340 results about "Doped carbon" patented technology

The invention discloses a synthesis method and application of nitrogen-doped carbon-coated Co porous spheres, cobalt nitrate hexahydrate and 4-picolinic acid are dissolved in a mixed solution, the mixed solution comprises dimethylformamide and absolute ethyl alcohol, then the mixed solution is transferred into a reaction kettle for heating reaction, and after the reaction is finished, centrifugal drying is performed to obtain a Co coordination compound precursor; and calcining the precursor in an argon hydrogen atmosphere, and selecting and setting a proper heating rate, a proper calcining temperature and a proper calcining time to obtain the nitrogen-doped carbon-coated Co porous ball. The obtained nitrogen-doped carbon-coated Co porous ball is used as the air cathode of the zinc-air battery, so that high power density and excellent charge-discharge cycle stability are realized.

The application provides a Sn-doped Fe-N-C catalyst, a preparation method and application thereof. The catalyst comprises a carrier and Sn atoms and Fe atoms supported on the carrier, and the carrier is an N-doped carbon material. The application dopes the p-block metal Sn with stronger electronegativity into the Fe-N-C catalyst, forms an electron-withdrawing environment around the FeN4 site, reduces the electronegativity of the FeN4 site, and weakens the adsorption strength of the FeN4 site on the oxygen reduction intermediate. Meanwhile, the metal Sn is weaker in reactivity with hydrogen peroxide produced by the reaction of oxygen via a two-electron process than Fe, reduces the concentration of free radicals produced by the reaction, improves the stability of the carrier and active sites, and can effectively prevent the shedding of Fe. The application uses the catalyst as a cathode catalyst of a proton exchange membrane fuel cell, is low in cost, and can simultaneously meet the requirements of high catalytic activity and good stability.

The application discloses a nitrogen-doped carbon-coated three-metal catalyst and a preparation method and application thereof, and belongs to the field of catalyst preparation and application. The method adopts sucrose, melamine and metal salt as low-cost raw materials, and forms an alkaline environment with the assistance of sodium hydroxide. In the environment, melamine is hydrolyzed into cyanuric acid, which is complexed with sucrose metal ions to form a stable supramolecular aggregate precursor containing metal, and then realizes effective encapsulation of the metal in a high-temperature pyrolysis process. The synergistic effect of the three metal elements Co, Ni and Zn significantly improves the performance of the catalyst, so that CoNiZnO@NC-600 not only exhibits high conversion rate (98.4%) and selectivity (99%) in the reaction of hydrogenation conversion of furfural to furfuryl alcohol, but also has excellent cycle stability, thereby providing a new efficient method for the hydrogenation conversion of biomass-derived compounds.

The present disclosure provides an engineered epitaxial wafer of an ultra-thin GaN HEMT by wafer bonding and a manufacturing method thereof. According to an embodiment of the present invention, there is provided an engineered epitaxial wafer of an ultra-thin GaN HEMT by wafer bonding, comprising: a support substrate; an electrically insulating thin film region disposed on the support substrate; a buffer region disposed on the electrically insulating thin film region and containing Al(x)Ga(1-x)N (0≤x<1) doped with undoped carbon (C) and iron (Fe); a channel region disposed on the buffer region and containing Al(y)Ga(1-y)N (0≤y≤1); and a barrier region disposed on the channel region and containing Al(z)Ga(1-z)N (0<z<1) or In(w)Al(1-w)N (0<w<1).

The application relates to a composite type corrosion and scale inhibition water treatment agent, which is obtained by in-situ copolymerization of phosphono carboxylic acid copolymer after modification of nitrogen-doped carbon quantum dots on the surface of attapulgite as a carrier. The application has the beneficial effects that: the attapulgite is used as the carrier, can be used as a grafting bridge to load the carbon quantum dots on the surface and in-situ generate the phosphono carboxylic acid copolymer, and has a synergistic effect; the nitrogen-doped carbon quantum dots have rich amino, carboxyl and hydroxyl functional groups on the surface, make it difficult for calcium carbonate microcrystals to gather or interfere with the normal growth of the crystals to inhibit scale crystal generation, have high stability, are coated with zinc ions, improve the antibacterial property of the material, are modified on the surface of the attapulgite, have excellent adsorption performance, and can effectively remove organic matters, heavy metals and the like in water; the phosphono carboxylic acid copolymer is in-situ generated on the surface of the attapulgite, has a good compounding effect, has a good effect on corrosion inhibition, and has good corrosion inhibition performance.

