293 results about "Complex oxide" patented technology

A method for producing a pyrochlore-type oxide including, in the composition, a plurality of cations including an alkali metal cation, the method comprising: a mixing step (S10, S20) for mixing a plurality of raw materials each containing a plurality of cations; and a heating step (S11, S21) for heating the mixture containing the plurality of raw materials at a prescribed temperature by using a liquid phase method to generate a composite oxide including, in the composition, at least an alkali metal cation and having a corundum structure.

The invention provides a Ga-modified copper-based catalyst, a preparation method thereof and an application of the Ga-modified copper-based catalyst in preparation of methanol by hydrogenation of carbon dioxide, the Ga-modified copper-based catalyst comprises a carrier and an active component loaded on the carrier, the carrier is a Ga-modified TiO2-Al2O3 composite oxide, and the active component is a Cu oxide. The Ga-modified copper-based catalyst has the performance of catalyzing the reaction for preparing methanol through carbon dioxide hydrogenation, and methanol can be generated at high selectivity under the reaction conditions of low temperature and high pressure.

A positive electrode material coated with a composite oxide, a preparation method therefor, and the use thereof. The positive electrode material comprises an inner core and a coating layer on the surface of the inner core; the chemical general formula for the inner core is: NabNixFeyMnzM1-x-y-zO2, wherein 0.4 ≤ b ≤ 1.2, 0.10 ≤ x ≤ 0.50, 0.10 ≤ y ≤ 0.50, 0.10 ≤ z ≤ 0.50; the coating layer comprises a composite oxide, and the composite oxide comprises two or more metal elements. The positive electrode material is coated with the composite oxide, which significantly improves the conductivity and stability of the positive electrode material, reduces contact between the positive electrode material and an electrolyte, inhibits the occurrence of side reactions, and improves the cycle performance of the material.

The invention relates to the technical field of metal material coatings, in particular to a PVD composite coating and a preparation method thereof. The preparation method comprises the following steps: pretreating a metal matrix to obtain a pretreated matrix; carrying out magnetron sputtering deposition on the surface of the pretreated matrix by using a composite target material, carrying out plasma spraying and laser texturing for multiple times, and repeating the process to form a composite coating crude product containing a third rare earth doped high-entropy alloy coating; the composite coating crude product is subjected to post-treatment, and the composite coating is obtained; wherein the composite target material is AlCoCrFeNi-Y, and the composite oxide comprises aluminum oxide, titanium oxide and cerium oxide. According to the preparation method, the bonding strength, hardness and strength of the composite coating can be remarkably improved through magnetron sputtering deposition of the rare earth doped high-entropy alloy coating, plasma spraying formation of the composite ceramic coating with the gradient content, laser texturing treatment, alternate construction of multiple layers of coatings and the like in combination with elaborately selected materials with low expansion coefficients.

The invention relates to a catalyst for the hydrogen evolution reaction (HER) and methods for using the catalyst in a water-splitting process. A hydrogen evolution reaction (HER) electrocatalyst, and a method and use for preparing a HER electrocatalyst are disclosed. The method comprises the step of forming a two-dimensional electron gas (2DEG) interface at a heterojunction of at least one of two or more alternating layers of a first complex oxide and a second complex oxide, wherein the or each 2DEG interface exhibits a current density, corresponding to an intrinsic hydrogen evolution reaction (HER) activity that renders the 2DEG interface(s) suitable as an HER electrocatalyst for producing hydrogen (H2) from a water-based electrolyte by water electrolysis.

A method for extracting oxygen and metal from lunar-based mineral resources comprises the following steps: in a vacuum / inert gas atmosphere, lunar soil which is not subjected to mineral separation treatment is directly contained in a conductive current collector device and serves as a working cathode, and an inert oxygen evolution anode and electrolyte are matched to form a molten salt electrolytic bath; after the electrolysis reactor is heated to a preset operation temperature, electrifying electrolysis is carried out under the driving force of an external power supply, and oxygen is separated out by an anode and collected by a gas collecting device; after a preset electrolysis mechanism and electrolysis time, the cathode current collector is recycled from the electrolytic bath, and a metal product is obtained; and a new cathode current collector is replaced to realize continuous process operation. A traditional process for extracting oxygen and metal from lunar soil usually only focuses on preparation of metal or oxygen, and the oxygen and the metal cannot be prepared at the same time. According to the method, the lunar soil composite oxide raw material is subjected to solid-phase electrochemical reduction, the aim of synchronously producing oxygen and metal is achieved, and a new short-process metallurgical process route for preparing metal and oxygen through direct electrolysis of lunar soil without mineral separation treatment is achieved.

