41 results about "Selenium metallicum" patented technology

The invention provides a metal selenide thermoelectric material for intermediate temperate and a preparation process thereof, which relates to the field of thermoelectric materials. The design point is as follows: the chemical formula of the thermoelectric material is InxAgySe3, wherein x + y=2, 0.05<= y <=0.25. The preparation process comprises the following steps: putting elemental In, Ag and Se into a vacuum quartz tube; synthesizing for 20-28 hours at the temperature of 1000-1100 DEG C; cooling the InxAgySe3 cast ingot in a furnace to 600-650 DEG C, and then, immediately quenching in water; crushing and ball-milling the quenched InxAgySe3 cast ingot; carrying out spark plasma sintering to prepare a block, wherein the sintering temperature is 550-650 DEG C, the sintering pressure is 40-60MPa, and the holding time is 8-12 minutes; coating a sodium silicate concentrated solution on the surface of the sintered block material; drying; and then, annealing for 20-28 hours in the vacuum quartz tube, wherein the annealing temperature is 180-200 DEG C. The material provided by the invention is prepared by using a conventional powder metallurgy method, thus the process is simple; the transition metal element Ag is used for replacing the In element in the In2Se3 thermoelectric alloy in an equimolar mode, thus the cost is lower; and the material has environment-friendly characteristics and does not have noise, thus the material is suitable for being used as an environment-friendly energy material.

The invention discloses a normal-temperature and normal-pressure preparation method and application of a metal selenide mercury adsorbent. The metal selenide mercury adsorbent is prepared at normal temperature and normal pressure by adopting a precipitation method. The metal selenide mercury adsorbent comprises a compound formed by selenium and one or more of chromium, manganese, iron, copper, cobalt, nickel, zinc, molybdenum, silver and cadmium and a composite of the compound, unstable mercury is converted into stable mercury selenide, mercury in industrial tail gas or by-products of fire coal, metallurgy, waste incineration, cement production and the like is removed, mercury enriched in mercury-containing articles for daily use is absorbed, the recovery and reutilization of mercury resources are realized, and mercury to be treated can exist in the forms of a simple substance state, a free state and/or a compound state and the like. As the metal selenide has extremely high mercury adsorption capacity and adsorption rate, realization of large-scale preparation of the metal selenide under normal temperature and pressure conditions has great significance on mercury pollution prevention and control, and the corresponding technology has wide market application prospects.

The invention relates to the technical field of sodium ion batteries, and especially discloses a preparation method of a nano cubic bimetal selenide material. The method comprises the following stepsof: 1) weighing two different metal precursors, respectively dissolving the two different metal precursors in deionized water, performing uniform mixing and stirring to obtain turbid liquid, performing centrifuging, washing with water, and washing with alcohol to obtain a nano cubic layered doubled hydroxide; and 2) weighing a selenium source and the nano cubic layered doubled hydroxide, and performing selenizing to obtain the nano cubic bimetal selenide material. To improve the specific capacity of a battery and prolong the cycle life of the battery when transition metal is used as a sodium-ion battery anode material, according to the preparation method, a certain amount of transition metal precursor is weighed, and a cubic bimetal hydroxide precursor is prepared by adopting a solution method, the nano cubic bimetal selenide material can be used for preparing a sodium ion battery product, and the structural stability of the battery in the charging and discharging process can be effectively improved, so that the cycling stability of the battery is improved.

The invention provides a method for preparing an aluminum battery positive electrode material by using MOF induced metal selenide. The method comprises the following steps: (a) dissolving metal nitrate into a solvent to obtain a solution A, dissolving imidazole organic matters into a solvent to obtain a solution B, and then, uniformly mixing the solution A and the solution B, and carrying out standing, centrifuging, washing and drying to obtain a precursor; (b) uniformly mixing the precursor and a selenium source, and then, carrying out calcining to obtain a metal selenide active material; and(c) taking the metal selenide active material as a positive electrode, and assembling the metal selenide active material into the aluminum secondary battery. The multiple nano cage-shaped structuresare good in stability, so that dissolution of metal elementary substances, selenium and selenide is avoided; and intercalation and deintercalation of aluminum ions and polyaluminum anions are increased, so that excellent energy density is shown in the aluminum battery positive electrode material, and a foundation is laid for commercialization of aluminum batteries.

