343results about "Nitrogen-metal/silicon/boron binary compounds" patented technology

The invention provides embedded metal fullerene and a preparation method thereof. The preparation method comprises the following steps: mixing a metal source and graphite powder, and filling a hollow graphite rod with the mixture to prepare an anode; the electrode is installed at the anode end of an electric arc furnace, and on-line activation is conducted through anode and cathode short-circuit current under the inert atmosphere; then carrying out arc discharge under specific air pressure and current, and collecting generated carbon ash; performing ultrasonic extraction by using an organic solvent to obtain a fullerene crude extracting solution; and finally, performing multi-stage separation and purification by high performance liquid chromatography, and performing primary and fine separation by sequentially adopting preparative and semi-preparative chromatographic columns to obtain a high-purity product. According to the method, a complete technical path capable of efficiently and controllably preparing the ultra-high-purity embedded metal fullerene is formed through a synthesis process integrating online activation and accurate atmosphere regulation and control and a multi-stage gradient chromatography purification strategy, and a solid foundation is laid for application of atomic-scale accurate materials in the frontier fields of quantum devices and the like.

The invention provides a silicon negative electrode material, a preparation method and a lithium ion battery, and relates to the technical field of battery negative electrode materials. Stable lithium compound nano-particles are deposited or converted on the inner wall of porous carbon, silicon or silicon oxide or silicon-lithium alloy is induced to form nano-particles in the vapor deposition process, and the nano-particles are distributed with the lithium compound nano-particles as the center. The lithium compound has a high boiling point, can stably provide crystallization sites for silicon during vapor deposition, and prevents agglomeration of silicon nanoparticles; the inorganic lithium compound is a lithium ion conductor, has high mechanical strength, can improve the dynamics of the silicon negative electrode during lithium intercalation and deintercalation, and slows down the expansion of the silicon negative electrode.

A highly crystalline mesoporous sulphur functionalized carbon nitride and a process for producing the same. The process including the steps of: providing a carbon nitride precursor material; mixing the carbon nitride precursor material with a metal salt to form a first mixture; and, thermally treating the first mixture to produce the crystalline carbon nitride.

The invention is suitable for the technical field of semiconductor material synthesis, and provides a preparation method of a three-dimensional semiconductor GaN nanoflower material, according to the method, a solvothermal method is utilized to synthesize the three-dimensional tunable GaN nanoflower material which is stable in crystal structure, low in sample cost and environment-friendly, and the tunable GaN nanoflower material is obtained by controlling the reaction time. The obtained three-dimensional GaN nanoflower has a relatively large specific surface area and abundant active sites. In addition, the GaN nanoflower material increases the specific surface area, improves the electron transmission performance, improves the catalytic performance and enhances the light absorption performance, and shows remarkable performance advantages in the fields of photocatalysis, electrocatalysis, gas sensors, optoelectronic devices and the like.

The invention discloses a preparation method of a gas sensitive material, a gas sensor and a preparation method of the gas sensor, and relates to the field of sensors. The method comprises the following steps: mixing a hydrofluoric acid solution with an MAX phase material to prepare an MXene solution; the preparation method comprises the following steps: mixing a graphene oxide solution, a tungsten ion compound, ascorbic acid and an MXene solution, so that graphene oxide in the graphene oxide solution is reduced by the ascorbic acid, and an rGO / MXene / WO3 mixed solution is prepared; the rGO / MXene / WO3 mixed solution is subjected to a hydrothermal reaction, and the rGO / MXene / WO3 gas sensitive material is prepared. The invention aims to solve the problem that NO2 cannot be accurately and rapidly detected due to poor gas-sensitive performance of the existing gas-sensitive material.

Hybrid organic-inorganic MXenes (h-MXenes) having amido, imido, alkoxy, or aryloxy surface terminating groups and methods for synthesizing the hybrid organic-inorganic MXenes are provided. The synthesis of h-MXenes having a broad scope of erminal organic functional groups is carried out via the displacement of halide atoms from halide-terminated MXenes by deprotonated primary organic amines or deprotonated alcohols.

