A kind of high volume specific capacitance graphene and preparation method thereof
A graphene and specific capacitance technology, applied in graphene, nano-carbon and other directions, can solve the problems of graphene's small size and inability to apply large-capacity supercapacitors and other electrical devices, and achieve high volume specific capacitance, improved energy density, The effect of increasing the volume specific capacitance
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Embodiment 1
[0063] A preparation method for high volume ratio capacitance graphene, comprising the steps of:
[0064] (1) Take graphite oxide prepared by Hummers method, and obtain graphene oxide powder after microwave exfoliation;
[0065] (2) Weigh 3g of graphene oxide powder obtained in step (1), 0.5g of charcoal, 15g of KOH, fully mix, stir and dry;
[0066] (3) Place the mixture obtained in step (2) in a vacuum tube furnace. After removing the air in the furnace, feed argon gas with a purity of 99.99% into the vacuum tube furnace at a flow rate of 100 sccm, and react at 800°C for 1.5 h;
[0067] (4) After the reaction is completed, the temperature is naturally lowered to room temperature, washed, and dried to obtain a high specific surface graphene material with increased volume specific capacitance. figure 1 It is a schematic diagram of the preparation process of high volume ratio capacitance graphene described in embodiment 1;
[0068] The specific surface area of the prepared...
Embodiment 2
[0074] A preparation method for high volume ratio capacitance graphene, comprising the steps of:
[0075] (1) Take graphite oxide prepared by Hummers method, and obtain graphene oxide powder after microwave exfoliation;
[0076] (2) Weigh 3g of graphene oxide powder obtained in step (1), 1g of sawdust, 18g of KOH, fully mix, stir and dry;
[0077] (3) Place the mixture obtained in step (2) in a vacuum tube furnace, and after removing the air in the furnace, feed argon gas with a purity of 99.99% into the vacuum tube furnace at a flow rate of 120 sccm, and react at 900°C for 1 hour ;
[0078] (4) After the reaction is completed, the temperature is naturally lowered to room temperature, washed, and dried to obtain a high specific surface graphene material with increased volume specific capacitance.
[0079] The specific surface area of the prepared graphene material is 1996.9m 2 / g (measurement method is the same as Example 1).
[0080] Performance Testing:
[0081] Test ...
Embodiment 3
[0083] A preparation method for high volume ratio capacitance graphene, comprising the steps of:
[0084] (1) Take graphite oxide prepared by Hummers method, and obtain graphene oxide powder after microwave exfoliation;
[0085] (2) Weigh 3g of graphene oxide powder obtained in step (1), 1g of petroleum coke, 15g of KOH, fully mix, stir and dry;
[0086] (3) Place the mixture obtained in step (2) in a vacuum tube furnace, and after removing the air in the furnace, feed argon gas with a purity of 99.99% into the vacuum tube furnace at a flow rate of 60 sccm, and react at 1200°C for 0.5 h;
[0087] (4) After the reaction is completed, the temperature is naturally lowered to room temperature, washed, and dried to obtain a high specific surface graphene material with increased volume specific capacitance.
[0088] The specific surface area of the prepared graphene material is 2150.2m 2 / g (measurement method is the same as Example 1).
[0089] Performance Testing:
[0090] ...
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