195 results about "Tungsten trioxide" patented technology

The invention discloses a method for preparing a single-layer tungsten diselenide nanoband based on a space confinement strategy. By changing the flow and the growth time of hydrogen, effective control on the width and the thickness of a nanoband can be realized. The method comprises the following steps: uniformly spraying tungsten trioxide powder to one substrate, then covering the substrate by the other substrate, and forming micro reaction space which is of a 'sandwich'-like structure. Growth of a tungsten diselenide nanoband is carried out by utilizing a constant-pressure chemical vapor deposition method; physicochemical characteristics of a one-dimensional transition metal chalcogenide strongly depend on suspension key types on the edge of the one-dimensional transition metal chalcogenide, metallic properties are displayed by an ultranarrow band, and conversion from the metallic properties to semiconductor properties can be displayed from the edge to the center of a wider band; the tungsten diselenide nanoband is widely applied to micro-nano photoelectric devices due to the special property; industrial production of the tungsten diselenide nanoband can be realized through an experimental method of the invention.

The invention relates to the technical field of ceramic substrates, and provides a bending-resistant multilayer ceramic substrate and a preparation method thereof.The bending-resistant multilayer ceramic substrate is prepared from, by weight, 100 parts of aluminum oxide, 2-4 parts of a sintering aid, 1-2 parts of a plasticizer, 1-2 parts of a reinforcing agent, 1-3 parts of a dispersing agent, 8-12 parts of a binder and 85-90 parts of water; the reinforcing agent comprises tungsten trioxide and cobaltosic oxide. According to the technical scheme, the problem of low bending strength of the multilayer ceramic substrate in the prior art is solved.

The invention discloses a novel photocatalyst for producing hydrogen from organic matter wastewater and a preparation method of the novel photocatalyst, and relates to the technical field of photocatalysis. The photocatalyst disclosed by the invention is combined with oxidation-reduction capability, and can effectively degrade and produce hydrogen under the irradiation of sunlight. Through combination of quaternized porous tungsten oxide and vanadate radicals, silver vanadate load growth is promoted, the sunlight utilization rate is increased, and the electron-hole recombination rate is reduced. Reduced graphene oxide is used for pretreatment, active groups are introduced, the reduced graphene oxide is compounded with tungsten oxide / silver vanadate, the binding force is enhanced through heat treatment, photo-induced electron-hole pair compounding is inhibited through the conductivity, and the visible light catalytic performance is improved. The adsorption effect of porous tungsten trioxide and reduced graphene oxide can accelerate the degradation of organic matters. By optimizing the proportion of silver vanadate, tungsten oxide and reduced graphene oxide, the visible light response and charge separation efficiency are enhanced, the degradation and hydrogen production performance is improved, and light corrosion is reduced.

The present invention provides an electrochromic fabric and a preparation method thereof. The conductive fabric is treated to make its surface rich in active functional groups; oxalic acid and sodium tungstate solution are mixed, hydrochloric acid is added to adjust the pH, and then n-butanol is added to obtain a precursor solution. The fabric is placed in the precursor solution for high-temperature reaction to obtain the electrochromic fabric. By pre-treating the fabric, the number of functional groups on the fabric surface is increased, and adjusting the pH enhances the binding force between WO3 and the fabric; n-butanol ensures the stable formation of tungsten trioxide, promotes the interaction between oxalic acid and the functional groups on the fabric surface, improves the interfacial interaction force between the WO3 crystal nucleus and the fabric, and at the same time affects the crystal nucleus growth direction, forming a nanorod-like or three-dimensional microsphere structure, and improving the electrochromic performance. Through the synergistic cooperation of each process and related parameters, the electrochromic fabric of the present invention has obvious color change, good cycle stability and high mechanical properties; and the process is simple, the cost is low, and it is suitable for industrial mass production.

