2326 results about "Vanadium atom" patented technology

Methods and systems for depositing vanadium and/or indium layers onto a surface of a substrate and structures and devices formed using the methods are disclosed. An exemplary method includes using a cyclical deposition process, depositing a vanadium and/or indium layer onto the surface of the substrate. The cyclical deposition process can include providing a vanadium and/or indium precursor to the reaction chamber and separately providing a reactant to the reaction chamber. The cyclical deposition process may desirably be a thermal cyclical deposition process. Exemplary structures can include field effect transistor structures, such as gate all around structures. The vanadium and/or indium layers can be used, for example, as barrier layers or liners, as work function layers, as dipole shifter layers, or the like.

Methods and systems for depositing vanadium nitride layers onto a surface of the substrate and structures and devices formed using the methods are disclosed. An exemplary method includes using a cyclical deposition process, depositing a vanadium nitride layer onto a surface of the substrate. The cyclical deposition process can include providing a vanadium halide precursor to the reaction chamber and separately providing a nitrogen reactant to the reaction chamber. The cyclical deposition process may desirably be a thermal cyclical deposition process.

The invention discloses a method for extracting vanadium from vanadium slag clinker leached by ammonium carbonate. The method comprises the following steps of: calcifying and roasting vanadium slag of which the molar ratio of CaO to V2O5 is (2-3):1 at the temperature of between 700 and 900 DEG C, grinding the vanadium slag clinker, sieving, and leaching by an ammonium carbonate solution at the leaching temperature of between 60 and 98 DEG C for 30 to 120 minutes, filtering to obtain vanadium-containing leachate, performing vanadium deposition on the vanadium-containing leachate to obtain a vanadium finished product, wherein when the ammonium carbonate solution is leached, the concentration of the ammonium carbonate solution is between 200 and 800 g/L, and a liquid/solid ratio of the ammonium carbonate solution to the vanadium slag clinker is (5-30):1. According to the method, a leaching process is easy to operate and low in cost, and has low requirement on the equipment; and a leaching agent is low in cost and can be recycled, so that the production cost is reduced. By the method, the leaching rate of the vanadium is high, namely is over 90 percent, impurity elements and particularly a phosphorus element in the leachate are reduced, and the leaching rate of phosphorus is less than 10 percent.

A microbolometer includes a micro-bridge structure for uncooling infrared or terahertz detectors. The thermistor and light absorbing materials of the micro-bridge structure are the vanadium oxide-carbon nanotube composite film formed by one-dimensional carbon nanotubes and two-dimensional vanadium oxide film. The micro-bridge is a three-layer sandwich structure consisting of a layer of amorphous silicon nitride base film as the supporting and insulating layer of the micro-bridge, a layer or multi-layer of vanadium oxide-carbon nanotube composite film in the middle of the micro-bridge as the heat sensitive and light absorbing layer of the microbolometer, and a layer of amorphous silicon nitride top film as the stress control layer and passivation of the heat sensitive film. The microbolometer and method for manufacturing the same can overcome the shortcomings of the prior art, improve the performance of the device, reduce the cost of raw materials and is suitable for large-scale industrial production.

A preparation method of a carbon coated vanadium sodium phosphate positive electrode material comprises the steps: with glucose as a reducing agent and a carbon source and water as a dispersant, carrying out ball milling of NH4VO3, NaH2PO4.2H2O and glucose in water, carrying out spray drying, calcining, and thus obtaining the carbon coated vanadium sodium phosphate positive electrode material. The method has the advantages of low synthesis temperature, simple steps, easily obtained raw materials, and advantageous industrialization; the obtained carbon coated vanadium sodium phosphate positive electrode material has a structure with uniform primary particles, has the particle size of 100-200 nm, and has the characteristics of short sodium ion diffusion distance, fast transmission speed, high specific surface area, high electrical conductivity and fast ion transmission and the like. The obtained carbon coated vanadium sodium phosphate positive electrode material is assembled into a battery; in a voltage scope of 2.0-3.75 V and under 1 C multiplying power, the highest first charge and discharge capacity per gram can reach 93.5 mAh*g<-1>, the capacity retention rate can be up to 97.7% after cycling for 50 circles with the 1C multiplying power, and excellent electrochemical performance is showed.

The invention relates to an intelligent phase-change material with adjustable phase-change temperature and its preparing process, which comprises making doped vanadium dioxide precursor through liquid phase precipitation method, carrying out filtering, scouring, drying, heating and crystallizing. The crystal grain dimension of the obtained phase-change material is less than 100 nanometers, thus can be applied into intelligent window coating material and temperature measurement resistors.

