173results about "Tungsten oxides/hydroxides" patented technology

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 lithium ion battery positive electrode material and a preparation method and application thereof. According to the lithium ion battery positive electrode material, the lithium ion battery positive electrode material has a core-shell structure, a lithium layered metal oxide, a composite double-phase coating layer and a carbon coating layer are distributed from the center to the surface of the lithium ion battery positive electrode material, and the composite double-phase coating layer is prepared from a fast ion conductor and an oxide. The lithium ion battery positive electrode material provided by the invention solves the problems of limited rate capability and poor cycling stability of a ternary material, improves the capacity retention ratio of a lithium ion battery under high-power charging and discharging conditions, inhibits interface side reaction between an electrode material and an electrolyte, and prolongs the service life of the battery. The invention also provides a preparation method and application of the lithium ion battery positive electrode material.

The invention belongs to the technical field of functional materials, and particularly relates to ultra-thick tabular tungsten oxide and a preparation method thereof.The preparation method of the ultra-thick tabular tungsten oxide comprises the following steps that S1, ammonium tungstate is added into deionized water and stirred to be dissolved at the temperature of 70-90 DEG C, and a clarified ammonium tungstate solution is obtained; s2, cooling the clarified ammonium tungstate solution to normal temperature at a cooling rate of 0.5-2 DEG C / h, and then carrying out suction filtration to obtain plate-shaped ammonium tungstate crystals; s3, calcining the tabular ammonium tungstate crystal to obtain ultra-thick tabular tungsten oxide; ammonium tungstate is adopted as a raw material, controllability is high, tungsten oxide which is uniform in particle size and complete in plate shape is obtained through optimized crystallization and calcination, the purity is larger than or equal to 99%, the problems that traditional tungsten oxide is agglomerated and disordered in shape are solved, functional adaptability is high, the plate-shaped structure can be directionally oriented, the dielectric performance, the breakdown performance and other performance are improved, and the method is suitable for multiple high-end scenes; parameters are easy to control, and operation is simple, green and safe.

The invention discloses a preparation method of high-purity nano tungsten oxide, which comprises the following steps: S1, dispersing an ammonium metatungstate crude product in ethanol to obtain a mixture, and centrifugally separating the mixture with the ammonium metatungstate crude product to obtain solid ammonium metatungstate and an impurity solution; s2, dissolving the ammonium metatungstate crude product solid ammonium metatungstate in water to obtain an ammonium metatungstate aqueous solution, and then sequentially adding a complexing agent and a chelating agent to obtain a mixed solution; s3, stirring the mixed solution with the ammonium metatungstate crude product, performing evaporative crystallization to obtain crystals, and then calcining the crystals with the ammonium metatungstate crude product to obtain the high-purity nano tungsten oxide with the ammonium metatungstate crude product; according to the method, ammonium metatungstate is primarily purified by utilizing the solubility difference of ethanol on ammonium metatungstate and water-soluble inorganic salt, transition metal impurities and alkaline earth metal ion impurities are sequentially complexed by combining a complexing agent and a chelating agent, step-by-step purification is performed, meanwhile, charge adsorption on the surfaces of particles is reduced, ammonium metatungstate agglomeration is inhibited, and the purity of the ammonium metatungstate is improved. The particle size is uniform and dispersed.

The invention discloses a method for controllably synthesizing intermediate valence tungsten oxide (WO3-x, 0.1 < = x < = 1) through a carbon reduction method, and belongs to the technical field of non-ferrous metal material preparation. The preparation method comprises the following steps: (1) mixing high-valence tungsten oxide powder with carbon powder, and carrying out uniform ball milling; and (2) putting the mixed powder under inert gas protection or vacuum conditions, and carrying out reduction reaction at high temperature. Tungsten oxide with different intermediate valence states is obtained by controlling the carbon type, the use amount, the temperature and the time. The method is suitable for precise preparation and phase structure regulation of the functional tungsten oxide intermediate, and can be used as a precursor of a new energy battery material or electrochromic and photochromic high-performance materials and the like.

The present invention relates to composite tungsten oxide particles containing a composite tungsten oxide represented by the general formula MxWyOz (wherein M element is one or more elements selected from the group consisting of alkali metal elements, alkaline earth metal elements, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I, 0.20 < = x / y < = 0.37, 2.2 < = z / y < = 3.3), and having a hexagonal crystal system, in which when observed in STEM-HAADF 0.01% to 10% inclusive of the Z contrast of W atoms is reduced to 95% or less of the average value.