The invention belongs to the field of inorganic materials, and particularly relates to a preparation method of hexagonal-prism-shaped iron-cobalt double-metal selenide. The preparation method comprises the following steps: S1, mixing and dissolving iron salt and cobalt salt in isopropanol; S2, preparing a PVP isopropanol solution; S3, preparing a NaHCO3 aqueous solution; S4, mixing the solutions obtained in the step S1 and the step S2 according to a volume ratio of 1:(1-3), and carrying out ultrasonic treatment for 10-20 minutes; S5, adding the mixed solution obtained in the step S4 into the NaHCO3 aqueous solution to obtain an iron-cobalt metal precursor; and S6, mixing the iron-cobalt metal precursor obtained in the step S5 with selenium powders according to a mass ratio of 1: (1-3), andcarrying out calcining for 3-5 hours. The iron-cobalt bimetal selenium composite carbon material prepared by the preparation method provided by the invention has relatively stable cycle life and ratecapability; and the conductivity of the material can be enhanced by doping carbon, so that the specific capacity of a battery is improved.

The invention belongs to the technical field of material science, and provides a nitrogen-selenium co-doped porous carbon sphere, a sodium ion battery negative electrode material, a preparation methodand applications thereof. The method comprises the steps of dissolving F127 and dopamine hydrochloride in a mixed solution of water and ethanol to obtain a structure adopting a block copolymer F127 as a template, removing impurities through ethanol centrifugation washing to obtain the porous structure taking dopamine as a skeleton; calcining the precipitate, and carbonizing to obtain the nitrogen-doped porous carbon sphere; respectively placing the nitrogen-doped porous carbon sphere and selenium powder at the two ends of a porcelain boat, and calcining to obtain the nitrogen-selenium co-doped porous carbon sphere; and preparing the porous material into the battery negative electrode material, and applying the battery negative electrode material to a sodium ion battery to obtain the sodium ion battery. According to the present invention, selenium is deposited on a three-dimensional framework constructed by the porous carbon sphere, so that sodium ions have better cycle performance andrate capability under the porous framework, and metal selenium serving as a real commercial stable negative electrode material is pushed forwards by one step.

The invention relates to the technical field of preparation of new energy electrode materials, in particular to a transition metal selenide-carbon composite material, a preparation method and application thereof. The preparation method comprises the following steps: 1, dissolving a cobalt source and a carbon source in a mixed solution of deionized water, methyl alcohol and ethylene glycol, uniformly stirring, carrying out centrifugation, separating, drying, and calcining the dried product at a high temperature to obtain a cobalt selenide precursor Co-MOF of an organic metal frame structure containing metal cobalt; and 2) placing the cobalt selenide precursor Co-MOF and selenium powder in a corundum ark, carrying out high-temperature calcination in argon flow for a period of time, and washing and drying the calcined product to obtain a target product. According to the invention, Co-MOF is synthesized, then the temperature is raised in a test tube furnace to synthesize the Co/C composite material, and finally selenium powder is introduced to obtain the CoSe2/C composite material which has a relatively large specific surface area; and the conductivity of the modified material is improved, the structure of the material is optimized, and the comprehensive electrochemical performance of the material is improved.

The invention belongs to the technical field of synthesis for environment-friendly nanometre materials, relates to a method for synthesising inorganic and organic hybrid materials, and particularly relates to a method for synthesising In2Se3 (en) hollow nanospheres by means of hydrothermal method. The method for synthesising In2Se3 (en) hollow nanospheres by means of hydrothermal method comprises the following steps of: reacting in a reaction kettle by means of hydrothermal method by taking indium chloride and selenium powder as reactants and the mixed solution of ethanediamine (en), deionized water and hydrazine hydrate as a solvent, cooling to a room temperature and then washing by virtue of absolute ethyl alcohol, separating and then vacuum-drying, and then obtaining the In2Se3 (en) hollow nanospheres. Inference from the growth mechanism shows that the method is suitable for synthesising the inorganic and organic hybrid materials of other metal selenides. The In2Se3 (en) hollow nanospheres prepared by the method are good in dispersity, without an agglomeration phenomenon, uniform in size, 150+/-5 nm in diameter, rough in surfaces, and formed by randomly accumulating small particles having a single-crystal structure and a lattice distance of 0.279 nm. The preparation method disclosed by the invention has the advantages of being green and environment-friendly, low in cost, simple in operation, strong in controllability, and good in the crystallinity of the obtained products.

