62results about "Chromium compounds" patented technology

The invention discloses a chromium-site high-entropy chromium lithium titanate material as well as a preparation method and application thereof, and belongs to the technical field of electrochemical energy storage materials. The crystal structure of the chromium-site high-entropy chromium lithium titanate material is a single spinel solid solution phase, and the chemical general formula of the chromium-site high-entropy chromium lithium titanate material is Li (Cr < 1-x-y-z-w > V < x > Fe < y > Mn < z > Al < w >) TiO4. According to the preparation method, chromium trioxide serves as an oxidizing agent, carbohydrate serves as a reducing agent, and rapid synthesis is achieved through a one-step combustion method. The process is simple and efficient, and the prepared chromium-site high-entropy chromium lithium titanate material has relatively high specific capacity and excellent cycling stability and can be applied as a lithium ion battery negative electrode material. According to the invention, the problems of limited theoretical capacity and poor rate capability of the existing chromium lithium titanate material are effectively solved, and a new way is provided for developing a high-performance lithium ion battery negative electrode material.

An object is to provide a copper-chromium oxide spinel having excellent dispersibility in a resin composition and excellent adhesion to plating, and a resin composition and a resin molded article containing the copper-chromium oxide spinel. Specifically, provided is a copper-chromium oxide spinel with a particle size distribution spread SPAN = (D90 - D10) / D50 of 2 or less where, in volume-converted particle size distribution obtained by a laser diffraction and scattering method, particle sizes with a cumulative frequency from a smaller particle size side of 10%, 50%, and 90% are D10, D50, and D90, respectively.

A method for the resource utilization of chromium-containing sludge involves conditioning, decomposition, and roasting of the sludge. During roasting, a non-oxidizing atmosphere is introduced for protection, ensuring that chromium (Cr) is enriched in the residue in a non-toxic, non-volatile, low-valence state, thus producing high-value-added calcium-chromium sand. Simultaneously, sulfur-containing flue gas is collected during roasting to produce sulfuric acid or sodium sulfite, preventing sulfur diffusion and air pollution. This significantly reduces hazardous solid waste emissions from related production processes and lowers hazardous waste disposal costs. This method achieves both the harmless treatment of chromium-containing sludge and the comprehensive resource utilization of chromium, calcium, and sulfur within the sludge.

A method of fabricating plasmonic gold prism arrays for digital surface enhanced Raman spectroscopy, a plasmonic gold prism array arranged on a substrate for digital surface enhanced Raman spectroscopy, and a method of using a plasmonic gold prism array that is arranged on a substrate for digital surface enhanced Raman spectroscopy are disclosed. The method of fabricating plasmonic gold prism arrays for digital surface enhanced Raman spectroscopy includes depositing more than one layers of chromium and gold onto a plasmonic substrate comprising a monolayer of polystyrene beads and removing the monolayer of polystyrene beads under sonication in ethanol.

The invention relates to active electrode materials and to methods for the manufacture of active electrode materials. Such materials are of interest as active electrode materials in lithium-ion or sodium-ion batteries. The invention provides an active electrode material expressed by the general formula [M][Nb]y[O]z; wherein the active electrode material is oxygen deficient; wherein M consists of one of Mg, Cr, W, Mo, Cu, Ga, Ge, Ca, K, Ni, Co, Al, Sn, Mn, Ce, Sb, Y, La, Hf, Ta, Zn, In, or Cd; y satisfies 0.5≤y≤49; and z satisfies 4≤z≤124.

The application relates to the technical field of battery materials, and discloses a lithium secondary battery positive electrode coating material as well as a preparation method and application thereof. 3+z Nb 1‑ x M x O 4‑y R y wherein M is selected from one of Fe, Ti, Mn, Mo, W, V, Ta and Cr; R is selected from one of F, Cl, Br and I; 0<=x<1, 0<=y<=4, and the values of x, y and z satisfy the charge balance of the positive electrode coating material. The application integrates the triple functions of thermodynamic interface protection, fast ion conduction and charge compensation in a single material through cation, anion or anion-cation co-doping design based on Li3NbO4 as a matrix; the positive electrode coating material can significantly reduce the solid-solid interface impedance in a full solid-state battery, improve the first circle coulomb efficiency, and greatly improve the long cycle stability of an electrode; meanwhile, the positive electrode coating material can effectively inhibit the decomposition of high-voltage electrolyte in a traditional liquid battery, and improve the cycle life of a positive electrode material.