The invention provides a rapid preparation method of tungsten trioxide, which specifically comprises the following steps: step 1, weighing crude tungstic acid, dissolving in ammonia water, heating and stirring to obtain an ammonium tungstate solution; step 2, slowly dropwise adding the ammonium tungstate solution in the step 1 into a poor solvent to obtain an ammonium paratungstate suspension, and step 3, filtering the ammonium paratungstate suspension in the step 2 to obtain an ammonium paratungstate filter cake, and leaching the ammonium paratungstate filter cake with the poor solvent; 4, the ammonium paratungstate filter cake in the step 3 is placed in a drying oven to be dried; and (5) roasting the ammonium paratungstate filter cake in the step (4) at high temperature to obtain a faint yellow irregular flaky tungsten trioxide product. According to the preparation method, a mixed solvent crystallization and high-temperature roasting two-step process is adopted, the solubility of ammonium tungstate in water is reduced by adding a poor solvent, so that an ammonium tungstate solution rapidly reaches a saturated state and is separated out, the crystallization process of ammonium paratungstate is accelerated, and the preparation speed and the crystallization rate of a tungsten trioxide product are high.

The invention provides a high-dispersity polypropylene primary color master batch as well as a preparation method and application thereof, and relates to the technical field of polypropylene, the high-dispersity polypropylene primary color master batch comprises the following components in parts by weight: 1-20 parts of pigment, 55-74 parts of polypropylene, 1-3 parts of nano titanium dioxide, 1-3 parts of nano silver, 1-3 parts of tungsten trioxide and 2-5 parts of dispersing agent. 1-3 parts of a phosphate heat stabilizer and 0.5-2 parts of an antioxidant. Through the composite synergistic effect of nano titanium dioxide and nano silver and other nano materials, the uniform dispersion performance of the polypropylene color master batch in a base material is improved, pigment agglomeration is effectively prevented, and the color consistency of a final product is ensured; functional components such as tungsten trioxide and nano zirconium oxide are introduced, so that the heat resistance and the ultraviolet aging resistance of the polypropylene product are enhanced, and the polypropylene keeps stable color under long-term outdoor use conditions and is not easy to fade and degrade.

The invention discloses a modified lithium-rich manganese-based positive electrode material and a preparation method thereof, a pole piece and a battery, and the preparation method comprises the following steps: S1, mixing a lithium-rich manganese-based material with tungsten trioxide, and calcining for the first time to obtain an LRM-coated WO3 material; and S2, mixing the LRM-coated WO3 material with aluminum fluoride, and carrying out secondary calcination to obtain the modified lithium-rich manganese-based positive electrode material. According to the scheme, the modified lithium-rich manganese-based positive electrode material is prepared through combination of chemical bond regulation and phase structure design, the problem that the high-temperature performance of a traditional lithium-rich manganese-based material is degraded is solved, and a new thought is provided for development of a high-energy-density lithium ion battery.

The invention relates to a multi-element synergistic doped ATO target material and a preparation method thereof. Comprising the following steps: 1) uniformly mixing water and a powder dispersant, then adding an oxide 1 (at least one of tantalum pentoxide, niobium pentoxide, vanadium pentoxide, gallium oxide and tungsten trioxide), an oxide 2 (at least one of zinc oxide, copper oxide, cobalt oxide, manganese oxide and cerium oxide) and ATO raw material powder, and mixing and homogenizing to prepare slurry; 2) grinding the slurry and adding a powder forming adhesive; 3) carrying out spray drying granulation on the ground slurry; according to the preparation method, the ATO target material with high compactness (relative density gt, 98.5%) and low resistance (resistivity lt, 5 * 10 <-3 > omega.cm) is prepared through multi-element synergistic doping of the oxide, and the problem that compactness and conductivity of the ATO target material are difficult to consider at the same time in the prior art is solved.

The invention discloses a tungsten trioxide electrochromic film for multi-tungsten oxygen cluster induced in-situ crystallization as well as a preparation method and application of the tungsten trioxide electrochromic film. The preparation method comprises the following steps: S1, adding hydrochloric acid into a sodium tungstate dihydrate aqueous solution to obtain a precipitate; washing the precipitate until the pH value of the supernate is greater than 3, and then drying the precipitate to obtain hydrated tungstic acid powder; dissolving the hydrated tungstic acid powder in a hydrogen peroxide solution to obtain a peroxy tungstic acid solution; s2, heating, evaporating and concentrating the peroxy tungstic acid solution to obtain a precursor solution containing multi-tungsten-oxygen clusters; and transferring the precursor solution containing the multi-tungsten-oxygen cluster to a substrate by adopting a film coating process, and annealing to obtain the tungsten trioxide electrochromic film with multi-tungsten-oxygen cluster induced in-situ crystallization, a matrix of the tungsten trioxide electrochromic film for multi-tungsten-oxygen cluster induced in-situ crystallization is amorphous tungsten trioxide, and hexagonal-phase tungsten trioxide nanocrystals are dispersed and distributed in the amorphous tungsten trioxide.

