32results about How to "Multiple attachment sites" patented technology

The invention discloses a micron hollow porous composite spherical sodium ion battery cathode material and a preparation method thereof. The cathode material is of a micron-sized hollow porous composite spherical structure, is formed by self-assembling a sheet-shaped structure and a needle-shaped structure, and has a chemical formula of NaxMn1-y-zNiyCozO2, wherein 0<x<=1, 0<=y<=1, 0<=z<=1, and 0<=y+z<=1. The invention also comprises a preparation method of the battery cathode material. The hollow sphere structure of the cathode material shortens the de-intercalation path of sodium ions; the needle-shaped structure provides more attachment sites for sodium ions and is beneficial to preventing agglomeration among particles; the porous structure is beneficial to the contact of the material with a conductive agent and an electrolyte, so that the conductivity of an electrode prepared from the material is improved; the battery positive electrode material is good in structural stability, anda battery assembled by an electrode prepared from the material is good in rate capability; the method is simple in process, required equipment is consistent with an existing industrialized lithium cobalt oxide and nickel-cobalt-manganese ternary cathode material process, and the lithium cobalt oxide and nickel-cobalt-manganese ternary cathode material can be directly produced by an existing production line.

The invention relates to a method and product of in-situ synthetic TiO2@Ti3C2 by using isopropylamine intercalated and layered Ti3C2. The synthetic method comprises the following steps: 1) enabling Ti3AlC2-MAX-phase ceramic powder to be dispersed in HF solution for etching, to obtain Mxene-Ti3C2; 2) enabling the Mxene-Ti3C2 to be dispersed in mixed liquid of isopropylamine and water for performingisopropylamine intercalation, to obtain isopropylamine intercalated Ti3C2; 3) enabling the isopropylamine intercalated Ti3C2 to be dispersed in the water, performing ultrasonic treatment in an argonatmosphere, after drying, to obtain isopropylamine intercalated and layered Ti3C2; and 4) performing in-situ oxidation on the isopropylamine intercalated and layered Ti3C2 in an oxygen condition, to obtain TiO2@Ti3C2. The method is capable of improving an interlayer spacing distance of the Mxene-Ti3C2 by using the isopropylamine and the ultrasonic treatment, providing more attachment sites for thegenerated TiO2, and more advantageously performing catalytic degradation on a pollutant.

The invention relates to a method for in situ synthesis of TiO2@Ti3C2 through the intercalation and layering of hydrazine hydrate and a product. The synthetic method comprises the following steps: (1)dispersing Ti3AlC2-MAX-phase ceramic powder into an HF solution, and etching, so as to obtain Mxene-Ti3C2; (2) dispersing Mxene-Ti3C2 into hydrazine hydrate, carrying out hydrazine hydrate intercalation, so as to obtain hydrazine hydrate intercalated Ti3C2; (3) dispersing hydrazine hydrate intercalated Ti3C2 into water, carrying out ultrasonic treatment in an argon atmosphere, and drying, so as to obtain hydrazine hydrate intercalated and layered Ti3C2; and (4) carrying out in situ oxidation on hydrazine hydrate intercalated and layered Ti3C2, so as to obtain TiO2@Ti3C2. According to the method, the interlayer spacing of Mxene-Ti3C2 is increased through hydrazine hydrate and ultrasonic treatment, so that more attachment sites are provided for generated TiO2, and the catalytic degradationof pollutants is promoted.

The invention belongs to the field of environmental protection, and particularly relates to a honeycomb ceramic/biochar film/rare earth perovskite monolithic catalyst and a preparation method and application thereof. Agricultural and forestry waste biomass is utilized to form a biochar film second carrier layer on the surface of honeycomb ceramic, and perovskite oxide is indirectly coated on a honeycomb ceramic carrier to form the monolithic catalyst; on one hand, the specific surface area of the carrier is favorably increased, and more attachment sites are provided for the active component; on the other hand, the effect of fixing the active components can be achieved, the effect of inhibiting aggregation and grain growth of the active components is facilitated, meanwhile, part of carbon elements are doped into crystal lattices of perovskite, defects are caused, and the low-temperature catalytic oxidation activity of the catalyst is improved. Moreover, the biochar is developed in pore structure, and has a large number of defects and unsaturated bonds on the surface. Oxygen and other heteroatoms are easily adsorbed on the defects to form a plurality of functional groups such as carboxyl, anhydride and carbonyl, so that the catalytic oxidation degradation of VOCs (Volatile Organic Compounds) is promoted.

