168results 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.

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 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.

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.

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 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 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

A preparation method of submicron powder of high-entropy nitride via nitride thermal reduction with mechano-chemical assistance, comprising material preparation—grinding—activation—preforming—reaction. In the present invention, high-entropy metal nitride and silicon nitride is used as raw materials, soft mechanochemical activation technologies are used to reduce reaction activation energy of the system, thereafter, by thermal reduction of the nitride, high-purity high-entropy nitride powder is prepared with solid phase methods, and the shortage of high-purity high-entropy nitride powder is addressed. There is no impure phase in the (Hf0.2Zr0.2Ti0.2Nb0.2Ta0.2)N high entropy powder prepared according to the present invention, and a single phase solid solution of good crystallinity is formed, and distribution of elements and ingredients in the powder is even, no foreign element is present, and oxygen content is controlled to be less than 0.3%.

The invention discloses a tungsten nitride / carbon composite material as well as a preparation method and application thereof. The preparation method adopts a molten salt synthesis method and takes tungsten trioxide as a tungsten source, thiourea as a nitrogen source and a sulfur source, melamine resin as a carbon source and sodium chloride as a molten salt template. Under the room temperature condition, powder obtained through ball milling is subjected to high-temperature roasting through a tubular furnace to prepare the tungsten nitride and carbon composite material, and the pore channel structure and the heteroatom content of the material can be adjusted by controlling the proportion of precursors. The product yield of the method reaches 16%, and the material can be used as the water electrolysis hydrogen production catalyst, and is a very ideal method for preparing the water electrolysis hydrogen production catalyst.

The application discloses a preparation method and application of lithium nitride. The preparation method comprises the following steps: after surface treatment, metal lithium is placed in a nitrogen atmosphere to generate incomplete lithium nitride through a nitriding reaction; and the incomplete lithium nitride is crushed in an inert gas atmosphere and a plasma atmosphere to obtain lithium nitride. The lithium nitride obtained through the method is applied to lithium ion batteries as a lithium supplement additive. The lithium nitride obtained through the preparation method has small particle size, uniform distribution, high activity and high purity, and has high decomposition rate and low decomposition potential as the lithium supplement additive.

This invention relates to the field of metallurgical technology, and more particularly to a method for preparing vanadium nitride using a mixed reducing gas. The method includes: grinding vanadium trioxide uniformly and pressing it into vanadium pentoxide tablets; placing the tablets in an electric furnace; first heating to 500-700°C under a nitrogen atmosphere; then introducing a mixed gas of methane, hydrogen, and nitrogen and holding for 20 minutes; then further heating to 800-850°C and holding for 20 minutes to obtain high-purity vanadium trioxide; subsequently heating to 1050-1150°C and holding for 1-5 hours to obtain crude vanadium nitride; stopping the introduction of the reducing gas and holding at 1050-1150°C for 0-4 hours under a nitrogen atmosphere; and then cooling to room temperature to obtain high-quality vanadium nitride. The technical solution mentioned in this invention features a low-temperature, short-time, and simple-to-operate vanadium nitride preparation process, enabling its large-scale application. Simultaneously, the resulting products are carbon monoxide and hydrogen, both of which can be recycled, thus helping to reduce carbon emissions.

Disclosed are an anode for a lithium secondary battery, a lithium secondary battery including the anode, and a manufacturing method thereof. In particular, the anode includes a lithium metal layer and an interfacial layer made of phosphorous-doped graphitic carbon nitride and a single ion conducting polymer.

The invention discloses a GaN-Ni3 (HITP) 2 / PANI trimethylamine sensor and a preparation method thereof, and belongs to the technical field of gas sensors. The sensor comprises a GaN epitaxial wafer, electrodes are deposited on two sides of the surface of the GaN epitaxial wafer, Ni3 (HITP) 2 is compounded in the middle of the GaN epitaxial wafer through a solution self-assembly method, and a PANI film is compounded on the surface of the GaN epitaxial wafer compounded with the Ni3 (HITP) 2; according to the method, the GaN material is etched and compounded with PANI and Ni3 (HITP) 2, the sensitive characteristic to TMA is improved by fully utilizing the synergistic effect of different materials, and high-performance detection of ppb-level TMA at the room temperature is achieved; compared with a traditional TMA detection mode, the prepared GaN-Ni3 (HITP) 2 / PANI trimethylamine sensor has the advantages of being high in detection sensitivity, high in response and recovery speed, capable of achieving room-temperature detection and the like; the problems of poor stability, weak recovery performance and low sensitivity of a trimethylamine sensor at room temperature are solved.