The invention discloses a sulfur-nitrogen co-doped carbon quantum dot modified polyaspartic acid derivative as well as a preparation method and application thereof. The derivative is prepared by taking citric acid and L-cysteine as precursors, synthesizing sulfur-nitrogen co-doped carbon quantum dots (SN-CDs) with rich functional groups on the surface by adopting a hydrothermal method, and introducing the sulfur-nitrogen co-doped carbon quantum dots into a side chain of polyaspartic acid (PASP) through graft copolymerization. The derivative not only retains the complexing ability of polyaspartic acid with metal ions such as calcium and magnesium, but also has excellent scale and corrosion inhibition performance; the optical characteristics of the carbon quantum dots are inherited, and stable fluorescence can be emitted under the excitation of specific wavelength, so that in-situ and real-time concentration monitoring in an industrial circulating cooling water system by utilizing a fluorescence spectrum technology is supported. The product does not contain phosphorus, is environment-friendly, conforms to the development trend of a green water treatment technology, and provides an innovative material solution for intelligent monitoring and fine management of a circulating water system while improving the comprehensive performance of scale and corrosion inhibition.

The application discloses application of a cerium monatomic functional material in preparation of a tumor radiotherapy sensitizer. SA In the material, cerium is dispersed on a nitrogen-doped carbon carrier in a monatomic form and forms a stable coordination structure with N / O. The application determines the structure-activity relationship of the unique physical and chemical structure and multiple enzyme activities, verifies the radiotherapy sensitization effect and biological safety in and out of the body. The material has multiple enzyme activities such as simulating peroxidase and glutathione oxidase, can efficiently catalyze ROS and consume GSH, and enhances DNA damage and apoptosis induced by ionizing radiation. In vitro clone formation experiments show that the radiotherapy sensitization ratio reaches 1.38, which is better than that of CeO2 nano clusters (1.17). In vivo experiments on tumor-bearing mice prove that the material combined with radiotherapy can significantly inhibit tumor growth, prolong survival time, and has good biocompatibility. The application provides a new strategy of high efficiency and low toxicity for tumor radiotherapy sensitization, and has a good clinical application prospect.

The application discloses a preparation method of nitrogen-doped carbon-silicon nanofibers and application of the nitrogen-doped carbon-silicon nanofibers in a lithium ion battery negative electrode material, and belongs to the technical field of lithium ion battery negative electrode materials. The method comprises the following steps: mixing silicon nanoparticles and a carbon source, performing electrostatic spinning, stabilization treatment and carbonization treatment, and obtaining carbon-silicon nanofibers; and then mixing the carbon-silicon nanofibers with a nitrogen source, performing heat treatment under an inert atmosphere, making nitrogen elements doped into a carbon skeleton, and obtaining nitrogen-doped carbon-silicon nanofibers. The material obtained by the application is a one-dimensional nanofiber structure, silicon particles are uniformly wrapped in carbon fibers, and nitrogen elements are uniformly distributed in the carbon skeleton. The method can realize uniform nitrogen doping while maintaining the microstructure of the material, and significantly improves the electronic conductivity and interface stability of the material. The material obtained by the application is used as a lithium ion battery negative electrode, and exhibits high reversible capacity and excellent cycle stability.

The present application belongs to the technical field of fuel cell electrocatalysts, and particularly relates to a bromine-modified iron-nitrogen-carbon oxygen reduction electrocatalyst with high iron loading and atomic dispersion, and a preparation method and application thereof. The electrocatalyst is a porous carbon-based material, and contains carbon, nitrogen, bromine and iron elements, wherein the iron is anchored in the nitrogen-doped carbon substrate in the form of atomic dispersion. The preparation method comprises the following steps: dissolving a Fe-based metal macrocycle compound in an organic solvent, mixing the organic solvent with an aqueous solution containing 2-methyl imidazole and a Br-containing precursor, and adding an aqueous solution containing a zinc salt and a surfactant for co-assembly to obtain a precursor; and pyrolyzing the precursor to obtain a bromine-modified Fe-N-C electrocatalyst. Compared with the Fe-N-C electrocatalyst without bromine modification, the electrocatalyst can effectively regulate the local coordination environment of iron sites, and has the advantages of atomic dispersion, high iron loading and excellent oxygen reduction reaction activity, and can be used in fuel cells and related electrochemical energy conversion devices.