A cold storage material, which has a large specific heat and a small magnetization in an extremely low temperature region and has satisfactory manufacturability, is provided, and a method for manufacturing the same is provided. Further, a refrigerator having high efficiency and excellent cooling performance is provided by filling this refrigerator with the above-described cold storage material. Moreover, a device incorporating a superconducting coil capable of reducing influence of magnetic noise derived from a cold storage material is provided. The cold storage material of embodiments is a granular body composed of an intermetallic compound in which the ThCr2Si2-type structure (11) occupies 80% by volume or more, and has a crystallite size of 70 nm or less.

This provides a new material that exhibits negative thermal expansion. [Solution] The negative thermal expansion material is Ti (3) 2-x M x O3(M contains at least one element selected from Mg, Al, Si, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Ag, In, Sn, Sb, La, Ta, W, Bi, 0

The present application relates to modified lithium ion positive electrode material and its manufacturing method, and lithium ion battery. A modified lithium ion positive electrode material is provided, which comprises a positive electrode material body and a surface coating layer, wherein the chemical composition of the surface coating layer is high-entropy solid-state electrolyte Li7La3(M x M1 a M2 b M3 c …Mi j )2O 12 , wherein M is Zr or Ti, and x>0; M1, M2, M3…Mi are elements other than Li, La, Zr and Ti, i is a positive integer and 5≤i≤10, a, b, c…j are stoichiometric coefficients of each element, a, b, c…j≥0, and x+a+b+c+…+j=1. The present application further improves the ion conductivity at the interface by high-entropy of the solid-state electrolyte, and further reduces the problem of energy density reduction caused by surface coating by lithium enrichment.

The invention provides a wide-band-gap ferromagnetic insulator material. The chemical formula of the wide-band-gap ferromagnetic insulator material is Cd2CrSbO6. The invention also provides a method for preparing the wide-band-gap ferromagnetic insulator material, which comprises the following steps: (1) sufficiently grinding and mixing CdO, Cr2O3 and Sb2O5 in a protective gas atmosphere to obtain a mixture; (2) sealing and wrapping the mixture, and then carrying out heating and pressurizing treatment; and (3) cooling and depressurizing the treated product obtained in the step (2). The ferromagnetic insulator material Cd2CrSbO6 disclosed by the invention has a potential application value in spintronics devices.

This invention discloses a copper-chromium catalyst, its preparation method, and its application. The preparation method of the catalyst includes: (1) mixing polylactic acid with dichloromethane and ethanol to obtain a polymer solution, adding a soluble copper salt to it, stirring, and obtaining a spinning solution; (2) using a coaxial electrospinning nozzle to perform electrospinning with the obtained spinning solution, and collecting the obtained solid; (3) placing the obtained solid in an ethanol solution of trimesic acid to react, washing and drying after the reaction, and collecting the obtained solid; (4) dissolving a soluble chromium salt in ethanol and reacting it with the obtained solid, then washing and drying, and collecting the obtained catalyst precursor; (5) calcining the obtained catalyst precursor to obtain an unformed catalyst, then pressing it into tablets to obtain the copper-chromium catalyst. This catalyst can improve the conversion rate and selectivity of the catalyst in the hydrogenation of dimethyl maleate to prepare 1,4-butanediol and co-production of γ-butyrolactone and tetrahydrofuran.

Doped titanium niobate is provided, which has a chemical structure of Ti(1-x)M1xNb(2-y)M2yO(7-z)Qz or Ti(2-x′)M1x′Nb(10-y′)M2y′O(29-z′)Qz′, wherein M1 is Li, Mg, or a combination thereof; M2 is Fe, Mn, V, Ni, Cr, or a combination thereof; Q is F, Cl, Br, I, S, or a combination thereof; 0≤x≤0.15; 0≤y≤0.15; 0.01≤z≤2; 0≤x′≤0.3; 0≤y′≤0.9; and 0.01≤z′≤8.

The invention provides an oxygen-containing small-molecule intercalated hydrotalcite, a rubber composite material, and a preparation method and application of the oxygen-containing small-molecule intercalated hydrotalcite and rubber composite material. The oxygen-containing small molecule intercalated hydrotalcite is obtained by mixing and reacting components including ethanol salt, methoxide and a solvent; the ethanol salt comprises divalent ethanol salt and trivalent ethanol salt; the rubber composite material is prepared from the following components: rubber, oxygen-containing small molecule intercalated hydrotalcite and a vulcanizing agent. The oxygen-containing micromolecule intercalated hydrotalcite prepared by the method has larger interlayer spacing and better dispersity in a rubber matrix, interlayer water can be removed at the temperature of 100 DEG C or below, the influence in the vulcanization process is avoided, and the oxygen-containing micromolecule intercalated hydrotalcite is suitable for a high-temperature vulcanization environment, is used in a rubber composite material and can improve the gas barrier property of the composite material.