The invention provides a lithium-rich lithium supplement agent with high air stability and a preparation method thereof, and relates to the field of lithium ion battery lithium supplement agents. The preparation method of the lithium-rich lithium supplement agent with high air stability comprises the following steps: low-temperature carbonization coating and polymerization coating. According to the lithium-rich lithium supplement agent with high air stability and the preparation method, the air stability, the isolation performance and the water absorption of the lithium-rich lithium supplement agent are improved, the dynamic performance of the lithium-rich lithium supplement agent is improved, and the matching performance of the lithium-rich lithium supplement agent and a positive electrode material is improved; and the electrical performance is further improved.

The invention discloses a preparation method of a double-nonmetal plasmon multifunctional interference material, and relates to the technical field of smoke screen interference materials. The double nonmetal plasmon multifunctional interference material is MXene / TiN; according to the method, MXene / TiN is obtained by compounding MXene nanosheets and TiN nanoparticles through an ultrasonic-assisted method; the molar ratio of the MXene nanosheets to the TiN nanoparticles is 1: (0.1-9). According to the invention, TiN nanoparticles are combined with ultrathin MXene nanosheets through chemical bonds to obtain the dual-nonmetal plasmon material MXene / TiN, strong coupling between two nonmetal semiconductors with plasmon resonance effect is utilized, so that the dual-nonmetal plasmon material has good light absorption from visible light to near-infrared region, and the performance of the dual-nonmetal plasmon material is improved. The wave-absorbing material shows excellent wave-absorbing performance in an electromagnetic wave frequency band and has an efficient synergistic photo-thermal conversion effect.

The invention discloses a uranium nitride spherical particle preparation method, which comprises: mixing a carbon source and a solution to prepare gel particles; the carbon source comprises diamond powder; the gel particles are subjected to pretreatment and carbon thermal reduction nitridation treatment, and the uranium nitride spherical particles are obtained. According to the preparation method, the C / U molar ratio can be effectively controlled, and the prepared uranium nitride spherical particles have the advantages of being compact in structure, smooth in surface and high in purity.

The invention discloses a carbon nano tube for packaging M-NC single atoms and M3C nano particles as well as a preparation method and application of the carbon nano tube, and belongs to the field of composite materials and electrochemistry. The method comprises the following steps: preparing a mixed solution containing an organic ligand, a metal salt and a zinc salt; performing solvent heat treatment on the mixed solution to obtain a precursor; and mixing the precursor with dicyandiamide, and carrying out high-temperature heat treatment in an inert atmosphere to obtain a final product. According to the final product, the bamboo-shaped carbon nano tube is used as an outer frame, the packaged metal element M is wrapped in the outer frame of the carbon nano tube in the form of M-NC single atoms and M3C nano particles, and the metal element M is iron or cobalt. The product is low in cost, high in efficiency and good in stability when being used as an oxygen reduction electrocatalyst of a battery.

A method of manufacturing a nanocomposite may include combining a magnesium salt, an aluminum salt, and a ferric salt in stoichiometric proportions within 5 mol. % in an aqueous solvent including menthol or dextrose, to obtain a first mixture, heating the first mixture to remove at least 99.5 wt. % of the aqueous solvent to obtain a first solid, grinding the first solid into a first powder, calcining the first powder at a temperature of about 600° C. to 800° C. for a time of about 2 to 4 hours to obtain a second solid, grinding the second solid and urea, in an amount sufficient to form the nanocomposite, into a second powder, heating the second powder at a temperature of about 550° C. to 650° C. for a time of about 15 minutes to 1.5 hours to obtain the nanocomposite.

This invention discloses a lithium manganese iron phosphate composite material modified by a transition metal nitride and amorphous carbon composite coating, its preparation method, and its application, belonging to the field of lithium-ion battery technology. This invention uses vanadium nitride / amorphous carbon to composite-coat lithium manganese iron phosphate material, making the composite cathode material structure more stable. The use of vanadium nitride reduces the amount of carbon coating, avoiding the thickening of the coating layer and the decrease in tap density of the active material caused by high carbon content, which would hinder the lithium iron phosphate process. + The issue of diffusion. Vanadium nitride not only has good electrical conductivity, but also good Li... + Conductive transport properties enable rapid realization of Li + The insertion and extraction of Li not only improves the conductivity of the material, but also further opens up and increases the Li content on the surface of the cathode material. + The diffusion channels reduce the capacity loss of the modified material.

