54results about How to "High nitrogen doping" patented technology

The invention discloses a method for preparing nitrogen doped graphene aerogel through the modification of a plant extract. The method comprises the following steps: taking 1 to 10 parts of a graphene oxide solution, 0.5 to 12 parts of a nitrogen source, and 1 to 30 parts of a plant extract in parts by volume, stirring, and performing ultrasonic dispersion, so as to obtain a mixed liquor; shifting the mixed liquor into a high pressure reaction vessel, and ensuring that the mixed liquor is reacted for 12 to 20h at 80 to 200 DEG, so as to obtain hydrogel; percooling the hydrogel for 1 to 12h at 0 to 20 DEG C after the hydrogel is dialysed, and taking out and naturally drying the hydrogel, so as to obtain the nitrogen doped graphene aerogel. The graphene aerogel prepared through the method has high nitrogen doping content, lays a foundation for the preparation of various nitrogen doped graphene-based function materials, and can be used for preparing various microswitches, micro sensors, supercapacitors, lithium batteries, solar batteries, refractory materials, catalytic materials, adsorption materials and oil absorption materials. The preparation method is simple in technology and convenient to operate, and can realize large-scale production.

The invention discloses a preparation method of a high-efficiency nitrogen-doped carbon nanotube. The preparation method comprises the following steps: adding a multiwalled carbon nanotube into a nitric acid solution; closing the solution in an autoclave; pressurizing to 0.4 to 1.0 MPa, and stirring; then heating to 120 to 200 DEG C and keeping for 1 to 4 hours; finally, cooling to room temperature by the autoclave; washing to neutral and carrying out suction filtration and drying; mixing the carbon nanotube with a melamine solid according to the mass ratio being 1 to (1 to 4), and uniformly grinding by using mortar; and carrying out high-temperature sintering in nitrogen, washing to neutral and then drying to obtain the nitrogen-doped carbon nanotube. The nitrogen doping amount of the high-efficiency nitrogen-doped carbon nanotube disclosed by the invention is 4.6 to 10.3 weight percent.

The invention discloses a preparation method of nitrogen-doped carbon aerogel applied to a lithium-ion battery. The method comprises the steps of firstly, adding taken resorcinol and melamine to an NaOH water solution with the concentration of 1.2g/L, stirring and transferring the mixed solution to a sealed container for gelatinization and ageing to obtain wet gel, soaking the wet gel into acetone for solvent replacement and then drying to obtain aerogel; and putting the aerogel into a tube furnace for carbonization to obtain the nitrogen-doped carbon aerogel. The nitrogen-doped carbon aerogel by employing the melamine as a nitrogen source and resorcinol-melamine-formaldehyde as a carbon source is formed by doping nitrogen into a carbon material, has hierarchical pore distribution and has high energy density and power density when used for a negative electrode of the lithium-ion battery.

The invention discloses a preparation method of nitrogen-doped graphene. The preparation method is realized through the following process: weighing melamine and dextrose monohydrate according to a certain mass ratio, grinding for 30min in an agate mortar; placing the mixture in a horizontal quartz tube furnace heating area, introducing argon in a certain flow as protective gas, raising the temperature in a furnace chamber to 450 DEG C in a certain rising rate, and carrying out heat preservation for 90min, raising the temperature in the furnace chamber to a certain temperature in the same rising rate, and carrying out heat preservation for 60min; after the reaction is finished, taking out the product when the temperature in the furnace chamber naturally cools to the room temperature, wherein the product is the nitrogen-doped graphene. The preparation method disclosed by the invention has the characteristics of easily available raw material, low cost, simple preparation process, clean and environment-friendly synthesis path, no pollution, and high nitrogen doping amount; the preparation method has popularization and application value.

