28results about "Nitrogen-metal/silicon/boron binary compounds" patented technology

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.

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.

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.

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.

This method for producing ammonia includes: a step for reacting an alkali metal with an aromatic hydrocarbon compound that has an unsubstituted aromatic ring or an aromatic ring substituted with a hydrocarbon group or an alkoxy group in at least one organic solvent that is selected from the group consisting of a cyclic ether solvent and an alkyl ether solvent so as to obtain a compound (A) that is composed of an alkali metal cation and a radical anion of the aromatic hydrocarbon compound; a step for reacting nitrogen with the compound (A) so as to obtain a metal nitride; and a step for reacting the metal nitride with water or an acidic aqueous solution so as to obtain ammonia or ammonium ions.

MXene-coated antennas, and associated devices and methods of manufacture, are described herein. In one aspect, an antenna may include an antenna body, where the antenna body has a coated region with a MXene film conformally coated thereon. The implementation of MXene-based waveguide components provides an example of a facile, convenient realization of 3D-printed polymer devices with performance levels as high as metallic waveguides. The waveguide and other conductive components can be additively manufactured using commonly available 3D printers and commercially available polymers. Dip-coating of MXene provides a general solution for realizing geometrically complex metal-like 3D structures. The disclosure provides herein the implementation of thru, bent, twisted, and discontinuous filtering waveguides, each of which can be utilized to manipulate the propagation of electromagnetic waves.

The invention relates to a method of fabrication of a suspension of a compound with the general formula Mn+1Xn in the form of flakes of length L (or lateral size) comprised between 1 and 15 micrometers and of thickness (or height H) comprised between 1 and 20 nanometers, which is essentially characterized in that same is fabricated from a MAX phase compound with the general formula Mn+1AXn, and in that said method comprises at least the following successive steps: - at least two successive chemical attacks of said MAX phase compound, each chemical attack being carried out with an aqueous solution containing hydrochloric acid at a molar concentration strictly greater than 6M mixed with either only lithium fluoride at a molar concentration strictly greater than 1M, or lithium fluoride and hydrofluoric acid, - a first series of wash cycles using deionized and deoxygenated water, each of the wash cycles comprising the addition of a volume V1 of deionized and deoxygenated water with stirring to obtain an equivalent molar concentration of Mn+1Xn which is strictly less than 015M, followed by a centrifugation at more than 1681 rcf and the removal of the supernatant, - a second series of wash cycles using deionized and deoxygenated water, each of the wash cycles comprising the addition of a volume V2 of deionized and deoxygenated water with stirring to obtain an equivalent molar concentration of Mn+1Xn strictly less than 0.05M, followed by centrifugation at more than 1681 rcf and by the removal of the supernatant.

The application discloses a method for preparing two-dimensional metal nitride by using bulk metal oxide powder, which comprises the following steps: 1) uniformly mixing and grinding metal oxide powder with alkali metal carbonate or alkali metal hydroxide; adding neutral alkali metal or alkali earth metal halide salt, and uniformly mixing and grinding again; 2) performing heat preservation reaction on the mixture obtained in the step 1) under ammonia atmosphere, and cooling; 3) performing acid washing on the reaction product obtained in the step 2), washing to neutral, performing suction filtration and centrifugation, and drying, so as to obtain two-dimensional metal nitride in nanosheet shape. The application firstly proposes a method for preparing two-dimensional metal nitride nanosheet by using alkaline-neutral mixed double salt as an auxiliary, and the alkali metal carbonate or alkali metal hydroxide is used as a reactant to synthesize an intermediate of alkali metal oxide with two-dimensional layer-like structure, and the neutral alkali metal or alkali earth metal halide salt is used as a molten salt auxiliary agent to promote the nitridation conversion of the alkali metal oxide. The method is suitable for preparing two-dimensional niobium nitride by using bulk niobium oxide, two-dimensional tungsten nitride by using bulk tungsten oxide, and two-dimensional molybdenum nitride by using bulk molybdenum oxide, and is related to a simple process and low cost.

