A kind of preparation method of graphene composite petroleum coke-based activated carbon and super capacitor
A graphene composite, activated carbon technology, applied in hybrid capacitor electrodes, chemical instruments and methods, carbon compounds, etc., can solve the problems of unstable specific surface area, poor reproducibility, and poor graphene dispersion.
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[0045] The invention provides a preparation method of graphene composite petroleum coke-based activated carbon, comprising the following steps:
[0046] A) after the petroleum coke particles are coked under the condition of the first gas, obtain pre-carbonized petroleum coke;
[0047] B) after the pre-carbonized petroleum coke obtained in the above steps is mixed with the activator, activate under the condition of the third gas, and then obtain the activated carbon dispersion after washing;
[0048] C) after the activated carbon dispersion liquid, graphene oxide solution and reducing agent obtained in the above steps are mixed and chemically reduced, a semi-finished product is obtained;
[0049] D) drying the semi-finished product obtained in the above-mentioned steps after etching with hydrogen peroxide, and then performing heat treatment under the condition of protective gas to obtain graphene composite petroleum coke-based activated carbon.
[0050] In the present inventio...
Embodiment 2
[0105] Take 100 g of needle-shaped petroleum coke and pulverize it into particles of 8-12 microns, treat at 500° C. for 1 hour in a nitrogen atmosphere, and cool naturally to obtain pre-carbonized petroleum coke.
[0106] Add 250g of powdered KOH and mix them uniformly, add this mixture into a metal nickel crucible, and heat it up to 450°C at a rate of 10-20°C / min under a nitrogen atmosphere and keep it for 3h; then heat it up to a rate of 10-20°C / min Activated at 750 °C for 1 h, and then cooled to room temperature naturally. The product was dissolved in water, washed repeatedly until neutral, then added 6M hydrochloric acid to reflux for 2 h, filtered, and washed with deionized water until neutral. Deionized water was added to prepare a 0.1 g / ml water dispersion to obtain an activated carbon dispersion.
[0107] A monolayer graphene oxide solution with a solid content of 0.2 g was added to the dispersion, ultrasonically stirred for 1 h, then adjusted to pH 10.5 with ammonia wa...
Embodiment 3
[0116] Take 100 g of needle-shaped petroleum coke and pulverize it into particles of 10-15 microns, and treat at 400° C. for 2 hours in an argon atmosphere to obtain pre-carbonized petroleum coke.
[0117] Add 400g of powdered KOH and mix them uniformly. Add this mixture to a metal nickel crucible, and in a nitrogen atmosphere, the temperature is raised to 500°C at a rate of 10-20°C / min and maintained for 2 hours; then the temperature is raised to a rate of 10-20°C / min Activated at 850 °C for 1 h, and then cooled to room temperature naturally. The product was dissolved in water, washed repeatedly until neutral, then added 6M hydrochloric acid to reflux for 2 h, filtered, and washed with deionized water until neutral. Deionized water was added to prepare a 0.05 g / ml water dispersion to obtain an activated carbon dispersion.
[0118] A single-layer graphene oxide solution with a solid content of 0.3 g was added to the dispersion, ultrasonically stirred for 1 h, then adjusted to...
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