The invention relates to a method for preparing a nitrogen-doped carbon material from biomass. The method comprises the following steps: crushing biomass into fine particles; uniformly mixing the crushed biomass particles with an acidic ammonium salt solution according to a certain ratio to form a mixture; putting the mixture into a hydrothermal reaction kettle, and carrying out a hydrothermal reaction under a certain temperature condition; dehydrating and drying hydrothermal carbon obtained after the hydrothermal reaction; and putting the dried hydrothermal carbon into a pyrolyzing furnace, and carrying out rapid pyrolysis under the protection of an inert atmosphere under a certain temperature condition to obtain a nitrogen-doped carbon material subjected to rapid pyrolysis. According tothe invention, the raw material adopted by the method is renewable energy, covers all biomass raw materials, and has the advantages of rich reserves, low cost and environmental protection compared with coal as a raw material for preparing the activated carbon.

The invention relates to a preparation method and application of carbon-nitrogen doped ternary metal oxides. The preparation method includes the steps of S1, synthesizing a Zn-IM framework material coordinated by zinc and 2-methylimidazole; S2, weighing the Zn-IM framework material and cobalt nitrate hexahydrate, and dispersing the Zn-IM framework material and the cobalt nitrate hexahydrate into a solvent for microwave reaction to obtain a coordinated Co-Zn-IM framework material; S3, weighing the coordinated Co-Zn-IM framework material, sodium dodecyl sulfate, hexadecyl trimethyl ammonium bromide and copper chloride dihydrate, and dispersing the above materials into a solvent for microwave reaction to obtain a coordinated trimetallic heterozygous Cu-Co-Zn-IM framework material; S4, roasting the coordinated trimetallic heterozygous Cu-Co-Zn-IM framework material prepared in the step S3 so as to obtain the carbon-nitrogen doped ternary metal oxides. The preparation method has the advantages that with the 2-methylimidazole serving as a ligand, highly nitrogen-doped metal oxides can be obtained, and accordingly the prepared carbon-nitrogen doped ternary metal oxides are high in electrochemical stability and specific capacity and can act as an anode material of lithium ion batteries to improve the specific capacity of the lithium ion batteries.

The invention provides a solvent-heat preparing method of N-doped TiO2, comprising: adding TiO2 into the solvent of N-containing organic alkali and water or alcohol, ultrasonic vibrating, pouring the mixture into a corrosion-resistant stainless steel hydrothermal reactor at room temperature, raising temperature to make solvent heat reaction, filtering, washing and drying and making it. And the invention overcomes the aggregation growth in the high temperature gas-phase reacting course, directly adopts TiO2 to one-step synthesize it by simple solvent heat synthesis process. And it has good dispersivity, small and uniform particles, high nitrogen doping quantity, high catalytic activity in the sun, etc.

The invention discloses a preparation method and application of a nitrogen-doped porous carbon fiber and belongs to the technical field of preparation of porous carbon fiber materials. The preparationmethod comprises the following steps of firstly, preparing a polyacrylonitrile/polyvinylpyrrolidone spinning precursor solution, then obtaining a porous polyacrylonitrile fiber through a wet spinningmethod by utilizing different solubilities (phase separation) of the polyacrylonitrile and the polyvinylpyrrolidone in an aqueous solution, soaking and activating the obtained porous polyacrylonitrile fiber in a potassium hydroxide solution, taking the polyacrylonitrile as a carbon source and a nitrogen source, and carrying out one-step high-temperature carbonization activation treatment in an inert atmosphere to obtain the nitrogen-doped porous carbon fiber. The porous carbon fiber material has a hierarchical porous carbon skeleton structure with high specific surface area, high nitrogen content and mutual crosslinking, a fast channel is provided for electron transmission, the ion diffusion distance is shortened, the wettability and conductivity of the material are increased, and good electrochemical performance is shown. The preparation process is simple, the equipment dependence is low, and the method is suitable for large-scale industrial production.

