134 results about "Molybdenum diselenide" patented technology

The invention proposes a method for growing a substrate-modified large-size monolayer molybdenum disulfide film through chemical vapor deposition. Ammonium sulfide serves as a substrate surface modifying agent; a nucleation rate is controlled through such methods as control of a concentration of the modifying agent, a dipping time and a cleaning method; and a film thickness is controlled through such methods as control of a growing temperature, a growing time and an air flow of the chemical vapor deposition. The method can efficiently grow the large-size monolayer molybdenum disulfide film under the condition of a relatively lower growing temperature on the basis of traditional growth chemical vapor deposition equipment. The method for growing large-size monolayer molybdenum disulfide, provided by the invention, is suitable for the growth of large-size monolayer tungsten disulfide, molybdenum diselenide, tungsten diselenide and the like similar to two-dimensional semiconductor materials in structure.

The invention relates to a molybdenum diselenide/carbon black composite hydrogen evolution electro-catalysis material and a preparation method thereof and belongs to the field of electro-catalysis hydrogen evolution. According to the preparation method, a carbon black oxide with low oxidation degree is obtained by an improved Hummer method; a sodium molybdate crystal and Se powder are used as a molybdenum source and a selenium source; hydrazine hydrate is used as an Se powder dispersion solvent and a reducing agent; DMF is used as a solvent; the molybdenum diselenide/carbon black composite hydrogen evolution electro-catalysis material can be prepared by one-step solvent thermal reaction at 200 DEG C. The preparation method of the carbon black oxide with low oxidation degree is simple in process and high in yield; the molybdenum diselenide/carbon black composite hydrogen evolution electro-catalysis material can be prepared by a simple and mild one-step solvothermal method; the molybdenum diselenide/carbon black composite hydrogen evolution electro-catalysis material is low in cost and high in repeatability; the large-scale synthesis is liable to implement; when the molybdenum diselenide/carbon black composite hydrogen evolution electro-catalysis material is applied to electro-catalysis hydrogen evolution reaction, the molybdenum diselenide/carbon black composite hydrogen evolution electro-catalysis material shows excellent electro-catalytic property.

The present invention provides a preparation method of a molybdenum diselenide/cobalt diselenide nanocomposite, and belongs to the technical field of preparation of inorganic nanocomposites. The preparation method comprises the following steps: adding 0.002-0.05 mol/L of molybdate, 0.01-0.1 mol/L of cobalt salt and 0.02-0.5 mol/Lof molybdenum diselenide into deionized water to obtain mixed liquid at first; adding a complexing agent into the mixed liquid, and stirring to obtain emulsion, wherein the volume ratio of the complexing agent and the deionized water is 0.5-2; transferring the emulsion to an autoclave, reacting for 6-24 hours at the temperature of160-240 DEG C, after cooling down the reacted solution, centrifuging, washing and drying to obtain solid powder; and annealing the solid powder for 1-4 hours at the temperature of 400-600 DEG C. The method provided by the present invention has the advantages that raw materials and technological equipment are simple, production cost is low, and the molybdenum diselenide/cobalt diselenide nanocomposite is easy to produce in large scale; and the obtained composite is composed of a micro-tube which is obtained by nanosheets in a self-assembling manner, so that electrocatalytic activity is good.

The invention provides a preparation method of a molybdenum diselenide nanosheet ball-graphene composite material and relates to a preparation method of molybdenum diselenide nanosheet ball-graphene composite material supercapacitor electrode material. The problem that molybdenum diselenide as the supercapacitor electrode material is poor in electrical conductivity. The preparation method comprises the following steps: firstly, preparing graphene oxide, then, mixing the graphene oxide with sodium molybdate, hydrazine hydrate and selenium powder to prepare a mixed solution, and transferring themixed solution into a reaction kettle; a supercapacitor electrode material with high specific surface area and high performance is obtained through a one-step hydrothermal method. The method in the invention has the advantages of being simple in process, high-efficiency, low in cost and the like.