The invention discloses a kind of ferrocenyl-doped MOF-derived metal carbide electrocatalyst and its preparation method and application, preparation method includes:ZIF 8 is dissolved in anhydrous methanol to obtain solution A;Ferrocenyl monocarboxylic acid is dissolved in DMF to obtain solution B;Solution A and solution B are mixed uniformly to obtain reaction solution, and reaction solution is subjected to hydrothermal reaction;The product obtained after the reaction is centrifuged, washed, dried, calcined and carbonized to obtain the ferrocenyl-doped MOF-derived metal carbide electrocatalyst.The catalyst of the present invention has the advantages of being porous, having many active sites, further improves the catalytic performance of electrocatalyst, can be applied to disposable zinc-air battery as oxygen reduction catalyst, and has excellent electrochemical performance under alkaline conditions (0.1M KOH).

GRAPHITICAL CARBON NITRIDE WITH POROUS STRUCTURES The present invention relates mainly to a graphitic carbon nitride with porous structures, the graphitic carbon nitride having at least one heptazine motif and a pore volume greater than 0.0045 cm³ / g, derived from a first type of pore having a specific pore diameter of 1 nm or more and less than 15 nm, and derived from a second type of pore having a specific pore diameter of 15 nm or more and 50 nm or less. The graphitic carbon nitride can provide improved UV absorption properties and exhibit the desired colors. Figure for abstract: none

The present application relates to the technical fields of wastewater purification and energy storage material, and discloses an energy storage carbon material, a preparation method and application thereof.The method comprises the following steps: carbonizing biomass waste enriched with metal ions to obtain an energy storage carbon material.The energy storage carbon material can be used to prepare a secondary metal / ion battery.The energy storage carbon material prepared by the present application can promote the uniform deposition of metal in the charging and discharging process, avoid the safety problems caused by dendrite growth, and at the same time, the metal ions in industrial wastewater can be used to prepare high-value-added secondary battery energy storage materials by means of a simple and low-cost method of biosorption.

The invention discloses a flocculent vanadium-doped MoN / CNT composite material and a preparation method and application thereof.The method comprises the steps that 1, ammonium molybdate is added into absolute ethyl alcohol to be dissolved, and a solution A is obtained; 2, adding 2-methylimidazole into deionized water, and dissolving to obtain a solution B; 3, adding the solution A into the solution B, stirring, carrying out suction filtration, separating out a precipitate, and drying to obtain a precursor I; 4, adding the precursor I into deionized water, and stirring to obtain a turbid solution; 5, ammonium metavanadate and polyvinylpyrrolidone are added into absolute ethyl alcohol, and a solution C is obtained; 6, adding the solution C into the turbid solution, stirring, carrying out suction filtration, separating out a precipitate, and drying to obtain a precursor II; 7, performing low-temperature sintering on the precursor II in an argon atmosphere to obtain a precursor III; and 8, mixing the precursor III with urea, and performing high-temperature sintering in an argon atmosphere to obtain the vanadium-doped MoN / CNT composite material which has high energy density and high conductivity and can endow an energy storage device with high rate capability and long cycle life.

This invention provides a bamboo-like carbon nanotube with a heterostructure, its preparation method, and its applications. The preparation method includes: dissolving cobalt nitrate and heteropolyacid in ethanol to obtain a first solution; dissolving dicyandiamide in a mixed solution of ethanol and water to obtain a second solution; mixing phytic acid with the second solution uniformly and performing a polymerization reaction to obtain a third solution; adding the first solution to the third solution to perform a chemically induced self-assembly reaction, washing and drying to obtain a dicyandiamide-heteropolyacid-phytic acid-cobalt ion organic polymer; and calcining to obtain the bamboo-like carbon nanotube with a heterostructure. This method is simple and inexpensive; the Co2P and WN / MoN nanoparticles in the bamboo-like carbon nanotube are uniformly distributed in the carbon matrix, improving the electrochemical performance of the material; the introduction of dicyandiamide and phytic acid enables nitrogen and phosphorus doping of the carbon framework, improving the conductivity of the carbon support; and the resulting product exhibits high capacity and excellent cycle stability as a cathode material for metal-air batteries.