The invention discloses a microwave crystallization preparation method of a transition metal nitride ultrathin nanosheet, which comprises the following steps: (1) dissolving a transition metal salt and Li3N in an o-xylene solution, then adding an ethylenediamine solution, fully stirring, heating the solution, and carrying out microwave crystallization to obtain a precursor solution; and carrying out centrifugal collection, washing and vacuum drying to obtain the amorphous transition metal nitride nanosheet. The transition metal salt is WCl < 6 >, VCl < 3 > or MoCl < 5 >; and (2) in a nitrogen atmosphere, the amorphous transition metal nitride nanosheet is subjected to rapid microwave heating, and the highly crystallized transition metal nitride nanosheet is obtained. The preparation process of the TMN nanosheet with the surface-enhanced Raman effect, provided by the invention, has very strong controllability, the thickness of the prepared nanosheet is about 1-2nm, the phenomenon of sintering or aggregation is avoided, and the TMN nanosheet with the surface-enhanced Raman effect has an outstanding surface-enhanced Raman spectrum effect.

The application discloses a kind of high stability two-dimensional nanometer material aerogel and preparation method thereof, it is related to material science and nanotechnology field.The water solution of two-dimensional nanometer material is frozen and handled to obtain frozen tissue, then foam structure is obtained by freeze drying, after which foam structure is soaked in ionic solution, freeze-dried, to obtain two-dimensional nanometer material aerogel.The application constructs two-dimensional nanometer material foam structure and introduces ionic bond crosslinking mechanism, so that two-dimensional nanometer material is combined by ionic bond to form high stability aerogel, so that aerogel has excellent performance.The application breaks through the selection limit of traditional aerogel material, and is suitable for ceramic two-dimensional material and MXenes with insufficient surface functional groups, lays a foundation for two-dimensional material aerogel large-scale production and application in the field of energy, aerospace and the like.

To provide a lithium nitride manufacturing method that quickly forms lithium nitride and can stably produce lithium nitride.SOLUTION: The lithium nitride manufacturing method includes a step (A) of preparing a lithium member embedded with inorganic particles, and a step (B) of allowing the lithium member in a state of being embedded with inorganic particles and nitrogen to contact with each other for nitriding the lithium member.SELECTED DRAWING: None

A heterostructure includes a template layer and a ferroelectric semiconductor layer supported by the template layer, the ferroelectric semiconductor layer being single crystalline. The ferroelectric semiconductor layer includes an alloy of a III-nitride material. The alloy includes a Group IIIB element. The ferroelectric semiconductor layer is in contact with the template layer. The ferroelectric semiconductor layer has a thickness less than 100 nm.

The application discloses a rare earth nitride-containing aminomagnesium-lithium hydride composite hydrogen storage material and a preparation method thereof. The rare earth nitride-containing aminomagnesium-lithium hydride composite hydrogen storage material comprises a rare earth nitride and an aminomagnesium-lithium hydride composite system. The preparation method comprises the following steps: mixing aminomagnesium with lithium hydride, adding the rare earth nitride in the mixing process, transferring the mixed mixture into a ball mill tank, and ball milling under inert gas protection to obtain the rare earth nitride-containing aminomagnesium-lithium hydride composite hydrogen storage material. The raw material synthesis process is simple and controllable, and the cost is low. The hydrogen storage performance of the aminomagnesium-lithium hydride composite hydrogen storage material can be obviously improved by adding a small amount of the rare earth nitride. Moreover, the rare earth nitride can be purchased through a commercial channel, and the adding mode can be directly mixed with the raw material.

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 present invention mainly relates to a process for preparing sub-micrometer-sized graphitic carbon nitrides, comprising a step of milling or sonicating graphitic carbon nitrides. The present invention also relates to a sub-micrometer-sized graphitic carbon nitride having a volume size distribution in which the particle size of less than 1 μm dominates more than 50% of a volume of total particles in the suspension.

Provided is a scandium-doped aluminum nitride with nitrogen polarity. The nitride material is represented by the chemical formula ScXMYAl1-X-YN. M is at least one or more elements among C, Si, Ge, and Sn, X is greater than 0 and not greater than 0.4, Y is greater than 0 and not greater than 0.2, and X / Y is less than or equal to 5. The nitride material has piezoelectricity with a polarization direction of nitrogen polarity opposite to the direction of thin film growth.

The invention relates to a composition comprising a plurality of distinct particles, wherein at least one particle comprises: a core of a first three-dimensional perovskite material of chemical formula ABX3; a coating of a second two-dimensional perovskite material of chemical formula RA'N-1B'NX'3N+1 or R2A'N-1B'NX'3N+1 disposed on an outer surface of the core; A and A' each being selected from a first group of cations or an alloy of elements from the first group of cations; B and B' each being selected from a second group of inorganic cations or an alloy of elements from the second group of inorganic cations; X and X' each being selected from a group of halogens or an alloy of elements from the halogen group; R being selected from a third group of organic cations or an alloy of elements from the third group of organic cations. Figure for the abstract: Fig. 1

A gallium nitride single crystal substrate in which a low-index crystal plane closest to a principal surface of the substrate is a (0001) plane, wherein resistivity of the substrate at 200° C. is 1×10−2 Ω·cm or lower, and thermal conductivity of the substrate along a thickness direction at 200° C. is 80 W / mk or higher.