The present application relates to the field of battery, especially to a gradient pore hierarchical nitrogen-doped carbon-coated composite sodium supplement agent and its preparation method and application, comprising: a composite sodium supplement agent core and a coating layer coated on the surface of the composite sodium supplement agent core; wherein the composite sodium supplement agent core comprises: an inorganic sodium supplement phase and an organic sodium supplement phase; the coating layer comprises from inside to outside: an inner dense amorphous carbon layer, a middle mesoporous carbon layer and an outer macroporous carbon layer. The present application innovatively designs a gradient pore carbon coating structure from inside to outside, the inner dense amorphous carbon layer realizes efficient isolation protection, the middle mesoporous carbon layer solves the problem of ion transmission obstruction, and the outer macroporous carbon layer improves the electronic conduction and volume buffering capacity, completely solving the inherent contradiction between the denseness of the traditional carbon coating layer and ion transmission, realizing the synergy and unity of "isolation protection-ion transmission-electronic conduction".

This application relates to the field of bio-agricultural technology, specifically disclosing an agricultural composition and its application based on carbon quantum dots to enhance crop photosynthesis. It is made from raw materials comprising the following parts by weight: 3-8 parts nitrogen-doped carbon quantum dots; 8-25 parts biostimulant; 1-4 parts wetting and dispersing agent; and 200-800 parts water. The nitrogen-doped carbon quantum dots are prepared by reacting aniline derivatives and biochar under a nitrogen atmosphere, followed by cooling to room temperature. Its application involves: S1, diluting the agricultural composition with water to the effective concentrations of carbon quantum dots and biostimulant; S2, applying the diluted agricultural composition to crop growth stages via foliar spraying or drip irrigation. The agricultural composition of this application can promote crop growth, increase biomass and yield, and has the advantages of ensuring uniform and stable dispersion of nitrogen-doped carbon quantum dots in solution and synergistically enhancing photosynthetic performance with biostimulant.

This invention discloses a method for preparing a seawater-resistant, chlorine-doped carbon-based electrode material with five-membered ring defects. The method includes step one: mixing the chlorine-doped system; step two: pyrolysis activation treatment; step three: cooling and washing; and step four: rewashing and drying. This invention utilizes the synergistic construction of chlorine doping and five-membered ring defects. The localized negative charge induced by chlorine doping enhances its resistance to chloride ions in seawater, significantly improving the material's stability and service life in a seawater environment. The five-membered ring defects significantly improve the electronic structure and catalytic activity of the carbon material, thereby enhancing its electrocatalytic performance and improving the overall electrochemical performance of the carbon-based electrode material. The introduction of chlorine doping during the preparation process also serves as a template to promote the construction of porous nanosheet structures in the carbon material. The method is simple to operate, low in cost, and suitable for large-scale production. It balances structural innovation, superior performance, and process feasibility, possessing broad industrial prospects and technological promotion value.

The application belongs to the technical field of hydrogen production catalysts for electrolysis of water, and particularly relates to a preparation method of a nitrogen-doped carbon quantum dot loaded ruthenium-based hydrogen evolution electrocatalyst, which comprises the following steps: (1) taking alkali lignin and urea, adding them into deionized water, mixing uniformly, then adding ruthenium trichloride, mixing uniformly, and performing hydrothermal reaction to obtain a precursor; (2) after the precursor is reduced to room temperature, freeze-drying and annealing are performed to obtain the nitrogen-doped carbon quantum dot loaded ruthenium-based hydrogen evolution electrocatalyst. The electrocatalyst prepared by the method has high catalytic activity and stability, and can particularly exhibit excellent catalytic performance in a full pH range (including acid, neutral and alkaline conditions, i.e. 0-14 pH values).

