242 results about "Complex oxide" patented technology

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 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 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 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.

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.

The invention provides an indium-lead composite oxide nanowire and a preparation method and application thereof, the atomic ratio of In to Pb in the nanowire is 0.1-10, and the diameter of the nanowire is 10-300 nm. In the invention, the two metal components indium and lead generate a synergistic component effect and are applied to the electrochemical reduction process, so that the adsorption and activation of the raw materials are greatly enhanced. Different valence states of lead and indium are mutually adjusted, and the electronic structure of the catalyst is optimized. Meanwhile, more active sites can be exposed by the nanowire structure, and the reaction kinetics process is effectively improved by the three-dimensionally arranged nanoscale structure.

This invention discloses a method for preparing and applying a field-enhanced microfluidic ellipsoidal denitrification and dechlorobenzene catalyst. The catalyst uses titanium dioxide as a carrier, a composite oxide of cerium oxide and niobium oxide as the active component, ferrosoferric oxide as a morphology control agent, and a relay-coupled electromagnet as a morphology controller. Based on the carrier mass, the mass percentage of the active component is 10-20%, and the mass percentage of the morphology control agent is 5-10%. The catalyst synthesized by this method has advantages such as high specific surface area, good hydrophobicity, and dust filtration, and can achieve the goal of stationary source low-temperature denitrification and dechlorobenzene.

The application discloses a nanometer spherical low-temperature rare earth-based denitration and carbon monoxide removal catalyst and a preparation method and application thereof. The catalyst takes alumina as a carrier, takes a composite oxide of manganese dioxide and cerium dioxide as an active component, and takes iron oxide as a cocatalyst. The catalyst synthesized by the method has the advantages of a large specific surface area, sufficient exposure of active sites and nanometer limitation, and can realize the denitration and carbon monoxide removal targets of low-temperature flue gas working conditions of non-electricity industries such as steel and chemical industries.

To provide a metal evaporation method in which rare metal can be easily recovered.SOLUTION: A metal evaporation method evaporates at least a part of metal composition by heating, in a non-contact manner in the same container, a metal composition containing rare metal elements and a perovskite-type complex oxide expressed by Formula (1): ABHaO3-b (1) (where A denotes one or more kinds of elements selected from a group consisting of lanthanoid element and elements of group 2 in the periodic table, B denotes one or more kinds of elements selected from a group consisting of elements of group 3 in the periodic table, elements of group 4 in the periodic table and transition metal element of a fourth period of the element periodic table, symbols a and b are amounts of hydrogen and oxygen vacancy, respectively, and represent numerical values in the following range: 0≤a≤1.0, 0≤b≤0.5).SELECTED DRAWING: None

This invention relates to an additive for thermal desorption of polycyclic aromatic hydrocarbon (PAH) contaminated soil and its preparation method. It utilizes a composite oxide of manganese, rare earth metals, and transition metals to oxidize PAHs into low-carbon molecules during thermal desorption, achieving efficient removal, lowering the thermal desorption temperature, and saving energy consumption. The lower thermal desorption temperature reduces the loss of organic matter in the soil, facilitating the secondary use of the treated soil. The prepared composite oxide has a hollow spherical structure, which promotes sufficient contact and rapid reaction between PAHs and the composite oxide. The doping of transition metal elements into the manganese oxide and cerium oxide lattices creates oxygen vacancy defects, further enhancing the catalytic oxidation performance. Loading the manganese, rare earth metal, and transition metal composite oxide onto the surface of Fe3O4 improves its dispersion. Utilizing the magnetic properties of Fe3O4, the additive can be separated from the soil after desorption treatment, allowing for recycling.

The present invention pertains to infrared-absorbing particles containing a composite oxide containing an A1 element, which is one or more elements selected from H and alkali metals, an A2 element, which is one or more elements selected from Mg and alkaline earth metals, and a B element, which is one or more elements selected from V, Nb, and Ta, if the amount of substance of the element A1 contained in the composite oxide is expressed as x1, the amount of substance of the element A2 is expressed as x2, and the amount of substance of the element B is expressed as y, the relationships 0.002 < = (x1 + x2) / y < = 1.5, 0.001 < = x1 / y < = 1, and 0.001 < = x2 / y < = 1 are satisfied.

A spintronic device and an in-memory computing apparatus. The spintronic device comprises: a substrate; and a complex oxide layer and a magnetic tunnel junction structure, which are sequentially formed from bottom to top on the substrate, wherein there is a two-dimensional electron gas region at an interface of the complex oxide layer, and when a read / write voltage is applied to the spintronic device, a spin current generated by the magnetic tunnel junction structure tunnels into the two-dimensional electron gas region at the interface of the complex oxide layer, so as to change the density of a two-dimensional electron gas, such that the magnetic tunnel junction structure completes the reading or writing of data. Therefore, the effect of improving the reading reliability of the device is achieved.

The invention provides a catalyst as well as a preparation method and application thereof, and relates to the technical field of organic catalytic synthesis, the catalyst comprises a mesoporous zirconium-silicon composite oxide, and active metal cobalt and auxiliary metal which are loaded on the mesoporous zirconium-silicon composite oxide; the auxiliary metal comprises one or two of copper metal and nickel metal. Based on the catalyst provided by the invention, the problems of high cost, low active metal utilization efficiency, poor carrier stability and many byproducts of the catalyst in the prior art are solved.

The application discloses a rare earth composite oxide material and a preparation method and application thereof, and belongs to the technical field of cathode material preparation. x M 3‑ x N2O 7‑δ , wherein R is one or more of La, Pr, Nd, Sm, Eu, Gd and Y elements; M is one or more of Ba, Sr and Ca elements; N is one or more of Co, Fe, Ni, Mn and Cu elements, and 0.5<=x<=3. The rare earth composite oxide material has good structural stability and electrical conductivity, and is used as a cathode material of a solid oxide fuel cell and has excellent oxygen reduction reaction catalytic activity in a medium-low temperature range.

Provided is a positive electrode active material, a positive electrode, or a secondary battery having high charge load characteristics. The positive electrode active material includes a lithium complex oxide having a layered rock-salt structure. The lithium complex oxide contains lithium, a metal element including at least one of cobalt and nickel, and potassium. A ratio of a substance amount of potassium contained in the lithium complex oxide to a substance amount of the metal element included in the lithium complex oxide is 0.0005 or more and 0.03 or less. In the lithium complex oxide, potassium is distributed so as to extend in a direction intersecting a <001> direction of the layered rock-salt structure.