Nitrogen-doped biochar, preparation method and application, electrode and preparation method
A technology of nitrogen doping and biochar, applied in the field of capacitors, can solve the problem that the difference in sludge properties cannot effectively control the quality of nitrogen-containing carbon materials, the production process of two-dimensional graphene oxide is complex, and the physical and chemical properties of nitrogen-doped carbon materials can be reduced. problems, to achieve the effect of improving buffer storage and rapid transport of ions, enhancing electrochemical performance, and improving electrical conductivity
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[0029] A method for preparing nitrogen-doped biochar, comprising the following steps:
[0030] 1) Preparation of nitrogen-rich water phase: put a certain proportion of algae biomass, reaction additives and deionized water into the reactor for hydrothermal reaction, remove solid particles and bio-oil in the product after the reaction, and obtain nitrogen-rich water phase ;
[0031] 2) Preparation of nitrogen-doped biocoke: Put the nitrogen-rich aqueous phase and terrestrial biomass into a reactor for hydrothermal reaction. After the reaction, take out the solid product in the reactor and wash off the organic matter on the surface to obtain nitrogen-doped biocoke. Miscellaneous biochar;
[0032] 3) Activation of nitrogen-doped biocoke: fully mix nitrogen-doped biocoke with a certain proportion of activator, and activate under the protection of inert gas, and obtain nitrogen-doped biochar after the activation reaction is completed;
[0033] 4) Treatment of nitrogen-doped biocha...
Embodiment 1
[0051] 1.1 Preparation of nitrogen-doped biochar
[0052] 1) Preparation of nitrogen-enriched aqueous phase: add 2g of Enteromorpha to 40mL of deionized water without adding reaction additives, and react in a hydrothermal reactor at a reaction temperature of 195°C, a heating rate of 3.5°C / min, and a reaction time of 0.5h , solid-liquid separation to obtain filtrate, i.e. nitrogen-enriched aqueous phase;
[0053] 2) Preparation of nitrogen-containing carbon products: In a hydrothermal reaction kettle, add 40ml of filtrate and 1g of bamboo powder at the same time, carry out hydrothermal reaction at 175°C, and the reaction time is 1.5h; after the reaction, the hydrothermal reaction product is pumped Filtration, washing with methylene chloride, suction filtration, ethanol washing, suction filtration, deionized water washing, and suction filtration; the treated product was vacuum-dried at 105°C for 8 hours to obtain nitrogen-doped biocoke;
[0054] 3) Activation of nitrogen-doped ...
Embodiment 2
[0060] 2.1 Preparation of nitrogen-doped biochar
[0061] 1) Preparation of nitrogen-rich aqueous phase: add 4g of Sargassum to 40mL of deionized water, add 5% sodium bicarbonate as a reaction additive, and react in a hydrothermal reaction kettle with a reaction temperature of 225°C and a heating rate of 5°C / min. The reaction time is 2.3 hours, and the filtrate is obtained by solid-liquid separation, that is, the nitrogen-rich aqueous phase;
[0062] 2) Preparation of nitrogen-containing carbon products: In a hydrothermal reaction kettle, add 40ml of filtrate and 3.5g of rice husk powder at the same time, carry out hydrothermal reaction at 215°C, and the reaction time is 2.4h; The product was filtered with suction, washed with methylene chloride, filtered with suction, washed with ethanol, filtered with suction, washed with deionized water, and filtered with suction; the processed product was vacuum-dried at 105°C for 8 hours to obtain nitrogen-doped biocoke;
[0063] 3) Acti...
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