527results about "Binary selenium/tellurium compounds" patented technology

The invention relates to the technical field of energy storage nano materials, and provides a ZIF-67-derived CoSe2-atNC hollow nano cubic box material and a preparation method thereof.The preparation method comprises the steps that a solution A is prepared from cobalt nitrate hexahydrate, cetyltrimethylammonium bromide and deionized water, a solution B is prepared from 2-methylimidazole and deionized water, and the ZIF-67-derived CoSe2-atNC hollow nano cubic box material is obtained; adding the solution A into the solution B, stirring to prepare a ZIF-67 precursor solution, and carrying out aging reaction to prepare a ZIF-67 nanocube material; preparing a solution C by adopting a ZIF-67 nanocube material and absolute ethyl alcohol, preparing a solution D by adopting tannic acid, deionized water and absolute ethyl alcohol, and adding the solution C into the solution D for etching reaction to prepare a TA-Co hollow nano cubic box material; carrying out first heat treatment on the TA-Co hollow nano cubic box material, mixing and grinding a product of the first heat treatment and selenium powder, and then carrying out second heat treatment to prepare the ZIF-67 derived CoSe2 (at) NC hollow nano cubic box material. The preparation method can be used for preparing the sodium battery negative electrode material with high specific capacity and high cycling stability.

The invention belongs to the field of resource regeneration, and particularly relates to a method for separating and recycling copper, indium, gallium and selenium from a waste solar thin film battery. According to the method, the waste solar thin film cells are subjected to oxidizing roasting, deep eutectic leaching and extraction and reverse extraction, and high-quality conversion and purification of all valuable elements in the waste solar thin film cells to oxides of the valuable elements are achieved. According to the method, the process route is simple, high-selectivity extraction of indium is achieved through the synergistic effect of the deep eutectic solvent and P204, and meanwhile effective recovery of valuable elements such as copper and selenium is achieved. The recovered and prepared oxide can be widely applied to strategic emerging industries such as semiconductors, photovoltaics, aerospace, military and the like.

A method for preparing a ZnSe quantum dot, a ZnSe quantum dot, a ZnSe structure and a display device are provided. The method includes preparing a first zinc precursor solution, a second zinc precursor solution, a first selenium precursor solution, and a second selenium precursor solution with a lower reaction activity than the first selenium precursor solution, adding the first selenium precursor solution to the second zinc precursor solution to form an intermediate of the ZnSe quantum dot, performing the following operation at least once to form the ZnSe quantum dot: sequentially adding the first zinc precursor solution and the second selenium precursor solution to the intermediate of the ZnSe quantum dot and making the first zinc precursor solution, the second selenium precursor solution, and the intermediate of the ZnSe quantum dot react.

The invention discloses an Ag2Se-based thermoelectric material and a preparation method thereof, and belongs to the technical field of thermoelectric materials. The preparation method comprises the steps that Ag powder and Se powder are mixed and ground according to the molar ratio of (1.9-2.1): 1, and mixed powder is obtained; the mixed powder is subjected to cold pressing to form blocks, and prefabricated blocks are obtained; the prefabricated block is subjected to heat preservation for 20-120 minutes under the conditions that the pressure is 1-5 GPa and the temperature is 400-1000 DEG C, and an Ag2Se initial product is generated through reaction; crushing the primary product, and grinding into fine powder; and sintering the fine powder for 5-30 minutes under the conditions that the pressure is 1-5 GPa and the temperature is 300-900 DEG C, so as to obtain the composite material. The sample is prepared through high temperature and high pressure for the first time, the method is simple, operation is easy to control, the preparation period can be greatly shortened, and the energy utilization rate is increased; the electroacoustic transport performance of Ag2Se is effectively regulated and controlled by changing the pressure and the temperature, and finally the thermoelectric performance is effectively improved.

The invention relates to a defect-rich cobalt-doped MoS2 / NiSe2 heterojunction nano array electrode as well as a preparation method and application thereof, and belongs to the field of electro-catalysis and new energy materials. The electrode is composed of a self-supporting MoS2 / NiSe2 heterojunction nano array, cobalt atom doping and abundant structure defects are introduced at the same time, and the hydrogen evolution reaction (HER), oxygen evolution reaction (OER) or urea oxidation reaction (UOR) activity of an electrode material in alkaline electrolyte is remarkably improved. The prepared electrode material has the advantages of low cost, high activity, good stability and the like, and has wide application prospects in the fields of water electrolysis, metal-air batteries, domestic sewage treatment and the like.

