16results about How to "Prevent structural collapse" patented technology

The invention relates to the technical field of electrocatalysis, in particular to an oxygen / sulfur heterostructure oxygen evolution electrocatalyst and a preparation method and application thereof. Based on an in-situ oxidation strategy, a CuFeO layer is generated on the surface of CuFeS, and the CuFeS-coated CuFeO high-performance oxygen evolution electrocatalyst with a heterostructure is obtained. By constructing a sulfide-oxide heterojunction, a built-in electric field can be formed at an interface to promote charge separation and transfer, so that the electrocatalytic activity is remarkably improved. And on the other hand, the CuFeO layer on the outer layer serves as an armor, and the problem of oxidation of the surface of CuFeS is solved. The electro-catalytic performance and the long-term stability are obviously improved.

This invention discloses Ni2Fe(SO4) 0.5 (OH)6(H2O) 3.85 This paper discusses / NF catalysts, their preparation methods, and applications, belonging to the field of catalyst synthesis technology. Using large-size nickel foam as a substrate, Ni₂Fe(SO₄) is directly prepared through one-step in-situ microwave-driven growth. 0.5 (OH)6(H2O) 3.85 The nanosheet array eliminates the need for subsequent loading or additional processing, simplifying the process and enhancing the bond between the catalyst and the substrate. This catalyst exhibits excellent performance in hydrogen production via water electrolysis, particularly in seawater electrolysis.

This invention discloses a bulk acoustic wave (BAW) device and its fabrication method. The BAW device includes: a substrate with a first groove on one side; a blocking layer located on the sidewall of the first groove and covering the entire sidewall of the first groove; a support structure located within the first groove; and a piezoelectric stacked structure located on one side of the substrate, specifically on the side of the support structure furthest from the substrate. This invention solves the problems of insufficient mechanical stability, susceptibility to external stress, and poor heat dissipation of traditional BAW devices.

Provided is a thermal barrier for a secondary battery, the thermal barrier including: a metal housing having an internal space; the cooling thermal insulation material is arranged in the metal shell; a metal support accommodating the metal housing; and an encapsulation pocket surrounding the metal support, where the metal support includes a first plate and a second plate, and the metal housing is accommodated between the first plate and the second plate.

The present application relates to the technical field of thermal insulation coating, and proposes a nano-porous aerogel thermal insulation coating and a preparation method thereof, and a raw material of the nano-porous aerogel thermal insulation coating, which comprises the following components in parts by weight: modified silica aerogel 10-25 parts, epoxy acrylate resin 40-55 parts, sodium polyacrylate 5-8 parts, dispersing agent 1-1.5 parts, and defoaming agent 0.5-1 part; the modified silica aerogel is boron oxide modified silica aerogel. Through the above technical solution, the problem of poor thermal insulation performance and mechanical properties of the aerogel thermal insulation coating in the prior art is solved.

The application discloses a perovskite solar cell based on inhibition of boundary layer defects and a preparation method thereof, and belongs to the technical field of perovskite solar cells. The disclosed method comprises the following steps: S1, sequentially preparing a hole transport layer and a perovskite light absorption layer on a conductive substrate; then applying a boundary layer repair solution to the surface of the perovskite light absorption layer to form a boundary layer repair wet film; the boundary layer repair solution is obtained by dissolving 5-chloro tryptamine hydrochloride in a solvent; S2, annealing the boundary layer repair wet film to make 5-chloro tryptamine hydrochloride chemically react with the perovskite surface interface, thereby forming a boundary modification layer at the surface interface of the perovskite light absorption layer; and S3, sequentially preparing an electron transport layer and a back electrode to obtain the perovskite solar cell based on inhibition of boundary layer defects. The technical problem that the existing method is difficult to fundamentally inhibit the boundary layer defects and improve the long-term stability of the perovskite solar cell is solved.

The application belongs to the technical field of electrocatalytic material preparation, and discloses a method for preparing a cobalt tungstate electrode based on gas-phase replacement, an electrode and application. 3 A seed layer is formed on the surface of the conductive substrate; then the conductive substrate is placed in a hydrothermal reaction solution containing tungstate, and a hydrothermal reaction is performed; after cleaning and drying, annealing treatment is performed, so that a WO3 nanosheet array is obtained on the conductive substrate; then the conductive substrate and a volatile cobalt source are placed in a protective atmosphere and under negative pressure to perform a gas-phase cation replacement reaction, so that a cobalt tungstate multistage nanostructure electrode is obtained. The application utilizes the characteristics of gas-phase reaction, and on the basis of inheriting the two-dimensional array structure of the precursor, a hierarchical rough morphology is constructed in situ; the prepared cobalt tungstate multistage nanostructure electrode exhibits excellent catalytic activity in the electrocatalytic oxygen evolution reaction in an alkaline medium, the process is simple and the parameters are controllable, and the application has good application prospect.

