51 results about "Nickel carbide" patented technology

The invention relates to a magnetic core-shell nanometer composite material with nickel particles and a preparation method and application of the magnetic core-shell nanometer composite material. The composite material comprises magnetic cores and carbonized shells, wherein the magnetic cores are coated with the carbonized shells with the nickel particles. The portion between each magnetic core and the corresponding carbonized shell is coated with a silica inner shell. The preparation method of the composite material comprises the following steps that firstly, the magnetic cores coated with silica layers are dispersed in an alkaline alcohol-water system, then added into a precursor solution of synthetic phenolic resin mixed with nickel salt, and the magnetic cores coated with phenolic resin layers are obtained after reaction, wherein the phenolic resin layers are doped with nickel ions; secondly, the magnetic cores coated with the phenolic resin layers are subjected to heat preservation and calcination in an inert environment, and the magnetic core-shell nanometer composite material with the nickel particles is obtained. The composite material has the advantages of being high in magnetism, good and stable in morphology and structure, good in adsorption and catalytic functions and the like, and the composite material is especially used in a catalytic reduction reaction of an aromatic nitro compound.

The invention provides a Ni3ZnC0.7@C one-dimensional porous nanocomposite and a preparation method thereof and application in water electrolysis. The one-dimensional novel zinc-nickel carbide/graphitecarbon porous nanocomposite (Ni3ZnC0.7@C) is obtained through simple one-step solid-state pyrolysis in an inert atmosphere by taking organic molecule-intercalated layered nickel-zinc hydroxides as single precursors. The Ni3ZnC0.7@C porous nanorods have the structural characteristics of the uniform morphology, the uniform particle size, the high dispersion, the high crystallization degree, the large specific surface area, the high interfacial interaction and the like. When the prepared Ni3ZnC0.7@C porous nanorods are applied to catalytic water electrolysis hydrogen production, the Ni3ZnC0.7@Cporous nanorods show the high catalytic activity, the overpotential can be as low as 151 mV(i=10 mA/cm<2>), and meanwhile the Ni3ZnC0.7@C porous nanorods have the excellent stability (the testing performance keeps 98% or above in 10 h) and the high corrosion resistance.

The present invention relates to polycrystalline silicon chunks which are cubic and have a metal content of less than 200 pptw and a dopant content of less than 50 ppta. Methods for producing polycrystalline silicon chunks, include the steps of providing a polycrystalline silicon rod, comminuting the polycrystalline silicon rod into cubic chunks, and cleaning the polycrystalline silicon chunks, wherein comminution takes place using a spiked-roll crusher having at least one spiked roll, the spiked roll including W₂C phases or WC phases with 0.1-10% of a metal carbide selected from the group consisting of titanium carbide, chromium carbide, molybdenum carbide, vanadium carbide, and nickel carbide or consisting of steel with 1-25% W.

The invention provides a macroporous carbonized nickel catalyst, and a preparation method and application of the macroporous carbonized nickel catalyst. The macroporous carbonized nickel catalyst is prepared by using a carboxylic acid-modified polymethyl methacrylate microsphere as a template and nickel nitrate as a precursor; the pore diameter of macroporous carbonized nickel is within the range of 50-1000 nm. The preparation method of the macroporous carbonized nickel comprises the following steps: adding the nickel nitrate into a methanol/ethylene glycol mixed solution, wherein the molar ratio of the methanol to the ethylene glycol is 1: (1-3) preferably; stirring to obtain a nickel nitrate solution; adding the carboxylic acid-modified polymethyl methacrylate microsphere into the obtained nickel nitrate solution for dipping; filtering; drying; heating up to 400-750 DEG C; performing heat preservation for 4-8 hours to obtain the macroporous carbonized nickel; preferably, the volume ratio of the methanol to the ethylene glycol is 1: (2-4). According to the invention, the carboxylic acid-modified microsphere is used as the template, the nickel nitrate is used as the precursor, and direct roasting is carried out under the condition of the methanol/ethylene glycol mixed solution to prepare the three-dimensionally communicated carbonized nickel; the operation method is simple, the period is short and the cost is low.

The invention discloses a preparation method of a phosphorus-doped cadmium sulfide supported nickel carbide quantum-dot nanorod photocatalyst. The preparation method includes the steps of 1) mixing CdS nanorods and NaH2PO2, heating the mixture in N2 atmosphere to obtain phosphorus-doped CdS nanorods; 2) dissolving the phosphorus-doped CdS nanorods in N,N-dimethylformamide, adding Ni(NO3)2 6H2O and2-methylimidazole, and stirring at room temperature to obtain a precursor material; 3) heating the precursor material of the step 2), holding the temperature, cooling to room temperature, washing with deionized water and ethanol to obtain a black-green product, and drying the black-green product to obtain the phosphorus-doped cadmium sulfide supported nickel carbide quantum-dot nanorod photocatalyst. The photocatalyst prepared via the preparation method has good stability and high visible light catalytic activity, and the preparation method is simple.