The invention relates to a niobium-based near-infrared fluorescent material, which belongs to the field of fluorescent materials and can be represented by a chemical formula (0 < x < = 0.1). The crystal structure of the niobium-based near-infrared fluorescent material is a monoclinic system, and the space group is P12 / m1. Under the excitation of blue light with the wavelength of 447 nm, the main peak of the emission spectrum of the niobium-based near-infrared fluorescent material is 850-860 nm, the full width at half maximum of the emission spectrum is 200-220 nm, and the internal quantum efficiency is 65%-90%, so that the niobium-based near-infrared fluorescent material can be applied to light supplement of night vision equipment.

The invention provides a preparation method of a heterogeneous transition metal chalcogenide material. The preparation method comprises a heating step, a plasma forming step and a deposition step. In the heating step, the chalcogenide solid is heated at a heating temperature to form a chalcogenide gas. In the plasma forming step, reaction gas is introduced to assist the chalcogenide gas in forming chalcogenide plasma. In the deposition step, a substrate is arranged adjacent to the chalcogenide plasma, the substrate comprises a base material and a plating layer, and the chalcogenide plasma and the plating layer are subjected to a deposition reaction at a reaction temperature and a reaction pressure to form the heterogeneous transition metal chalcogenide material with excellent optical characteristics and a surface-enhanced Raman scattering effect. Therefore, the heterogeneous transition metal chalcogenide material can be applied to a surface-enhanced Raman scattering sensor.

The invention belongs to the technical field of stabilization of high-arsenic waste acid, and particularly discloses a method for stabilizing high-arsenic waste acid by using calcium-free roasting chromium slag. Aiming at the problems of long treatment period, large capacity increasing ratio, high secondary pollution risk and the like in the prior art, the method comprises the following steps: drying a byproduct calcium-free roasting chromium slag generated by a chromium salt industrial sodium carbonate roasting process to constant weight; carrying out ball milling on the dried chromium slag subjected to calcium-free roasting; the calcium-free roasting chromium slag powder and the high-arsenic waste acid are uniformly mixed in a reaction kettle for a hydrothermal reaction, and the synergistic stabilization treatment of the calcium-free roasting chromium slag and the high-arsenic waste acid is realized. The strong oxidizing property of Cr (VI) in the chromium slag and the reducibility of As (III) in the waste acid are utilized, and Cr (VI) detoxification and As (III) oxidation are synchronously achieved through an oxidation-reduction reaction; newly generated Cr < 3 + > is combined with H2AsO4 <-> to form a stable mineral phase CrAsO4.

Provided are a negative electrode for a secondary battery, a slurry for a negative electrode, and a method for manufacturing a negative electrode, each of which has improved life characteristics. The negative electrode for a secondary battery contains at least a graphite-based material and a silicon-based material as negative electrode active materials, and a conductive material, the graphite-based material includes a granulated product of artificial graphite and natural graphite, at least a part of the natural graphite in the granulated product is partially flaked to form a flaked portion, and the flaked portion is in contact with the silicon-based material or other granulated product of artificial graphite and natural graphite, or is complexed with the silicon-based material.

The invention discloses a nano chromium oxyfluoride catalyst as well as a preparation method and application thereof, and the catalyst is prepared by taking a chromium source as a precursor, taking small molecular organic acid, a cationic surfactant and a nonionic surfactant as templates, adding a fluorine source and adopting a template agent guiding-solid phase thermal decomposition method. The preparation method comprises the following steps: grinding and mixing a chromium source precursor, a fluorine source and a template agent, reacting the mixture at 100-200 DEG C for 6-48 hours, centrifugally washing the reactant, drying, and sufficiently roasting the dried product in a muffle furnace to obtain the nano chromium oxyfluoride catalyst. The prepared nano chromium oxyfluoride catalyst has extremely high selectivity and stability when applied to a reaction for preparing fluorine-containing olefins (HFOs) through gas-phase HF removal of hydrofluoroalkanes (HFCs), the catalytic selectivity reaches up to 100% (the selectivity of a cis-product Z-HFO-1225ye reaches up to 98%), the catalytic conversion rate reaches 85% or above, and the nano chromium oxyfluoride catalyst has the advantages of being high in conversion rate, high in selectivity, good in stability and suitable for industrial production. The cost is low, and the operation is simple.