The invention discloses a bimetallic selenide negative electrode material and a preparation method and application thereof. The preparation method comprises the steps: adding metal salt and a surfactant into a mixed solution of methyl alcohol and deionized water, and carrying out stirring to obtain a wine red solution; carrying out heating treatment on the prepared wine red solution, then carrying out natural cooling, and then carrying out centrifugation, washing and vacuum drying treatment to obtain a precursor; and under the inert atmosphere, mixing the precursor and selenium powder, carrying out low-temperature annealing treatment, and obtaining the bimetallic selenide. The material has higher specific discharge capacity and good rate and cycle stability, and shows great potential as a sodium ion battery negative electrode material.

The invention relates to the technical field of electro-catalysis hydrogen evolution, in particular to a transition metal compound hydrogen evolution film which comprises a substrate layer and a hydrogen evolution catalyst layer arranged on the surface of the substrate layer. The hydrogen evolution catalyst layer is a thin film formed by one of a transition metal sulfur compound, a transition metal selenium compound and a transition metal tellurium compound, and ionized Ar plasma generated by radio frequency backwash randomly irradiates a sample to generate an etching effect, so that random etching in a whole hydrogen evolution thin film plane is formed; the catalytic activity of the hydrogen evolution film is obviously improved.

The invention belongs to the technical field of lithium metal battery materials, and particularly relates to a metal selenium sulfide nanocrystalline-porous carbon sphere material. The material comprises a porous carbon sphere with a filling chamber, and metal selenium sulfide nanocrystalline loaded on the carbon wall of the porous carbon sphere and in the filling chamber; the chemical formula ofthe metal selenium sulfide nanocrystal is at least one of M'(SexS(1-x)) and M''2(SeyS(1-y))3, M' is zinc and/or magnesium; M'' is aluminum and/or indium, 0<x<1, and 0<y<1. The invention also comprisespreparation of the material, and a composite current collector, a negative electrode and a lithium metal battery which are prepared from the material. According to the invention, the metal selenium sulfide nanocrystalline is innovatively utilized to induce selective deposition of lithium metal, so that the first-circle efficiency and the cycling stability of the lithium metal battery can be improved.

The invention provides a formula and a processing technology for spot color ink. According to the invention, sludge, hydroxylamine powder and selenium powder are added into the spot color ink formulaaccording to a mass ratio of 2: 1: 1. The design in the invention is reasonable; the sludge, the hydroxylamine powder and the selenium powder are added into the formula for the spot color ink; and a metal-selenium complex can be produced when selenium reacts with heavy metal, hydroxylamine has high reducibility, is coordinated with charged metal ions in the metal-selenium complex, is dissolved inthe sludge and forms a large precipitate insoluble in water, so the purpose of removing heavy metal in the ink can be effectively achieved.

The invention discloses a sodium ion battery metal selenide negative electrode material and a preparation method and application thereof.The preparation method comprises the steps that metal selenide, a dispersing agent, metal salt and imidazole organic matter are mixed in a methanol solution, and a uniform metal organic framework coating layer is generated on the surface of the metal selenide in situ; and carrying out heat treatment on the obtained precursor in a protective atmosphere to obtain the electrode material. According to the method disclosed by the invention, an additional selenium source does not need to be introduced, and the composite material with two different types of metal selenide can be obtained through one-step heat treatment. According to the composite material, a large number of selenium vacancies are induced to be generated by virtue of moderate lattice mismatch between two different metal selenide. The introduction of selenium vacancy can solve the inherent low electron conductivity problem of bulk metal selenide, improve ion/electron transport kinetics, and improve the electrochemical performance of the material. The preparation method provided by the invention is simple to operate, can be expanded and applied to preparation of various negative electrode materials, and has a wide application prospect.

The invention discloses a method for recovering tellurium and selenium from copper anode slime smelting flue gas. The method comprises the following steps: alkaline leaching of tellurium, complexing leaching of selenium by sulfur dioxide, step-by-step neutralization and recovery of tellurium, and selenium reduction. According to the method, the product quality of the crude selenium can be effectively improved; meanwhile, selenium and tellurium are comprehensively recovered, so that selenium and tellurium in the Venturi mud enter washing liquor, the content of selenium and tellurium in the Venturi mud is reduced, the circulation amount of metal selenium and tellurium returned to a Kaldo furnace is reduced, the direct recovery rate of selenium is increased, the influence of tellurium on subsequent selenium reduction is reduced, and the problems of metal circulation enrichment, large system pressure, high energy consumption and metal loss are solved; and the treating process is simple and feasible, the cost is low, and stable operation of the selenium recovery system can be realized.

