463results about "Nitrogen-metal/silicon/boron binary compounds" patented technology

The invention discloses a transition metal nitride and amorphous carbon composite coated and modified lithium manganese iron phosphate composite material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The vanadium nitride / amorphous carbon is adopted to perform composite coating modification on the lithium manganese iron phosphate material, so that the composite positive electrode material is more stable in structure. The use of vanadium nitride reduces the coating amount of carbon, and avoids the problems of coating layer thickening caused by high carbon content and Li < + > diffusion hindering caused by reduction of tap density of active substances. Vanadium nitride not only has good conductivity, but also has good Li < + > conductivity transmission performance, Li < + > de-intercalation can be rapidly achieved, the conductivity of the material is improved, meanwhile, a Li < + > diffusion channel on the surface of the positive electrode material is further dredged and increased, and the capacity loss of the modified material is reduced.

The invention relates to the technical field of gas purity detection, in particular to a gas source purity detection device and a gallium nitride production system. The gas source purity detection device comprises a main pipe body, a supporting piece, a control ring, a moving arm and a concentration sensor. The main pipe body is used for being connected with an air source pipeline. The control ring is rotationally matched with the supporting piece and driven by the driver, and the control ring and the outer wall face are rotationally sealed. A gas collecting groove is formed in the inner ring wall of the control ring. The supporting piece is provided with a mounting blind hole, and the moving arm is slidably matched with the mounting blind hole and is slidably sealed. A first elastic piece is connected between the moving arm and the hole bottom wall of the mounting blind hole in an abutting mode. The concentration sensor is arranged on the outer side wall of the moving arm. When the control ring rotates, the gas collecting groove can periodically communicate with the main pipe body and can also periodically move to the moving arm. The gas source purity can be continuously and accurately detected for a longer time, and automatic calibration is achieved while purity detection is conducted.

The invention relates to the technical field of accurate transmission control, in particular to a transmission device and a gallium nitride production system. In the transmission device, a transmission shaft is used for enabling a power output shaft of the driver to be in transmission connection with the main shaft body. And the transmission sleeve is in transmission fit with the transmission shaft and sleeves the transmission column. The first barrel and the second barrel are coaxially and fixedly connected, the inner spaces of the first barrel and the second barrel are communicated, and the first barrel is located at the end, close to the transmission column, of the second barrel. The first barrel is provided with internal threads. The rotating part is provided with an external thread, the rotating part is rotatably matched in the first barrel, and the rotating part and the first barrel are movably sealed. The rotating piece is connected with the transmission column. And the piston is in sliding fit in the second barrel. The pressure sensor is arranged on the inner side of the sealing plate, and a first elastic piece is connected between the pressure sensor and the piston in an abutting mode. The transmission precision can be calibrated as required according to the actual transmission situation, and the device can adapt to the situation that short-distance transmission and long-distance transmission are mixed.

The invention discloses a large-lamellar MXene material as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out etching treatment on an MAX phase material by using an etching agent to obtain a multi-layer MXene material; and dispersing the multi-layer MXene material in a dispersion medium, and carrying out mechanical stress shear stripping to obtain the large-lamellar MXene material. According to the preparation method provided by the invention, the large-lamellar MXene material with the average transverse size of 4.2 microns or above can be obtained through high-yield stripping, the product quality is high, the yield is high, and industrial batch production is facilitated; the MXene film obtained based on the large-lamellar MXene material has good electromagnetic shielding capability and can be widely applied to the field of electromagnetic absorption shielding.

The invention relates to the field of gallium nitride production, in particular to an airflow control valve and a horizontal gallium nitride production system. In the airflow control valve, a first temporary storage mechanism is used for temporarily storing gas in an upstream pipeline of a valve body. The second temporary storage mechanism is used for temporarily storing gas in a downstream pipeline of the valve body. The communicating mechanism is connected between the first temporary storage mechanism and the second temporary storage mechanism and used for selectively communicating the first temporary storage mechanism with the second temporary storage mechanism. The vibration detection mechanism is used for detecting the vibration condition of the communication mechanism when the first temporary storage mechanism communicates with the second temporary storage mechanism through the communication mechanism. According to the invention, independent detection and monitoring can be carried out on cavitation and vibration of valves in each gas path, so that personalized management is carried out for different gas paths and different valves, personalized management of gas path links is realized in a huge production equipment system, the safety of equipment operation is effectively guaranteed, and the production efficiency is improved. And the service life of the whole gas circuit can be prolonged.

