Graphene-based hierarchical pore capacitor carbon and preparation method thereof as well as capacitor

[0045] Graphene-like substances can be prepared by the following methods, but are not limited to the following methods:

[0046] Prepare the cellulose first:

[0047] (1) After the wheat straw is pulverized and pretreated, use the organic acid solution whose total acid concentration is 80wt% formic acid and acetic acid to cook the treated wheat straw, the quality of acetic acid and formic acid in the organic acid solution of the present embodiment Ratio is 1:12, and before adding raw material, add the hydrogen peroxide (H 2 o 2 ) as a catalyst, control the reaction temperature at 120°C, react for 30min, and have a solid-liquid mass ratio of 1:10, and carry out the first solid-liquid separation of the obtained reaction solution;

[0048] (2) the solid that solid-liquid separation obtains for the first time is added the organic acid liquid that total acid concentration is 75wt% formic acid and acetic acid to carry out acid washing, wherein the organic acid solution that above-men

[0064] A preparation method of a three-dimensional graphene-based capacitor carbon with a hierarchical pore structure, comprising the steps of:

[0065] (1) 1g of graphene A is dissolved in water, and ultrasonically obtains a uniformly dispersed graphene aqueous solution;

[0066] (2) Add 25g of soluble starch, stir, and sonicate to obtain a mixed and uniform solution;

[0067] (3) Add the above mixed solution into the high-pressure polytetrafluoroethylene hydrothermal reaction kettle, set the temperature to 160°C for reaction, and gradually add 5g of hexamethylenediamine when the temperature reaches 160°C, and start stirring, and then turn off the stirring after completion, Hydrothermal reaction for 6 hours; natural cooling to room temperature, suction filtration and washing of the solid-liquid mixture in the reactor to obtain multidimensional graphene-based capacitor carbon;

[0068] (4) Mix the multi-dimensional graphene-based capacitor carbon with 80gKOH evenly, and activate

[0071] The difference from Example 1 is that the graphene-like substance is graphene oxide A.