The invention discloses an iron-copper-tin ternary selenide nano material for a sodium ion battery, which takes FeSe2 as a matrix and has a FeSe2 type phase structure. Two transition metal elements of Cu and Sn are uniformly dispersed in FeSe2; the microcosmic shape is a nano-polyhedron stacked shape, and fine nano-particles are attached to the surfaces of part of nano-polyhedrons. The invention also discloses a preparation method of the nano material, which comprises the following steps: taking dichloride as a transition metal source, taking water as a solvent, adding citric acid, and continuously stirring to homogenize a precursor solution; adding a selenium source sodium selenite and selenium powder, dropwise adding hydrazine hydrate, and then carrying out hydrothermal reaction to obtain the nano material. According to the invention, multi-component compounding of the selenide is realized, and the multi-component metal selenide with uniformly distributed transition metal elements is formed. The iron-copper-tin ternary selenide nano material is used as an electrode material to assemble a sodium ion battery, and the sodium ion battery has the advantages of ultra-long cycle life, ultra-fast charge characteristic and ultra-wide temperature range working characteristic.

The invention provides a graphene-based selenium composite material. The composite material comprises a metal selenide/graphene composite material and selenium compounded on the metal selenide/graphene composite material. Through the chemical adsorption effect of the polar two-dimensional metal selenide on the polyselenide, the discharge intermediate product polyselenide is effectively fixed in the conductive area of the positive electrode, the shuttle effect is inhibited, and the utilization rate of active substances is improved. The two-dimensional metal selenide with a catalytic regulation factor is introduced into the selenium positive electrode material, so that the selenium positive electrode material with chemical adsorption and catalytic action is obtained, and an electrocatalytic effect can be provided to regulate the oxidation-reduction reaction of polyselenide; the shuttle effect of the polyselenide between the selenium positive electrode and the lithium negative electrode in the charging and discharging process of the lithium-selenium battery is further inhibited, the shuttle effect of the polyselenide is obviously inhibited through the synergistic effect of the selenium positive electrode and the lithium negative electrode, and the cycle performance of the battery is improved. The preparation process provided by the invention is simple and easy for large-scale production, popularization and application.

The invention discloses preparation and application of a lithium ion battery electrode material. The preparation method of electrode material niobium diselenide for the lithium ion battery comprises the following steps: uniformly mixing a selenium source and a niobium source; and sintering under a non-oxidizing atmosphere or a vacuum condition to obtain niobium diselenide. Wherein the selenium source comprises metal selenium, the niobium source comprises metal niobium, and the molar ratio of the niobium source to the selenium source is 1: 2-3. The invention explores the synthesis conditions ofthe NbSe2 electrode material which is more excellent, simple, diverse and economical, does not need to waste the non-oxidizing atmosphere and has the lithium storage performance. The crystal structure of the synthesized NbSe2 is a layered structure of a hexagonal crystal system, belongs to a P63/mmc space group, and shows excellent cycle performance and rate capability when being applied to a lithium ion battery.

Methods are provided for fabricating a solution-processed metal and mixed-metal selenide semiconductor using a selenium (Se) film layer. One aspect provides a conductive substrate and deposits a first Se film layer over the conductive substrate. A first solution, including a first material set of metal salts, metal complexes, or combinations thereof, is dissolved in a solvent and deposited on the first Se film layer. A first intermediate film comprising metal precursors is formed from corresponding members of the first material set. In one aspect, a plurality of intermediate films is formed using metal precursors from the first material set or a different material set. In another aspect, a second Se film layer is formed overlying the intermediate film(s). Thermal annealing is performed in an environment including hydrogen (H₂), hydrogen selenide (H₂Se), or Se/H₂. The metal precursors are transformed in the intermediate film(s), and a metal selenide-containing semiconductor is formed.

The invention relates to a double-layer carbon coating-metal selenide composite electrode material and a preparation method thereof. Selenium powder and phthalocyanine salt are adopted as preparationraw materials, and the addition weight ratio of the selenium powder to the phthalocyanine salt is controlled, so that the prepared composite electrode material has relatively high cycling stability and rate capability. In the preparation process, the raw materials are firstly ground and mixed, two-stage stepped heating heat treatment is then carried out in a tubular furnace, meanwhile, with chemical vapor deposition of an organic solvent, the prepared metal selenide composite electrode material forms the double-layer double-function carbon coating-metal selenide, and the prepared composite electrode material has good comprehensive performance by controlling the reaction temperature, the organic solvent loading rate and other process parameters in the whole reaction process. The preparationmethod is simple in technological process, short in period, easy to control and convenient for industrial popularization and production.