9results about How to "Components are easy to control" patented technology

The invention provides a platinum-palladium-based multi-component alloy sub-nanobelt catalyst as well as a preparation method and application thereof, and belongs to the technical field of nano material electro-catalysis. The element composition of the platinum-palladium-based multicomponent alloy sub-nanobelt catalyst disclosed by the invention is PtPdM, m is a non-noble metal, and the non-noble metal is one or more of Fe, Co, Ni, Ga and Zn; the preparation method comprises the following steps: ultrasonically mixing a metal precursor solution and a reduction solution to obtain a mixture, heating the mixture to react, centrifugally collecting a product, and calcining to obtain the platinum-palladium-based multicomponent alloy sub-nanobelt catalyst. The synthesis method disclosed by the invention is simple and controllable, and the obtained platinum-palladium-based multicomponent alloy sub-nanobelt catalyst has the characteristics of large specific surface area, rich active sites, low noble metal content and the like, and shows excellent oxygen reduction reaction catalytic performance in an acidic electrolyte.

The invention relates to the field of piezoelectric ceramic materials, in particular to a method for preparing piezoelectric ceramics by low-temperature sintering, which comprises the following steps: preparing first mixed powder by adopting a sol-hydrothermal method, mixing the first mixed powder with MCO3, Ga2O3, Nb2O5 and CuO, carrying out primary ball milling, drying to obtain second mixed powder, presintering the second mixed powder, carrying out secondary ball milling, and drying to obtain the piezoelectric ceramics. The preparation method comprises the following steps: preparing a raw material of the piezoelectric ceramic, carrying out granulation, sieving and pressing to obtain a green body, heating the green body to 550-650 DEG C in a first stage, carrying out heat preservation and glue removal for 1-3 h, heating the green body to 1000-1100 DEG C in a second stage, and sintering the green body for 1-3 h to obtain the piezoelectric ceramic, M being an alkaline earth metal, and the piezoelectric ceramic prepared by the method still has excellent piezoelectric properties during low-temperature sintering, and has industrial application values and market prospects.

The invention relates to an electrorheological fluid material of MOF / MoS2 hybrid particles and a preparation method of the electrorheological fluid material. The dispersed phase of the electrorheological fluid is anisotropic MOF / MoS2 nanoparticles, and the continuous phase is dimethyl silicone oil; the preparation process comprises the following steps: firstly, preparing MoS2 by adopting a hydrothermal method, and then preparing MOF / MoS2 nanoparticles by adopting a solvothermal method. The surface of the prepared MOF / MoS2 nanoparticles is attached with a petal-like lamellar structure, so that the interface polarization of the material is promoted. The electrorheological fluid prepared from the material and simethicone has extremely high electrorheological effect and anti-settling effect. A transmission electron microscope diagram of the MOF / MoS2 nano-particles is displayed in an attached drawing.

The application discloses a preparation method of a transition metal oxide and / or transition metal sulfide / carbon cloth composite wave-absorbing material, and belongs to the technical field of wave-absorbing materials. The method comprises the following steps: dissolving metal salt and sodium citrate in a mixed solvent to obtain a mixed solution; immersing hydrophilic carbon cloth treated by acid in the mixed solution, and then moving to a hydrothermal kettle for heat preservation treatment to obtain a transition metal oxide / carbon cloth; dissolving a sulfur-containing compound in an alcohol solution, immersing the transition metal oxide / carbon cloth in the alcohol solution containing the sulfur-containing compound, and then moving to the hydrothermal kettle for heat preservation treatment; adjusting the temperature and time of the heat preservation treatment to control the content of sulfide in the product, and finally obtaining a transition metal oxide / sulfide / carbon cloth or a transition metal sulfide / carbon cloth. The application further discloses the obtained transition metal oxide and / or transition metal sulfide / carbon cloth composite wave-absorbing material. The method is simple, the micro-morphology and components of the obtained material are controllable, the material has excellent wave-absorbing performance, and has a wide application prospect.