The invention discloses a method for preparing a tungsten trioxide low-platinum electrocatalyst with a core-shell structure through pulse Joule heating, and belongs to the field of electrochemical catalysts for electrolysis of water. The invention aims to solve the problems that controllable amorphization is difficult to realize on the WO3 surface and a crystal nucleus-amorphous shell composite structure cannot be effectively constructed in the prior art. The preparation method comprises the following steps: 1, preparing a tungsten trioxide carrier with a core-shell structure; and 2, loading a platinum source. The method is used for preparing the tungsten trioxide low-platinum electrocatalyst with the core-shell structure through pulse Joule heating.

The invention relates to the technical field of electrode materials, in particular to a compaction-resistant ultrahigh-nickel high-entropy positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out a co-precipitation reaction on a mixed salt solution and a mixed nano metal oxide sol under an alkaline condition to obtain a precursor; and mixing the precursor, a high-hardness nano metal oxide and a lithium source, and sintering to obtain the compaction-resistant ultrahigh-nickel high-entropy positive electrode material, the mixed salt solution comprises Ni < 2 + >, Co < 2 + > and Mn < 2 + >; the nano metal oxide in the mixed nano metal oxide sol comprises at least three of nano aluminum oxide, nano zirconium oxide, nano titanium dioxide and nano magnesium oxide; the high-hardness nano metal oxide comprises one or more of nano zirconium oxide, nano titanium dioxide, nano tungsten trioxide and nano niobium pentoxide. The compaction-resistant ultrahigh-nickel high-entropy positive electrode material prepared by the preparation method provided by the invention is uniform in granularity and high in compression resistance.

The invention relates to the field of sensors, and discloses an acoustic sensor and a preparation method thereof. The acoustic sensor comprises an upper support body, an acoustic sensing layer and a lower support body; the acoustic sensing layer comprises a first electrode layer, a flexoelectric material layer and a second electrode layer which are stacked in sequence; the flexoelectric material layer contains a two-dimensional layered material and an ion regulator; the two-dimensional layered material is selected from at least one of graphene oxide, boron nitride, vermiculite, molybdenum disulfide, tungsten diselenide, tungsten disulfide, black phosphorus, Mxene, molybdenum ditelluride and tungsten trioxide; the ion regulator is selected from one or more than two of polystyrolsulfon acid, polyethylene glycol, poly (diallyldimethylammonium chloride), carboxyl ethylene copolymer, polyethylene sulfonic acid, polymethylacrylic acid, polyethylene phosphoric acid, polyvinylamine, sodium alginate, silk fibroin and carboxylated nanofiber. The acoustic sensor operates by using the flexoelectric effect, and has higher sensitivity and high Young modulus.

The invention relates to a method and device for preparing urea through photocatalysis and piezoelectric catalysis of CO2, and the method comprises the following steps: adding a catalyst into water, introducing CO2 and N2 into the water, and reacting under the action of illumination and ultrasonic waves to obtain a urea solution; the light intensity of illumination ranges from 200 mW / cm < 2 > to 300 mW / cm < 2 >; the catalyst is selected from one or more of CdS (cadmium sulfide), ZnO (zinc oxide), WO3 (tungsten trioxide), BiOCl (bismuth oxychloride) and Bi4NbO8Cl (bismuth oxychloride). The technical problem to be solved is to provide a method for preparing urea by photocatalysis and piezoelectric catalysis of CO2, according to the method, under the action of illumination, ultrasonic waves and a catalyst, photocatalysis and piezoelectric catalysis of CO2 are combined, urea synthesis can be carried out at normal temperature and normal pressure, the yield of urea can be improved, and a new direction is developed for green and efficient synthesis of urea. Furthermore, the device can integrate air carbon capture coupling photocatalysis and piezoelectric catalysis CO2 preparation of urea into a set of continuous device, a large amount of energy input is not needed, multi-step separation can be avoided, the device is simple, and the cost can be greatly reduced.