The invention discloses a preparation method and application of an S-type heterostructure material with a plasma resonance effect, and the preparation method comprises the following steps: grinding a precursor material, calcining, collecting solid powder, carrying out reflux purification in deionized water, and collecting white powder; dispersing the white powder in a hydrazine hydrate solution, carrying out solvothermal reaction to obtain a faint yellow solution, repeatedly dissolving and precipitating by respectively using acidic and alkaline reagents, washing and drying to obtain a faint yellow solid product; uniformly grinding the faint yellow solid product, calcining the faint yellow solid product in an atmosphere furnace, and cooling to obtain orange solid powder; and adding the orange solid powder into an organic solvent of a precursor containing a tungsten source, and centrifuging, washing and drying after the solvothermal reaction is finished to obtain the S-type heterostructure material with the plasma resonance effect. The S-type heterostructure material with the plasma resonance effect has relatively high efficiency for simulating separation and removal of uranium species in post-treatment wastewater and shows relatively good anti-radiation stability.

The invention belongs to the technical field of tungsten and tungsten products, and particularly relates to a doped tungsten oxide composite material and a preparation method and application thereof. The invention provides a method for preparing doped tungsten oxide by a chemical precipitation method, which comprises the following steps: dispersing two aqueous solutions in the form of tiny liquid drops in an atomization manner, and carrying out chemical reaction at the moment of contact and mixing, so that rare earth element cations are rapidly combined with hydroxyl anions in an alkaline environment; the preparation method comprises the following steps: adding ammonium paratungstate into an ammonium paratungstate precursor, quickly drying at high temperature, nucleating to obtain the doped ammonium paratungstate precursor, realizing uniform distribution of rare earth elements, and calcining at high temperature to obtain the doped tungsten oxide composite material with uniform particle size. The invention aims to provide a preparation method of a short-process doped composite material powder which can be efficiently industrialized and is uniform in nanoscale particle size.

The invention relates to a method for preparing a rapid hydrochromic mesoporous tungsten oxide film based on a plasma etching technology. The preparation method comprises the following steps: mixing an amphoteric block copolymer template agent with a tungsten source precursor, and coating the surface of a substrate with obtained sol to construct an organic-inorganic hybrid film; then introducing oxygen-containing plasma to etch the hybrid film; and finally loading a catalyst layer on the surface of the film. By utilizing the synergistic effect of high-energy active particles and active oxygen species in the plasma, through coupling of physical bombardment and chemical oxidation / volatilization reaction, the rapid removal of the organic template is realized under a low-temperature condition, meanwhile, the structural integrity of a mesoporous skeleton is kept, and the pore collapse and the specific surface area loss caused by traditional high-temperature calcination are avoided. The obtained mesoporous WO3 thin film has a high specific surface area and abundant surface active sites, and hydrogen diffusion and interface reaction kinetics can be effectively improved, so that the coloring / fading response is remarkably accelerated, and the hydrogen-induced discoloration performance is improved.

A method for preparing a two-dimensional porous oxide belongs to the technical field of porous oxide preparation. The method includes the following steps: (1) using a metal salt as a precursor, an ion-intercalated two-dimensional oxide is prepared by a molten salt method; (2) the ion-intercalated two-dimensional oxide is mixed with a lithium initiator, reacted for a predetermined time, and then the unreacted lithium initiator is removed, filtered, and washed to obtain the two-dimensional porous oxide. The two-dimensional porous oxide prepared by this method forms uniform pores with a pore size range of 2-10 nm and a specific surface area of ​​200-300 m². 2 / g.

The application discloses a waste WC and W powder segmented temperature control oxygen-enriched deep oxidation process and belongs to the technical field of oxidation processes.The process comprises the following steps: first, raw material pretreatment; second, segmented oxygen-enriched oxidation; the pretreated powder is continuously fed into a segmented temperature control oxidation furnace; third, product collection; and fourth, tail gas purification; the tail gas generated in the segmented oxygen-enriched oxidation process is treated by a three-stage purification system including water washing, alkali absorption and activated carbon adsorption and then discharged. The segmented temperature control oxidation mode is adopted to divide the oxidation process into a low-temperature pretreatment section, a medium-temperature pre-oxidation section, a high-temperature deep oxidation section and a cooling and stabilizing section, and the parameters such as the temperature, oxygen-enriched concentration and residence time of each section are accurately matched to gradually promote the oxidation reaction of WC and W. In combination with a specific proportion of oxidation accelerators, the oxidation activation energy is effectively reduced, the deep oxidation of the waste WC and W powder is realized, no unoxidized WC and W residues are detected by XRD, and the problem of insufficient oxidation in the prior art is solved.