The invention discloses a molybdenum diselenide/ferroferric oxide magnetic nano composite material, and a preparation method and application thereof. The composite material comprises 10-40 wt% of Fe3O4 and the balance of MoSe2. The preparation method comprises the following steps: by using a molybdenum source, a selenium source and a reducer as raw materials, carrying out solvothermal reaction at 120-260 DEG C, and keeping the temperature for 12-48 hours to obtain the matrix MoSe2 nanoflowers; and dispersing the MoSe2 nanoflowers into a sodium acetate solution, and reacting with a soluble iron salt at 130-260 DEG C for 8-24 hours to obtain the reaction product which is uniform nanoparticles. The composite material has high yield, and has wide application prospects in the fields of catalysis, adsorption, lithium batteries, supercapacitors, lubrication and abrasion, and the like.

The invention relates to a carbon fiber-molybdenum selenide nanosheet core-shell composite structure and preparation method thereof, and belongs to the technical field of material preparation. A core of the composite structure is carbon fibers, and a shell of the composite structure is array-shaped molybdenum selenide nanosheets. The method comprises the steps that in a vacuum tube furnace, selenium powder is directly evaporated through a thermal evaporation technology, under the action of carrier gas, pre-oxidized polyacrylonitrile fiber soaked with MoO3 suspension is fumigated at high temperature, the condition that the carbon fibers and the molybdenum selenide nanosheets are synthesized simultaneously is achieved, and the arbon fiber-molybdenum selenide nanosheet core-shell composite structure can be obtained through high-yield preparation. Products prepared through the method is high in yield, density and purity, controllable in morphology and free of after-treatment; the method has the advantages of being simple in equipment and technology, strict and controllable in synthetic growth condition, high in product yield, low in cost, clean and environmentally friendly in production process and the like. The obtained material is an excellent visible light catalyst, an electro-catalyst, a sodium-ion/lithium-ion anode material and a light-emitting transistor material.

The invention relates to an antifriction coating of a pot bearing in a bridge construction and a method. The dry film thickness of the antifriction coating is 50-250 mu m, the flashing point of the coating is 110 DEG C, and the specific gravity is 1200 +/- 60 g/L; and the antifriction coating comprises components in percentage by weight as follows: 1-6% of molybdenum disulfide, 10-16% of graphite, 1-4% of graphite fluoride, 2-9% of tungsten disulfide, 0-3% of molybdenum diselenide, 1-3% of nano-diamond, 1-15% of silicon nitride, 2-10% of aluminum oxide, 0-3% of silicon dioxide, 0-2% of antimonous oxide, 3-15% of silicon carbide, 0-1.5% of a carbon nano tube, 10-16% of polyurethane resin, 12-30% of epoxy resin, 6-10% of acrylic resin and 0-6% of a powder surface treating agent. According to the antifriction coating and the method, the process is simple, the cost is lower, performance indexes are all superior to those of a conventional modified polyfluortetraethylene plate and an ultra-high molecular weight polyethylene plate, and the pot bearing coated with the coating has high self-lubricating performance and high wear-resisting performance.

The invention relates to an automatic-door threaded rod of a railway vehicle and an anti-friction coating thereof as well as a spraying method of the anti-friction coating. The dry film thickness of the anti-friction coating is 15-25 micrometers, the flashing point of the coating is 110 DEG C, and the specific gravity of the coating is 1200+/-60g/L; and the coating comprises the following components in percentage by weight: 1-6% of molybdenum disulfide, 10-28% of graphite, 1-3% of graphite fluoride, 2-8% of tungsten disulfide, 0-3% of molybdenum diselenide, 1-3% of nanometer diamond, 1-5% of silicon nitride, 2-8% of aluminium oxide, 0-3% of silica, 0-2% of antimony trioxide, 3-15% of silicon carbide, 0-1.5% of carbon nanotube, 10-16% of polyester resin, 15-30% of epoxy resin, 6-20% of acrylic resin and 0-8% of powder surface treating agent. The automatic-door threaded rod of the railway vehicle, which adopts the anti-friction coating, has good self-lubrication and abrasion performance; the production process is simple; and the production cost is low.