The utility model relates to the technical field of selenium dioxide production, in particular to a selenium dioxide production device which comprises a reaction furnace, a feeding mechanism, a mounting shaft, a raking rod, a blanking net, a driving mechanism, an oxygen supply mechanism and an air outlet pipe, the feeding mechanism is arranged above the reaction furnace, and the discharging end of the feeding mechanism is communicated with the reaction furnace; the mounting shaft is arranged in the reaction furnace, and one end of the mounting shaft is rotationally connected with the inner wall of the reaction furnace; the multiple material raking rods are arranged, and each material raking rod is connected with the mounting shaft through two connecting rods. The driving mechanism works to drive the raking rod and the blanking net to rotate together, selenium powder accumulated at the bottom of the reaction furnace is raked, the raked selenium powder sequentially falls into the bottom of the reaction furnace through blocking and buffering of the blanking net, the selenium powder makes contact with oxygen in the falling process, the contact area between the selenium powder and the oxygen is greatly increased, and the contact time between the selenium powder and the oxygen is greatly prolonged. The reaction progress is accelerated and the production efficiency is improved.

Provided is a semiconductor nanoparticle complex composition and the like in which a semiconductor nanoparticle complex is dispersed at a high concentration and which has high fluorescence quantum yield. A semiconductor nanoparticle complex composition in which a semiconductor nanoparticle complex is dispersed in a dispersion medium, wherein: the semiconductor nanoparticle complex has a semiconductor nanoparticle and a ligand coordinated to the surface of the semiconductor nanoparticle; the ligand includes an organic group; the dispersion medium is a monomer or a prepolymer; the semiconductor nanoparticle complex composition further includes a crosslinking agent; and a mass fraction of the semiconductor nanoparticle in the semiconductor nanoparticle complex composition is 30% by mass or more.

The invention discloses a bismuth telluride nanopore maskless direct writing preparation method based on electron beam irradiation, and belongs to the technical field of nanometer manufacturing. The method comprises the following steps: firstly, constructing an initial nanopore in a two-dimensional bismuth telluride material by utilizing a converged electron beam; and then the aperture size of the nanopore is accurately regulated and controlled by adjusting the beam density of the electron beam. The method effectively solves the key technical bottlenecks of interface chemical residue pollution caused by a traditional photoresist mask process, intrinsic defect formation caused by high-energy particle bombardment and the like, and breaks through the limitation of an existing etching technology in the aspect of sub-nanoscale structure precision control; precise control of the aperture of the nanopore can be achieved by adjusting the irradiation intensity of the electron beam, and the method has the advantages of being easy and convenient to operate, low in cost, environmentally friendly and the like and can be widely applied to the fields of nanometer electronic devices, sensors and the like.

The invention relates to the technical field of new energy materials, in particular to a thermoelectric composite material and a preparation method and application thereof.The thermoelectric composite material comprises 2D TMDs, a P-type semiconductor polymer and a conductive polymer, the P-type semiconductor polymer and the conductive polymer are cross-linked to form a composite conductive polymer, and the 2D TMDs are dispersed in the composite conductive polymer. The composite conductive polymer has the effects of forming a thermoelectric loop, regulating and modifying the interface of the 2D TMDs and protecting the 2D TMDs dispersed in the composite conductive polymer, and the 2D TMDs and the P-type semiconductor polymer convert heat energy into electric energy under the Seebeck effect. The thermoelectric building material additive comprises a thermoelectric composite material combined on an inorganic silica gel carrier. The thermoelectric cement-based material comprises cement and a thermoelectric building material additive. The thermoelectric cement-based material has good thermoelectric performance, stability and durability, and is suitable for scenes with obvious temperature difference or urgent energy recovery requirements.