The purpose of this invention is to synthesize a carbon dot-based nanozyme and its cascade detection application. Using ascorbic acid and 1,3,5-pyromellitic acid as raw materials, ethylenediamine as a nitrogen dopant, and ferric chloride as a metal source, a one-step microwave synthesis method is employed in a microwave reactor (glass material). This method solves the problem of high energy consumption caused by the need for high temperature, high pressure, or long reaction time in existing technologies. Characterization and analysis of its morphology, structure, and properties revealed that the prepared iron-nitrogen co-doped carbon dot-based nanozyme consists of two-dimensional spherical carbon nanoparticles with excellent Fe-N... x The active site exhibits POD-like enzyme activity, with catalytic activity exceeding that of most reported nanozymes. Furthermore, this invention synergistically utilizes its peroxidase-like catalytic activity and photodynamic effect to significantly enhance reactive oxygen species (ROS) generation, achieving highly sensitive detection of organophosphorus pesticides and significantly reducing their detection limits. This synergistic strategy provides a new approach for expanding the application of nanomaterials in chemical analysis and sensing.

This invention discloses a method for preparing a metal phosphide catalyst. The method involves uniformly mixing a carbon-containing precursor with a phosphorus-containing precursor solution and then drying the mixture to obtain a solid product. The solid product is then pyrolyzed under an inert atmosphere. The pyrolyzed solid product is washed and dried to obtain a phosphorus-doped carbon material. A metal salt solution is then uniformly mixed with the obtained phosphorus-doped carbon material, dried, and reduced under a hydrogen-containing gas atmosphere to obtain the metal phosphide catalyst. Thus, this invention prepares phosphorus-doped porous carbon through the pyrolysis of a carbon precursor and a phosphorus-containing precursor. This utilizes the binding effect of phosphorus functional groups with metal ions to inhibit the migration and aggregation of metal particles under high-temperature conditions, effectively preventing metal particle sintering and improving the yield of the target catalytic product.

This invention relates to the field of carbon dioxide methanation catalysis technology, and discloses a low-temperature carbon dioxide methanation catalyst, its preparation method, and its applications. The catalyst comprises an active component, a support, and an auxiliary agent; the active component is at least one selected from nickel, ruthenium, and rhodium; the support is nitrogen-doped carbon nanotubes; and the auxiliary agent includes at least one selected from transition metal elements and / or rare earth metal elements. The methanation catalyst of this invention exhibits excellent methanation catalytic activity at low temperatures and good stability at high temperatures, producing highly selective methane. The catalyst preparation method is simple and has promising prospects for industrial application.

The invention provides preparation and application of a carbon carrier loaded Ru-based alloy catalyst, and belongs to the technical field of electrolytic hydrogen production. According to the catalyst, firstly, nitrogen-doped carbon is loaded on a porous substrate, then Ru-based metal is further loaded on the basis of the porous substrate loaded with the nitrogen-doped carbon, and the Ru-based alloy is obtained through electrochemical reduction of the Ru-based metal. The catalyst can show excellent hydrogen evolution activity and stability in high-corrosivity acidic water electrolyte, the RuNi alloy catalyst can reach the current density of 1.5 A cm <-2 > only with the overpotential of 200 mV, the stability of more than 2000 hours is shown under the high current density of 1.1 A cm <-2 >, and the catalyst can be effectively applied to the field of electrolytic hydrogen production.

The embodiments of this disclosure generally relate to the fabrication of integrated circuits. More specifically, the embodiments described herein provide techniques for depositing nitrogen-doped diamond-like carbon films for patterning applications. In one or more embodiments, a method for processing a substrate includes: flowing a deposition gas containing a hydrocarbon compound and a nitrogen dopant compound into a processing volume of a process chamber on which the substrate is positioned on an electrostatic chuck; and generating plasma at or above the substrate by applying a first RF bias voltage to the electrostatic chuck to deposit a nitrogen-doped diamond-like carbon film on the substrate. The nitrogen-doped diamond-like carbon film has a density greater than 1.5 g / cc and a compressive stress of about -20 MPa to less than -600 MPa.