The invention discloses high-transmittance wear-resistant antibacterial dry granules, glaze, a ceramic tile and a preparation method thereof, and belongs to the technical field of building materials. The high-transmittance wear-resistant antibacterial dry granules are prepared from the following raw materials in parts by mass: 15 to 25 parts of potassium feldspar, 12 to 20 parts of lithium feldspar, 6 to 12 parts of dolomite, 4 to 12 parts of calcined soil, 2 to 10 parts of corundum, 0.2 to 1.0 part of silver oxide, 0.2 to 1.0 part of tungsten trioxide, 2 to 6 parts of zinc oxide, 20 to 30 parts of cubic boron nitride and 5 to 15 parts of aluminum nitride. The high-transmittance wear-resistant antibacterial dry granules are obtained by firing raw materials at 1500-1600 DEG C, preserving heat for 30-60 minutes and then quenching, wherein water for quenching is circulating cooling water. A glaze layer and a high-transmittance wear-resistant ceramic tile prepared from the high-transmittance wear-resistant antibacterial glaze added with the high-transmittance wear-resistant antibacterial dry particles are good in transparency and color development and high in hardness and wear-resistant grade, and meanwhile, the glaze layer and the high-transmittance wear-resistant ceramic tile have the antibacterial performance.

The invention discloses a tungsten-doped high-nickel cobalt-free material and a preparation method thereof, belongs to the technical field of lithium ion battery materials, and solves the problems that an existing high-nickel cobalt-free material is poor in electrochemical performance and poor in effect when serving as a lithium ion battery positive electrode material. The chemical general formula is Li (Ni0. 9Mn0. 1) xW1-xO2, and the preparation method comprises the following production steps: preparing a high-nickel low-manganese mixed salt solution, adding a proper amount of a reaction base solution into a reaction kettle, keeping the internal temperature of the reaction kettle constant, pumping the high-nickel low-manganese mixed salt solution, an ammonia water complexing agent solution and an alkali solution into the reaction kettle, carrying out a co-precipitation reaction, aging the obtained precursor mixed solution, and drying to obtain the nickel-nickel low-manganese composite material. The preparation method comprises the following steps: filtering, washing and drying to obtain precursor powder, mixing the precursor powder with a lithium source and tungsten trioxide powder, putting the mixed powder into a sintering furnace, and preparing the material by adopting a two-stage sintering process. The method saves time and labor, is high in adaptability, improves the electrochemical stability, reduces the production cost, and realizes the performance enhancement of the positive electrode material of the lithium ion battery.

The invention discloses a surface plasmon resonance (SPR) hydrogen sensor based on an Ag / PDMS / Pt-WO3 multilayer structure. The SPR hydrogen sensor is characterized by comprising a halogen lamp light source, two sections of multimode optical fibers, a spectrometer and an SPR hydrogen sensing head, wherein the SPR hydrogen sensing head is composed of a different-core structure formed by multimode-single-mode-multimode optical fibers, a silver film, PDMS (polydimethylsiloxane) and Pt-WO3 (platinum-tungsten trioxide). The SPR hydrogen sensor based on the Ag / PDMS / Pt-WO3 multi-layer structure, which is simple to prepare, high in sensitivity and capable of being repeatedly used for a long time, is provided aiming at the defects that an existing optical fiber SPR hydrogen sensor is low in sensitivity and complex in device manufacturing, and PdH is changed from an alpha phase to a beta phase when Pd is used as a hydrogen sensitive material, so that the use of the device is influenced, and the like. When the hydrogen concentration is increased, the Pt-WO3 reacts with the hydrogen to generate heat, so that the refractive index of the PDMS film is changed, the SPR resonance spectrum is moved, and the hydrogen concentration is obtained by observing the offset of the PDMS film. The high refractive index sensitivity of SPR is brought into full play by utilizing the high refractive index change of PDMS, so that high-precision detection of hydrogen leakage is realized.