The invention discloses a device and method for plasma enhanced atomic layer deposition of a nickel carbide film. A carrier gas cylinder, a hydrogen cylinder, an AMD-Ni monomer cylinder, a DAD-Ni monomer cylinder, a heating furnace, a mechanical pump and a radio frequency power source; the AMD-Ni monomer cylinder and the DAD-Ni monomer cylinder are placed in a heating sleeve; a heating strip is wound on the inner wall of the heating sleeve; a reaction cavity is arranged in the heating furnace; a substrate table is placed in the reaction cavity, and is internally provided with a thermocouple; agas outlet of the carrier gas bottle is connected with a mass flow controller I, a flow controller II and a flow controller III; an outlet of the flow controller I is sequentially connected with an ALD valve I and an inlet of the AMD-Ni monomer cylinder; an outlet of the flow controller II is sequentially connected with an ALD valve II and an inlet of the DAD-Ni monomer cylinder; and an outlet ofthe flow controller III is sequentially connected with an ALD valve III and a port I of a three-way valve.

The invention discloses a preparation method for implementing an electron field emission device by use of graphene. The preparation method comprises the following steps: (1) pretreatment: conducting RAC cleaning on a silicon chip; (2) silicon tip preparation: preparing a silicon tip according to a silicon processing technology, wherein the silicon tip is taken as a mould for preparation of a graphene tip; (3) chemical nickel-plating: putting the silicon tip into a surfactant for infiltration, and conducting chemical nickel-plating on the infiltrated silicon tip; (4) hydrothermal polyatomic alcohol carburization: putting the silicon chip with the nickel-plated silicon tip into a hydrothermal reaction kettle for hydrothermal carburization, wherein the hydrothermal reaction kettle is filled with a polyatomic alcohol and a sodium salt catalyst; (5) annealing: annealing the silicon tip containing nickel carbide in a tube furnace, so as to form a graphene coated nickel-plated silicon tip. Compared with the prior art, the preparation method overcomes the defects that graphene formed in a silicon tip according to a cataphoresis technology is low in adhesivity, and that the process of graphene growth according to the chemical vapor deposition method is complex and high in cost; through adoption of the preparation method, a plurality of layers of graphene can be formed on the surface of the silicon tip; the preparation method is environmentally friendly, easy and feasible, low in cost and the like.

The invention relates to a method for preparing an anode material of an S-Ni3C/NiO composite lithium-sulfur battery. The method comprises the steps of: firstly preparing a nickel-based metal organic frame (Ni-BTC), then using the nickel-based metal organic frame to prepare nickel carbide/nickel oxide (Ni3C/NiO), and then preparing an S-Ni3C/NiO composite material by compounding the nickel carbide/nickel oxide with sulfur to serve as the anode material of the lithium-sulfur battery. A hollow spherical structure ensures full contact between electrolyte and active substances to provide more oxidative active sites, the nickel oxide with higher specific capacity is obtained at high current density to cooperate with the nickel carbide to improve the electrochemical performance of the lithium-sulfur battery together.

The invention relates to a photocatalytic material, particularly to a metallic nickel carbide/carbon nitride nanosheet photocatalytic material, a preparation method and application thereof, and belongs to the technical field of nano materials and hydrogen production by water photolysis. In a nitrogen atmosphere, nickel acetylacetonate is subjected to low-temperature pyrolysis in olefinic amine toprepare high-quality Ni3C nanoparticles, and on the basis, a novel Ni3C/2D g-C3N4 nano heterojunction is successfully synthesized by adopting a simple two-step method, wherein the hydrogen productionperformance is obviously improved compared with the hydrogen production activity of single two-dimensional carbon nitride.

The invention provides a method for growing a heterojunction in a silicon microchannel plate in the technical field of microelectromechnical systems. The method comprises the following steps: S1, immersing the silicon microchannel plate into a surfactant to eliminate air in a silicon microchannel and activate silicon, and then putting the silicon microchannel plate into a chemical nickel-plating solution to plate porous nickel; S2, putting a nickel plated silicon microchannel plate into a polyalcohol mixed with a sodium salt catalyst for ultrasonic processing and then performing a solvent thermal reaction to form a nickel plated silicon microchannel plate having an inner wall coated by a nickel carbide; S3, then annealing to obtain a nickel plated silicon microchannel plate having the inner wall coated by graphene; and S4, putting the nickel plated silicon microchannel plate having the inner wall coated by the graphene into a sulfur source and molybdenum source mixed solvent for a heating reaction to form a nickel plated silicon microchannel plate having the inner wall coated by a molybdenum disulfide/graphene heterojunction. According to the method provided by the invention, through chemical nickel plating, solvent thermal carburization and hydrothermal synthesis performed step by step, the heterojunction can be grown in the silicon microchannel; and the method is environment-friendly, simple to operate and low in cost.

The invention belongs to the field of materials, and particularly discloses an angstrom-level transition metal carbide and a preparation method thereof. The angstrom-level transition metal carbide is prepared according to the following technical scheme: preparing a transition metal precursor into a solution, then adding with ion exchange resin as a carbon source, mixing and stirring, then separating the solid and liquid phases, collecting the solid phase, and finally drying and roasting the solid phase so as to obtain the angstrom-level transition metal carbide. The transition metal carbide takes carbon as a base body, and comprises one or more of tungsten carbide, molybdenum carbide, zinc carbide, chromium carbide, nickel carbide, ferrum carbide, cobalt carbide and titanium carbide.