Provided is an ammonia decomposition catalyst which exhibits high ammonia decomposition activity even at a low reaction temperature and a low reaction pressure, and which has stable catalytic properties such that it can be repeatedly used in reactions even after being exposed to air or water. A barium nitride of the present invention is represented by the following general formula (1): BaAN2-x (1), wherein in general formula (1), A represents at least one element selected from the group consisting of Si, Fe, Ni, Mo, and Zr, and x represents a value expressed by 0 ≤ x < 2.0.

This invention relates to the field of electrocatalytic materials technology, specifically to a metastable transition metal nitride composite electrocatalyst synthesized by morphology-mediated magnetothermal synthesis, its preparation method, and its application. The key technical points are: pretreatment of a conductive metal substrate; growth of a metal oxide nanoarray with a pointed structure on the surface of the pretreated conductive metal substrate via hydrothermal method and low-temperature air annealing to obtain a morphology-mediated substrate; immersion of the morphology-mediated substrate in a mixed solution of multiple transition metal salts, followed by drying to form a conformal coating on the surface of the nanoarray, resulting in a nanoarray substrate with a metal precursor conformal coating; and placement of the nanoarray substrate with the metal precursor conformal coating in an alternating magnetic field for rapid magnetothermal nitriding treatment in a nitrogen-containing atmosphere to obtain the composite electrocatalyst, achieving a significant improvement in OER activity and stability.

This invention discloses a Co-doped carbon nanocage material (labeled VN / Mo2C / Co-NC) with a VN / Mo2C heterostructure loaded on its surface, its preparation method, and its application in lithium-sulfur batteries. The specific surface area of ​​the VN / Mo2C / Co-NC material is 151.03 m². 2 g⁻ 1 The material has a size of 200-250 nm. The preparation process of this VN / Mo2C / Co-NC material is as follows: surface coating of CoZn-ZIF material, followed by high-temperature carbonization to obtain Co-doped carbon nanocages (labeled Co-NC); and loading a VN / Mo2C heterostructure catalyst onto the Co-NC surface. VN / Mo2C / Co-NC can achieve highly efficient catalytic conversion of polysulfides. A battery separator modified with VN / Mo2C / Co-NC material is labeled VN / Mo2C / Co-NC@PP. The lithium-sulfur battery using the VN / Mo2C / Co-NC@PP modified separator exhibits excellent comprehensive performance, especially due to the high catalytic activity of the VN / Mo2C heterostructure in this material for polysulfides, which effectively suppresses the shuttle effect of polysulfides, thus endowing the lithium-sulfur battery with excellent long-cycle stability and high-rate performance, meeting the performance requirements of energy storage or power batteries.

This application relates to a method for recycling and reusing gallium oxide single crystal scrap. The method employs a "surface impurity removal-high-temperature nitriding" process to convert gallium oxide single crystal scrap into high-value-added gallium nitride powder. Specifically, the surface-removed gallium oxide single crystal scrap is first preheated in an inert gas atmosphere to remove adsorbed oxygen, water, and crystal water from its surface, thereby reducing side reactions during the subsequent nitriding process. Subsequently, an ammonia atmosphere is used for calcination, allowing the gallium oxide to undergo a nitriding reaction in the ammonia atmosphere, transforming it in situ into gallium nitride powder. This method not only achieves efficient resource utilization and high-value utilization of gallium oxide single crystal scrap, significantly enhancing its economic value, but also provides a practical, green, and low-carbon disposal path for the large amount of single crystal scrap generated by the future large-scale development of the gallium oxide wafer industry, effectively filling the current technological gap in the field of gallium oxide single crystal scrap recycling and reuse.

The application relates to a core-shell structure silicon nitride / silicon nitride magnesium powder and a preparation method and application thereof, and belongs to the technical field of structural ceramic materials. The method comprises the following steps: providing silicon nitride powder, performing oxidation pretreatment to obtain silicon nitride pretreated powder with an oxidation film layer on the surface; providing magnesium powder, heating to form magnesium vapor, and placing the silicon nitride pretreated powder in a mixed atmosphere comprising nitrogen and the magnesium vapor to perform high-temperature sintering reaction, so as to obtain a composite powder; and performing residual magnesium removal treatment on the composite powder, and performing calcination to obtain the core-shell structure silicon nitride / silicon nitride magnesium powder. The core-shell structure silicon nitride / silicon nitride magnesium powder takes silicon nitride as a core and silicon nitride magnesium as a shell, has the advantages of promoting low-temperature high-density sintering of silicon nitride, improving ceramic purity and performance, and is suitable for fields of aerospace engine components, precision mechanical shaft pumps, cutting tools, biomedical implants and electronic packaging thermal management materials.