The invention discloses a sodium-based high-entropy sulfide solid electrolyte as well as a preparation method and application thereof, and belongs to the technical field of solid electrolyte materials. Through high-entropy design and in combination with process innovation: microwave rapid sintering and interface / coating collaborative process optimization, high ionic conductivity (gt; 8 * 10 <-3 > S / cm), and long cycle stability (gt; and the grain boundary impedance is reduced by 72%. In the preparation method of the sodium-based high-entropy sulfide solid electrolyte, volatilization of sulfur is avoided through high-energy ball milling and microwave rapid sintering; a 5T superconducting magnetic field is used for inducing oriented growth; crystal grains are preferentially arranged along a crystal face, so that the ion transmission anisotropy is improved; interface engineering processing is carried out, and interface impedance is reduced; and the interface wettability and the mechanical strength are improved by adopting dynamic coating.

The invention provides a method for recycling valuable metal from germanium-antimony-tellurium alloy waste. The method comprises the three steps of surface treatment, chlorine reaction and compartment condensation and discharging. Oxidation films on the surfaces of the waste materials are removed through surface treatment, and the subsequent chlorine reaction efficiency is improved; then a self-made chlorination-step condensation integrated device is utilized, germanium, antimony and tellurium react with chlorine at the high temperature to generate gaseous chloride, step-by-step condensation separation is achieved through partition temperature control based on the boiling point difference of tellurium tetrachloride, antimony pentachloride and germanium tetrachloride, and target products are collected respectively; and finally, introducing inert gas to purge residual chlorine, and discharging safely. The method has the advantages of short process flow, no need of complex wet process steps and low equipment investment; metal chlorides are efficiently separated through the integrated device, and recovery is thorough; and the pyrogenic process is mainly adopted, no wastewater is generated, only tail gas is treated in a compliance manner, and the method is environment-friendly. Compared with a traditional wet process, the method has the remarkable advantages of high efficiency, low cost, environment friendliness and the like.

The invention discloses a heterostructure sodium ion battery negative electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion batteries. The method comprises the following steps: (1) dissolving a carbon source, tin salt and antimony salt in a solvent to obtain a precursor solution; the carbon source is a nitrogen-containing organic compound; (2) removing a solvent in the precursor solution to obtain precursor powder; and (3) in a reducing atmosphere, carrying out gas-phase selenylation treatment by using selenium powder to obtain the sodium-ion battery negative electrode material with the heterostructure SnSe-Sb2Se3, namely the sodium-ion battery negative electrode material with the heterostructure. The method is simple and easy in process, good in repeatability and easy to adjust and realize industrial production, and the prepared heterostructure sodium ion battery negative electrode material relieves material volume expansion, has excellent sodium storage performance, brings excellent long cycle performance and rate capability, and has wide popularization and application prospects in the fields of electronic equipment, large-scale energy storage and the like.

The invention belongs to the technical field of nano composite materials, and relates to a preparation method of an iron diselenide / nitrogen-sulfur co-doped carbon nanosheet composite material, which comprises the following steps: putting cellulose, sodium bicarbonate and thiourea into a mortar, uniformly grinding, putting into a tubular furnace, calcining at high temperature under the protection of inert gas, naturally cooling, centrifugally separating and collecting the calcined powder, thereby obtaining the iron diselenide / nitrogen-sulfur co-doped carbon nanosheet composite material. The nitrogen and sulfur co-doped carbon nanosheets are obtained; ultrasonically dispersing iron nitrate nonahydrate in ethanol, heating in an oil bath until the ethanol is evaporated to dryness, and carrying out heat treatment to obtain an iron-based precursor; the obtained iron-based precursor, selenium dioxide and nitrogen and sulfur co-doped carbon nanosheets are ultrasonically dispersed in benzyl alcohol, the mixture is transferred into a reaction kettle with a polytetrafluoroethylene lining, the composite material is obtained after solvothermal reaction, and the morphology of the composite material is that iron diselenide nanoparticles are evenly and densely attached to the surfaces of the nitrogen and sulfur co-doped carbon nanosheets. The method is simple and easy to implement, suitable for large-scale production, easy to implement industrially and expected to be applied to the negative electrode of the hybrid supercapacitor.