The invention discloses a high-capacitance polyindole nitrogen-doped porous carbon material and a preparation method thereof, and belongs to the technical field of processing of a carbon material. The high-capacitance polyindole nitrogen-doped porous carbon material comprises the following constituents based on parts by weight: 10-30 parts of indole compound, 30-90 parts of oxidizing agent, 60-180 parts of activating agent and 300-1,000 parts of solvent. The nitrogen-doped porous carbon material provided by the invention has the characteristics of relatively high nitrogen-doped quantity, large-pore diameter distribution, high charge-discharge stability, high-rate performance and high specific capacitance value.

The invention discloses a method for preparing nitrogen-doped graphene by treating carbonate by shock waves and belongs to the technical field of processes. The method comprises the following steps: uniformly mixing a carbon source, a reducing agent and a nitrogen source and compacting to obtain an initial blank; colliding a sample box by using a flyer to induce chemical reaction to obtain powder; putting the powder into a reactor, adding concentrated nitric acid for purification, reacting and filtering and washing to obtain a solid a; and drying to obtain the nitrogen-doped graphene. The number of molecular layers of the nitrogen-doped graphene is 1-6, and the nitrogen doping content is high, so that the nitrogen-doped graphene has good oxygen reduction catalytic activity. The method is low in cost, short in production period, simple in process and low in requirements on production conditions, hardly causes dangers in the production process and can be put into industrial production conveniently.

The invention belongs to the field of battery materials, and particularly discloses a nitrogen-doped expanded graphite paper current collector, which comprises expanded graphite paper and a nitrogen-doped amorphous carbon material compounded on the surface of the expanded graphite paper in situ. The invention further discloses a preparation method for the current collector. The graphite paper is infiltrated with ionic liquid, the graphite paper infiltrated with the ionic liquid is subjected to heat preservation for 5 min to 8 h at the temperature of 400 DEG C to 1000 DEG C in the air atmosphere, and the current collector is obtained. The invention also discloses the application of the current collector in preparation of a positive electrode, a battery, especially a lithium-sulfur battery.According to the preparation method for the carbon-based current collector provided by the invention, one-step treatment of nitrogen doping and expansion of the graphite paper is realized, the nitrogen doping improves the conductivity of the graphite paper, the expansion realizes the infiltration of the graphite paper by the electrolyte, buffer space is provided for the volume change of the activematerial in the charging and discharging process, and meanwhile, the active material is restrained between the layers of the expanded graphite paper, so that the active material can be prevented fromfalling off from the current collector, and the stability of the electrode is improved.

The invention relates to a preparation method of an improved type graded porous carbon-doped material. The method mainly overcomes the shortcomings of complex technology, long production cycle, relatively low efficiency, much wastewater discharge, relatively high cost and the like of CN105480963A, abandons original steps such as deionized water purifying and balancing treatment and soaking treatment in an acid solution, and adopts a process of directly freeze-drying the prepared hydrogel and performing high-temperature carbonization and then washing and drying to obtain a target product. Compared with the prior art, in particular to the CN105480963A, the graded porous carbon-doped material prepared by the method provided by the invention has the advantages of more abundant doping atoms, more porous structures on the surface and more excellent electrical properties.

The invention provides nitrogen-doped biochar which is simple in production process and low in green cost, and the nitrogen-doped biochar is applied to the process of improving the dark fermentation hydrogen production performance for the first time. The nitrogen-doped biochar material takes corncob powder and melamine as raw materials; the high-nitrogen-doped biochar material is finally obtainedthrough high-pressure and high-temperature cooking, activator dipping, nitrogen atmosphere carbonization, washing and drying, and the bottleneck that in the prior art, the nitrogen-doped biochar material preparation process is low in nitrogen content, high in cost and complex in process, and dark fermentation hydrogen production efficiency is low is overcome.