The application relates to a polyionic liquid binder suitable for vulcanized polyacrylonitrile and a preparation method and application thereof, which is obtained by carrying out an alkylation reaction and a polymerization reaction on bromo-n-butane and 1-vinylimidazole, and then carrying out an anion exchange reaction on lithium bis(trifluoromethylsulfonyl) imide and sodium anthraquinone-2-sulfonate. The polyionic liquid binder can anchor polysulfide on the polymer chain through the electrostatic interaction between the lone pair electrons in the molecular chain and the polysulfide, effectively inhibits the shuttle effect, contains a quinoid structure which can act as a redox medium to accelerate the electron transfer process and improve the interface kinetic performance of the SPAN positive electrode, has excellent bonding performance and mechanical strength, can significantly improve the structural integrity and electronic conduction continuity of the electrode in the cycle process, and prolongs the cycle life of the electrode. The obtained binder can be widely applied to SPAN-based positive electrodes of lithium ion batteries and provides effective technical support for solving key problems such as volume expansion and poor conductivity of SPAN materials.

The invention discloses a gradient in-situ doped gradient lithium-rich positive electrode material and a preparation method, and relates to the field of lithium ion battery positive electrode materials. The general formula is xLi2MnO3. 1-xLi (TM, M) O2, where 0 lt; xlt; tM is one or two of Mn and Ni, and TM at least comprises Ni; the internal Mn concentration is reduced in a gradient mode from the center to the surface layer, and the Ni concentration is increased in a gradient mode from the center to the surface layer. The material comprises a doping element M, the doping element M is selected from at least one of Al, Mg, Ti, Nb, Ta, Mo, W, Zr and Co, and the ratio of the molar weight of the doping element M to the total molar weight of Ni and Mn ranges from 1: 2000 to 1: 100; and spatial distribution: the distribution of the doping element M in the particles is changed in a positive or / and negative gradient manner. And the charge transfer impedance is reduced and the diffusion rate of lithium ions is improved due to the nickel-rich surface layer and gradient-change doping distribution.

This invention relates to the field of catalyst technology, specifically to a method for preparing and applying a modified metal sulfide catalyst for the co-conversion of acidic natural gas. The preparation method includes: S1. Dissolving ammonium molybdate tetrahydrate in a modified solvent and stirring until completely dissolved to obtain a transparent and homogeneous solution; S2. Adding 2-3 parts of a modified support precursor to the solution and transferring it to an autoclave for reaction for 22-24 hours; S3. Centrifuging the solution and washing the precipitate 2-3 times with deionized water and anhydrous ethanol, respectively, followed by drying and grinding to obtain the modified metal sulfide catalyst. This invention utilizes concentrated light technology to synergistically apply light and heat energy to the reaction system, achieving high-efficiency conversion at a lower temperature (450-550℃) and atmospheric pressure compared to traditional thermocatalysis, significantly reducing energy consumption. It is the first catalyst designed for CH4. 4 and H 2 A metal sulfide composite catalyst system for S-concentrated photocatalytic co-conversion converts two harmful / low-value gases into high-value CS in one step. 2 and clean H 2 This has enabled "waste treatment" and resource recycling.

The invention discloses an anti-static wafer PVCWafer protective film and a preparation method thereof, and belongs to the technical field of PVC thin films, hydroxyl on a polyborosiloxane molecular chain and silicon hydroxyl on the surface of modified nickel composite hollow carbon fiber are condensed, polyborosiloxane / hollow carbon fiber is used as rigid filler and can be uniformly dispersed in a polyvinyl chloride matrix, and the reason is that the rigid filler can be uniformly dispersed in the polyvinyl chloride matrix, so that the anti-static wafer PVCWafer protective film is prepared. Polyborosiloxane molecules contain a large number of silicon-oxygen bonds and boron-oxygen bonds, the groups have high polarity, compatibility with polyvinyl chloride can be improved, organosiloxane chain segments of polyborosiloxane have certain flexibility, the organosiloxane chain segments can serve as flexible buffer layers, rigidity difference between polyborosiloxane / hollow carbon fibers and polyvinyl chloride is relieved, and therefore the service life of the hollow carbon fibers is prolonged. The interface stress concentration is reduced, and the compatibility of the two is further improved.