The present invention belongs to the technical field of electrochemical sensors, and in particular to a Ti 3 C 2 Tx / Bi 2 Se 3 Composite material and preparation method thereof and application thereof in screen-printed electrochemical sensor. The composite material is composed of Bi 2 Se 3 and Ti 3 C 2 Tx is compounded; Bi 2 Se 3 and Ti 3 C 2 T x The mass ratio of Ti is 1-5:1. The present invention uses a simple self-assembly method to 3 C 2 T x with Bi 2 Se 3 The flower-like structures are stably combined together, the method is simple, and the film-forming area is controllable. The present invention realizes a sweat Pb and Cd ion sensor with low detection limit and high sensitivity, the sensor manufacturing method is simple, the variables are easy to control, no complex instruments are required, the cost is low, and the Pb and Cd ion detection can be performed well and timely.

The invention relates to a vacancy-assisted tin heterovalent doped bismuth selenide material as well as a preparation method and application thereof, Se vacancy defects existing in VSe-Bi2Se3 are utilized to assist in stable doping of Sn < 4 + > into Bi sites, so that the Sn-VSe-Bi2Se3 material is obtained. As the positive electrode material of the zinc ion battery, the Sn-VSe-Bi2Se3 shows high specific capacity, excellent rate capability and long-acting stable cycle performance, and has the advantages of simple and convenient process, mild conditions and suitability for large-scale production.

The invention relates to the field of inorganic chemical industry production, and discloses a high-purity selenium dioxide continuous production process and equipment, the equipment comprises a cooling crystallization barrel, one side of the cooling crystallization barrel is provided with a selenium dioxide production mechanism, the selenium dioxide production mechanism is used for selenium dioxide production, and the cooling crystallization barrel is provided with a cooling crystallization barrel. An air pressure generation mechanism is arranged outside the cooling crystallization barrel, a gas on-off mechanism is arranged at the top of the air pressure generation mechanism, an air exhaust filtering mechanism is arranged at the top of the cooling crystallization barrel, and a tail barrel is arranged on the side, away from the selenium dioxide production mechanism, of the cooling crystallization barrel; the air pressure generating mechanism is used for keeping the negative pressure state in the cooling crystallization barrel and the tail barrel. According to the selenium dioxide production device, the inside of the feeding pipeline is filled with the materials, so that the materials can be supplemented in time after the materials are consumed, and selenium dioxide can be continuously and efficiently produced, so that the yield and the purity are improved, economic benefits are directly brought, energy waste is avoided, and economic loss is avoided.

The invention relates to the technical field of lithium ion batteries, and particularly discloses an antimony chalcogenide coated lithium cobalt oxide positive electrode material and a preparation method and application thereof.The preparation method comprises the steps that lithium cobalt oxide powder is mixed with an antimony-containing compound, a sulfur-containing compound and a selenium-containing compound in deionized water, and a uniformly-dispersed precursor solution is formed; the molar ratio of the lithium cobalt oxide powder to the compound containing antimony, sulfur and selenium is 1: (0.01-1): (0.01-3): (0.001-2); drying the precursor solution to obtain solid powder; and calcining the solid powder at 100-500 DEG C in a protective atmosphere to finally obtain the antimony chalcogenide coated lithium cobalt oxide positive electrode material. According to the preparation method of the antimony chalcogenide-coated lithium cobalt oxide positive electrode material, the prepared antimony chalcogenide-coated lithium cobalt oxide positive electrode material has good structural stability, and when the antimony chalcogenide-coated lithium cobalt oxide positive electrode material is used in a lithium ion battery, the specific capacity of the lithium cobalt oxide battery under high voltage can be remarkably improved, and the cycle life of the lithium cobalt oxide battery under high voltage can be remarkably prolonged.

The present disclosure relates to the field of nanotechnology. The present disclosure provides a method for preparing nanostructures by fluoride passivation. The present disclosure also provides a method for preparing nanostructures by fluoride and amine passivation. The nanostructures have high quantum yields, narrow emission peak widths, tunable emission wavelengths, and colloidal stability. Nanostructures prepared using the method are also provided. Nanostructure films and molded articles including the nanostructures are also provided.