The invention discloses a width gradient tungsten disulfide nanobelt, a preparation method thereof and an application of the width gradient tungsten disulfide nanobelt in a self-driven photoelectric detector, a Ni film is deposited on a substrate and is annealed to form catalytic particles, and a chemical vapor deposition system is utilized to accurately control the temperature gradient between tungsten trioxide in a central temperature zone and a growth substrate in a downstream temperature zone, so that the width gradient tungsten disulfide nanobelt is obtained. And the solid sulfur source is propelled at a constant rate, the dynamic change of the sulfur / tungsten atomic ratio in the reaction environment is regulated and controlled, and a growth mode is guided to be converted from a gas-liquid-solid mechanism to a gas-solid mechanism, so that controllable preparation of the tungsten disulfide nanobelt with the width continuously and progressively decreased in the axial direction is realized. The width of the nanobelt gradually changes from 150-500 nm to 50-120 nm, the length of the nanobelt reaches 3-12 [mu] m, and the nanobelt has an armchair edge and a 3R phase stacking structure. A self-driven photoelectric detector constructed based on the nanobelt realizes high-sensitivity detection of 532 nm laser under zero bias voltage, the responsivity reaches 5.04 A / W, the detectivity reaches 3.23 * 10 < 12 > Jones, and the nanobelt shows important application value in the fields of optical signal detection, optical switches and wireless optical communication.

This invention belongs to the field of target material preparation technology, and discloses a sintering method for a yellow tungsten oxide titanium target and the yellow tungsten oxide titanium target itself. The sintering method for the yellow tungsten oxide titanium target includes the following steps: Step 1: Heating the tungsten oxide titanium target blank to 800℃ at a heating rate of 0.5-1℃ / min, with continuous oxygen flow during the process at an oxygen flow rate of 15-20L / min; Step 2: Heating from 800℃ to 1150℃-1200℃ at a heating rate of 2-3℃ / min, holding at this temperature for 1-3 hours, with continuous oxygen flow during the process at an oxygen flow rate of 40-60L / min. This invention discloses a sintering method for a yellow tungsten oxide titanium target, employing a two-stage heating approach. In the first stage of heating, a lower heating rate and lower oxygen flow rate are used to improve the density of the target material; in the second stage of heating, a higher heating rate and higher oxygen flow rate are used to avoid deactivation of tungsten trioxide, which could lead to a change in the valence of tungsten.

The invention discloses a preparation method of a high-sensitivity room-temperature flexible hydrogen sulfide gas sensor, which comprises the following steps: preparing a laser-induced graphene interdigital electrode in one step by using a carbon dioxide laser, depositing tungsten trioxide microspheres on the surface of LIG by using a film pressing technology so as to construct the hydrogen sulfide gas sensor, and forming a P-N heterojunction with the LIG, thereby obtaining the high-sensitivity room-temperature flexible hydrogen sulfide gas sensor. The response amount of the sensor is greatly improved through the heterojunction structure, the theoretical detection limit is as low as 774 ppt, and the actual detection limit is 3 ppb. The preparation method of the high-sensitivity room-temperature flexible hydrogen sulfide gas sensor provided by the invention has the advantages of high sensitivity, working at room temperature, low detection limit and long-term stability of more than seven months, and can be widely applied to the field of wearable gas monitoring.

The invention discloses a p-type tungsten disulfide nanotube bundle, a preparation method thereof and application of the p-type tungsten disulfide nanotube bundle in a photoelectric detector with adjustable light response linearity, and the method comprises the following steps: depositing an Au film on a SiO2 / Si substrate, and carrying out annealing to form a zero-dimensional Au nanoparticle catalytic layer; the method comprises the following steps: respectively placing tungsten trioxide (WO3) powder and sulfur (S) powder in different areas of a single-temperature-area tubular furnace, heating to 850-1000 DEG C in an Ar / H2 mixed gas low-pressure atmosphere, and reacting to generate a WS2 nanotube bundle with a multi-wall hollow structure; the obtained material has a cluster-shaped morphology in dense interlaced distribution, and shows stable p-type conductive characteristics. A photoelectric detector prepared based on the material has high responsivity (2.7 * 10 < 4 > A / W), high detection rate (1.6 * 10 < 13 > Jones) and quick response (15 ms) in a wave band of 375-1550 nm, and keeps stable performance in a range of 10-300 K. The method is simple in process, the growth process of the tungsten disulfide nanotube bundle can be accurately controlled, the polarity of tungsten disulfide is changed to be p-type, and large-scale preparation can be achieved.

