25results about "Selenium/tellurium compunds" 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 present invention discloses a preparation method and application of a class of silver nanocluster-embedded niobium polyacid crystalline materials with immunological activity, belonging to the technical field of pharmaceutical synthesis. The chemical formula of the silver nanocluster-embedded niobium polyacid crystalline materials with immunological activity is L x [Ag 30 Cl y (SeO3) (8‑y) (SiNb 18 O 54 )6]·zH2O; wherein, L is a counter cation or cationic group, 1 < x ≤ 70, 0 < y ≤ 8, 1 < z ≤ 150; the overall cluster structure of the silver nanocluster-embedded niobium polyacid crystalline materials with immunological activity is composed of the [Ag 30 Cl y (SeO3) (8‑y) (SiNb 18 O 54 )6] anion cluster and the corresponding counter cation or cationic group; this material has good water solubility and stability under physiological conditions, has high cytotoxicity and selectivity for tumor cells, especially CT26 colon cancer cells, can induce immunogenic death of tumor cells and activate the body's immune system, has little toxic and side effects on normal cells and organs, and has better biosafety than the traditional chemotherapeutic drug doxorubicin, and can be used as an anti-tumor immunotherapy drug in the biomedical field.

The application relates to application of Bi2O2Se in a photocatalytic nitrogen fixation reaction and belongs to the technical field of photocatalytic nitrogen reduction. The BOS catalyst with intrinsic weak hole oxidation capacity realizes efficient and stable photocatalytic ammonia synthesis without a sacrificial agent. The BOS has an optimized narrow band gap structure and a unique straddling energy band arrangement, the valence band position is shallow, the hole oxidation capacity is weak, the oxidation degradation of NH4 + Can be effectively inhibited, and the conduction band position is suitable, so that the thermodynamic driving force of nitrogen reduction is ensured. The catalyst has excellent light absorption capacity in a wide spectral range (extending to the near-infrared region), and the apparent quantum efficiency reaches 0.12% at a wavelength of 700 nm. The ammonia synthesis rate of the BOS without a sacrificial agent reaches 61 muM.h ‑1 -1, which is 8.3 times and 2.8 times that of carbon nitride and cadmium sulfide, and the catalyst maintains high activity in an air atmosphere, has excellent oxygen compatibility and cycle stability.

The application relates to a preparation method of a ternary alloy nanoflower and an organic hybrid composite film thereof, and belongs to the technical field of nanometer materials and functional films. BiCl3, SbCl3 and TeO2 are dissolved in ethylene glycol, NaOH and PVP K30 are added, stirring is carried out at room temperature until a clear solution is obtained, the solution is transferred to a reaction kettle, and reaction is carried out in a blast drying oven; after cooling, centrifugal washing is carried out; after drying, a Bi-Sb-Te alloy nanoflower is obtained; the Bi-Sb-Te alloy nanoflower is mixed with a PEDOT:PSS aqueous solution; a conductive enhancer is added, ultrasonic dispersion is carried out to form a uniform slurry; the slurry is deposited on the surface of a glass substrate by using a drying machine through a flow casting method; after annealing, the film is peeled off, vacuum drying is carried out, and a flexible thermoelectric composite film is formed. Through the establishment of a trinity technology of "nanoflower morphology design-in-situ interface optimization-low temperature solution process", the problems of poor flexibility of traditional thermoelectric materials, nanocomposite interface failure and unsustainable high-temperature process are solved.

This invention relates to the field of crystal material preparation technology, specifically to a ternary layered selenide Ge 0.85 Bi 2.15+x Se4 semiconductor material and its preparation method. The preparation method includes the following steps: according to the chemical formula Ge... 0.85 Bi 2.15+x The molar ratio of germanium powder, bismuth powder, and selenium powder in Se4 is weighed, where 0 ≤ x ≤ 0.06. The weighed raw materials are mixed evenly and placed in a quartz tube. The quartz tube is then sealed under vacuum. The vacuum-sealed quartz tube is placed in a heating furnace and heated from room temperature to 900-950℃, held at this temperature for 12-24 hours. After the holding period, the quartz tube is removed from the heating furnace and quenched. The quenched and cooled quartz tube is then placed back in the heating furnace and heated from room temperature to 540-560℃, held at this temperature for 3-5 days for annealing, thus obtaining the ternary layered selenide Ge. 0.85 Bi 2.15+x Se4 semiconductor material. This invention successfully solves the technical problem of obtaining a single phase in the GeBi2Se4 system by precisely controlling the Ge / Bi ratio and employing high-temperature quenching and low-temperature long-time annealing processes.