A positive electrode mixture layer in this secondary battery contains a first positive electrode active material having a particle fracture strength of 90 MPa or less and a second positive electrode active material having a particle fracture strength of 110 MPa or greater. The first positive electrode active material is a lithium transition metal complex oxide that contains Ni and Mn, and has a Co content ratio of 1 mol % or less. The second positive electrode active material is a lithium transition metal complex oxide that contains Ni and Co, and has a Co content ratio of 3 mol % or greater. Regarding the positive electrode mixture layer, the content of the first positive active material is at least 5 mass % but less than 50 mass % with respect to the combined mass of the first positive electrode active material and the second positive electrode active material.

The invention discloses a reinforced high-pressure flange composite material containing nano tungsten carbide and a preparation method thereof.The composite material comprises, by weight, 96.0%-98.3% of base material SAF2205 duplex stainless steel, the duplex stainless steel comprises 21.0%-23.0% of chromium, 4.5%-6.5% of nickel, 2.5%-3.5% of molybdenum, 0.18%-0.25% of nitrogen, 0.01%-0.03% of carbon and the balance iron; a reinforcing phase: 0.5-1.5% of nano tungsten carbide, the particle size of which is 50-100 nm; the substance combination comprises the following components in percentage by weight: (a) 0.3-0.5% of molybdenum disulfide (MoS2) nanosheets with the thickness of 5-20 nm; (b) 0.1-0.3% of graphite fluoride micro powder with a particle size of 1-3 [mu] m; (c) 0.3 to 0.6 percent of V2O5-B2O3 composite oxide, wherein the weight ratio of V2O5 to B2O3 is 3 to 2; (d) 0.2 to 0.5 percent of Y2O3 surface modified nano silver (Ag-Y2O3) composite powder, wherein the diameter of a silver core is 20 to 50nm, and the thickness of a Y2O3 shell layer is 5 to 10nm; (e) 0.3-0.7% of a graphene / zirconium oxide (G / ZrO2) nano composite material, the weight ratio of graphene to ZrO2 is 1: 2, and the particle size of ZrO2 is 15-30 nm; the material combination solves the problem of stress corrosion cracking sensitivity of the duplex stainless steel flange in a high-temperature and high-pressure corrosive medium by forming a multistage interface regulation and control network and a shell-core-shell multilayer structure system.

The invention discloses a preparation method and application of a microsphere ceramic particle flue gas denitration catalyst, the catalyst takes a composite oxide of copper oxide and silicon oxide as a carrier, platinum nanoparticles as an active component and vanadium oxide as a cocatalyst, and the catalyst is prepared by a combined method of electrochemical deposition, high-temperature roasting and impregnation loading. Based on the mass of the carrier, the mass percentage content of the active component is 1-3%, and the mass percentage content of the cocatalyst is 5-10%, and the catalyst synthesized by the method has excellent conversion rate and selectivity, can realize efficient removal of nitrogen oxides, and has high economic value and wide market application prospect.

A positive electrode according to the invention is a positive electrode including a positive electrode active material layer formed on a positive electrode current collector, wherein the positive electrode active material layer includes lithium iron phosphate compound-based first positive electrode active material and a lithium nickel manganese cobalt complex oxide-based second positive electrode active material, wherein the second positive electrode active material is 10 wt% or less, based on the total weight of the first positive electrode active material and the second positive electrode active material, and the ratio (=B / A) of the average particle diameter (D50) B of the second positive electrode active material to the average particle diameter (D50) A of the first positive electrode active material is 3 or more. The positive electrode according to one embodiment of the present invention, due to the improved rolling performance, the loading amount of the positive electrode can be increased, and the thickness of the positive electrode active material layer can be significantly reduced through rolling, which has the effect of providing a high energy density lithium iron phosphate-based positive electrode.