The invention discloses a low-energy-consumption solid fuel cell type oxygen sensor and a preparation method thereof. The low-energy-consumption solid fuel cell type oxygen sensor comprises a membrane electrode component, and the membrane electrode component comprises a first conductive substrate, an anode catalyst layer, a solid electrolyte layer, a cathode catalyst layer and a second conductive substrate which are sequentially stacked. The solid electrolyte layer is used for separating the anode catalyst layer and the cathode catalyst layer and conducting protons, a preparation material of the anode catalyst layer and a preparation material of the cathode catalyst layer respectively comprise carrier materials loaded with catalytic metal particles, and the anode catalyst layer is used for carrying out oxidation reaction; and the cathode catalyst layer is used for oxygen to generate electrochemical reduction reaction. The low-energy-consumption solid-state fuel cell type oxygen sensor is free of an external power supply, all-solid-state, long in service life and high in stability.

The invention discloses a method for realizing degradation of polyalkylene oxide compounds and controllable molecular weight through a promoter, which comprises the following steps: adding a photodegradation promoter into a high-molecular-weight polyalkylene oxide product, adjusting the proportion of the promoter and the proportion of effective components, and accurately controlling the shear molecular weight under the irradiation of an ozone emitter, so that the molecular weight of the polyalkylene oxide compounds is controllable. According to the invention, polyalkylene oxide with different molecular weights of 30,000-3,000,000 is prepared by using the photodegradation cocatalyst, so that the photodegradation cocatalyst can meet the requirements of customers in different fields, and meanwhile, the photodegradation cocatalyst prepared by the invention can be recycled to achieve the benefits of reducing cost and improving efficiency.

The application provides a core-shell heterogeneous gradient structure anti-ionizing radiation powder and a preparation method and application thereof, and belongs to the field of radiation protection. The preparation method of the core-shell heterogeneous gradient structure anti-ionizing radiation powder comprises the following steps: adding a high-atomic-number metal salt into deionized water, sequentially performing aging, washing, drying and primary calcination to obtain a core layer; adding the core layer and a low-atomic-number metal salt into deionized water, sequentially performing aging, washing, drying and primary calcination to obtain a preliminary wrapped powder in which a low-atomic-number metal wraps a high-atomic-number metal core layer; adding the preliminary wrapped powder and a rare earth salt into deionized water, sequentially performing aging, washing, drying, primary calcination, secondary calcination, airflow pulverization and air rotation blowing to obtain the core-shell heterogeneous gradient structure anti-ionizing radiation powder. Through the synergy of the core-shell heterogeneous structure, high-atomic-number and low-atomic-number oxides and multiple rare earth elements, the shielding performance of the material is significantly improved.

Complex tungsten oxide particles containing a complex tungsten oxide, wherein the complex tungsten oxide is represented by a general formula: MxWyOz (where an element M is one or more selected from alkali metals, alkaline earth metals, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I, 0.20≤x / y≤0.37, and 2.2≤z / y≤3.3.), the crystal system is hexagonal, when the complex tungsten oxide particles are observed via a (010) plane, the occupation ratio of the length of a side formed by a plane parallel with the c-axis among the sides surrounding the (010) plane is 60% or more.

This invention relates to an atomic-level manufacturing method and apparatus for two-dimensional metal oxide nanosheets based on controllable micro-explosion, belonging to the field of functional nanomaterials and atomic-level precision manufacturing technology. This invention uses transition metal energetic complexes and energetic oxygen compounds as metal-oxygen integrated precursors. Under the constraint of an array-type nano-confined microcavity, controllable micro-explosions are synchronously triggered by nanosecond lasers to achieve nanosecond-level stoichiometric precision in the directional self-assembly of two-dimensional metal oxide nanosheets. The preparation cycle of this invention is reduced to less than 10 minutes, and the overall energy consumption is less than 1% of that of the traditional hydrothermal method. The product has excellent specific surface area, photocatalytic and cycling performance, and is 100% compatible with existing mass production lines. It is suitable for large-scale manufacturing in fields such as photocatalysis, energy storage, gas sensors, and environmental governance.

A tungsten compound is appropriately disposed on a surface of carbon. The negative electrode material is a negative electrode material for a battery that includes amorphous carbon and sodium tungstate provided on a surface of the amorphous carbon.