This invention discloses a method for oxidative leaching of selenium and mercury from copper smelting acid sludge, belonging to the field of solid waste comprehensive utilization technology. The leaching system in the oxidative leaching is a ternary synergistic oxidative leaching system of "sulfuric acid-sodium chloride-oxidant". Under the action of the synergistic leaching system, efficient and selective leaching of selenium and mercury from copper smelting acid sludge is achieved. This method avoids the corrosion of equipment by volatile acids and the problem of excessive oxidation of the nitric acid system, and significantly improves the stability of the oxidation process and the efficiency of reagent utilization, ultimately achieving multiple goals such as efficient recovery of valuable metals, low-carbon and energy-saving process flow, and compliant and harmless treatment of hazardous waste.

This application discloses an antimony-containing phosphorus-free sulfide solid electrolyte, its preparation method, and its applications. The antimony-containing phosphorus-free sulfide solid electrolyte of this application is based on Li6SbS5I electrolyte. It achieves this by synergistic substitution of Sb with tetravalent Sn and Si cations in a certain proportion, while simultaneously synergistic substitution of S with O, Se, and Te in a certain proportion with increasing ionic radii. This effectively maintains the crystal structure of the electrolyte, resulting in high ionic conductivity and excellent air stability.

The present application relates to the technical field of cold storage. Specifically disclosed are a cold storage material, and a preparation method therefor and the use thereof. The cold storage material comprises a Gd2O2Se crystal. The cold storage material in the present application comprises the Gd2O2Se crystal, and the Gd2O2Se crystal has a phase transformation near 6.22 K, a relatively large specific heat in a temperature range of 1-10 K, and an obvious magnetothermal effect and can be used as a cold storage material at a liquid helium temperature.

The application provides a method for capturing gold in lead anode slime by antimony reinforced bismuth, and belongs to the technical field of resource comprehensive utilization; on the basis of capturing gold and silver by lead bismuth, antimony is added to reinforce the effect of capturing gold by bismuth; through theoretical calculation, antimony atoms doped on the surface of bismuth can enhance the adsorption strength of gold atoms, and reinforce the effect of capturing gold by bismuth; therefore, the application develops a method for mixing lead anode slime, crude lead and crude antimony according to a certain proportion to obtain noble lead through reduction smelting, obtaining gold and silver alloy through oxidation and impurity removal of the noble lead, obtaining crude silver and crude gold through vacuum distillation of the gold and silver alloy, and obtaining high-purity silver and gold through electrolysis of the crude silver and the crude gold; compared with the method without adding crude antimony, the recovery rate of silver and gold is improved; by increasing the content of antimony in the noble lead, reducing the loss of gold in the reduction smelting process, and cooperatively smelting crude bismuth and crude antimony, the recovery rate of bismuth and antimony is improved, and efficient recovery and utilization of rare and precious metals in lead anode slime is realized.

This invention relates to a method for preparing and applying a copper selenide@platinum composite material. H₂SeO₃ and polyvinylpyrrolidone (PVP) are dissolved in deionized water, stirred, and then hydrazine hydrate solution is added. After stirring at room temperature, the precipitate is washed and dispersed in water to obtain a selenium nanosphere dispersion. The selenium nanosphere dispersion is mixed with PVP solution, K₂PtCl₄ solution, and anhydrous ethanol, and stirred at 50–70°C. After centrifugation and washing, the precipitate is dispersed in water to obtain a selenium@platinum nanoparticle dispersion. The selenium@platinum nanoparticle dispersion is mixed with PVP solution, copper salt solution, and ascorbic acid solution, stirred, and then H₂O₂ solution is added. After stirring and reacting, the precipitate is centrifuged and washed to obtain the copper selenide@platinum composite material. Copper selenide, as a photothermal material, has excellent photothermal conversion performance and can achieve photothermal therapy for tumors. The platinum nanoparticles grown on its surface have a radiosensitizing effect, which can further enhance the effect of radiotherapy. The copper selenide@platinum composite material prepared in this invention enables combined RT / PTT therapy for tumors.

The present invention relates to a non-stoichiometric Ni0 .85Se / NaCI composite nanomaterial obtained from a nickel selenide and sodium chloride, useful as a multifunctional electrocatalyst and / or photocatalyst for the evolution of hydrogen and oxygen from water, and / or for urea oxidation, and which can also act as a mediator in the oxygen evolution reaction, and the simultaneous purification of aqueous solutions contaminated by organic pollutants. The invention also relates to the method for obtaining said composite nanomaterial, together with the use thereof for obtaining a multifunctional electrode for the evolution of hydrogen and oxygen from water, and / or for urea oxidation. The invention also relates to a multifunctional electrode comprising the non- stoichiometric Ni0 . 85Se / NaCI composite nanomaterial of the invention.