The invention discloses a preparation method of a two-dimensional molybdenum selenide function material electrolysis water hydrogen production catalyst, belonging to the technical field of preparation methods of electro-catalysis materials. The preparation method comprises the followings steps: (1) preparing monodisperse silicon dioxide solid spheres with the diameters of 430 nanometers; (2) regularly assembling and arraying the prepared silicon dioxide solid spheres on an interface of air and water, dropwise adding monodisperse silicon dioxide sphere water-ethanol suspension liquid onto a glass sheet suspended on the surface of deionized water so as to gradually and regularly array the monodisperse silicon dioxide spheres on the water surface along the edge of the glass sheet to form a single-layer array, finally truncating a silicon dioxide sphere ordered structure by virtue of silicon dioxide/silicon substrate, and repeatedly carrying out the operations; (3) growing a molybdenum diselenide/silicon dioxide shell-core composite material ordered structure array by virtue of a chemical vapor deposition technique; and (4) removing an internal silicon dioxide template so as to obtain a molybdenum selenide function material grading type hollow sphere ordered structure array.

The invention belongs to the fields in development, design and application of photocatalytic materials, and discloses a flower-shaped molybdenum diselenide/carbon nano tube composite material as wellas a synthetic method and application thereof. In the flower-shaped molybdenum diselenide/carbon nano tube composite material, the mass ratio of flower-shaped molybdenum diselenide to carbon nano tubes is 1:(0.025-1), and the carbon nano tubes are evenly adhered on the flower-shaped molybdenum diselenide. The preparation method comprises the following steps: adding carbon-containing nano tubes into a molybdenum diselenide solution to be synthesized for a hydrothermal reaction at 180-240 DEG C; and then performing centrifugal cleaning, and drying at a vacuum environment to obtain the flower-shaped molybdenum diselenide/carbon nano tube composite material. The method provided by invention is simple and good in repeatability, and has good application prospects.

The invention relates to an antifriction coating layer of a screw compressor, and in particular relates to a screw with a composite molybdenum disulfide antifriction coating layer for a dry type screw compressor. The thickness of a dry film of the antifriction coating layer is 30-50 microns; and the antifriction coating consists of 10-16% of polyester resin, 12-30% of epoxy resin, 6-10% of acrylic resin, 1-6% of molybdenum disulfide, 10-16% of graphite, 1-4% of graphite fluoride, 2-9% of tungsten disulfide, 0-3% of molybdenum diselenide, 1-3% of nano diamond, 1-15% of silicon nitride, 2-10% of aluminium oxide, 0-3% of silicon dioxide, 0-2% of antimony trioxide, 3-15% of silicon carbide and 0-1.5% of carbon nano tube based on the total weight. The antifriction coating layer provided by the invention has good wear resistance and corrosion resistance; and the screw with a composite molybdenum disulfide antifriction layer provided by the invention can guarantee the operation stability of the screw compressor in a dry state, improves the air quality of the compressor, and meets the harsh requirements on the air quality of compressor in the food production, the packaging industry, the pharmacy, the bioengineering, the electroplating industry, the automobile spraying industry and the textile industry.

The invention relates to a preparation method of an asymmetric supercapacitor based on molybdenum diselenide/charcoal, and relates to a preparation method of an asymmetric supercapacitor. The invention solves the problems of high preparation cost and low specific capacitance of the existing carbon material. The preparation method comprises the steps of first, removing lignin; second, preparing molybdenum diselenide powder; third, preparing wood chips loaded with molybdenum diselenide; fourth, preparing a molybdenum diselenide/charcoal composite material; fifth, preparing charcoal; sixth, preparing a manganese dioxide/charcoal composite material; and seventh, preparing an asymmetric supercapacitor. The scheme of the invention is applied to the preparation of the asymmetric supercapacitor based on molybdenum diselenide/charcoal.