The invention discloses a trimetallic spinel oxide / high-valence metal oxide composite OER electrocatalyst and a preparation method thereof. The method comprises the following steps: firstly, synthesizing trimetal LDH nanosheets with rich defects in one step through a colloid mill, then inserting high-valence transition metal oxyacid radical ions into LDH layers by utilizing an ion exchange method, and finally, enabling LDH to be topologically converted into a spinel structure by adopting a low-temperature thermal oxidation method and generating more defects at the same time, so as to prepare the composite oxide electrocatalyst. Based on the adjustable property of interlayer anions of layered double hydroxides, a nucleation crystallization isolation method, an ion exchange method and a thermal oxidation technology are combined, the composite oxide electrocatalyst with an ultrathin nanosheet structure and rich surface defects is prepared, and the composite oxide electrocatalyst has the OER catalytic performance far higher than that of precious metal.

The invention discloses a preparation method of a complex oxide interface one-dimensional system. According to the method, a pulse laser deposition technology is utilized, based on a step structure of a substrate, a novel one-dimensional nano material of a complex oxide is prepared through a growth mode of flowing along a step, and the method comprises the steps that a material S is epitaxially grown on the substrate, the thickness of the material S is one step height, and the transverse width of the material S is L1; a material B is laterally and epitaxially grown on the substrate or the material S along the edge of the new step, the lateral width is L2, and the thickness is the height of one step; taking L1 + L2 as a period, and repeatedly growing for n periods; the steps are repeated, N repetitions are achieved in the longitudinal direction, and then preparation of the complex oxide novel interface one-dimensional system is achieved. The method disclosed by the invention develops a new material interface regulation and control way, can be popularized to other associated systems, and lays a physical foundation for research and development of all-oxide spinning electronic devices.

The invention relates to a method for preparing methanol through hydrogenation of carbon dioxide. The method comprises the following steps: sequentially introducing raw material gas into a first fixed bed reactor filled with a catalyst, the interior of a membrane tube of a first membrane reactor, a second fixed bed reactor filled with a catalyst, the interior of a membrane tube of a second membrane reactor and a third fixed bed reactor filled with a catalyst; purging gas is respectively introduced into the exterior of the membrane tube of the first membrane reactor and the exterior of the membrane tube of the second membrane reactor; the catalyst comprises a metal oxide carrier and an active metal component, the active metal component is Pd, and the metal oxide carrier is an indium-zirconium composite oxide with an ordered mesoporous structure; the membrane tube of the first membrane reactor and the membrane tube of the second membrane reactor respectively comprise a membrane support body and a membrane functional layer covering the inner surface of the membrane support body, and the membrane functional layer is a molecular sieve membrane. The method provided by the invention has high catalytic activity and selectivity, and can significantly improve the conversion rate of carbon dioxide and the content of methanol in the product.

The application discloses high-temperature piezoelectric ceramics for high-power scenes and a preparation method thereof, and belongs to the technical field of piezoelectric ceramics. The high-temperature piezoelectric ceramic is Mn-doped lead zirconate titanate-based piezoelectric ceramic; the lead zirconate titanate-based piezoelectric ceramic is a three-phase solid solution of Pb(Yb 1 / 2 Nb 1 / 2 )O3, PbZrO3 and PbTiO3; and the doping mode of the Mn element is metal oxide MnO2 doping or composite oxide Pb(Mn 1 / 3 Nb 2 / 3 )O3 doping. The application solves the process problems existing in material industrialization by controlling the composition of the material, overcomes the problem that high piezoelectric performance and high Curie temperature and high mechanical quality factor are difficult to be compatible, and obtains high-power high-temperature piezoelectric ceramics with excellent comprehensive performance.

A rare earth ion doped complex oxide with Formula (I) (Ca1+xMgSi2Eu0025O6+x (x = 0.2, 0.4, 0.6, 0.8, 1.2, 1.4, 1.6, 1.8, 2.0)) or Formula (II) (Mg1-xCo3NiCuZnCexO8+x (x = 0.05, 0.1, 0.5, 1.0)). A method of preparing said rare earth ion doped complex oxide, and the use of said complex oxide in photoluminescence phosphor are also addressed. A method 5 of predicting photoluminescence emission characteristics of the complex oxide is further addressed.