This invention discloses a selenite crystal and its preparation method. X-ray powder diffraction of the selenite crystal, measured using Cu-Kα radiation, yielded diffraction angles (expressed as 2θ) of 17.7°±0.2°, 19.5°±0.2°, 20.0°±0.2°, 22.9°±0.2°, 24.5°±0.2°, 24.9°±0.2°, 26.2°±0.2°, 29.8°±0.2°, 30.2°±0.2°, 31.4°±0.2°, and 33°. Characteristic peaks are observed at 0°±0.2°, 34.3°±0.2°, 35.8°±0.2°, 36.6°±0.2°, 37.4°±0.2°, 37.5°±0.2°, and 38.4°±0.2°. A characteristic endothermic peak is observed at 73.4℃ in the differential scanning calorimetry (DSC) spectrum of the crystal. This invention features a simple preparation route, mild reaction conditions, convenient operation, low cost, and good process reproducibility. The prepared selenite has a stable crystal form, making it suitable for large-scale industrial production of pharmaceutical raw materials.

This application discloses a lead sulfide-based material and its preparation method, as well as a thermoelectric device, belonging to the field of lead sulfide-based material preparation. The preparation method includes the following steps: placing the raw material in a temperature field for heat treatment to obtain the lead sulfide-based material; the temperature field includes a first temperature zone, a second temperature zone, and a third temperature zone sequentially arranged along a first direction; the heat treatment sequentially includes a heating stage, a first isothermal stage, a first cooling stage, a second isothermal stage, a second cooling stage, a third isothermal stage, and a cooling stage. This application mainly reduces the thermal conductivity of the lead sulfide-based material by placing the raw material in a specific temperature field for gradient heat treatment, while significantly improving its various thermoelectric performance parameters, meeting the requirements for thermoelectric devices and showing broad application prospects.

This application discloses a method for preparing a MoSe2 / nitrogen-doped expanded graphite composite electromagnetic wave absorbing material. Melamine is used as the nitrogen source, and after mixing and grinding with expandable graphite, nitrogen-doped expanded graphite is obtained by high-temperature annealing. Sodium molybdate dihydrate and selenium powder are dissolved in hydrazine hydrate to obtain solution A. The nitrogen-doped expanded graphite is dispersed in a mixture of deionized water and ethanol to obtain mixture B. Solution A and mixture B are mixed and transferred to a high-pressure reactor for hydrothermal reaction. After filtration, washing, and drying, the composite material is obtained. In this material, MoSe2 is uniformly grown in flower-shaped nanosheets between the layers and on the surface of the three-dimensional porous worm-like nitrogen-doped expanded graphite. The preparation process of this application is simple and low-cost. The resulting composite material achieves a minimum reflection loss of -43.6 dB at a 5% filler content and an effective absorption bandwidth of 8.2 GHz, which can be applied in the fields of radar stealth, electromagnetic compatibility protection, and electromagnetic radiation absorption.

This invention proposes a MoTe2-MoN composite hard carbon material, its preparation method, and its applications, belonging to the technical field of sodium-ion battery electrode materials. This invention achieves in-situ simultaneous synthesis of MoTe2-MoN composite hard carbon material via low-temperature solution mixing, freeze-drying, and one-step controlled atmosphere calcination. This method is simple, low-cost, safe, and environmentally friendly. In the prepared composite material, MoTe2 nanoribbons and MoN nanosheets grow uniformly and interlaced on a carbon framework, constructing a tightly connected heterogeneous interface. The built-in electric field induced by this heterogeneous interface accelerates charge transport kinetics, improves the reaction rate, and enhances cycle stability, making it an ideal high-performance anode material for sodium-ion batteries.

This invention discloses a high-entropy V-VI-VII group hydrogen evolution electrocatalyst, its preparation method, and its application, belonging to the field of electrocatalysis and new energy materials technology. The active material of the hydrogen evolution electrocatalyst is BiSbTeSeI2 single crystal with a particle size of 0.5–10 μm. The preparation method includes: uniformly mixing bismuth, antimony, tellurium, selenium, and iodine sources, placing them in a quartz tube, sealing under vacuum, obtaining BiSbTeSeI2 single crystals through a chemical vapor phase transport reaction, and then obtaining the catalyst through mechanical grinding or liquid phase exfoliation. This catalyst is used for hydrogen production via water electrolysis at -10 mA cm⁻¹. ‑2 The hydrogen evolution overpotential is 188–255 mV at the specified current density, exhibiting excellent hydrogen evolution performance and cycle stability. Furthermore, the preparation method is simple and inexpensive, making it suitable for industrial production.