The application discloses a nickel-based flux-cored wire and a preparation method and application thereof. The nano tungsten trioxide is introduced into the nickel-based flux-cored wire, the high-temperature strength and hot strength of the nickel-based alloy are improved, meanwhile, the hardness, friction performance and corrosion resistance of the alloy are improved, and the problems of low high-temperature corrosion strength, hot strength and mechanical performance of the nickel-based flux-cored wire are solved.

The application relates to a preparation method of Mg and W double-element co-modified ultra-high-nickel binary positive electrode material, in particular to Mg and W double-element co-modified high-nickel binary positive electrode material. 0.01 (Ni x Mn y )W z O2, wherein x the value of x is 0.9-0.95, y the value of y is 0.05-0.1, z the value of z is 0.003-0.006. The method comprises the following steps: (1) preparing a nickel and manganese metal salt aqueous solution, a mixed alkali aqueous solution and a reaction bottom solution; (2) respectively adding the metal salt aqueous solution and the mixed alkali aqueous solution into the bottom solution at a certain flow rate to perform a constant-temperature precipitation reaction in a nitrogen atmosphere; (3) after the precipitation reaction is completed, cooling to room temperature, filtering, washing and drying the precursor; (5) after the dried precursor is mixed with metered lithium salt, magnesium oxide and tungsten trioxide, high-temperature solid-phase reaction is performed in an oxygen atmosphere to obtain the Mg and W double-element co-modified ultra-high-nickel binary positive electrode material. The Mg and W double-element co-modified high-nickel binary positive electrode material prepared by the method has a specific capacity of 179.19 mAh / g after 100 cycles at a 0.5C rate, a capacity retention rate of 93.1% or above, and good cycle and rate performance.

A negative electrode material is a negative electrode material for a battery, and the material includes carbon, tungsten trioxide formed on the surface of the carbon, and silicon formed on the surface of the carbon.

A thin-film photovoltaic module with dimming function and its preparation method, belonging to the field of photovoltaic power generation, includes transparent conductive glass, an electron transport layer, a semi-transparent perovskite light-absorbing layer, a hole transport layer, an electrode layer, a dimming film layer and a metal oxide conductive layer stacked in sequence on the transparent conductive glass; the dimming film layer adopts a liquid crystal layer and / or a tungsten trioxide layer; this solution integrates two dimming function layers, the liquid crystal layer and the tungsten trioxide layer, and can control the transparency of the two dimming layers separately or jointly by adjusting the temperature of the liquid crystal layer or applying an external electric field to it, and applying an external electric field to the tungsten trioxide layer, thereby achieving more precise light transmittance adjustment.

The invention discloses an amorphous electrochromic film inlaid with Cs-doped tungsten trioxide quantum dots as well as a preparation method and application of the amorphous electrochromic film. The preparation method comprises the following steps: S1, adding hydrochloric acid into a sodium tungstate dihydrate aqueous solution to obtain a precipitate; washing the precipitate until the pH value of the supernate is greater than 3, and then drying the precipitate to obtain hydrated tungstic acid powder; dissolving hydrated tungstic acid powder in a hydrogen peroxide solution to obtain a peroxy tungstic acid solution, and then adding a substance containing a Cs element to obtain a Cs-peroxy tungstic acid solution; the molar ratio of Cs ions to W ions in the Cs-peroxotungstic acid solution is not less than 1: 100 and less than 5: 100; s2, heating, evaporating and concentrating the Cs-peroxy tungstic acid solution to obtain a precursor solution containing a bimetal oxygen cluster; and transferring the precursor solution containing the bimetal oxygen clusters to a substrate by adopting a film coating process, and annealing to obtain the amorphous tungsten trioxide electrochromic film inlaid with the Cs-doped tungsten trioxide quantum dots.