The invention provides a preparation method of a flaky molybdenum selenide/carbon fiber sheet composite material. The preparation method of the flaky molybdenum selenide/carbon fiber sheet composite material comprises the steps that selenium powder is dissolved into hydrazine hydrate, and then, a solution A is formed through ultrasonic treatment; sodium molybdate is dissolved into deionized water,and then acetic acid is added to obtain a solution B; anodic oxidation pretreatment is carried out on hydrophilic type carbon cloth, and then washing and drying are carried out to obtain the hydrophilic type carbon cloth after treatment; and the solution A and the solution B are mixed to form a solution C, the hydrophilic type carbon cloth after the treatment is placed in the solution C, ultrasonic treatment is carried out, then, hydrothermal reaction is carried out, and finally burning is carried out under an inert atmosphere. The molybdenum selenide and the hydrophilic type carbon cloth arerecombined, a synergistic effect is used, a stable composite structure is established through carbon fiber sheet formworks, agglomeration of the molybdenum selenide and the hydrophilic type carbon cloth is restrained, the diffusion rate of sodion is improved, more carrier transport channels are provided, the structural stability and the high electrical conductivity of a whole electrode during charging and discharging are maintained, the electrode reaction dynamics process is accelerated, and thus the structural stability and electrical conductivity of cathode materials are improved.

The invention discloses a method for preparing a steel structure aqueous corrosion-resistant fireproof coating material and relates to a coating preparation method. The method comprises the followingsteps: establishing a melamine and phytic acid flame-retardant layer from molybdenum diselenide (MoSe2) nanosheets by using a layer-by-layer self-assembling method (LBL), and filling an aqueous epoxyresin with the functionalized molybdenum diselenide nanosheets, so as to obtain a steel structure aqueous corrosion-resistant fireproof coating. By adopting the method, the P-N system flame-retardantlayer is prepared, so that the flame retardancy of the aqueous epoxy resin can be improved; the phytic acid in the nano packing has great chelation potential energy, so that the coating can be connected in a relatively intense mode through the phytic acid, and the corrosion resistance and the durability of the coating can be improved; the problem that a nano particle is liable to aggregate becauseof the high surface energy can be also solved.

The invention belongs to the field of battery materials, and particularly discloses a polymer@two-dimensional material modified layered double hydroxide composite diaphragm material which comprises apolymer material and an active material compounded in the polymer film material, wherein the active material is the two-dimensional material modified layered double hydroxides and comprises layered double hydroxides and a two-dimensional material growing on the surfaces of the layered double hydroxides in situ; the two-dimensional material is at least one of molybdenum diselenide, tungsten diselenide, molybdenum disulfide and tungsten disulfide. The invention also provides preparation of the diaphragm and application of the diaphragm in a lithium-sulfur battery. The material is advantaged in that the brand-new material provided by the invention can effectively solve the boundary effect of a two-dimensional material, can open more active sites, avoids agglomeration, and can unexpectedly improve the performance of the battery diaphragm by adding the brand-new material into the battery diaphragm, for example, the sulfur loading capacity and the catalytic degradability to polysulfide compounds are improved, and the performance of the battery is improved.

The invention discloses a preparation method of a cerium vanadate modified molybdenum diselenide composite photocatalyst, and applications of the cerium vanadate modified molybdenum diselenide composite photocatalyst in the field of environmental pollutant treatment, and belongs to the field of material preparation and photocatalysis research. The cerium vanadate modified molybdenum diselenide composite photocatalyst possesses three dimensional morphology characteristics, and is prepared via combination of molybdenum diselenide sheets of a two dimensional structure with cerium vanadate nanoparticles. In the preparation process, simple hydrothermal method is adopted to realize synthesis of the cerium vanadate modified molybdenum diselenide composite photocatalyst. Under the effect of ceriumvanadate, the cerium vanadate modified molybdenum diselenide composite photocatalyst possesses excellent photocatalytic performance, and applications of molybdenum diselenide catalyst are promoted.