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 is applicable to the technical field of electrode materials, and relates to a two-dimensional mesoporous nanosheet compound and a preparation method and application thereof, the compound comprises single-layer uniform spherical mesoporous structures which are regularly arranged on the two sides of an MXene nanosheet respectively, and the method comprises the following steps: (1) preparing a single micelle solution; (2) preparing an MXene-coated micro single micelle superstructure alcohol solution with the concentration of 2 to 5 mg / mL; (3) preparing a compound of the MXene coated micelle single micelle wrapped by the polydopamine; (4) preparing a two-dimensional mesoporous nanosheet compound constructed by a spherical mesoporous element; the invention also discloses an application of the two-dimensional mesoporous nanosheet compound in a battery. The two-dimensional mesoporous nanosheet compound and the preparation method thereof disclosed by the invention have the beneficial effects that the specific surface area of the two-dimensional mesoporous nanosheet compound is greatly increased, active sites of chemical reaction are increased, a better substance transmission channel can be provided, and the two-dimensional mesoporous nanosheet compound has rapid mass transfer kinetics; and the assembled aqueous zinc ion battery has relatively high specific discharge capacity and relatively stable long cycle performance.

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 discloses a composite lithium sulfide positive electrode material as well as a preparation method and application thereof, and belongs to the field of lithium-sulfur batteries. A carbon source and metal salt are subjected to a one-step calcination method, urea reacts with nickel salt and iron salt to generate a nickel nitride and iron nitride compound, glucose and urea generate nitrogen-doped multi-stage porous carbon under the action of a sodium chloride template, and a nickel nitride / iron nitride compound and a nitrogen-doped multi-stage porous carbon composite material are obtained and serve as precursor materials. The preparation method comprises the following steps: mixing lithium sulfide with N-methyl pyrrolidone to prepare lithium sulfide slurry; and immersing the prepared precursor material into the lithium sulfide slurry, and drying to obtain the composite lithium sulfide positive electrode material. Nickel nitride and iron nitride in the material are used as double catalysts and have a synergistic effect to accelerate the redox reaction of lithium sulfide / lithium polysulfide. In addition, the nitrogen-doped multi-stage porous carbon structure can effectively bear lithium sulfide and lithium polysulfide and relieve volume expansion.

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

The invention discloses a double transition metal doped graphene catalyst and application thereof, the double transition metal doped graphene catalyst is of a hexagonal crystal system structure, and the space group is P6 / mmm; the composition form of the active center is Cu2C3N3, Nb2C3N3, Ta2C3N3, Rh2C6, Rh2C3N3 and Rh2N6, the hydrogen evolution free energy of the active center is-0.03 eV,-0.09 eV, 0.10 eV, 0.12 eV,-0.21 eV and 0.06 eV respectively, the metal binding energy of the active center is-4.53 eV,-8.60 eV,-8.03 eV,-6.13 eV,-7.11 eV and-5.62 eV respectively, the metal forming energy of the active center is-0.54 eV,-1.94 eV,-0.06 eV,-0.64 eV,-1.62 eV and-0.13 eV respectively, and the active center has good catalytic activity, structural stability and preparation feasibility and is used for

The invention relates to the technical field of gas path pipe fittings, in particular to a gas path pipe fitting structure and a batch gallium nitride production system. The gas path pipe fitting structure comprises a main pipe body, a branch pipe, a partition plate, a first sliding piece, a second sliding piece and a driving rod. The branch pipes are communicated with the main pipe body. The branch pipe is divided into a first pipe cavity and a second pipe cavity by the partition plate. The driving rod is in sliding fit with the branch pipe. The first sliding piece is in sliding fit with the second pipe cavity and is in sliding sealing, the driving rod penetrates through the first sliding piece and is in sliding fit with the first sliding piece, and the second sliding piece is fixedly connected to the end of the driving rod. An air outlet is formed in the side wall of the second pipe cavity, and when the first sliding part is attached to the partition plate, the edge of the side, away from the main pipe body, of the air outlet is flush with the surface of the side, close to the main pipe body, of the first sliding part. The driving rod is driven by the first driver and can drive the second sliding piece into the main pipe body. The method can help to determine the health degree of the whole gas path, and is beneficial to improving the feed gas conveying accuracy.

