Preparation method for graphene with three-dimensional porous structure
A three-dimensional porous and graphene technology, applied in the field of materials, can solve the problems of low Coulombic efficiency, fast attenuation, and low specific surface area, and achieve the effect of firm pore structure, avoiding toxic chemical reagents and graphene agglomeration, and simple steps
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[0025] Example 1
[0026] (1) First, use the modified Hummers method to prepare graphite oxide; then add 90mL of deionized water and 9mL of styrene monomer to a three-necked flask, continue to pass nitrogen to remove the air in the solution, and magnetically stir for 30min; gradually increase the temperature to 70 ℃, add 10mL of 0.03g / mL potassium persulfate; continue the reaction for 24h, centrifuge and dry to obtain polystyrene pellets;
[0027] (2) The graphite oxide prepared above was ultrasonically peeled into graphene oxide at room temperature, and the concentration was 5g / L. Polystyrene beads and graphene oxide were added to the above solution at a mass of 3:1 and mixed with ultrasonic for 2h to form colloidal particles. , Adjust the pH=8, the polystyrene nanospheres are uniformly dispersed in the graphene oxide, after suction filtration and drying, the polystyrene pellets are calcined at a high temperature in a nitrogen environment and the graphene oxide is thermally reduc...
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[0028] Example 2
[0029] The template without polystyrene beads was used as a comparative test, and graphene was prepared by the thermal reduction method using the same steps. First, the modified Hummers method was used to prepare graphite oxide, and then the graphite oxide was ultrasonically stripped into graphene oxide at room temperature with a concentration of 5g / L, and then ultrasonicated for 2h to adjust pH=8. After suction filtration and drying, it is calcined at high temperature in a nitrogen environment, and the graphene oxide is thermally reduced to obtain graphene.
[0030] In the experiment, we compared the effects of no template method and template method on the specific surface area, pore size and specific capacitance of graphene. We found that after using the template method, the specific surface area and specific capacitance of graphene were significantly increased, and the average pore size distribution also occurred. Has changed a lot.
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