The invention relates to preparation and application of a hydrophobic Schiff base cobalt-coated beta cyclodextrin-graphene porous carbon composite material. The method comprises the following steps: synthesizing a hydrophobic 5-chlorosalicylaldehyde dicyandiamide Schiff base cobalt metal complex by adopting a homogeneous reaction kettle and an alcohol-thermal method, then forming an inclusion compound with hydrophobic beta-cyclodextrin, stably crosslinking with graphene oxide, and finally filtering, washing, drying, calcining at high temperature and the like. The material has the following advantages that the 5-chlorosalicylaldehyde dicyandiamide schiff base cobalt metal complex has a hydrophobic structure, and reaction basic conditions are provided for successful embedding of beta-cyclodextrin with an internal hydrophobic and external hydrophilic structure; a solvothermal method and a carbonization method are adopted, so that the process is simple and environment-friendly; the water/alcohol medium system enhances the dispersity of the material. When the material is used as a supercapacitor electrode material, the material is charged and discharged in a range of 0-0.4 V, the specific capacitance can reach 500-1000F/g when the discharge current density is 1A/g, and the material has excellent electrochemical characteristics and chemical stability.

The invention provides a preparation method of graphene. The preparation method comprises the following step: carbonizing an organic matter containing carbon and nitrogen to obtain graphene. The organic matter containing carbon and nitrogen is prepared by the following step: mixing a nitrogen-containing phenanthrene compound with an organic matter to obtain the organic matter containing carbon andnitrogen; the nitrogen-containing phenanthrene compound has the structure of formula I as shown in the specification, wherein R1-R8 are independently selected from alkyl, aromatic or alkoxy groups with the number of each of hydrogen atom and carbon atom being 1-12; m is equal to 0 or 1; n is equal to 0 or 1; and the organic matter is selected from one or more of vitamin, cyanamide, amino acid andnitrogen-containing dye. In the invention, a nitrogen-doped graphene material is prepared by direct carbonization of the organic matter containing carbon and nitrogen in one step, no step of removinga metal catalyst or transferring is required, the preparation process is simple and easy to operate, and the cost is saved. The invention also provides the graphene and an electrode material.

The invention relates to a method for preparing a nitrogen-doped carbon material from fluorine-containing macromolecules, which comprises the following steps: putting a fluorine-containing macromolecule precursor material in an ammonia atmosphere, and calcining at 360-1200 DEG C to obtain the nitrogen-doped carbon material, wherein the fluorine-containing polymer precursor material is a polymer of which the relative molecular mass is 1,000 to 10,000,000 and part of hydrogen is substituted by fluorine. In this way, the nitrogen-doped carbon material can be obtained at a low temperature, and due to the fact that electron exchange of fluorine and nitrogen species can greatly promote doping of the nitrogen element, the nitrogen content of the nitrogen-doped carbon material obtained through the method can reach 10% or above. Besides, controllable doping of the nitrogen content and type on the conductive carbon felt can be realized by regulating and controlling the reaction temperature.

The invention belongs to the technical field of porous carbon materials, and discloses a nitrogen-doped porous carbon material as well as a preparation method and application thereof. The method comprises the following steps: 1) in a mixed solvent containing water, mixing a triblock copolymer F127, an organic nitrogen source, magnesium chloride and potassium ferrate, adding agarose, uniformly mixing the components, cooling the mixture to form hydrogel, and freeze-drying the hydrogel to obtain dry gel; 2) carbonizing the dry gel to obtain a nitrogen-doped porous carbon material, wherein the carbonization treatment is to carbonize the dry gel at the temperature of 800-900 DEG C; or the carbonization treatment is that the xerogel is subjected to primary carbonization, acid treatment and secondary carbonization. The method is simple, and the obtained nitrogen-doped porous carbon material has a large specific surface area, a large number of defect sites, a high nitrogen doping amount and excellent oxygen reduction performance. The invention also discloses the application of the nitrogen-doped porous carbon material in electrocatalytic oxygen reduction reaction as an oxygen reduction reaction electrocatalyst.