The application discloses a selenium molybdate matrix proton conductor material and a preparation method thereof, and is prepared according to the following steps: (1) preparation of melamine hexaacetic acid, iminodiacetic acid is reacted with cyanuric chloride to obtain melamine hexaacetic acid; (2) preparation method of imidazole modified polyacid, ammonium molybdate tetrahydrate and sodium selenite Na2SeO3 are weighed and added into 80 mL deionized water, and stirring is carried out at room temperature until the solid is completely dissolved, and constant temperature stirring reaction is continuously carried out; then, imidazole is added, stirring is carried out until the solution is saturated, melamine hexaacetic acid is further added, and continuous stirring is carried out until the system is uniform; the pH of the system is slowly adjusted to 3.8-4.0, and the product is obtained by continuously stirring at room temperature under a sealed condition. The prepared material meets the application requirement of electrochemical devices under a medium-low temperature and a wide humidity environment, and the proton conductivity of the material can reach 1.58*10 –1 S·cm –1 at 373 K and 97% relative humidity, which is much higher than most reported polyacid matrix proton conducting materials.

This invention belongs to the field of electrocatalytic materials technology, specifically relating to a fullerol-modified nanoarray electrode material, its preparation method, and its application. This invention obtains fullerol-modified copper hydroxide nanomaterials by modifying the surface of a copper hydroxide nano-precursor material with fullerol, and finally, through a high-temperature gas-solid conversion reaction, obtains fullerol-modified copper-based compound nanomaterials. On the one hand, fullerol modulates the electronic structure of the copper-based material, thereby increasing the catalytic activity of Cu. + The species remain stable during the cathode electroreduction process; on the other hand, the fullerol's rich-OH groups can effectively regulate the interfacial water structure, reconstruct the hydrogen bond network, and promote water dissociation to generate active hydrogen. Benefiting from these advantages, the material prepared in this invention not only exhibits excellent electrocatalytic activity and selectivity in the field of electrocatalytic nitrate reduction to ammonia, but also demonstrates good long-term operational stability, providing a high-performance, low-cost electrocatalytic material solution for green ammonia synthesis technology.

The application belongs to the field of lithium ion batteries, and particularly relates to a preparation method of a fast-ion-conductor modified lithium-rich manganese-based positive electrode material and application thereof. The preparation method comprises the following steps: firstly, obtaining a mixed precursor solution according to element ratio; then, obtaining a precursor powder of the material through high-temperature spray drying of the precursor solution; then, sintering the precursor powder at high temperature to obtain a lithium-rich manganese positive electrode powder material; then, mixing the lithium-rich manganese material with a fast-ion-conductor precursor through ball milling, and adjusting the ball milling process; finally, obtaining the fast-ion-conductor modified lithium-rich manganese positive electrode material under different sintering conditions. The application improves the cycle stability of the lithium-rich manganese-based positive electrode material by improving the kinetic performance and structural stability of the material. The two-phase structure composite improves the structural stability of the positive electrode material and forms ion channels, which can effectively improve the cycle stability of the battery, and greatly improve the long cycle performance, voltage and capacity attenuation of the lithium battery.

The application relates to the technical field of supercapacitor electrode materials, in particular to a sulfur-doped nickel cobalt selenide composite material and a preparation method and application thereof. The preparation method comprises the following steps: taking SeO2 as a selenium source, taking hydrazine hydrate as a strong reducing agent, mixing a SeO2 ethylene glycol solution with the hydrazine hydrate and a NiCo-PBA@NiCo-LDH multi-level core-shell precursor, and performing a selenization reaction to obtain NiCoSe2; mixing the NiCoSe2 with sulfur powder, and performing calcination treatment to obtain the sulfur-doped nickel cobalt selenide composite material. Through the synergistic effect of the multi-level core-shell structure and the hetero-doping, the sulfur-doped nickel cobalt selenide composite material is endowed with excellent electrochemical energy storage performance, and the problems of poor rate performance and decreased cycle stability caused by the insufficient intrinsic electrochemical activity and large volume change in the charging and discharging process of the transition metal selenide as a supercapacitor electrode material are effectively solved.

