A three-dimensional porous inorganic non-metal element doped graphene airgel composite material and its preparation method and application
A graphene aerogel, inorganic non-metallic technology, applied in the manufacture of hybrid/electric double-layer capacitors, electrical components, hybrid capacitor electrodes, etc., can solve the problems of submerged performance, limited improvement of material performance, lack of functional groups, etc. Good properties, uniform doping, and the effect of preventing graphene agglomeration
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Embodiment 1
[0038] Add 1g of natural graphite flakes and 6g of potassium permanganate into 90mL of concentrated sulfuric acid and 10mL of phosphoric acid mixture, heat with magnetic stirring at 50°C for 12 hours, wait for the reaction to cool to room temperature, slowly add 200mL of ice water and stir for several minutes, then add an appropriate amount of 30% Hydrogen peroxide reduces the remaining oxidant until the mixed solution is bright yellow and no bubbles are generated, then centrifuges and washes with 5% hydrochloric acid, ethanol, and deionized water until neutral, and the resulting solution is dried in a vacuum oven at 60°C for 12 hours to obtain graphite oxide .
Embodiment 2
[0040] Take an appropriate amount of graphite oxide prepared in Example 1 and disperse it in distilled water (2 mg / mL), and process it ultrasonically to obtain an aqueous solution of graphene oxide, which is then added to the lining of a 50 mL reactor. Put the reactor into an oven and react at 180°C for 12h. After the reaction, the obtained hydrogel is washed several times with ethanol and distilled water in sequence, and finally freeze-dried to obtain the three-dimensional graphene airgel. Tested at a current density of 1A / g, its specific capacitance is about 200F / g.
Embodiment 3
[0042] Get an appropriate amount of graphite oxide prepared in Example 1 and disperse it in distilled water, sonicate it to obtain an aqueous solution of graphene oxide and add it to a 50mL reaction kettle liner (without a lid); get 0.96g of boric acid and dissolve it in 20mL of water, and Add it into the 200mL reactor; then place the 50mL reactor lining in the 200mL reactor lining, cover the 200mL reactor lining cover and put it into the 200mL reactor as a whole. Put the reactor into an oven and react at 180°C for 12h. After the reaction, the obtained hydrogel is washed several times with ethanol and distilled water in sequence, and finally freeze-dried to obtain a three-dimensional porous boron-doped graphene airgel. Tested at a current density of 1A / g, its specific capacitance is about 246F / g.
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