A lithium-mediated electrochemical method for ammonia synthesis, relating to the field of ammonia synthesis technology, solves the technical problems of severe side reactions, limited nitrogen mass transfer, and poor interfacial stability in existing lithium-mediated ammonia synthesis systems. Tetra(4-formylphenyl)porphyrin iron and an amino-containing multifunctional organic ligand are added to a mixed solvent of n-butanol and o-dichlorobenzene. An acid catalyst is added, and after stirring until homogeneous, the mixture is degassed and sealed for reaction. The solid product is collected by centrifugation, washed, and dried to obtain COF powder. This powder is then added to an ethanol-water solution, followed by ultrasonic dispersion with Nafion solution. The powder is then drop-coated / sprayed onto the surface of a carbon paper current collector and dried. This powder is used as the working electrode, with a platinum mesh as the counter electrode, a platinum wire as the quasi-reference electrode, and a LiBF4 tetrahydrofuran solution as the electrolyte. Ethanol is used as the proton donor, and electrolysis is performed under a nitrogen atmosphere using a constant current. This invention can be applied to the field of ammonia synthesis technology.

The invention relates to the technical field of perovskite solar cells, in particular to a perovskite thin film and a preparation method thereof, a perovskite solar cell and a preparation method thereof, and electric equipment. The perovskite thin film comprises an inorganic salt evaporation layer and an organic salt evaporation layer which are sequentially, circularly and alternately stacked. The inorganic salt evaporation layers comprise at least three layers, and the organic salt evaporation layers comprise at least two layers. The thickness of each inorganic salt evaporation layer is 10 to 300nm; and the thickness of each organic salt evaporation layer is 10-400 nm. The general formula of the perovskite thin film is FA1-y-zCsyMAzPbI3-xBrx, 0 < = x < = 1.5, 0 < = y < = 0.5, 0 < = z < = 0.5, and 0 < = y + z < = 0.5. The perovskite thin film not only can realize complete conversion of perovskite, but also can realize optimal matching of the energy level of a perovskite interface, and a high-efficiency perovskite thin film and a perovskite solar cell are obtained.

The invention discloses a composite diaphragm as well as a preparation method and application thereof, and relates to the field of flow batteries. The composite diaphragm comprises a basement membrane and a modified coating located on one side or two opposite sides of the basement membrane, the basement membrane comprises a middle layer and a transition layer which are integrally formed, the basement membrane is made of polymer resin, and the transition layer is formed by permeating components of the modified coating into the basement membrane; the modified coating comprises a filler and a binder, and the filler is at least one of a carbon material, a metal oxide and a mesoporous material. According to the composite diaphragm, the surface structure is reconstructed through the modified coating, the average pore size of the surface layer is reduced, when the composite diaphragm is applied to charge and discharge of the flow battery, the shuttle of active substances in an electrolyte can be blocked, the ion selective permeability is improved, the coulombic efficiency and the specific discharge capacity of the flow battery are remarkably improved, and the flow battery has excellent cycle stability.

The invention relates to a composition with a plant growth regulating function and a preparation method thereof, and belongs to the technical field of plant growth regulators. The invention uses cytokinin, auxin, brassinolide, zinc sulfate, a thickener, an antifreeze agent, and a self-made composite functional agent as raw materials to prepare a composition with a plant growth regulating function. The invention firstly mixes zinc sulfate and the antifreeze agent with deionized water and stirs to obtain a liquid A, and simultaneously dissolves the cytokinin, auxin, brassinolide, and the composite functional agent with an ethanol aqueous solution and stirs to mix at a high speed to obtain a liquid B, and finally compounding the thickener, the liquid A, and the liquid B according to a required ratio and ultrasonically dispersing to obtain a composition with a plant growth regulating function. The composition of the invention has uniform and controllable components, is uniform and stable, can be adapted to different types of tobacco, and the prepared composition can not only promote the growth of tobacco leaves, but also have a good inhibitory effect on a variety of pathogens and viruses.

This invention belongs to the field of metallic materials technology, specifically a TiZrMo-based refractory high-entropy alloy and its preparation method. The refractory high-entropy alloy is composed of any two of Al, Cr, and Nb, and Ti, Zr, and Mo. The atomic radius difference δ of the refractory high-entropy alloy is ≤6.6%, the alloy entropy enthalpy ratio Ω is ≥1.1, and the mixing enthalpy ΔH is... mix The energy density ranges from -18.0 to 4.0 kJ / mol, and the vacancy electron concentration (VEC) is <6.87. Furthermore, the preparation method of this invention has the advantages of simple steps, easily controllable composition, high production efficiency, and near-net-shape forming. The prepared refractory high-entropy alloy has a stable microstructure and a density of less than 7.00 g / cm³. 3 It has a Vickers hardness greater than 1400 HV, a room temperature compressive strength consistently above 980 MPa, an elongation at break greater than 10.8%, and an oxidation weight gain of less than 15.00 mg / cm³ at 800℃ for 12 hours. 2 It is low in cost and easy to apply on a large scale in industrial applications.