The application provides a preparation method and application of a series of tellurium niobate compounds and crystals thereof, and the chemical general formula of the crystals is A2Nb2Te4O 15 , wherein A is selected from Ca, Mg, Sr or Ba. The molecular formula of the series of tellurium niobate compounds is Mg2Nb2Te4O 15 , Ca2Nb2Te4O 15 , Sr2Nb2Te4O 15 , Ba2Nb2Te4O 15 , respectively. The crystals are crystallized in an orthorhombic system, and the space group is Pma 2. The application successfully synthesizes a series of novel compounds with non-centrosymmetric structures based on a functional unit complex method. Experimental measurement shows that the crystals have high powder frequency doubling effect, are superior to a commercial benchmark material KTP, have an ultraviolet absorption cutoff edge shorter than 300 nm, an infrared cutoff edge wider than 6 mm, and moderate birefringence, and are expected to realize wide-band and high-power laser output. In the preparation method, a flux method is used to obtain single crystals with excellent optical quality.

The application discloses a preparation method of MXene / MoSe2 electromagnetic wave absorbing material with a hierarchical structure and belongs to the technical field of electromagnetic wave absorbing. The application utilizes a simple solvothermal method to prepare MoSe2 microspheres with a ball-shaped flower shape, and then uniformly disperses the CTAB modified MoSe2 microspheres on single-layer MXene sheets through an electrostatic adsorption method, so that a MXene / MoSe2 composite material with a hierarchical structure is finally prepared, and the electromagnetic wave absorbing capacity of MoSe2 is significantly improved. The MXene / MoSe2 nanocomposite material provided by the application has excellent electromagnetic performance, good stability, adjustable wave absorbing frequency, realizes high-efficiency wave absorbing performance, and is low in production cost and green in production process.

This application relates to a positive electrode active material and its preparation method, and a battery, belonging to the field of battery technology; the positive electrode active material has a core-shell structure, the core of the core-shell structure includes a lithium-rich manganese-based active material, and the shell layer of the core-shell structure includes Li2SO4, Li2SeO4, and Li2Se. x S 1‑x At least two of the following O4, wherein 0 < x < 1, are obtained by coating Li2SO4, Li2SeO4 and Li2Se with a lithium-rich manganese-based active material. x S 1‑x At least two of the shells formed in O4, utilizing Li2SO4, Li2SeO4, and Li2Se x S 1‑x O4 and other materials have high ionic conductivity, which can effectively promote the transport of lithium ions at the interface of lithium-rich manganese-based active materials, giving the positive electrode active material a high ion diffusion coefficient.

This invention relates to a positive electrode material for a sodium-ion battery, a method for preparing the same, and its applications. The general chemical formula of the positive electrode material for the sodium-ion battery is Na a Ni b Fe c Mn d M e A f The material is O2, with elements M and A acting as doping elements, the MO bond energy of element M being greater than 500 kJ / mol, the ionic radius of element A being 0.06 nm or greater, and the valence of element A being ≥ +3. In the XRD spectrum of the positive electrode material of the sodium-ion battery, there are no heterophase diffraction peaks in the range of 42.5° to 43.5°. Element M dops into the interstitial atomic sites, acting as a constraint on oxygen and limiting the release of oxygen in the desodium state, while element A preferentially replaces transition metals at transition metal sites, providing support and improving the gas generation problem in the cycle process of the positive electrode material of the sodium-ion battery.

The application discloses a preparation method and application of a copper selenide polyoxometalate nanocluster, relates to the technical field of biological nanomaterials, and comprises the following steps: dissolving ammonium molybdate tetrahydrate in ultrapure water to obtain an ammonium molybdate solution, dissolving copper chloride dihydrate in ultrapure water to obtain a CuCl2 solution, mixing the ammonium molybdate solution and the CuCl2 solution to obtain a mixed solution, dropwise adding an ascorbic acid solution into the mixed solution obtained in the previous step, continuing to stir and react after the dropwise adding is completed, loading the obtained Cu-POM crude solution into a dialysis bag, performing freeze-drying treatment on the Cu-POM solution after dialysis is completed, obtaining a Cu-POM powder product, preparing a Cu-POM solution with a concentration of 0.8-1.2 mg / mL and mixing the solution with a solution at a volume ratio of 1:1, loading the obtained Cu-Se-POM crude solution into a dialysis bag after the reaction is completed, and performing freeze-drying treatment on the Cu-Se-POM solution after dialysis is completed, to obtain a Cu-Se-POM powder product. Compared with a preparation method of a traditional polyoxometalate doped material, the preparation efficiency is high, the raw material cost is low, and the preparation method is environment-friendly.