The invention discloses an XNbBr4O type compound as well as a design and performance prediction method and application thereof, and belongs to the technical field of transition metal doped niobium oxybromide. Wherein X in the XNbBr4O type compound is vanadium, chromium or cobalt, and the compound has magnetic sequence or ferroelectric distortion regulated and controlled by X element doping. The XNbBr4O type compound disclosed by the invention provides a theoretical basis for designing a novel multiferroic photoelectric device, provides an effective way for rapidly screening a high-performance photoelectric material, and has important scientific significance and application value for guiding subsequent experimental synthesis and device design.

This invention discloses a core-shell structured rare-earth oxide / gallium oxide composite particle for magnetoresistive thin film preparation and its preparation method. The composite particle comprises a core and a shell, wherein the core is composed of La. 1‑x Ca x The rare-earth oxide precursor powder of TmO3 has a gallium oxide shell. The preparation method includes: first, preparing a homogeneous suspension of the rare-earth oxide precursor powder and liquid gallium metal; then, spreading the precursor powder in the suspension, followed by stirring, multi-stage ultrasonic dispersion, and separation using an inert ceramic scraper to obtain core-shell structured precursor particles coated with liquid gallium metal; finally, sintering to transform the liquid gallium metal into a gallium oxide shell. When used as a thermal resistance evaporation source, the composite particles of this invention effectively solve the problems of compositional shift and evaporation source explosion and splashing caused by vapor pressure differences in multi-component materials. They offer advantages such as flexible component design, good thermal stability, and low preparation cost, making them suitable for preparing magnetoresistive effect composite thin films.

The application provides a Li3Al 1‑x M x The application provides a high-nickel layered oxide positive electrode material coated with a F6 layer and a preparation method, wherein the high-nickel layered oxide is LiNi x1 Co y1 Mn 1‑x1‑y1 O2, M is one or more of Mg, Fe, Cr, La, Ce and Y, 0 < x ≤ 0.1, and the coating layer has high conductivity; in the preparation, the high-nickel layered oxide powder is added into a mixed aqueous solution of metal salt, lithium salt, ammonium fluoride and aluminum salt, the molar ratio of the lithium salt, the ammonium fluoride and the aluminum salt is 3:6:(0.9-1), the metal salt is one or more of magnesium salt, iron salt, chromium salt, lanthanum salt, cerium salt and yttrium salt, the mixed system is stirred, and then centrifuged and dried in sequence to obtain a precursor; the precursor is subjected to high-temperature calcination treatment at 300-800 DEG C under a protective atmosphere, and the electrochemical performance of the high-nickel layered oxide of the high-nickel ternary lithium ion battery positive electrode material under high pressure can be improved.

The invention relates to active electrode materials and to methods for the manufacture of active electrode materials. Such materials are of interest as active electrode materials in lithium-ion or sodium-ion batteries. The invention provides a method of making an active electrode material, the method comprising: providing a mixed niobium oxide; combining the mixed niobium oxide with a carbon precursor to form an intermediate material, wherein the carbon precursor comprises polyaromatic sp2 carbon and is selected from pitch carbons, graphene oxide, and mixtures thereof; and heating the intermediate material under reducing conditions to pyrolyse the carbon precursor forming a carbon coating on the mixed niobium oxide and introducing oxygen vacancies into the mixed niobium oxide, thereby forming the active electrode material.

The invention relates to metal nanoparticles which comprise a metal and a capping agent coordinated to the metal, wherein the capping agent is a salt of a cationic compound capable of absorbing visible light. It also relates to semiconductor metal oxide nanoparticles which comprise the metal nanoparticles, to a functionalised material comprising the semiconductor metal oxide nanoparticles, and to a photocatalytic paint which comprises either the semiconductor metal oxide nanoparticles or the functionalised material. The invention also relates to processes for the preparation of all these materials, and to the use of the semiconductor metal oxide nanoparticles or the functionalised material comprising them as biocides; particularly for the treatment or prevention of a viral disease or a bacterial infection; for removing Volatile Organic Compounds (VOCs) from of air and water supplies, and as a photocatalyst for water splitting.