The invention discloses a tungsten nitride / carbon composite material as well as a preparation method and application thereof. The preparation method adopts a molten salt synthesis method and takes tungsten trioxide as a tungsten source, thiourea as a nitrogen source and a sulfur source, melamine resin as a carbon source and sodium chloride as a molten salt template. Under the room temperature condition, powder obtained through ball milling is subjected to high-temperature roasting through a tubular furnace to prepare the tungsten nitride and carbon composite material, and the pore channel structure and the heteroatom content of the material can be adjusted by controlling the proportion of precursors. The product yield of the method reaches 16%, and the material can be used as the water electrolysis hydrogen production catalyst, and is a very ideal method for preparing the water electrolysis hydrogen production catalyst.

The present invention discloses a novel photoelectrocatalytic material and preparation method for forming a heterojunction between cobalt-nickel doped tungsten trioxide and zinc ferrite. The experiment prepared a photoelectrocatalyst forming a heterojunction between cobalt-nickel doped tungsten trioxide and zinc ferrite through precise three-step hydrothermal and passivation treatment. The heterojunction preparation method is as follows: first, deionized water, sodium tungstate dihydrate, potassium oxalate, cobalt nitrate hexahydrate, and nickel chloride hexahydrate are mixed and stirred to obtain a precursor through a hydrothermal method; then, the precursor is dried and sintered to obtain cobalt-nickel doped tungsten trioxide; then, a zinc ferrite film is prepared by mixing ferric chloride hexahydrate, sodium nitrate, and zinc nitrate hexahydrate through a secondary hydrothermal method, sintering, and soaking in sodium hydroxide; finally, a nickel-iron oxide passivation layer is loaded through a hydrothermal method. Compared with ordinary zinc ferrite, the heterojunction formed by the cobalt-nickel doped tungsten trioxide loaded with the zinc ferrite film has significant advantages such as excellent performance, excellent photocorrosion resistance, and stable performance.

The invention belongs to the technical field of target materials, and particularly relates to a tin oxide-based composite target material and a preparation method thereof. The tin oxide-based composite target material provided by the invention comprises tin oxide, doped oxides and sintering aids, the doped oxides are antimony pentoxide, vanadium pentoxide, nickel oxide and tungsten trioxide, and the sintering aids are magnesium oxide and yttrium oxide. The antimony pentoxide, the vanadium pentoxide, the nickel oxide and the tungsten trioxide are used as doped oxides, so that the electrical and optical properties of the target material are effectively improved; magnesium oxide and yttrium oxide are adopted as sintering aids, grains are refined, and the compactness and the mechanical property of the target material are improved; atomic-scale mixing of part of elements is achieved through a sol-gel method, then atomic-scale doping is conducted through a high-energy ball milling method, the distribution deviation of the elements in a matrix is reduced, sintering is conducted through a discharge plasma furnace, and the volatilization loss of the elements and the pore defect in the target material are reduced.

The invention discloses a manganese-based oxybromide-tungsten oxide composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a precursor solution containing manganese-based halide, manganese-based inorganic salt and tungsten trioxide; soaking a conductive substrate in the precursor solution or dispensing the precursor solution on the conductive substrate; carrying out heating treatment at 160-300 DEG C; and burning in vacuum. The manganese-based oxybromide-tungsten oxide composite material provided by the invention is not only low in preparation component cost, but also excellent in acid oxygen evolution electrocatalytic activity and long-term stability, and has an application prospect in the field of large-scale hydrogen production.

The invention belongs to the technical field of recycling of rare and noble metal secondary resources, and discloses a method for preparing a tungsten compound and chloroplatinate from a waste catalyst and application of the method. The method comprises the following steps: (1) firing and crushing the waste catalyst, (2) reacting the waste catalyst with acid, (3) filtering and discarding filtrate, (4) reacting the precipitate with ammonia water, filtering to obtain an ammonium tungstate solution, and retaining filter residues; (5) concentrating the ammonium tungstate solution, crystallizing, separating and drying to obtain an ammonium paratungstate finished product; and (6) reacting the filter residues retained in the step (4) with aqua regia to prepare chloroplatinate. And (7) firing the ammonium paratungstate at a high temperature to obtain tungsten trioxide. According to the method, tungsten and platinum can be effectively separated from the carrier, and the recovery rate of rare and precious metals is increased.