The invention relates to an amphiphilic modified nano lamellar molybdenum-selenide-based auxiliary agent used for a carbon fiber sizing agent. The amphiphilic modified nano lamellar molybdenum-selenide-based auxiliary agent comprises a polyacrylamide-polystyrene block copolymer modified amphiphilic modified nano lamellar molybdenum selenide dispersion solution, a dispersant, silicone oil and high-grade fatty acid. The auxiliary agent comprises the following components based on 100 parts: 2-32 parts of the molybdenum selenide dispersion solution, 1-5 parts of the dispersant, 60-90 parts of the silicone oil and 1-3 parts of high-grade fatty acid. The molybdenum selenide dispersion solution is formed by adding acrylamide, styrene and ammonium persulfate into an upper-layer water solution containing isopropyl alcohol and molybdenum selenide by reacting, wherein the size of molybdenum selenide is smaller than 200 microns. The method has a simple and reliable process and the prepared auxiliary agent can be used for the fiber sizing agent with the special purpose; and the auxiliary agent has very good protection effect in a preparation process of carbon fibers, glass fibers and the like; and meanwhile, mechanical properties of a composite material can be improved.

The invention relate to a molybdenum diselenide@ nitrogen-doped carbon dodecahedronal nuclear-body sodium ion battery negative electrode material, a preparation method thereof and a sodium ion battery, and belongs to the technical field of a new energy material. The molybdenum diselenide@ nitrogen-doped carbon dodecahedronal nuclear-body sodium ion battery negative electrode material comprises a core and a shell, wherein the shell is coated on a surface of the core, the core is a nitrogen-doped carbon dodecahedronal nuclear body, and the shell is a molybdenum diselenide nanosheet. The molybdenum diselenide@ nitrogen-doped carbon dodecahedronal nuclear-body sodium ion battery negative electrode material has a unique core-shell structure, the nitrogen-doped carbon dodecahedronal nuclear bodyis used for providing an enough space for sodium ion storage and electron transmission, so that the advantages of relatively high reversible capacity, high stability, long cycle lifetime and the like, and the molybdenum diselenide@ nitrogen-doped carbon dodecahedronal nuclear-body sodium ion battery negative electrode material is a favorable sodium ion battery negative electrode material and haslong-term development prospect. The molybdenum diselenide@ nitrogen-doped carbon dodecahedronal nuclear-body sodium ion battery negative electrode material has the advantages of low cost, no toxicity,no pollution and the like.

The invention discloses a method for synthesizing a molybdenum selenide/nitrogen doped carbon rod via solid-phase co-heating. The composite material consists of molybdenum selenide and a nitrogen doped carbon rod; the molybdenum selenide and the nitrogen doped carbon rod are compound through a covalent bond effect; a two-dimensional nano tablet layer of the molybdenum selenide grows along the surface of the one-dimensional carbon rod so as to form a graded tablet rod-shaped structure. The molybdenum selenide/nitrogen doped carbon rod is used as a lithium ion battery cathode material; when thecurrent density is 100 mAg-1, the first charging/discharging reversible capacity of the composite material is 928 mAhg-1; and after carrying out cycle for 100 times, the capacity can be maintained at906 mAhg-1, and the capacity retention rate is as high as 97.6%. The material has favorable rate capability; when the current density is 1000 mAg-1, the reversible capacity can be up to 560 mAhg-1. When the current density is restored from 1000 mAg-1 to 100 mAg-1, the reversible capacity can be restored to 920 mAhg-1 while excellent cycling stability is kept.