The invention discloses a surface ruthenium-nitrogen coordinated Ru nano-particle catalyst, a preparation method and application of the surface ruthenium-nitrogen coordinated Ru nano-particle catalyst in bisphenol A hydrogenation reaction. Ruthenium acetylacetonate and a nitrogen-containing ligand form a porous precursor by adopting a sol-gel method, and then the porous precursor is subjected to inert gas pyrolysis and H2 / NH3 activation treatment. In an XPS (X-ray polystyrene) N1s spectrogram of the prepared Ru nano-particle catalyst, Ru-N coordination nitrogen at 399.0-399.5 eV accounts for 30%-60% of the total nitrogen atom. When the catalyst is applied to bisphenol A hydrogenation reaction, the sulfur content of the raw material is less than 100ppm, and the yield of hydrogenated bisphenol A can reach 94%; the attenuation is less than 5% after 5 cycles, and the sulfur adsorption capacity of the Ru nano-particle catalyst is less than 0.1 wt%. The surface ruthenium-nitrogen coordinated Ru nano-particle catalyst is high in activity, good in selectivity and excellent in sulfur tolerance, can stably play a role in a sulfur-containing environment, is simple and controllable in preparation process, and is beneficial to industrial production.

In a general aspect, a ceramic thin film with nanotwinned regions at a tunable volume fraction is manufactured. In some aspects, a method for manufacturing a ceramic thin film on a surface of a substrate in an evacuated chamber is disclosed. The ceramic thin film includes crystalline grains; and each of the crystalline grains includes one or more nanotwinned regions. The one or more nanotwinned regions have a volume fraction in a range of 30-80% of the ceramic thin film. The ceramic thin film comprises titanium, nitrogen, and boron. A plurality of targets including a plurality of sputtering materials is prepared. A gas atmosphere in the evacuated chamber is formed. Electric power is supplied to the plurality of targets to cause co-sputtering of the plurality of sputtering materials to form the ceramic thin film with the one or more nanotwinned regions.

A system including a material is described. The material includes at least one rare earth (R), hydrogen (H), and at least one dopant (D). The material includes R, H, and D with R:H:D in a ratio of 1:x:y, where x is greater than 2 and less than 3, and y is at least 0.4 and less than 1.

This invention discloses a modified lithium lanthanum zirconium oxide material, its preparation method, and its application, relating to the field of solid electrolyte material preparation and application. The modified lithium lanthanum zirconium oxide material of this invention comprises lithium lanthanum zirconium oxide material and a TiCN / W-Cu composite material, with the TiCN / W-Cu composite material coating the outer surface of the lithium lanthanum zirconium oxide material. Coating the surface of the lithium lanthanum zirconium oxide material with the TiCN / W-Cu composite material effectively increases the ionic conductivity of the lithium lanthanum zirconium oxide material and also helps improve the material's processing performance, making it suitable as a solid electrolyte for use in lithium-ion solid-state batteries.

An exhaust valve includes a valve head and a valve stem extending from the valve head. The valve head includes a combustion face and a seat face. The combustion face and the seat face are on opposing sides of the valve head. The seat face is configured to matingly engage an opposing surface. The valve head is formed of a base material. A valve thermal management composition coats at least a portion of the seat face and comprises increased thermal conductivity relative to the base material of the valve head.

The invention belongs to the technical field of energy materials, and particularly relates to a Mo2N-C hybrid nanosheet and a preparation method and application thereof. According to the preparation method disclosed by the invention, an organic-inorganic hybrid poly dimethyl diallyl ammonium chloride (PDDA) intercalated MoS2 (MoS2 / PDDA) nanosheet is used as a precursor, and the Mo2N nanoparticle hybrid material (Mo2N-C) coated with the graphene nanosheet is prepared through one-step nitridation. The preparation method provided by the invention can effectively improve the utilization rate of the material, and is simple to operate and high in universality. The small-size Mo2N nanoparticles formed by the method not only can provide abundant electrochemical energy storage sites, but also can be used as supporting points among carbon layers to form abundant channels, and the existence of the graphene carbon layer can increase the uniform dispersion degree of the Mo2N nanoparticles, so that the Mo2N structure is stabilized, and the specific capacitance is further improved.