The invention discloses a high-strength flame-retardant phenolic aldehyde fireproof thermal insulation integrated board and a preparation method thereof, and belongs to the technical field of building materials. Phenolic resin, modified expanded vermiculite, polyphenyl particles, graphite polyphenyl particles, perlite particles and hexamethylenetetramine are mixed and stirred to obtain a mixture, and the mixture is subjected to hot press molding to obtain a structural layer phenolic board; taking a phenolic aldehyde insulation board as a middle layer, sequentially laying non-woven fabric on the surface of one side of the core material, smearing bonding mortar, attaching a structural layer phenolic aldehyde board, laying alkali-resistant glass fiber mesh cloth, smearing anti-crack mortar, and standing for 15 minutes; laying a non-woven fabric on the other side of the core material according to the same process, coating the non-woven fabric with adhesive mortar, attaching a second structural layer phenolic aldehyde plate, laying an alkali-resistant fiberglass mesh, and coating anti-crack mortar to obtain a prefabricated integrated plate; and standing and curing the prefabricated integrated plate to obtain the integrated plate. The obtained integrated plate has good mechanical property, flame retardant effect and heat preservation performance, and meets the requirement for integration of fire prevention and heat preservation of buildings.

This invention relates to the field of silicone technology, specifically to a silicone composite thermally conductive material and its preparation process. The preparation process of a silicone composite thermally conductive material includes: pretreatment of graphene filler, preparation of modified graphene filler, preparation and modification of heterogeneous filler, and preparation of the silicone composite thermally conductive material. This invention utilizes modified graphene and the construction of a boron nitride-silica heterogeneous filler to form a multi-level thermally conductive network. Combined with electric field-induced ordered arrangement of fillers and pretreatment of graphene with chemically reduced gel and directional ice template, multiple methods are used synergistically to reduce interfacial thermal resistance and phonon scattering, constructing continuous thermally conductive channels. Simultaneously, it improves the structural uniformity, thermal conductivity stability, and mechanical properties of the composite material, effectively solving problems such as filler agglomeration and migration, and significantly improving the thermal conductivity of the silicone composite material.

The invention provides a potassium permanganate loaded attapulgite / silicon dioxide aerogel gas scavenger and a preparation method, and relates to the field of food preservation, the potassium permanganate loaded attapulgite / silicon dioxide aerogel gas scavenger comprises an inorganic porous composite carrier and KMnO4 loaded on the inorganic porous composite carrier; the porous inorganic composite carrier is ATP / SiO2 aerogel formed by attapulgite ATP and SiO2, and is specifically obtained by adsorbing a KMnO4 solution by ATP modified SiO2 aerogel and drying; the technical obstacle that the SiO2 aerogel and the KMnO4 cannot be directly combined due to the fact that the SiO2 aerogel is easy to reduce the KMnO4 is overcome, the reducibility of the aerogel is eliminated, the structural stability of the material is enhanced, the formability and the thermal stability of the material are guaranteed, and the KMnO4 loading capacity of the material is greatly improved.

The application discloses an intelligent sustained-release drug carrier screening method based on material microscopic image recognition, integrates nanometer hyperspectral, cryo-EM and Raman spectral data through a multi-modal data synchronous acquisition system, realizes nanoscale spatial alignment of microscopic morphology and component distribution, adopts a non-local mean denoising algorithm to enhance pore structure identification, combines adaptive baseline correction and multi-peak fitting technology, and quantifies chemical bond state changes, constructs a characteristic spectral library, generates a chemical distribution map through spectral angle mapping, combines spatial mutual information entropy to analyze the co-localization of carriers and drugs, innovatively develops a space-spectrum joint encoder, fuses multi-modal features by using a cross attention mechanism, and outputs quantitative indexes such as pore filling rate, crystallinity change and interaction stability score. The method breaks through the static and single-modal limitation of traditional methods, and establishes a complete screening system from microscopic structure analysis to release kinetics prediction.

The application relates to a positive electrode sheet, a preparation method of the positive electrode sheet and a battery. The positive electrode sheet comprises a current collector (100), a first positive electrode active material layer (110) and a second positive electrode active material layer (120), the first positive electrode active material layer (110) is coated on the surface of the current collector (100), and the second positive electrode active material layer (120) is coated on the surface of the first positive electrode active material layer (110) away from the current collector (100); wherein the first positive electrode active material layer (110) comprises a cobalt-containing positive electrode active material; and the second positive electrode active material layer (120) comprises a cobalt-free positive electrode active material. The scheme provided by the application can effectively reduce the side reaction of electrolyte and positive electrode material, improve the structural stability of the positive electrode material of a lithium ion battery, and improve the cycle life and safety performance of the lithium ion battery.