This invention proposes a MoTe2-MoN composite hard carbon material, its preparation method, and its applications, belonging to the technical field of sodium-ion battery electrode materials. This invention achieves in-situ simultaneous synthesis of MoTe2-MoN composite hard carbon material via low-temperature solution mixing, freeze-drying, and one-step controlled atmosphere calcination. This method is simple, low-cost, safe, and environmentally friendly. In the prepared composite material, MoTe2 nanoribbons and MoN nanosheets grow uniformly and interlaced on a carbon framework, constructing a tightly connected heterogeneous interface. The built-in electric field induced by this heterogeneous interface accelerates charge transport kinetics, improves the reaction rate, and enhances cycle stability, making it an ideal high-performance anode material for sodium-ion batteries.

This utility model relates to the field of silicon carbide square beam compressive strength testing technology, specifically a pretreatment device for silicon nitride-bonded silicon carbide raw materials used in the synthesis of silicon nitride-iron raw materials. It includes: a support frame, with a mounting plate fixedly connected to the top of the support frame; the side surface of the mounting plate is fixedly connected to the inner surface of a hopper support; and a raw material hopper is provided on the top of the hopper support. The beneficial effects are as follows: the pretreatment device for silicon nitride-bonded silicon carbide raw materials used in the synthesis of silicon nitride-iron raw materials proposed in this utility model uses a support frame with the bottom surface of the mounting plate fixedly connected to the top, and then the hopper support supports the raw material hopper. The bottom surface of the conveying device is fixedly connected to the top surface of the mounting plate, and a conveying device is provided on the top surface of the mounting plate. When raw materials are added to the raw material hopper, they are screened by a screening device. The screened raw materials fall onto the top of the conveying device, thus being transported by the conveying device.

The present invention relates to a carbon composite material for use in a positive electrode of a lithium-sulfur battery, the carbon composite material including a porous carbon material; and vanadium nitride particles formed on a surface of the porous carbon material. A lithium-sulfur battery using the carbon composite material has improved stability by rapidly converting lithium polysulfide into lithium sulfide.

An animal-derived polymer dot is provided, which comprises a carbon dot represented by Formula (1): CxOyNz (1), wherein C is carbon, O is oxygen, and N is nitrogen; x, y, and z represent atomic percentages and satisfy the following condition: 55≤x≤75, 15≤y≤35, 10≤z≤30, and x+y+z=100. The carbon dot is obtained from an animal-derived material. A method for preparing the animal-derived polymer dot comprises: adding an animal-derived material into water to form an aqueous solution; and heating the aqueous solution to obtain the animal-derived polymer dot. Also provided is a use of the animal-derived polymer dot in the manufacture of a composition for at least one of anti-inflammatory and anti-oxidant purposes.

The present application relates to a kind of tantalum nanomaterial and its preparation method and application in bone defect repair. Specifically, the present application relates to a kind of tantalum nanomaterial, the tantalum nanomaterial includes hollow nanosphere skeleton and the Ta-N4 single-atom coordination structure formed on its surface.The tantalum nanomaterial of the present application can promote the repair of bone defect, and has good biocompatibility at cell and animal level, has very good commercial value and social benefits.

The application belongs to the technical field of two-dimensional material preparation, and relates to a two-dimensional transition metal compound and a preparation method and application thereof, and the preparation method comprises the following steps: 1) grinding molybdenite into micron-sized mineral powder; 2) mixing the micron-sized mineral powder with a chlorine salt, and performing high-temperature molten salt reaction under a reaction atmosphere and then cooling to room temperature to obtain a reaction product; and 3) washing and drying the reaction product to obtain molybdenum nitride or molybdenum phosphide. The application realizes efficient conversion from a bulk layered transition metal sulfide to a two-dimensional transition metal compound nanosheet by using the fluxing, intercalation and exfoliation effects of molten chlorine salt; different two-dimensional molybdenum-based nitrides or phosphides of different phases can be selectively prepared by adjusting the reaction temperature and chlorine salt composition; the method has simple synthesis process, controllable cost and high production efficiency, and the by-product salt after the reaction is easy to recycle and reuse, and belongs to a green and industrialized two-dimensional material preparation process, and has wide popularization and application prospects.

