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[0022] refer to figure 1 The flow chart of the preparation process is shown to illustrate the method of the present invention in detail.
[0023] Firstly, the graphene oxide is prepared by using graphite powder as a raw material. Wherein the graphite powder is selected from one or more mixtures of flake graphite, expandable graphite, expanded graphite, highly oriented graphite and pyrolysis graphite. The method for preparing graphene oxide is the improved Hummers method, see the example part for details. Then the graphene oxide is dispersed in water to obtain a solution, the concentration of which can be adjusted as required. In a preferred embodiment, the content of graphene oxide in the solution is 0.1-1.5 mg / mL.
[0024] Then, adding monosaccharides, disaccharides or soluble polysaccharides into the solution, and adding organic amines, stirring until evenly dispersed, to obtain a hydrothermal reaction mother liquid. Wherein the monosaccharide is selected from any one or...
Embodiment 1
[0031] 1a. Prepare graphene oxide by the improved Hummers method: transfer 1 g of natural graphite (50 mesh) to a round bottom flask, add 23 mL of 98% sulfuric acid, stir at room temperature for 8 h, the temperature is generally controlled at about 25 °C, and magnetically stirred. Gradually add 3 g KMnO to the flask 4 , ice bath, the solution turned dark green, then changed to an oil bath, and the temperature was raised to 35-40 °C. Stir the reaction for 30 minutes, heat up to 70°C, keep the temperature for 45 minutes, the product becomes muddy, dark brown, stir it manually 3-5 times, add 3mL of water, heat up to 100-105°C, keep the temperature for 5min, then add 3mL of water, keep the temperature for 5min, Finally, 3mL of water was added, and the temperature was kept in an oil bath higher than 100°C for 15min. Add 140mL of water (dilute and cool the system to 50°C), while the system is still under stirring. Add 10mL30%H 2 o 2Oxidation, react for 5 minutes. Finally, centr...
Embodiment 2
[0040] 2a: See step 1a in Experimental Example 1.
[0041] 2b: Take 8mL of graphene oxide solution, 4g of glucose and 1mL of ethylenediamine, add 31mL of water, stir well until evenly dispersed.
[0042] 2c: Transfer the solution in b2 to a closed hydrothermal reaction kettle, raise the temperature to 200° C., and react for 10 hours. After cooling, washing with water and ethanol three times respectively, and drying, the nitrogen-doped carbon-coated graphene oxide two-dimensional composite material can be prepared.
[0043] 2d: Mix and grind the product obtained in c2 with KOH at a mass ratio of 1:1, react at 600°C for 2 hours, and wash the product with water and ethanol three times after cooling to obtain nitrogen-doped carbon-coated graphene oxide 2 porous composite materials.
[0044] The nitrogen-doped carbon-coated graphene oxide two-dimensional porous composite material prepared in this example was used for the preparation of the negative electrode sheet. For the steps,...
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