The invention discloses a method for extracting vanadium and chromium from converter vanadium chromium slag. The method comprises the following steps: 1) adding Na2CO3 into the vanadium chromium slag, mixing uniformly and carrying out oxidizing roast on the mixture, wherein the addition of Na2CO3 is controlled according to a molar ratio of V2O3/Na2CO3 in the vanadium chromium slag being 0.1-0.4; grinding the roasted clinker, and leaching with water to obtain a primary roasted leaching solution and residue; 2) drying and grinding the residue to serve as a raw material from which vanadium and chromium can be extracted in the second step, adding Na2CO3 in the residue, mixing uniformly and carrying out oxidizing roast on the mixture, wherein the addition of Na2CO3 is controlled according to a molar ratio of (V2O3+Cr2O3)/Na2CO3 in the residue being 0.1-0.4; grinding the roasted clinker, and leaching with water to obtain a secondary roasted leaching solution; and 3) separately separating and extracting the vanadium and chromium from the primary roasted leaching solution and the secondary roasted leaching solution. The method disclosed by the invention is simple in process and high in vanadium and chromium immersion ratio and brings convenience for separating vanadium from chromium subsequently.

This invention relates to an electrolyte of a full-vanadium ionic fluid-flow battery composed of V salt sulfate, H2So4, water, alcohol and additives, which are Na2SO4, Na pyrophosphate, salufer and hydrogen peroxide. This invention also provides a preparation method: pumping qualified V liquid from a V-plant into a reaction tank, regulating the PH value of the solution and inletting liquid SO2 into it to be recovered, then the PH value of the solution is regulated with Na2SO4 to deposit VO2 to be dissolved in the solution containing H2SO4, water and alcohol to be added with the additives to be electrolyzed in the tank to get the V electrolyte with 50% of 3valence and 4 valence V separately and density of 1.0mol/L~4.2mol/L .

The invention discloses a ferro-nickel oxyhydroxide-modified bismuth vanadate photoelectrode and a preparation method and application thereof. The preparation method comprises the following steps: firstly, depositing bismuth oxyiodide on the surface of conductive glass, then coating the surface with the deposited bismuth oxyiodide with a dimethyl sulfoxide solution of vanadyl acetylacetonate, annealing, performing alkali soaking and rinsing with water to remove excessive vanadium pentoxide, and then drying to obtain a bismuth vanadate photoelectrode, and modifying ferro-nickel oxyhydroxide on the surface of the bismuth vanadate photoelectrode by adopting a cyclic voltammetry method in a three-electrode system, thus obtaining the ferro-nickel oxyhydroxide-modified bismuth vanadate photoelectrode. The invention further discloses applications of the ferro-nickel oxyhydroxide-modified bismuth vanadate photoelectrode in photoelectrocatalytic decomposition water. The prepared photoelectrode is used for producing hydrogen from photoelectrocatalytic decomposition water, can inhibit the compounding of photon-generated carriers, the service life of carriers generated by a BiVO4 photoelectrode can be effectively prolonged, and the oxygen evolution reaction on the surface of the photoelectrode can be promoted, so that the solar optic hydrogen conversion efficiency of a semiconductor photoelectrode can be improved.

The invention relates to a combined chemical-electrochemical method for preparing an all-vanadium redox flow battery electrolyte. The method adopts a solid or solution containing soluble vanadate, especially vanadium slag leachate obtained after steel-making with vanadic titano-magnetite, for production of a high-purity high-concentration vanadium electrolyte. The method is characterized in that a vanadyl sulfate electrolyte with a sulfuric acid concentration of 1 to 6 mol/L and a vanadium concentration of 1 to 5 mol/L can be prepared through impurity removal, acidic vanadium precipitation, multiple alkaline leaching and vanadium precipitation, calcination and reduction, an electrochemical process is cooperatively used so as to prepare a 3.5-valent or 3-valent vanadium electrolyte, and after electrolysis, the vanadium electrolyte of a positive electrode can be repeatedly used through chemical reduction. The method provided by the invention can treat the vanadium slag leachate and the solid or solution containing soluble vanadate and has the advantages of simple process flow, mild reaction conditions, substantially reduced cost, etc.; and the prepared high-purity high-concentration vanadium electrolyte is especially applicable to an all-vanadium redox flow battery.

The invention provides a vanadium selenide/carbon-based composite material, a preparation method of the material, and a negative electrode of a lithium ion battery. Vanadium selenide in the vanadium selenide/carbon-based composite material is of a hexagonal crystal system and is deposited on the surface of a carbon-based material, or the surfaces of vanadium selenide particles are at least partially coated with the carbon-based material to form vanadium selenide/carbon particles of a core shell-like structure; the vanadium selenide/carbon particles are connected through carbon nets to obtain the high conductivity. In the negative electrode of the power lithium ion battery, prepared from the vanadium selenide/carbon-based composite material provided by the invention, since selenide with the relatively large specific capacity is combined with the carbon-based material, the negative electrode has the characteristics of large capacity, high rate and high cyclic stability. Therefore, the negative electrode made of the composite material has the relatively large capacity, relatively long service life and relatively low price when applied to the lithium ion battery.

The invention discloses a preparation method of a nano-structure WC-Co composite powder, and belongs to the field of an alloy preparation method. The method comprises the following steps in sequence: adding a carbonic powder material which is excessive to tungsten, vanadium and chromium carbides into water-soluble saturated mixed aqueous solution of tungsten-containing compound, cobalt-containing compound, chromium-containing compound and vanadium-containing compound to adsorb the saturated composite salt solution; dehydrating and drying to form a nano-scale composite salt thin layer on the surface of the carbonic powder material; removing crystal water out of the composite salt at the temperature below 500 DEG C under a condition of isolating air, and decomposing the composite salt into composite oxide of tungsten oxide, chromium hemitrioxide, vanadium oxide and cobalt oxide, further heating, and reducing and carbonizing the composite oxide on the surface of the carbonic powder material to generate the WC-Co nano-structure composite powder at the temperature below 850 DEG C. The preparation is a simpler and more reliable novel preparation method of the nano WC-Co composite powder by a direct carbonization method.