To provide a novel composite oxide and a semiconductor device which has excellent electric characteristics and of which the reliability is high.SOLUTION: A composite oxide includes at least two regions 001 and 002. The region 001 contains In, Zn and an element M1 (the element M1 is one or more of Al, Ga, Si, B, Y, Ti, Fe, Ni, Ge, Zr, Mo, La, Ce, Nd, Hf, Ta, W, Mg, V, Be and Cu). The region 002 contains In, Zn and an element M2 (the element M2 is one or more of Al, Ga, Si, B, Y, Ti, Fe, Ni, Ge, Zr, Mo, La, Ce, Nd, Hf, Ta, W, Mg, V, Be and Cu). When the composite oxide is analyzed by energy dispersive X-ray spectroscopy, the element M1 in the region 001 is detected less than the element M2 in the region 002. A peripheral part of the region 001 is observed blurred by mapping analysis in the energy dispersive X-ray spectroscopy.SELECTED DRAWING: Figure 1

In a piezoelectric element in which a lower electrode, a piezoelectric layer formed of a perovskite-type complex oxide, and an upper electrode are laminated in a laminating direction, the upper electrode has a first hydrogen absorbing layer that absorbs hydrogen. The upper electrode of the piezoelectric element preferably has a second hydrogen absorbing layer different from the first hydrogen absorbing layer. In the piezoelectric element, the film thickness of the first hydrogen absorbing layer is preferably thicker than the film thickness of the second hydrogen absorbing layer in the laminating direction.

Provided are: a nonaqueous electrolyte secondary battery positive electrode active material that has high crystallinity, that causes less amount of Mn deposition on a negative electrode, and that can form a secondary battery having excellent cycle characteristics; and a nonaqueous electrolyte secondary battery using the nonaqueous electrolyte secondary battery positive electrode active material. The nonaqueous electrolyte secondary battery positive electrode active material according to the present invention is formed of a lithium-manganese-nickel complex oxide including a spinel-type crystal structure, wherein the lithium-manganese-nickel complex oxide has a crystallite diameter not smaller than 1000 Å and is formed of primary particles that have a polyhedron shape having more than eight surfaces. The proportion of ungrown particles not having the polyhedron shape of the primary particles in the lithium-manganese-nickel complex oxide is preferably not higher than 5%.

The present invention relates to an Fe-Ni alloy consisting of C: 0.001 to 0.2 mass%, Si: 0.001 to 0.2 mass%, Mn: 0.005 to 0.7 mass%, Ni: 30.0 to 45.0 mass%, Cr: 0.3 mass% or less, Al: 0.001 to 0.1 mass%, Ti: 0.001 to 0.020 mass%, O: 0.007 mass% or less, Mg: 0.0030 mass% or less, N: 0.010 mass% or less, Ca: 0.0015 mass% or less, Na: 0.00005 to 0.001 mass%, the balance being Fe and unavoidable impurities, wherein non-metallic inclusions containing CaO-SiO2-Al2O3-MgO-MnO-Na2O-based complex oxides as essential components, and further containing one or more non-metallic inclusions of CaO, MgO, MgO·Al2O3, MnO·SiO2, and Na2O as optional components, wherein the number ratio of CaO-SiO2-Al2O3-MgO-MnO-Na2O inclusions is 40% or more in all non-metallic inclusions, thereby producing an Fe-Ni alloy having excellent surface properties.

The invention discloses a high-bending-strength aluminum nitride ceramic sintered body and a preparation method thereof, relates to the technical field of ceramic materials, and solves the technical problem that an existing AlN ceramic material is relatively low in bending strength. Comprising the following steps: carrying out ball milling on aluminum nitride powder, a sintering aid, an additive and a solvent to obtain mixed slurry; performing defoaming, tape casting, degreasing and sintering on the mixed slurry to obtain a high-bending-strength aluminum nitride ceramic sintered body; wherein the sintering aid is a Y2O3-Ca (Y-Sm) O3 perovskite type composite oxide, and the sintering aid is obtained by adding Sm2O3 and Ca (OH) 2 into a YCl3 solution, co-precipitating at 70-90 DEG C in an alkaline environment, and calcining; by adopting the method disclosed by the invention, the bending strength and the heat conductivity of the material can be effectively improved, so that the bending strength of the prepared aluminum nitride ceramic sintered body can reach 631 MPa, and meanwhile, the heat conductivity reaches 211.7 W / mK.