The invention discloses a metal sulfide catalyst for olefin / alkyne carboxylation reaction and a heterogeneous reaction process, the metal component of the catalyst is any one or more of Fe, Co, Ni, Cu, Zn, Cr, Mo and W, the S vacancy is an active center, and the concentration of the S vacancy is measured through in-situ NO chemisorption and is controllable in 50-500 [mu] mol gcat <-1 >. Metal, an S source compound and a template agent are evenly mixed according to a certain proportion, a template is etched after heat treatment is conducted for a certain time at a certain temperature, and remaining solids are reduced at the corresponding temperature. The obtained catalyst is used for olefin / alkyne carboxylation reaction, and the catalyst can directly convert olefin / alkyne, carbon monoxide and alcohol into ester compounds in one step with high efficiency and high selectivity under the action of hydrogen. The catalyst provided by the invention does not need any acid additive and can be recycled, a heterogeneous reaction process is carried out under a hydrogen condition, and the method has the advantages of high economic benefit, environmental friendliness, safety, easiness in operation and the like.

The invention belongs to the technical field of pigments, and particularly relates to an irreversible thermochromic pigment capable of memorizing temperature and a preparation method thereof.The irreversible thermochromic pigment capable of memorizing temperature can serve as a pigment to be coated on the surface of a normally-working machine or part, and once an instrument breaks down and is heated, the irreversible thermochromic pigment can memorize temperature. The position of a fault point and the comprehensive effect of the highest heating temperature can be memorized according to the color change of the surface material; the preparation method of the irreversible thermochromic pigment capable of memorizing the temperature comprises the following steps: step 1, preparing and storing a solution; step 2, stirring; step 3, adding a mineralizing agent; 4, cooling and transferring: after stirring for a certain time, spontaneously cooling the small beaker at room temperature, and transferring the reactant into a reaction kettle after the reactant is uniformly stirred; and 5, carrying out a drying reaction.

The invention provides a preparation method of a chromium-doped VO2 precursor, which comprises the following steps: removing silicon from a vanadium leaching solution to obtain a silicon-removed solution; adding a reducing agent into the silicon removal solution, adjusting the pH value of the solution, and reacting to obtain a tetravalent vanadium mixed solution containing trivalent chromium; adjusting the pH value of the tetravalent vanadium mixed solution containing trivalent chromium, and stirring to obtain a tetravalent vanadium mixed precipitate containing trivalent chromium; adding water into the tetravalent vanadium mixed precipitate containing trivalent chromium, pulping and filtering to obtain a tetravalent vanadium mixed filter cake containing trivalent chromium; and drying the tetravalent vanadium mixed filter cake containing trivalent chromium to obtain the chromium-doped VO2 precursor. By adopting the method disclosed by the invention, the chromium-doped VO2 precursor containing trivalent chromium and tetravalent vanadium can be obtained, and the technical problem that pentavalent vanadium sources such as V2O5, ammonium metavanadate and the like which are commonly used as synthesis raw materials of the lithium vanadium phosphate / sodium positive electrode material are relatively high in toxicity is solved.

The application relates to the field of organic metal synthesis, in particular to a preparation method of a metal carbonyl. The preparation method of the metal carbonyl comprises the following steps: mixing a chromium trichloride tetrahydrofuran complex and an ether solvent, then adding a Grignard reagent solution under a CO atmosphere, and performing reaction. The application improves the raw material form and the reaction sequence while keeping the basic reaction path of the Grignard reagent method for synthesizing chromium hexacarbonyl, provides a stable, controllable and industrial application prospect technical scheme for continuous preparation of chromium hexacarbonyl, and provides a new idea for preparation of the metal carbonyl.

A cold storage material, which has a large specific heat and a small magnetization in an extremely low temperature region and has satisfactory manufacturability, is provided, and a method for manufacturing the same is provided. Further, a refrigerator having high efficiency and excellent cooling performance is provided by filling this refrigerator with the above-described cold storage material. Moreover, a device incorporating a superconducting coil capable of reducing influence of magnetic noise derived from a cold storage material is provided. The cold storage material of embodiments is a granular body composed of an intermetallic compound in which the ThCr2Si2-type structure 11 occupies 80% by volume or more, and has a crystallite size of 70 nm or less.

A class of compositions comprising lithium metal oxide or oxyfluoride compounds having the general formula LiTM[n]OF, where TM[n] is a charge or d 0 [n] represents the number of transition metal species, including transition metal species distinguished by electronic shell structure, where [n] is at least four of the transition metal species, and the lithium metal oxide or oxyfluoride has a cation-disordered rock salt (DRX) structure and a relaxed SRO via a high-entropy DRX design strategy. Also featured are methods for synthesizing the high-entropy DRX lithium metal oxide or oxyfluoride compounds and their use in Li-ion batteries, particularly in the cathodes of such Li-ion batteries.