Methods for modifying the surface termination of two-dimensional (2D) transition metal carbides (MXenes) are provided. The methods, which allow for versatile chemical modification of the terminating anions via halide exchange or substitution and elimination reactions in molten inorganic salts, provide a processing approach that is widely applicable to MXenes as a broad class of functional materials.

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.

This invention belongs to the field of electrocatalytic materials technology, specifically relating to a fullerol-modified nanoarray electrode material, its preparation method, and its application. This invention obtains fullerol-modified copper hydroxide nanomaterials by modifying the surface of a copper hydroxide nano-precursor material with fullerol, and finally, through a high-temperature gas-solid conversion reaction, obtains fullerol-modified copper-based compound nanomaterials. On the one hand, fullerol modulates the electronic structure of the copper-based material, thereby increasing the catalytic activity of Cu. + The species remain stable during the cathode electroreduction process; on the other hand, the fullerol's rich-OH groups can effectively regulate the interfacial water structure, reconstruct the hydrogen bond network, and promote water dissociation to generate active hydrogen. Benefiting from these advantages, the material prepared in this invention not only exhibits excellent electrocatalytic activity and selectivity in the field of electrocatalytic nitrate reduction to ammonia, but also demonstrates good long-term operational stability, providing a high-performance, low-cost electrocatalytic material solution for green ammonia synthesis technology.

This invention discloses an integrated continuous magnesium nitridation hydrolysis ammonia supply system and method, relating to the fields of new energy and ammonia energy. The system includes a high-temperature reaction unit, a continuous hydrolysis reaction unit, and a waste recovery unit. The high-temperature reaction unit is used for the nitridation reaction of magnesium powder and nitrogen gas, and unreacted nitrogen gas is condensed and refluxed to participate in the nitridation reaction again. The continuous hydrolysis reaction unit is used to receive the magnesium nitride generated by the nitridation reaction, drive the magnesium nitride to flow and contact the sprayed reaction liquid to undergo a hydrolysis reaction, generating ammonia gas and reaction byproducts. The waste recovery unit is used to clean and collect the reaction byproducts flowing within the hydrolysis reaction unit. This invention has a reasonable structure; the reaction process in the metal nitridation and hydrolysis ammonia production system is controllable, the reaction is continuous, the products are easy to recover, the ammonia is easy to store, and maintenance time is short.

A high-quality nitride crystal can be produced efficiently by charging a nitride crystal starting material that contains tertiary particles having a maximum diameter of from 1 to 120 mm and formed through aggregation of secondary particles having a maximum diameter of from 100 to 1000 μm, in the starting material charging region of a reactor, followed by crystal growth in the presence of a solvent in a supercritical state and / or a subcritical state in the reactor, wherein the nitride crystal starting material is charged in the starting material charging region in a bulk density of from 0.7 to 4.5 g / cm3 for the intended crystal growth.

This application relates to a uniformly doped rod-shaped gallium nitride powder and its preparation method. The gallium nitride powder has a regular morphology, uniform size, high purity, and high crystallinity, and can be used as a key functional material for high-end optoelectronic devices, power semiconductors, and advanced packaging. The method uses metallic gallium as raw material and introduces dopant simultaneously during the hydrothermal synthesis of gallium oxyhydroxide precursor, so that the target element is embedded in situ during the lattice construction stage, achieving atomic-level uniform bulk doping. This fundamentally avoids the problems of uneven doping, "doped islands," concentration gradients, and surface enrichment caused by traditional post-doping methods. The obtained precursor is directly converted into uniformly doped rod-shaped gallium nitride powder by a one-step high-temperature nitridation. This process is short, simple to operate, and environmentally friendly, effectively solving the problems of uneven doping, poor crystallinity, severe agglomeration, and complex processes in the prior art, and providing an efficient and scalable technical path for the controllable preparation of high-performance gallium nitride powder.