Provided is a positive electrode active material for a non-aqueous electrolyte secondary battery, the positive electrode active material being capable of improving initial efficiency. The positive electrode active material for a nonaqueous electrolyte secondary battery, which is contained in the nonaqueous electrolyte secondary battery, contains a lithium transition metal composite oxide and a sulfonic acid compound that is present on the surface of the lithium transition metal composite oxide. The lithium transition metal composite oxide is secondary particles having a layered structure and containing 75 mol% or more of Ni with respect to the total number of moles of metal elements other than Li, and the Gini coefficient of SO3-on the surface of the secondary particles is 0.7 or less in the element concentration distribution in the cross section of the secondary particles using time-of-flight secondary ion mass spectrometry. (In the formula, A is a group 1 element or a group 2 element, R is a hydrocarbon group, and n is 1 or 2. )

The present invention relates to a catalytic article for treating an exhaust gas stream, the catalytic article comprising:-a substrate having an inlet end and an outlet end defining an axial length; -a first coating extending part or the entire axial length of the substrate, the first coating comprising a first catalyst comprising a vanadium component; -a second coating extending part or the entire axial length of the substrate, the second coating comprising a second catalyst comprising a noble metal component; and-a third coating extending part or the entire axial length of the substrate, the third coating comprising or consisting of an inorganic oxide selected from the group consisting of titanium oxide, silicon oxide, zirconium oxide, tungsten oxide, rare earth oxides such as lanthanum oxide and cerium oxide, any combination thereof or a composite oxide thereof, wherein the third coating is positioned as an intermediate layer between the first coating and the second coating over part or the entire axial length of the substrate. The invention also relates to a method and system for treating an exhaust stream containing nitrogen oxides with the catalytic article.

In a metal oxide sintered body for thermistors, a thermistor element, and a method for manufacturing a metal oxide sintered body for thermistors of the present invention, by having a protection layer other than an Y2O3 layer, a change in resistance value caused by reduction is minimized even at a high temperature and a change in resistance value occurring during formic acid reflow mounting is suppressed. A metal oxide sintered body 1 for thermistors according to the present invention has an (Ma, Y) oxide layer 3 formed on the surface of a complex oxide sintered body part 2 represented by a general formula: (1-z)(Ma1-yMby)(Cr1-xMnx)O3+zY2O3 (wherein Ma represents at least one trivalent metal element having an ion radius greater than that of Y, Mb represents at least one of Mg, Ca, Sr, and Ba, and 0.0≤x≤1.0, 0.0<y<0.5, and 0<z≤0.8 are satisfied).

The invention relates to the technical field of precious metal extraction, in particular to a method for enriching platinum and palladium from a material containing high copper and sulfur. Oxidizing roasting; leaching with hydrochloric acid; copper precipitation treatment and ammonium chloride precipitation. In the oxidizing roasting stage, roasting is conducted in the oxygen atmosphere, the interference of sulfur on follow-up platinum and palladium enrichment is effectively reduced, a pretreated material and lead oxide are mixed according to the specific mass ratio, platinum and palladium elementary substances are converted into composite oxide easily dissolved in hydrochloric acid, and follow-up leaching of platinum and palladium is facilitated; in the hydrochloric acid leaching link, platinum, palladium and copper in the roasted product are fully dissolved, and the metal leaching rate is increased; during copper deposition treatment, iron powder is added according to the accurate molar ratio of the iron powder to copper ions, the copper ions are converted into copper slag precipitates, and efficient separation of copper, platinum and palladium is achieved; in the ammonium chloride precipitation step, ammonium chloride is accurately added according to the total molar weight of platinum and palladium in the filtrate, so that platinum and palladium are fully precipitated, and crude platinum and palladium products are obtained.