The application relates to the technical field of textile dyeing and finishing, and particularly discloses a foam nickel loaded nitrogen-doped carbon nanotube / Mn-Zn-P alloy composite material, a preparation method and application thereof. The preparation method is as follows: a calcium carbonate / Ni-Fe alloy layer is prepared on the surface of foam nickel; then, an organic alcohol amine and an alkyne substance are used as a nitrogen source and a carbon source to pre-deposit a nitrogen-containing carbon layer, and subsequently, N2-NH3 and N2-ethylene mixed gas is sequentially introduced to carry out stage-by-stage chemical vapor deposition, so that a Ni / nitrogen-doped carbon nanotube array is obtained; finally, Mn-Zn-P alloy particles are loaded through constant-current electrodeposition. The composite material prepared by the application has high conductivity, excellent corrosion resistance and cycle stability, and provides an ideal electrode material for electrocatalytic hydrogenation reduction, and can be directly used as an indigo reduction electrocatalytic electrode, so that the application has wide industrial application prospects in the field of blue jean dyeing.

The application relates to the technical field of electrocatalytic reduction of carbon dioxide, and provides a preparation method and application of a zinc-iodine diatomic pair (Zn-I / ICPs) carbon dioxide electro-reduction catalyst. The zinc-iodine diatomic pair is prepared by using nitrogen-doped carbon as a carrier and an in-situ gas-capturing MOF method, and the specific steps are as follows: first, ZIF-8 precursors are prepared by using zinc nitrate hexahydrate and 2-methyl imidazole as raw materials; then, the ZIF-8 and potassium iodide are co-pyrolyzed under a nitrogen atmosphere, the potassium iodide is used as an iodine source, zinc and iodine atoms are combined in an atomic dispersion form through a gas-phase doping mode, and a Zn-I diatomic pair is formed. The preparation method is simple and controllable, in the prepared Zn-I / ICPs, Zn sites and I sites successfully construct a synergistic catalytic center with complementary functions and electronic coupling, can effectively control an electrochemical microenvironment, accelerate water dissociation and proton transfer, and simultaneously highly effectively inhibit a hydrogen evolution side reaction, and the zinc-iodine diatomic pair can catalyze carbon dioxide electro-reduction to prepare carbon monoxide with high activity and high selectivity.

To improve the responsiveness of the resistance value to humidity fluctuations. [Solution] The method for manufacturing a moisture-sensitive material S110 includes: a first step S110-1 in which a first laminate is manufactured by forming a first layer made of graphite on a substrate; a second step S110-2 in which a second laminate is manufactured by forming a second layer made of a plurality of nitrogen-doped carbon nanowalls on the first layer of the first laminate; a third step S110-3 in which a third laminate is manufactured by attaching one or more catalyst particles to the plurality of carbon nanowalls constituting the second layer of the second laminate; and a fourth step S110-4 in which the third laminate is subjected to hydrogen treatment.

The application provides application of a nitrogen-doped carbon-based iron monatomic catalyst in degradation of ADC drugs in wastewater, and belongs to the technical field of advanced oxidation water treatment. The nitrogen-doped carbon-based iron monatomic catalyst with a two-dimensional wrinkled ultrathin morphology is prepared by a nano-magnesium oxide template assisted method. In application, the catalyst is dispersed in wastewater containing ADC drugs, stirred and adsorbed to adsorption equilibrium, then a proportion of persulfate is added, and reaction is carried out under the condition that pH is 3-9, so that efficient degradation of the ADC drugs is realized. The application has the advantages of high degradation efficiency, fast reaction speed, wide pH adaptation range, strong anion interference resistance, good broad-spectrum property, good catalyst stability and the like, and actual wastewater toxicity evaluation proves that the application has good detoxification capacity, and has wide application prospect in the field of treatment of refractory organic wastewater such as pharmaceutical wastewater and hospital wastewater.