The application relates to a ruthenium-tungsten oxide material and a preparation method and application thereof, and the preparation method comprises the following steps: (1) uniformly stirring water, glucose, urea, ruthenium chloride and cetyltrimethylammonium bromide to obtain solution A, and the solution is transparent, and then the solution is prepared; (2) adding tungsten chloride into ethanol and stirring to obtain solution B; (3) slowly adding solution B into solution A and uniformly stirring; (4) standing the mixed solution obtained above; (5) transferring the mixed solution obtained above into a drying box and drying; (6) calcining the dried product under an air atmosphere, annealing and cooling to room temperature to obtain the target product, i.e. the ruthenium-tungsten oxide material. Compared with the prior art, the application has the advantages of good chemical stability, excellent anti-physical structure deterioration and high tolerance to impurity ions.

The application discloses a tungsten oxide photocatalyst capable of selectively generating singlet oxygen and a preparation method and application thereof, and the preparation method comprises the following steps: S1, uniformly mixing a small molecule regulator, ethanol and water to obtain a mixed solution; S2, adding a tungsten element compound into the mixed solution to stir and dissolve, obtaining a yellow solution, and then adding the small molecule regulator until the solution turns blue; S3, placing the blue solution obtained in S2 into a hydrothermal reaction device to react, and after the reaction is completed, washing and drying the solid to obtain the tungsten oxide photocatalyst capable of selectively generating singlet oxygen. The tungsten oxide photocatalyst provided by the application can degrade various organic pollutants, and has the advantages of simple preparation method, low cost, macro-preparation, and suitability for industrial production and the like. The prepared tungsten oxide photocatalyst can be applied to the field of photocatalytic degradation of organic pollutants and the like.

The application belongs to the technical field of semiconductor gas sensitive material and sensor, and particularly relates to a selective gas sensitive material for a complex gas environment and a preparation method and application thereof. The gas sensitive material takes WO3 nanofiber as a substrate, composites ZnO nanoparticles on the surface of the substrate, and loads noble metal Ir to form an Ir-ZnO / WO3 ternary composite structure. The composite structure is obtained by adding WO3 nanofiber prepared by an electrospinning method, ZIF-8 precursor and Ir nanoparticles into an anhydrous ethanol solution, and then performing ultrasonic treatment and drying, and finally calcining under an air atmosphere. The material and the sensor exhibit high sensitivity and high selectivity to BTXs, and have good anti-interference ability and stability, and are suitable for real-time monitoring and early warning of BTXs leakage in a complex industrial site with multiple gas interference such as petrochemical industry and waste treatment.

A hafnium polyoxometalate compound-containing material of the present invention contains hafnium, an organic nitrogen compound, and a solvent, in which the ratio of an XRD maximum intensity (Ib) at a diffraction angle 2θ of 5° or more and 6° or less to an XRD maximum intensity (Ia) at a diffraction angle 2θ of 31° or more and 33° or less, Ib / Ia, in dried powder obtained by drying the hafnium polyoxometalate compound-containing material at 150°C for 15 hours in a vacuum atmosphere, is 1.2 or more. The hafnium polyoxometalate compound-containing material of the present invention contains hafnium, an organic nitrogen compound, and a solvent, in which a maximum value of transmittance in a wavelength region of 550 nm to 700 nm is 70%T or more.

The invention discloses a method for preparing a tungsten compound from artificial tungsten ore, which comprises the following steps: reacting sulfuric acid with the artificial tungsten ore to leach tungsten, and controlling the reaction conditions that the pH is 0.2-4.0, the temperature is 25-100 DEG C, the reaction time is 30 minutes to 6 hours, and the liquid-solid ratio is 1: 1-10: 1. And obtaining a metatungstate leaching solution after the reaction is completed, so that efficient leaching of tungsten is realized. And further performing purification and impurity removal on the solution to obtain a pure metatungstate solution. The pure metatungstate solution can be used for preparing different pure tungsten compound products such as solid metatungstate, phosphotungstic acid, ammonium phosphotungstate, tungsten oxide, ammonium metatungstate, ammonium paratungstate and tungstic acid. According to the technology, efficient leaching of tungsten under the mild condition can be achieved, high acid and high alkali are not needed in the whole process, and energy consumption and emission are greatly reduced; the obtained leachate is easy to purify to obtain a pure metatungstic acid solution, and the pure metatungstic acid solution can be directly used as a platform intermediate to flexibly prepare various tungsten chemicals.

Provided are near-infrared absorbing material particles containing particles of a composite tungsten oxide represented by the general formula MxWyOz (where the M element is one or more elements selected from H, He, alkali metals, alkaline earth metals, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I; W is tungsten; O is oxygen; 0.001≤x / y≤1; and 3.0<z / y).