The invention discloses a synthesis method of a lithium ion battery negative electrode material, and particularly relates to a synthesis method of a C (at) MoSe2 / SnSe2 (at) CNT (O) material constructed based on an oxygen-doped carbon nanotube CNT (O). MoSe2 and SnSe2 mutually doped nanosheets are loaded on the surface of the CNT (O), so that the volume expansion of the material can be relieved, more active sites can be provided, and higher capacity and better long cycle stability can be obtained. According to the method, molybdenum pentachloride, dihydroxy butyl tin chloride, Se, CNT (O) and ethylene glycol are used as raw materials, and the C-coated MoSe2 / SnSe2-coated CNT (O) nano composite heterojunction material is synthesized through ultrasonic dispersion and a subsequent calcination method. Compared with similar products, the product obtained by the method has the advantages that the steps are simple, the safety is high, the cost is low, the prepared product nanosheet has obvious morphological characteristics, CNT (O) coated inside provides multiple active sites, the capacity is high, the cycling stability is good, the advantages are obvious under large current (30Ag <-1 > current density, 10000 times of long circulation, and the capacity is kept at 667mA h g <-1 >), and the preparation method is suitable for industrial production. The large-scale production is favorably realized.

The invention discloses a one-dimensional tubular selenide-carbon composite material assembled by hollow particles and a preparation method and application thereof.The preparation method comprises the following steps that ZnCo-ZIF nanotubes and 2, 5-dihydroxyterephthalic acid are mixed, N, N-dimethylformamide is added, a reaction is conducted, after the reaction is completed, a product is subjected to centrifugal separation, and the one-dimensional tubular selenide-carbon composite material assembled by the hollow particles is obtained. And washing and drying to obtain the one-dimensional tubular MOF material assembled by the hollow particles. And annealing the MOF material in an argon atmosphere to obtain the one-dimensional porous carbon nanotube material assembled by the hollow particles. And then uniformly mixing with selenium powder, and annealing under argon protection to obtain the one-dimensional tubular selenide-carbon composite material assembled by hollow particles. The method is simple to operate and controllable in process, and the prepared product is widely applied to the fields of energy storage, catalysis, environmental governance, biomedicine and the like.

The invention discloses a nickel-cobalt-selenium (Co1-xNixSe2) nano material for electrocatalytic oxidation of ethylene glycol as well as a preparation method and application of the nickel-cobalt-selenium (Co1-xNixSe2) nano material. The material is prepared by a hydrothermal method which comprises the following steps: (1) pouring 20mL of deionized water containing 475.9 mg of CoCl2. 6H2O into a 1mol / L NaOH solution containing 0.32 g of selenium powder to prepare a precursor solution; (2) placing in a stainless steel autoclave with a polytetrafluoroethylene lining, carrying out hydrothermal reaction at 180 DEG C for 18 hours, washing with absolute ethyl alcohol and deionized water, and carrying out vacuum drying at 60 DEG C to obtain a CoSe2 material; and (3) the molar feeding ratio of CoCl2. 6H2O to NiCl2. 6H2O is adjusted, so that the nickel / cobalt ratio x is 0.25, 0.50 or 0.75, and materials with different components, namely Co < 0.75 > Ni < 0.25 > Se < 2 >, Co < 0.50 > Ni < 0.50 > Se < 2 > and Co < 0.25 > Ni < 0.75 > Se < 2 >, are prepared. The series of materials are applied to ethylene glycol oxidation under the alkaline condition, the catalytic performance of Co < 0.50 > Ni < 0.50 > Se < 2 > is optimal, the current density reaches 111 mA cm <-2 > under the electric potential of 1.6 V vs.RHE, the total Faraday efficiency reaches up to 91.4%, and the application prospect in the field of PET plastic recovery is wide.

The invention discloses a magnetic infrared radiation heat dissipation material MnSe2, and a preparation method of the magnetic infrared radiation heat dissipation material MnSe2 comprises the following steps: 1) uniformly mixing manganese powder and selenium powder in proportion, and tabletting the obtained mixed powder to obtain a primary block 2) melting and quenching the obtained primary block under a vacuum condition; 3) grinding the quenched casting body, and tabletting to obtain a secondary block body; and 4) carrying out step-by-step melting annealing on the obtained secondary block under a vacuum condition, and then grinding to obtain the magnetic infrared radiation heat dissipation material MnSe2. Manganese powder and selenium powder are used as main raw materials, the melting quenching process and the step-by-step melting annealing process are combined, the infrared emissivity of the obtained MnSe2 material is promoted to be improved, and particularly, the high emissivity can be shown in the middle infrared band and the far infrared band; when the material is applied to preparation of a MnSe2 composite film, a good radiation refrigeration effect can be achieved, and the material has a good application prospect in the fields of thermal management of microelectronic devices and the like.

