A kind of preparation method of porous carbon network based on graphene
A technology of graphene and porous carbon, which is applied in the field of preparation of porous carbon network, can solve the problems such as difficult to use high specific surface area of graphene, and achieve the effect of low density, good stability and high specific surface area
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Embodiment 1
[0019] (1) drying the mixed dispersion liquid of monolayer graphene oxide and potassium hydroxide by atomization drying method, wherein, the mass ratio of potassium hydroxide and graphene oxide is 0.1:1, obtains graphene oxide microsphere, atomization The temperature is 130°C;
[0020] (2) Mix the graphene oxide microspheres obtained in step (1) with coconut shells and potassium hydroxide in a mass ratio of 100:10:100, grind them to 300-400 mesh, and transfer them to a mold with a filling rate of 90 %;
[0021] (3) After the mold is sealed, the mixture therein is carbonized at 500° C. for 2 hours, activated at 800° C. for 2 hours, and washed to obtain a porous carbon network.
[0022] Through the above steps, a graphene-based porous carbon network is obtained, which is a black fluffy block. The density is 0.17g / cm 3 , the specific surface area is 1840m 2 / g, the pore volume is 1.75cm 3 / g.
Embodiment 2
[0024] (1) drying the mixed dispersion liquid of monolayer graphene oxide and potassium hydroxide by atomization drying method, wherein, the mass ratio of potassium hydroxide and graphene oxide is 1:1, obtains graphene oxide microsphere, atomization The temperature is 130°C;
[0025] (2) Mix the graphene oxide microspheres obtained in step (1) with coconut shells and potassium hydroxide in a mass ratio of 100:10:100, grind them to 300-400 mesh, and transfer them to a mold with a filling rate of 90 %;
[0026] (3) After the mold is sealed, the mixture therein is carbonized at 500° C. for 2 hours, activated at 800° C. for 2 hours, and washed to obtain a porous carbon network.
[0027] Through the above steps, a graphene-based porous carbon network is obtained, which is a black fluffy block. The density is 0.14g / cm 3 , the specific surface area is 2030m 2 / g, the pore volume is 2.28cm 3 / g.
Embodiment 3
[0029] (1) drying the monolayer graphene oxide dispersion by atomization drying method to obtain graphene oxide microspheres, the atomization temperature is 130°C;
[0030] (2) Mix the graphene oxide microspheres obtained in step (1) with coconut shells and potassium hydroxide in a mass ratio of 100:120:200, grind them to 300-400 mesh, and transfer them to a mold with a filling rate of 90 %;
[0031] (3) After the mold is sealed, the mixture therein is carbonized at 300° C. for 6 hours, activated at 800° C. for 2 hours, and washed to obtain a porous carbon network.
[0032] Through the above steps, a graphene-based porous carbon network is obtained, which is a black fluffy block. The density is 0.37g / cm 3 , the specific surface area is 1510m 2 / g, the pore volume is 1.24cm 3 / g.
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