The application discloses a preparation method of super-high-entropy complex oxide powder material for thermal barrier coating and application thereof, and comprises the following steps: S1, uniformly dispersing a rare earth element source and a transition metal element source in deionized water, stirring and treating at 80 DEG C, then adding a complexing agent and a dispersing agent to obtain a mixture A; S2, adjusting the pH of the mixture A system to 4-5 by using ammonia water under stirring at 80 DEG C, continuously stirring and treating to form a gel, and drying to obtain a dry gel; S3, sintering the dry gel at 1400 DEG C for 2h to obtain the super-high-entropy complex oxide powder material. The application makes up the shortcomings of traditional thermal barrier coating YSZ material, can still maintain phase stability near 1500 DEG C, widens the thermal barrier coating material system to the super-high-entropy complex ceramic field, and the material has the characteristics of uniform element distribution, small and uniform powder particle size, high purity and the like, and the method has low requirement on equipment and is simple in synthesis method.

The invention provides a method for preparing methanol by hydrogenating carbon dioxide, which is characterized by comprising the following steps of: introducing raw material gas into the outer side of a membrane tube of a membrane reactor, and introducing purging gas into the inner side of the membrane tube of the membrane reactor; wherein the membrane tube of the membrane reactor comprises a membrane support body and a membrane functional layer covering the outer surface of the membrane support body; the membrane functional layer is a CHA molecular sieve membrane; the outer part of the membrane reaction cavity is filled with a catalyst; the catalyst comprises a metal oxide carrier and an active metal component loaded on the metal oxide carrier; the active metal component is Pd, and the metal oxide carrier is an indium-zirconium composite oxide with an ordered mesoporous structure. The membrane reactor is adopted to reinforce the CO2 hydrogenation methanol preparation reaction, so that water generated in the reaction process can be removed in time, and the methanol catalytic reaction is effectively promoted.

To provide a positive electrode active material for a lithium secondary battery with an excellent lifetime characteristic.SOLUTION: The present invention relates to a positive electrode active material, a manufacturing method for the same, a positive electrode including the same, and a lithium secondary battery including the positive electrode. More specifically, a lithium complex oxide and a coating layer on a surface of the lithium complex oxide are included. The positive electrode active material further includes sodium (Na) and sulfur (S). The mass fraction (S / Na) of S to Na described above is 1 to 3.SELECTED DRAWING: Figure 6

A hydrocarbon reforming catalyst used for forming a synthetic gas containing hydrogen and carbon monoxide from a hydrocarbon-based gas, the hydrocarbon reforming catalyst containing a complex oxide having a perovskite structure, wherein the complex oxide has a crystal phase containing SrZrO3 as a primary component and contains Ru.

The present invention relates to a positive electrode active material, a method of preparing the same, a positive electrode, and a rechargeable lithium battery. The method for preparing the positive electrode active material can include: (i) adding an aluminum raw material and sodium hydroxide to an aqueous (e.g., water-soluble) solvent to prepare a coating solution having a pH range of 12.5 to 14; (ii) adding core particles including a lithium-nickel-based complex oxide to the coating solution to prepare a first mixed solution; (iii) adding a cobalt raw material to the first mixed solution to prepare a second mixed solution; and (iv) drying and heat-treating the second mixed solution to obtain the positive electrode active material.

The invention relates to a high-durability fuel cell platinum-based catalyst and a preparation method thereof, the fuel cell platinum-based catalyst comprises a platinum-based catalyst and a metal oxide, and the metal oxide covers a part of the surface of the platinum-based catalyst; the metal oxide comprises an indium element. An indium oxide or an indium-containing composite oxide is modified on the surface of the platinum-based catalyst, and the oxide can be stably combined on the surface of the platinum-based catalyst to form epitaxial growth and form an interface site with the platinum catalyst, so that the fuel cell catalytic activity of the platinum catalyst can be promoted. Meanwhile, by controlling the reasonable coverage degree of the metal oxide on the surface of the platinum-based catalyst, the number of active sites exposed by the platinum catalyst is reserved, and the catalytic performance of the oxygen reduction reaction of the cathode of the fuel cell is improved to the maximum extent.