Preparation method and application of nitrogen-boron co-doped porous activated carbon material
A porous activated carbon and co-doping technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of the influence of pore size distribution on the performance of supercapacitors, and achieve high specific capacitance, large specific surface area, and long-term cycle use. effect of life
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Embodiment 1
[0024] Take 1 g of chitosan, add it to 1 wt% aluminum nitrate aqueous solution, heat and stir at 90 °C to dissolve, and obtain a chitosan solution. Then add 5 g of polyvinyl alcohol, heat and stir at 90°C to dissolve, and obtain a chitosan / polyvinyl alcohol composite solution. Add 0.025 g of boric acid into the chitosan / polyvinyl alcohol composite solution to obtain the chitosan / polyvinyl alcohol composite gel. The chitosan / polyvinyl alcohol composite gel was freeze-dried to obtain a whole piece of solid material, which was put into a tube furnace and carbonized at 600 °C for 4 hours under an argon atmosphere. The carbonized powder was washed in 6 wt% hydrochloric acid solution, washed in absolute ethanol solution, and dried in an oven at 60 °C to constant weight. Then the porous activated carbon material obtained by drying was ground with sodium hydroxide (mass ratio 1:2), dried in vacuum at 60 °C to constant weight, and carbonized in a tube furnace at 600 °C for 2 h. After...
Embodiment 2
[0026] Take 2 g of chitosan, add it to 10 wt% aluminum chloride aqueous solution, heat and stir at 90 °C to dissolve, and obtain a chitosan solution. Then add 8 g of polyvinyl alcohol, heat and stir at 90°C to dissolve, and obtain a chitosan / polyvinyl alcohol composite solution. Add 0.16 g of boric acid into the chitosan / polyvinyl alcohol composite solution to obtain the chitosan / polyvinyl alcohol composite gel. The chitosan / polyvinyl alcohol composite gel was freeze-dried to obtain a whole piece of solid material, which was put into a tube furnace and carbonized at 700 ℃ for 3 h under an argon atmosphere. The carbonized powder was washed in 6 wt% hydrochloric acid solution, washed in absolute ethanol solution, and dried in an oven at 60 °C to constant weight. The porous activated carbon material obtained by drying was ground with sodium hydroxide (mass ratio 1:4), dried in vacuum at 60 °C to constant weight, and carbonized at 800 °C for 1 h in a tube furnace. After taking i...
Embodiment 3
[0028] Take 2 g of chitosan, add it to 10 wt% aluminum nitrate aqueous solution, heat and stir at 90 °C to dissolve, and obtain a chitosan solution. Then add 8 g of polyvinyl alcohol, heat and stir at 90°C to dissolve, and obtain a chitosan / polyvinyl alcohol composite solution. Add 0.08 g boric acid into the chitosan / polyvinyl alcohol composite solution to obtain chitosan / polyvinyl alcohol composite gel. The chitosan / polyvinyl alcohol composite gel was freeze-dried to obtain a whole solid, which was put into a tube furnace and carbonized at 800 ℃ for 3 h under an argon atmosphere. The carbonized powder was washed in 6 wt% hydrochloric acid solution, washed in absolute ethanol solution, and dried in an oven at 60 °C to constant weight. Then the porous activated carbon material obtained by drying was ground with potassium hydroxide (mass ratio 1:2), dried in vacuum at 60 °C to constant weight, and carbonized at 600 °C in a tube furnace for 1 h. After taking it out, wash it rep...
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