This invention provides a multi-scale neighborhood synergistic catalyst, its preparation method, and its applications. The method uses nitrogen-doped carbon nanotubes (NCNTs) as a structural platform, achieving precise construction of Al diatomic sites through vapor-phase migration, trapping, and reduction fixation of volatile metal precursors. Furthermore, it combines secondary vapor-phase deposition to drive the surface deposition and nucleation of metal-containing Y species, resulting in in-situ growth into metal nanoclusters to obtain Al2-Y. NC / NCNT catalyst. In this catalyst, Al species are atomically dispersed and exhibit coordination unsaturation, while metallic Y is anchored to its neighboring interface in the form of nanoclusters. Both maintain a stable nearest-neighbor structure under the confinement and anchoring effect of carbon nanotube doping sites. The Al2 sites can regulate the selective adsorption configuration and electronic state of reaction intermediates, while the Y nanoclusters provide efficient hydrogen molecule activation and overflow hydrogen supply channels. Together, they lower the energy barrier of key hydrogenation steps and suppress excessive hydrogenation side reactions. This invention features mild conditions, a simple process, and exhibits excellent hydrogenation activity and selectivity.

The application relates to preparation and application of carbon dot composite terbium metal organic framework material which can be used for uric acid identification in urine. S1, raw materials are selected, including terbium nitrate, trimesic acid, ammonium bicarbonate and sodium citrate; S2, trimesic acid is dissolved and stirred; S3, terbium nitrate solution is added into the solution obtained in S2 and stirred; S4, standing, centrifugal drying and then white terbium metal organic framework material is obtained; S5, ammonium bicarbonate and sodium citrate are dissolved in deionized water, ultrasonic treatment is carried out, then the solution is transferred into a high-pressure reaction kettle and reacts; S6, the solution obtained in S5 is centrifuged, the supernatant is filtered by using a microporous filter membrane, nitrogen-doped carbon dots are obtained by dialysis; S7, different volumes of carbon dots are added into the terbium metal organic framework material and stirred; S8, carbon dot composite terbium metal organic framework material is obtained through centrifugal drying; and S9, the obtained carbon dot composite terbium metal organic framework material is used for uric acid detection.

The application discloses a kind of composite positive electrode materials, including layered oxide and cladding layer, cladding layer is coated outside layered oxide, layered oxide general formula is NaMeO2, wherein, Me is one or several of Ni, Fe, Mn, Co and the combination of Cu, cladding layer is sulfur-doped carbon-coated Cu-Sn alloy, and S-Sn chemical bond exists in cladding layer.The application also discloses its preparation method, which is to mix and grind layered oxide, Cu powder, Sn powder, organic carbon source solid powder and sulfur source solid powder, and then sinter at 500-600 DEG C for 2-3 hours in a protective atmosphere.The application also discloses a positive plate and a sodium-ion battery with the composite positive electrode material.The application enhances the bonding force between the cladding layer and the layered oxide substrate, and the S-Sn bond effectively inhibits the interlayer peeling of the cladding layer material during the cycle process, thereby improving the battery capacity retention rate.

This invention discloses a high-capacity nitrogen-doped porous silicon-oxygen-carbon anode material, its preparation method, and its application. The anode material comprises nitrogen-doped carbon material and biomass porous silicon-oxygen material, with the nitrogen-doped carbon material coating the biomass porous silicon-oxygen material. The nitrogen content in the anode material is ≥13 at%. This invention utilizes the crosslinking of amino acid materials with the Si-OH groups on the surface of the biomass porous silicon-oxygen material. Carbonization promotes the polymerization-cyclization-condensation of the amino acid materials to form a high-content nitrogen-doped carbon material that uniformly coats the biomass porous silicon-oxygen material. By optimizing the surface structure of the biomass porous silicon-oxygen material, the polymerization of amino acid materials or pyrolysis products with the biomass porous silicon-oxygen material is promoted, preparing a nitrogen-doped silicon-oxygen-carbon material rich in pores. By optimizing the lithiophilicity of the biomass porous silicon-oxygen material, the prepared nitrogen-doped biomass porous silicon-oxygen-carbon material exhibits excellent electrochemical performance and cycle stability.

This invention discloses a type of N-doped carbon nanodots and their application in the detection of tinidazole, belonging to the field of analytical detection. The preparation method of the N-doped carbon nanodots in this invention is as follows: L-lysine, ethylenediamine, and water are mixed to form a mixture, which is then heated to react. After the reaction, the N-doped carbon nanodots are purified. This invention is the first to use L-lysine and ethylenediamine as precursors to prepare carbon nanodots and achieve quantitative detection of tinidazole. It is low-cost, highly sensitive, and suitable for rapid on-site detection, possessing high practical value and promising prospects for widespread application.