The invention relates to the technical field of sealing, in particular to a sealing structure, a gallium nitride production reaction furnace and a horizontal gallium nitride production system. The sealing structure comprises a main pipe body, a protective ring, a guide pipe, a piston, a pressure sensor, a gas detection sensor and a data center. An air inlet flange is arranged at the air inlet end of the main pipe body. An annular groove is formed in the inner ring wall of the additional protection ring, the additional protection ring is arranged on the air inlet flange in a sleeving mode, the sealing face of the air inlet flange is arranged corresponding to the annular groove, and sealing treatment is conducted between the additional protection ring and the air inlet flange. One end of the guide pipe is fixedly connected with the protective ring and communicated with the annular groove, and the guide pipe is arranged in the axial direction of the main pipe body. The piston is in sliding fit in the guide pipe. The side, away from the protective ring, of the piston is fixedly connected with a piston rod. The pressure sensor is used for detecting the air pressure in the annular groove, and the gas detection sensor is used for detecting whether corresponding gas exists in the annular groove or not. And the pressure sensor and the gas detection sensor are electrically connected with the data center. The sealing effect can be monitored in real time.

The invention relates to the technical field of environmental restoration, in particular to a core-shell structure nitrided zero-valent iron material obtained through gas-phase thermochemical synthesis as well as a preparation method and application of the core-shell structure nitrided zero-valent iron material. The invention provides a core-shell structure nitrided zero-valent iron material prepared through gas-phase thermochemical synthesis. The core of the core-shell structure nitrided zero-valent iron material is zero-valent iron, and the shell of the core-shell structure nitrided zero-valent iron material is Fe4.4N; the content of zero-valent iron is 60-70wt% based on the mass of the nitrided zero-valent iron material with the core-shell structure. According to the core-shell structure nitrided nano zero-valent iron material obtained through gas-phase chemical thermal synthesis, zero-valent iron is used as a core, and Fe4.4N is used as a shell; the obtained core-shell nitrided nano zero-valent iron material has a more stable surface iron-nitrogen compound, has higher electronic efficiency, and can overcome the problem of rapid passivation of nano zero-valent iron in the repair process.

The invention discloses a nitride Ta3N5 and a preparation method and application thereof.The specific method comprises the steps that a precursor I is subjected to pyrohydrolysis, TaOx with the small size is prepared, the nitride Ta3N5 can be prepared after short-time nitridation by means of the characteristics that TaOx is amorphous and small in particle radius, generation of low-valence metal defects is effectively reduced, the charge separation efficiency is improved, and the method is suitable for industrial production. The Ta3N5 shows water decomposition activity in a photocatalytic water decomposition reaction, and the activity of the Ta3N5 is obviously improved compared with that of Ta3N5 prepared by a conventional method.

Provided is at least one of a high gallium nitride sintered body that is less subject to increases in oxygen content caused by re-oxidation after sintering than known gallium nitride sintered bodies obtained by the hot pressing process, a method for producing the gallium nitride sintered body, or use of the gallium nitride sintered body. The gallium nitride sintered body comprises a surface layer having a higher density than an inner portion of the sintered body. The atomic mass ratio of gallium to the sum of gallium and nitrogen is more than 0.5 and 0.60 or less.

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 composite hydrogen storage material as well as a preparation method and application thereof, and belongs to the technical field of hydrogen storage materials and preparation thereof. The problems that an existing aluminum hydride composite hydrogen storage system is too much in additive dosage, poor in low-temperature kinetics and the like are solved. According to the invention, the rare earth nitride is used as an additive, the multivalent characteristic of the rare earth element is used as an active center, and the nitrogen element has an attraction effect on negative hydrogen, so that the dissociation and transmission of hydrogen are accelerated; the rare earth element can perform electron transmission with aluminum hydride by taking a nitrogen active site as a bridge, so that a synergistic effect between the rare earth element and the aluminum hydride is realized, the affinity of the rare earth element and a hydrogen element is enhanced through an electron donating effect of the nitrogen element, the dehydrogenation temperature of the aluminum hydride material is reduced, and meanwhile, the dehydrogenation kinetics of a low-temperature region of the aluminum hydride material is also improved. In addition, the preparation process of the composite hydrogen storage material is simple and mature, raw materials are cheap and easy to obtain, and large-scale industrial production is facilitated.