The present invention belongs to the field of functional materials. Provided is a method for preparing a zinc-doped cobalt selenide catalyst. The method for preparing a zinc-doped cobalt selenide catalyst comprises: adding a selenium powder to a potassium hydroxide solution, stirring same until the selenium powder is dissolved, then adding deionized water, cobalt nitrate, zinc nitrate and ethylenediaminetetraacetic acid disodium salt to the resulting solution, continuing stirring, putting the finally obtained solution into a polytetrafluoroethylene reaction kettle for a hydrothermal reaction, and after the reaction is finished, cooling the resulting reaction product to room temperature and then washing, drying and grinding same, so as to obtain a zinc-doped cobalt selenide catalyst. In the method for preparing a zinc-doped cobalt selenide catalyst provided by the present invention, during the preparation process, the raw materials are readily available, the reaction conditions are mild, and a zinc-doped cobalt selenide catalyst can be obtained at a relatively low temperature, all of which are beneficial for reducing the production cost. The zinc-doped cobalt selenide catalyst prepared in the present invention has a unique rod-like structure and good electro-catalytic performance, and the obtained electrocatalyst is non-toxic and harmless, and has wide application prospects.

The invention discloses an anti-dandruff, oil-control and anti-hair loss shampoo containing hinokiol and a preparation method thereof, and belongs to the technical field of daily chemicals. The preparation method comprises the following steps: adding cocamidopropyl betaine, sodium cocoyl glycinate, modified selenium disulfide powder, sodium laureth sulfate, polydimethylsiloxane, glycerol, a preservative, sodium chloride, zinc pyrrolidonecarboxylate and deionized water into a stirring kettle, uniformly stirring at 60-80 DEG C, cooling to 35-45 DEG C, adding the natural extract and hinokiol into the stirring kettle, uniformly stirring, and cooling to room temperature. The dandruff removing, oil controlling and hair loss preventing shampoo containing hinokitiol is obtained, and the dandruff removing effect of the shampoo is improved through the cooperation of modified selenium disulfide and hinokitiol. The modified selenium disulfide takes zeolite powder particles as a matrix, has a unique porous structure and can effectively adsorb grease, dirt and the like on the scalp to make the scalp fresher, and then the outer layer of the modified selenium disulfide is coated with a layer of polydopamine, so that the stimulation to the scalp is reduced, and the hydrophilicity and dispersion stability of the modified selenium disulfide are improved.

A method for manufacturing a fused metal sight window that melts the metal of the frame around the window, instead of the traditional method of melting the window into the frame. Since most of the superior optical transparent materials (such as fused silica, sapphire, YAG, ALON, diamond, fused quartz and magnesium fluoride) have a melting point higher than most metals, it was not previously possible to create fused metal sight windows with these materials. By melting the frame onto the window, many new combinations of metals and optical materials may be used while retaining the strength of the sight window that results from fusing the metal and the window.

The invention relates to the technical field of gas sensors for detecting H2S at room temperature, in particular to a preparation method of a high-sensitivity MoSe2-based gas sensitive material for detecting H2S at room temperature. The high-sensitivity MoSe2-based gas sensitive material for detecting H2S at room temperature is prepared by synthesizing MoSe2 nanoflowers by adopting a hydrothermal method and uniformly loading In2O3 nanoparticles on the surfaces of the MoSe2 nanoflowers by adopting a mechanical mixing method. The preparation method is simple and convenient in process and low in cost, the MoSe2 / In2O3 composite material prepared by the method has a relatively high specific surface area, and an II-type p-n heterojunction interface formed by the composite material effectively promotes separation and migration of current carriers. The response to 0.05 ppm H2S, 0.1 ppm H2S, 0.25 ppm H2S, 0.5 ppm H2S and 1ppm H2S at room temperature (the gas response is calculated according to the formula R = (Rg-Ra) / Ra) is 1.37, 1.47, 1.85, 2.74 and 4.82 respectively, the response is far better than that of an existing pure-phase MoSe2 gas sensitive material, and the working temperature is lower than that of an In2O3 pure-phase material. The research provides an effective method for constructing a gas sensitive material with a large specific surface area and II type p-n heterojunction, and further promotes the development of a gas sensitive technology.