The invention discloses an iron-doped molybdenum diselenide nano material with a hollow structure as well as a preparation method and electrocatalytic nitrogen reduction application thereof. The method comprises the following steps: dissolving selenium powder in hydrazine hydrate; dissolving molybdenum salt and iron salt in DMF to obtain a metal salt solution; and adding the hydrated selenium precursor solution into the metal salt solution, heating to carry out a solvothermal reaction, washing and drying to obtain the material. The iron-doped molybdenum diselenide material is a hollow material with a porous structure. Iron-doped molybdenum diselenide is dispersed in ethanol and then is dispensed on carbon cloth to prepare an electrode.The iron-doped molybdenum diselenide material provided by the invention can be applied to an electro-catalytic nitrogen reduction reaction at normal temperature and normal pressure. The catalyst has the advantages of simple preparation method, large specific surface area, high catalytic activity, excellent stability and the like.

The invention discloses an MSe2 thin film material, a preparation method and application thereof, and belongs to the technical field of thin film material preparation. The MSe2 thin film material comprises a base, and an MSe2 thin film loaded on the base, wherein the MSe2 thin film comprises at least one of a tungsten diselenide thin film and a molybdenum diselenide thin film. According to the MSe2 thin film material provided by the invention, the tungsten diselenide thin film and/or the molybdenum diselenide thin film horizontally grows on the surface of stainless steel in a layered structure, and each layer of thin films are closely packed in a close-packed hexagonal structure to form a monomolecular layer with good stability; each layer of single molecules are combined mutually into a layered semiconductor material by depending on van der waals force; the sliding between the layered semiconductor materials is easy; and the MSe2 thin film material has relatively low friction coefficient in the friction material application.

The invention discloses a method for synthesizing a single-layer transition metal chalcogenides, and belongs to the technical field of preparation of nano materials. The method comprises the followingsteps that molybdenum diselenide powder and tungsten diselenide powder are taken as raw materials and a gas mixture of inert gases Ar (95%) and H2 (5%) is taken as carrier gas; a PVD method is adopted to take an sole temperature region of a high-temperature tubular vacuum oven as both a powder melting and evaporating region and a region for a substrate to bear sample deposition; and a single-layer MoSe2 sample and a single-layer WSe2 sample are synthesized on a Si/SiO2 substrate and a sapphire substrate. The sample prepared by the invention is great in area, is relatively uniform, is good inquality and is high in repetitive rate. The preparation method has the advantages of simple operation, short reaction time,low cost, and no pollution on environment.

A preparation method of a molybdenum diselenide/carbon fiber cloth composite comprises the following steps: dissolving selenium powder in hydrazine hydrate, and performing ultrasonic processing to form a solution A; dissolving sodium molybdate in deionized water, and adding chitosan to obtain a solution B; performing anodizing pretreatment on hydrophilic carbon cloth to obtain treated hydrophiliccarbon cloth; mixing the solution A and the solution B to form a solution C, placing the treated hydrophilic carbon cloth in the solution C for ultrasonic processing, performing hydrothermal reactionto obtain carbon fiber cloth with molybdenum diselenide growing, and calcining the carbon fiber cloth in an inert atmosphere finally. The hydrophilic carbon cloth is composited with molybdenum diselenide, a stable composite structure is constructed by a carbon fiber cloth skeleton on the basis of a synergistic effect, agglomeration of the carbon fiber cloth is inhibited, sodium ion diffusion rateis increased, more carrier transport channels are provided, structural stability during charge-discharge and high conductivity of the whole electrode are kept, a reaction kinetic process of the electrode is promoted, and accordingly, electrochemical performance of an anode material is improved.

The invention discloses a preparing method of a silver carbonate modified molybdenum selenide composite photocatalyst and an application in treating environment pollutants and belongs to the researchfield of material preparation and photocatalysis. The photocatalyst has characteristics of two dimension feature and is synthesized by the combination of the molybdenum selenide with the two dimensionstructure and silver carbonate nano particles. During the process of preparing the photocatalyst, the silver carbonate modified molybdenum selenide composite photocatalyst is synthesized by adoptingthe hydrothermal method and precipitation method with simple technology. Under the effect of the silver carbonate, the high photocatalysis property is appeared by the silver carbonate modified molybdenum selenide composite photocatalyst, and the application of the molybdenum selenide photocatalyst is promoted.