The invention discloses a molybdenum nitride quantum dot / two-dimensional layered nitrogen carbide composite material as well as preparation and application thereof in lithium-sulfur battery diaphragm modification, MoNQDs and two-dimensional layered NC are combined in situ, MoNQDs provide a large number of active sites for anchoring and catalyzing polysulfide, the excellent intrinsic electron activity of MoNQDs can accelerate conversion of polysulfide, and therefore, the molybdenum nitride quantum dot / two-dimensional layered nitrogen carbide composite material can be applied to lithium-sulfur battery diaphragm modification. And meanwhile, the NC surface structure can be regulated and controlled so as to greatly improve the carrier migration rate. The MoNQDs / NC is used as a diaphragm modified material for preparing the modified diaphragm for the lithium-sulfur battery, so that excellent rate capability and cycle performance can be realized, and the surface capacity higher than that of the current commercial lithium ion battery is realized under the condition of high sulfur load.

The invention discloses a preparation method of a composite material, the composite material, a photoelectric device and a display device. The preparation method of the composite material comprises the following steps: providing a precursor solution, wherein the precursor solution comprises Mxene, a metal cation source and a first solvent; carrying out hydrothermal treatment to obtain an inorganic semiconductor particle / Mxene composite material solution; the inorganic semiconductor particle / Mxene composite material solution is subjected to microwave treatment, the composite material is obtained, and the composite material comprises inorganic semiconductor particles and Mxene quantum dots. According to the preparation method of the composite material, the inorganic semiconductor particles and the Mxene quantum dots have relatively strong electric field stability, so that the photoelectric device comprising the inorganic semiconductor particles and the Mxene quantum dots has relatively good luminescence performance.

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.

The present invention provides a method for preparing lithium sulfide, the method comprising the following steps: (1) preparing lithium nitride by reacting cheap nitrogen with metallic lithium in the presence of an inert atmosphere or under vacuum conditions, and controlling the residual amount of metallic lithium in the lithium nitride to be within a preset safety threshold; (2) mixing the lithium nitride obtained in step (1) with elemental sulfur in a certain proportion to react and obtain lithium sulfide. The present invention adopts a two-step method to prepare lithium sulfide, which has the following advantages: 1. The two-step method avoids the danger of explosion caused by violent reaction by directly mixing metallic lithium and elemental sulfur using a high-temperature melting method, and safety is guaranteed; 2. Lithium nitride is prepared using cheap nitrogen, which can be mass-produced and all processes do not require high-temperature treatment, with low energy consumption and obvious low-cost advantages; 3. In the preparation process of lithium sulfide, nitrogen is released, hydrogen is not used, and no dangerous gases such as hydrogen sulfide are generated, which is green, safe and environmentally friendly.

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.

Provided are β-cyc-assisted synthesis of an In-V group quantum dot, and a synthesis method therefor and the use thereof. The method for β-cyc-assisted synthesis of an In-V group quantum dot comprises: preparing a β-cyc-containing precursor solution of an In source and a V group element source, and subjecting it to a hydrothermal reaction; extracting a stock solution after the hydrothermal reaction by using an organic solvent; removing β-cyc from the stock solution, washing same with water and then extracting same; and heating and concentrating same to obtain a high-concentration In-V group quantum dot solution. With regard to the β-cyc-assisted synthesis of an In-V group quantum dot, the In-V group quantum dot synthesized with the assistance of β-cyc is prepared by using the method for β-cyc-assisted synthesis of an In-V group quantum dot. The use of β-cyc-assisted synthesis of an In-V group quantum dot is the use of the β-cyc-assisted synthesis of an In-V group quantum dot in the field of photovoltaics, and the field of photovoltaics comprises solar cells, photoelectrochemical hydrogen production and photoelectric detectors. Compared with traditional synthesis methods, this synthesis method has the advantages of green and environmentally friendly raw materials, a simple and safe process, a simple and convenient device, efficient and economic synthesis, and being low cost.