The invention provides a nickel-modified molybdenum carbide catalyst and a preparation method thereof, and applications of the nickel-modified molybdenum carbide catalyst in a reaction for preparing ethanol by hydrogenating carbon dioxide. According to the invention, based on good hydrogenation capability of nickel and good carbon dioxide activation capability of molybdenum carbide, the nickel carbide composite bimetallic catalyst has the characteristics of high selectivity and high activity in comparison with a non-noble metal catalyst, and has the characteristics of low price and simple preparation in comparison with a noble metal catalyst.

The invention discloses a ceramic piston rod, which is formed by spraying a ceramic coating on the surface of a piston rod body, wherein signal grooves with equal thread intervals are machined in thesurface of the piston rod body below the ceramic coating to form a detection section, a 45-degree chamfer is expanded outside the opening of the signal groove, the width of the chamfer is 1/6 of the width of the groove opening, the ceramic coating sprayed in the signal groove is flush with the surface of the ceramic coating outside the groove to form an integral whole, the ceramic coating is provided with a bottom layer and a surface layer, the bottom layer is made of nickel carbide, the thickness of the bottom layer is greater than 150 micrometers, the surface layer is made of Cr2O3-TiO2, andthe thickness of the surface layer is greater than 200 micrometers. According to the ceramic piston rod provided by the invention, the comprehensive performance of the ceramic piston rod is improvedby optimizing the surface ceramic coating and the spraying process of the ceramic piston rod.

The invention discloses preparation and an application of a bimetallic organic framework composite nitrogen-doped graphene catalytic material. The preparation method comprises the following steps: by taking methanol as a solvent, adding nickel acetate tetrahydrate, cobalt nitrate hexahydrate and graphene into a methanol solution in proportion, uniformly stirring, slowly adding a small amount of dimethylimidazole for multiple times, continuously stirring, transferring a product into a refrigerator to induce precipitation after the reaction is complete, filtering, respectively washing with distilled water and ethanol, drying in vacuum to obtain a solid purple powder, and calcining by adopting temperature programming to obtain a MOF-derived cobalt nickel carbide/nitrogen-doped graphene composite catalytic material. The obtained composite catalytic material is high in specific surface area and extremely good in dispersity of metal particles, guarantees high catalytic activity, and shows excellent alcohol oxidation activity in a 1.0 M methanol and 0.5 M sulfuric acid mixed solution with the sweeping speed of 30 mV/s. The material can still keep 78.3% of the initial value after 1000 cycles, and shows very good stability.

The invention provides a carbon-coated nickel carbide and nickel nano composite material as well as a preparation method and an application thereof. The preparation method comprises the following steps: mixing a nickel source, nitrogen-free organic carboxylic acid and alkali metal salt to prepare a precursor; and pyrolyzing the precursor in an inert atmosphere to obtain a nano composite material; wherein the pyrolysis temperature ranges from 345 DEG C to 365 DEG C. According to the method, the composite material can be prepared in a green, simple and efficient mode by adopting a method of pyrolyzing the metal salt precursor and strictly and accurately controlling reaction conditions, the utilization rate of nickel and carboxylic acid ligands in the precursor preparation process can reach 100%, waste water containing heavy metal is not generated, and the method is suitable for large-scale industrial production.

The invention provides a carbon-coated nickel carbide nano composite material and a preparation method and an application thereof, the nano composite material comprises a core-shell structure with a shell layer and an inner core, the shell layer is a graphitized carbon layer doped with oxygen and nitrogen, the inner core is nickel carbide nano particles, and based on the total mass of the nano composite material, the nitrogen content is 0.5%-8%. According to the method, the nano composite material with nickel carbide coated with a graphitized carbon layer is obtained by adopting a method of pyrolyzing a metal salt precursor and accurately controlling reaction conditions, the method is simple in process and low in cost, and the obtained material has a good application prospect in a catalytic hydrogenation reaction or an electrocatalytic reaction and the like.

The invention discloses a nickel carbide nano material with different morphologies and a preparation method thereof. The preparation method comprises the following steps: respectively preparing a sodium sulfate solution and a triethanolamine solution, mixing the two solutions, and then adding a potassium tetracyanonickelate solution, an ammonia water solution and absolute ethyl alcohol; sealing the mixed solution in a hydrothermal reaction kettle, and carrying out solvothermal reaction; centrifugally separating and washing the reaction product, and staying overnight under a vacuum condition to obtain a dark green precursor; and roasting the dark green precursor to obtain the nickel carbide nano material. The method is simple to operate and low in cost, and the product is high in purity, good in crystal form, controllable and good in reproducibility. The prepared nickel carbide nano-material with different morphologies is of three structures: irregular nano-sheets, spherical nano-particles and regular quadrangles, and the specific surface area of the material is effectively increased through the regular and ordered nickel carbide nano-materials, so that the active sites of the material are increased, and the performance of the material is improved.