The invention provides a ternary positive electrode material, a preparation method thereof and an electrochemical device. The ternary positive electrode material comprises a base material and a composite coating layer located on the outer layer of the base material, the base material comprises a ternary active substance, the composite coating layer contains Li2TiO3 and potassium-doped lithium tungsten bronze, the potassium-doped lithium tungsten bronze is a non-stoichiometric ratio compound, and the particle crushing index IC of the ternary positive electrode material meets the condition that IC is larger than or equal to 0 and smaller than or equal to 0.40. The composite coating layer of the ternary positive electrode material can improve the lithium ion conductivity of the ternary positive electrode material, can effectively relieve and disperse the stress on particles on a positive electrode plate in the charging and discharging process of a lithium battery using the ternary positive electrode material, and reduces the risk that the particles of the ternary positive electrode material are broken in the use process of the lithium battery; and the lithium battery has excellent storage performance.

The invention discloses a WOx-WS2 metal-ligand composite material and a preparation method and application thereof, and belongs to the technical field of potassium ion battery motor materials.The preparation method comprises the steps that an ethanol solution of 2-methylimidazole is added into an ethanol solution of a tungsten source, stirring reaction is conducted, solvothermal reaction, washing, vacuum drying and heat treatment are conducted, WOx is obtained, and the WOx-WS2 metal-ligand composite material is obtained. And performing vulcanization reaction on the WOx and a sulfur source in an inert gas environment to obtain the WOx-coated WS2 metal-ligand composite material. The prepared product has a unique metal-ligand structure, can provide more active sites for storage of K < + > in the charge-discharge process, and enhances the storage capacity of K < + >, so that the material can show relatively high capacity. The insertion capability and the storage speed of potassium ions in the electrode material are remarkably improved, so that the electrode material can show excellent rate capability. The synthesis temperature is low, and the synthesis path and reaction conditions are simple; the reaction is easy to control, post-treatment is not needed, and the method is environment-friendly and suitable for large-scale production.

There are provided a near-infrared shielding material fine particle dispersion body, a near-infrared shielding body, and a near-infrared shielding laminated structure containing composite tungsten oxide that exhibits more excellent near-infrared shielding function than that of a conventional near-infrared shielding material fine particle dispersion body, near-infrared shielding body, and near-infrared shielding laminated structure, and a method for producing the same. Also, there is provided a near-infrared shielding material fine particle dispersion body in which near-infrared shielding material fine particles are dispersed in a solid medium. The near-infrared shielding material fine particles are composite tungsten oxide fine particles containing a hexagonal crystal structure, in which a lattice constant of the composite tungsten oxide fine particles is 7.3850 Å or more and 7.4186 Å or less on the a-axis, and 7.5600 Å or more and 7.6240 Å or less on the c-axis, and a particle size of the near-infrared shielding material fine particles is 100 nm or less.

The invention discloses a preparation method and device for a two-dimensional mesoporous tungsten oxide gas-sensitive material, relates to the technical field of preparation of gas-sensitive materials, and aims at the design bottleneck of the current metal oxide semiconductor (MOS) gas-sensitive material. According to the invention, doping of rare earth elements (Ce, Er and Pr), modification of specific functional groups (-F,-OH,-SO3H and-NH2) inside and outside pore channels and modification of Pt nanocrystals are realized by using a beaker internally provided with a driving mechanism and a stirring mechanism, and preparation of a two-dimensional mesoporous tungsten oxide-based nanosheet (PP-2D-mpR / WO3) gas sensitive material with a specific pore diameter (10-15 nm) and a thickness (12-20 nm) and a device are realized. Based on the advantages that two-dimensional mesoporous tungsten oxide (2D-mpWO3) is large in specific surface area, ideal in mass transfer behavior, high in carrier transmission rate, highly ordered in structure, uniform in oxygen vacancy type and charge environment and the like, the response value is enhanced, the adsorption capacity of oxidation products is reduced and the recovery time is shortened through the sensitization effect of Pt nano particles with large sizes in pore channels; and the method can be expanded to high-resolution sensitive detection of other trace weak polar molecules.

The invention discloses a gold nanoparticle modified ordered crossed tungsten oxide nanowire array material, which is characterized in that gold nanoparticles are uniformly distributed on the surfaces of tungsten oxide nanowires, and the plasmon effect of the gold nanoparticles is utilized to enhance the gas-sensitive property, so that the gas-sensitive property is improved. The gold nanoparticle modified ordered crossed tungsten oxide nanowire array material can be applied to a gas sensor, active sites can be increased, the gas sensitivity of the material can be improved, the working temperature can be reduced, the energy consumption can be reduced, the sensitivity of recognizing 50ppm NO2 gas at the optimal working temperature under three sunlight intensities can reach 606.8, and the recovery time and the response time are 20s and 81s respectively.