The invention relates to a converter vanadium extraction process adopting a top blowing oxygen lance to blow cooling agents, belongs to the technical field of ferrous metallurgy, and is used for solving the problems that the temperature of a molten pool is difficult to control in the vanadium extraction course, the dynamic condition is poor and the like and increasing the oxidation conversion rate of vanadium and the quality of vanadium slag. The converter vanadium extraction process comprises a powder supply system and an oxygen supply system; and the cooling agents are blown through using a supersonic oxygen jet of the top blowing oxygen lance, and the aims of controlling the temperature of the molten pool in the vanadium extraction course and improving the stirring ability of the molten pool are achieved by utilizing a principle that powder rapidly reacts with hot iron to absorb heat, thereby achieving the technical effect of efficient vanadium extraction. The cooling agents enters the oxygen lance via a powder supply pipe in the powder blowing process; an outlet of the powder supply pipe can be positioned between the upper part of a lance body and an Raoult outlet of a blowing head; and the inner diameter of the powder supply pipeline is in the range of 15 to 180mm, the powder blowing flow rate is in the range of 20 to 800kg/min, the carrier gas flow rate is in the range of 100 to 4000Nm3/h, and the carrier gas pressure is in the range of 0.5 to 1.6Mpa. The converter vanadium extraction process is suitable for vanadium extraction converters of 200 to 300t; and by adopting the converter vanadium extraction process, the semi-steel vanadium content can be reduced to below 0.03 percent, and the quality of vanadium slag (V2O5) is increased by more than 1 percent, so that the recovery rate of vanadium resources is increased.

The invention belongs to the technical field of electrode materials and relates to sodium vanadium fluorophosphate as well as a low-temperature environment-friendly preparation method and use thereof. The preparation method comprises the steps of preparing a mixed water solution of a sodium source, a vanadium source, a phosphorus source and a fluorine source, reacting by virtue of the mixed water solution at 20-180 DEG C to obtain sodium vanadium fluorophosphate, wherein the vanadium source is a trivalent vanadium source and/or a tetravalent vanadium source; the chemical constitution of sodium vanadium fluorophosphate is Na3(VOxPO4)2F3-2x, and x is more than or equal to 0 and less than or equal to 1. According to the low-temperature environment-friendly preparation method, the mixed water solution of the sodium source, thephosphorus source, the fluorine source and the trivalent vanadium source and/or a tetravalent vanadium source can generate spontaneous reaction at 20-35 DEG C, the reaction can be accelerated at a temperature high than 35 DEG C and lower than 180 DEG C, and well-crystallized sodium vanadium fluorophosphate can be obtained. Sodium vanadium fluorophosphate can be used as an anode to be assembled into a battery, the specific discharge capacity is not lower than 100mAh/g, and the cycling stability is good.

The present invention provides a catalyst capable of producing an epoxy compound in high yield and improving the utilization efficiency of the oxidizing agent as well as a method of producing an epoxy compound using that catalyst. A catalyst for producing an epoxy compound by oxidizing a compound having at least one ethylenic double bond with an oxidizing agent, comprising a polyatom-containing heteropolyoxometalate anion (A1) having two defective and/or three defective structure sites and containing silicon as the heteroatom, and an element (E1) being at least one element selected from the group consisting of vanadium, tantalum, niobium, antimony, bismuth, chromium, molybdenum, selenium, tellurium, rhenium, cobalt, nickel, ruthenium, rhodium, palladium, osmium, platinum, iridium, silver, gold, zinc, aluminum, gallium, indium, scandium, yttrium, titanium, zirconium, hafnium, germanium, tin and lanthanoids, and being different from the polyatom.

The invention discloses an aqueous zinc ion battery vanadium-based positive electrode material which has the following chemical composition: MxV2O5.nH2O, M is Mg or Sn; 0 < x < = 2; 0 < n < = 2. The preparation method comprises the following steps: dissolving vanadium pentoxide in deionized water, dropwise adding an acidic solution after stirring, stirring in a water bath until the reaction is complete, dissolving M salt in deionized water, dropwise adding the solution after complete dissolution, and carrying out hydrothermal reaction after complete reaction. After the obtained positive electrode material is assembled into a button cell, an electrochemical performance test is carried out, and during the test, the current density range is 0.1-10A g <-1 >, and the voltage range is 0.1-1.8 V.The preparation method is simple and convenient, and has low requirements on experimental conditions. The microstructure of the synthetic material is a nanobelt, and the synthetic material has largerinterlayer spacing so that the layered structure is more stable, deintercalation and intercalation of zinc ions are further facilitated, and the assembled zinc ion battery shows excellent cycling stability and rate capability.