The invention discloses a preparation method of a nano tungsten nitride powder material, and belongs to the technical field of preparation of transition metal nitride materials. The preparation method comprises the following steps: by taking tungsten powder as a tungsten source and sodium azide and melamine as nitrogen sources, grinding and mixing the tungsten powder and the sodium azide according to a mass ratio of 5: 1, and tabletting the mixture and the melamine by using a hydraulic machine respectively, so as to obtain the composite material. The method comprises the following steps: preparing a cylindrical shape by wrapping a cylindrical sheet formed by pressing a mixture of tungsten powder and sodium azide with two pieces of melamine according to the size of a synthesis cavity, putting the cylindrical raw material into a heating container, putting the heating container into the synthesis cavity, keeping the temperature and pressure for 10 minutes at the pressure of 3.0-5.0 GPa and the temperature of 1500-1800 DEG C, cooling and relieving the pressure, and finally putting a sample into diluted hydrochloric acid for cleaning, and preparing the nano tungsten nitride powdery material. The technological process is simple, and the preparation period and the sintering time are shortened; air pollution and resource waste are avoided; the prepared nano powdery material has the characteristics of high purity, easiness in impurity removal and the like.

The invention provides a powdery perovskite nitride with room temperature polarity and metallic property, the chemical formula of the powdery perovskite nitride is CeWN3, and the particle size is 1-100 [mu] m. The invention also provides a method for preparing the perovskite nitride, which comprises the following steps of: (1) weighing a Ce source and a W source according to a stoichiometric ratio, and adding a nitrogen source, so that the total mole number of the nitrogen element is 6-15 times of the mole number of metal elements in the Ce source or the W source; (2) mixing and grinding the raw materials in the step (1) in a protective atmosphere, sealing and wrapping, and synthesizing to obtain a crude product; (3) removing a by-product sodium in the crude product to obtain a product precursor; (4) pressing the product precursor into a flaky object, and covering the upper side and the lower side of the flaky object with a nitrogen source to obtain a flaky object with a sandwich structure; and (5) sealing and wrapping the sheet-shaped object with the sandwich structure, and nitriding to obtain the perovskite nitride. The perovskite nitride disclosed by the invention shows unique polarity-metallic combination at room temperature, which is extremely rare in perovskite type nitrides.

To provide a high-purity gallium nitride particles having a low oxygen content suitable for a raw material or a sintered body.SOLUTION: Gallium nitride particles are characterized in that the oxygen content is 0.5 at.% or less and the total impurity amount of elements, Si, Ge, Sn, Pb, Be, Mg, Ca, Sr, Ba, Zn and Cd, is less than 10 wtppm.SELECTED DRAWING: None

The invention discloses a preparation method of a transition metal doped anti-perovskite nitride catalyst, a modified CuNNi < 2.25 > Mo < 0.75 > catalyst is doped with Mo, the morphology of the modified CuNNi < 2.25 > Mo < 0.75 > is changed, the contact area of the catalyst and an electrolyte is increased, the catalytic performance of the catalyst is greatly improved, and compared with the unmodified CuNNi < 3 >, the transition metal doped anti-perovskite nitride catalyst has the advantages that the transition metal doped anti-perovskite nitride catalyst is more stable in performance and more stable in performance. The Gibbs free energy of the CuNNi < 2.25 > Mo < 0.75 > in different intermediate states in HER and OER is improved, which shows that the electro-catalytic performance of the CuNNi < 2.25 > Mo < 0.75 > is remarkably improved by introducing Mo.

This invention provides substantially impurity-free and quantum-efficient group III nitride nanoparticles. When synthesizing group III nitride semiconductor nanoparticles with a particle size of less than 16 nm by reacting a material containing one or more group III elements M in a liquid phase, trimethylindium is used as at least one group III element material among the materials containing one or more group III elements M. Before the nanoparticle synthesis reaction, trimethylindium is dissolved in a coordination solvent to form a precursor, and this precursor is reacted with other group III element materials and a nitrogen source in a solvent under an inactive atmosphere at temperatures above 300°C to synthesize the nanoparticles.

To provide powder which contains carbon, nitrogen, boron and oxygen as constituent elements and contains particles having the same crystal structure as boron nitride with a turbulent structure and which can improve the productivity of hexagonal boron nitride.SOLUTION: One aspect of the present disclosure provides powder which contains carbon, nitrogen, boron, and oxygen as constituent elements and contains particles having the same crystal structure as boron nitride with a turbulent structure and which has a value of A / B of 1.4 or less when, in the Raman spectrum, A is a maximum value of a peak in the range of wave number 1,480 cm-1 to 1,900 cm-1 and B is a maximum value of a peak in the range of wave number 1,000 cm-1 or more and less than 1,480 cm-1.SELECTED DRAWING: None