The invention provides a functional coating modified diaphragm as well as a preparation method and application thereof, and belongs to the technical field of lithium batteries. The Zn-doped transition metal selenide is used for modifying the diaphragm, CoSe2 can effectively capture lithium polysulfide and accelerate the oxidation-reduction reaction of sulfur, the CoSe2 is used as a host material to inhibit shuttling of lithium polysulfide and improve the conversion kinetics of lithium polysulfide, and good catalytic ability is shown; after Zn is doped, the concentration of cations is changed in the hydrothermal process, so that a structure which is more beneficial to catalytic reaction can be generated; and the two are combined to play a catalysis-adsorption synergistic effect, so that higher ionic conductivity and better adsorption performance are obtained, and the electrochemical performance of the lithium-sulfur battery is improved.

The invention provides a Fe2. 25Te2 at graphene electromagnetic wave-absorbing material and a preparation method and application thereof.The preparation method comprises the steps that S1, a quartz boat filled with Te blocks is placed on the upstream of a tubular furnace hot area, and the temperature of the hot area is kept at the temperature sufficient to enable Te to be smelted slowly; s2, mixing Fe2O3 powder, fused salt and graphene oxide powder according to a certain mass part ratio, uniformly grinding, thinly paving the mixture in another quartz boat, and placing the quartz boat in the central position of the hot area of the tube furnace; s3, heating the quartz boat in the S1 and the other quartz boat in the S2 at the same time, and carrying out sufficient reaction by using a molten salt assisted chemical vapor deposition technology; and S4, after the reaction in the S3 is completed, naturally cooling to obtain the tetragonal-phase Fe < 2.25 > Te2 (at) graphene broadband electromagnetic wave-absorbing material. The preparation method is simple, convenient and efficient, the product achieves broadband wave absorption through the synergistic effect of the two-dimensional Fe2. 25Te2 nanosheets and graphene, the quality is stable, and performance evaluation is high.

The invention relates to a surface-modified co-doped lithium-rich manganese-based positive electrode material and a preparation method thereof. The surface-modified co-doped lithium-rich manganese-based positive electrode material comprises a bulk phase part and a surface part, the bulk phase part is a cation co-doped lithium-rich manganese-based material, the chemical formula is Li < 1.2 > Ni < 0.17 > Co < 0.16-x > M < x > Ru < y > Mn < 0.47-y > O < 2 >, in the formula, M is at least one of V, Cr and Fe, x is more than or equal to 0.06 and less than or equal to 0.14, and y is more than or equal to 0.05 and less than or equal to 0.2; the surface part is a selenium-halogen composite modified layer coating the bulk phase part in situ, contains selenide and lithium halide, and is formed by heat treatment of a bulk phase material, a selenium source and a halogen source in an inert atmosphere. The positive electrode material provided by the invention has excellent structural stability and high lithium ion diffusion coefficient, has good interface compatibility with halide electrolyte, and has high energy density and long cycle stability when being used in a halide all-solid-state battery.

The invention relates to the technical field of preparation of electro-catalysis electrode materials, in particular to a preparation method and application of a SeO2 doped RuO2 electrolyzed water catalyst.The preparation method comprises the steps that S1, ruthenium acetate and selenium dioxide are dissolved in deionized water together and continuously stirred to obtain a mixed solution A, then sodium citrate is dissolved in deionized water, and the PH value is adjusted to be 9 with ammonia water to obtain a solution B; s2, mixing the solution A and the solution B, reacting at 80 DEG C for 12 hours, naturally cooling, ultrasonically washing with deionized water and ethanol in sequence, centrifuging, and drying in a drying oven to obtain a catalyst precursor; and S3, carrying out two-step pyrolysis on the precursor, namely heating to 250 DEG C, annealing for 4 hours, heating to 400 DEG C, annealing and heating for 2 hours, so as to obtain the SeO2-doped RuO2 nanosheet. By introducing a proper amount of SeO2 for doping, the electronic structure of RuO2 is optimized, the adsorption and desorption balance effect of the catalyst on a reaction intermediate is adjusted, the Ru site catalytic performance is improved, and the obtained SeO2-doped RuO2 nanosheet has efficient acidic OER catalytic performance.