The invention discloses a preparation method of a self-supporting three-dimensional porous carbon negative electrode material. The preparation method comprises the following steps: dissolving saccharose into an acetone and deionized water mixed solvent to obtain a precursor solution; after mixing a foamed nickel self-supporting body and a precursor, carrying out a hydrothermal reaction, naturallycooling to room temperature, and washing and drying the product; and carrying out heat treatment on the product in an inert atmosphere so as to obtain a final product. A three-dimensional porous carbon material is grown on the surface in an in-situ mode by taking metal foamed nickel as the self-supporting body. In the subsequent heat treatment process, the part connected with metal nickel can be partially graphitized through the catalytic graphitization of metal nickel, so that the electron conductivity is improved. Moreover, the material is of relatively large specific surface area through the three-dimensional porous structure, the material can be in sufficient contact with an electrode material, more attachment sites are provided for sodium ions, and the material is of relatively high capacity. According to the method, the used raw materials are stable in ingredients and wide in resources, the technological operation is simple, the prepared electrode does not need a subsequent coating technology, the capacity loss is reduced, and the method is beneficial for industrial production.

The invention discloses an array type positive electrode current collector for a liquid metal battery. By arranging a columnar array pointing to the direction of a negative electrode at the bottom ofa positive electrode current collector shell, the distribution uniformity of the positive electrode interface of the liquid metal battery is effectively improved, the internal stress of an interface alloy layer is reduced, more attachment sites are provided for the alloy layer, and the short-circuit risk in the operation process of a large-size battery is effectively eliminated, at the same time,the mass transfer process of the battery charging and discharging process can be effectively ensured, and the safe, stable and efficient battery operation is promoted.

The invention discloses a room-temperature NO2 sensor based on a ZnO microsphere and CsPbBr3 quantum dot heterostructure composite material and a preparation method thereof, and belongs to the technical field of semiconductor oxide gas sensors. The sensor is composed of a ceramic chip substrate with a metal interdigital electrode and a ZnO microsphere and CsPbBr3 quantum dot heterostructure composite material sensitive layer coating the metal interdigital electrode. The morphology of zinc oxide is of a sphere structure, has a large specific surface area, and can provide more attachment sites, so that zinc oxide is in full contact with perovskite CsPbBr3 quantum dots with small sizes, and a gas sensitive element with good gas sensitive response and high response recovery speed is obtained. In addition, the CsPbBr3 quantum dots are used as an excellent photoelectric material and can absorb visible light, so that more photon-generated carriers are provided. The sensor provided by the invention adopts a planar structure, and is simple in process, short in manufacturing period and suitable for mass production.

The invention relates to a suspension bed hydrogenation catalyst and a preparation method and application thereof. The method comprises the steps that water-soluble ferrous salt is loaded on a carrier, and then a hydrogen peroxide solution is adopted for oxidation treatment to obtain the catalyst; by adopting hydrogen peroxide for oxidation treatment, compared with a traditional air oxidation method, the time required for preparing the catalyst is shortened by 90-99.5%, the activity of the prepared catalyst is also remarkably improved, the catalyst obtained by means of the method is adopted for a hydrogenation lightweight reaction of heavy coal tar in a 500ml high-pressure reactor, and the conversion rate of the heavy coal tar can reach 81% or more.

The invention belongs to the field of functional materials and photoelectric sensing, a composite material obtained by combining a two-dimensional MXene material and SnS2 is used as a photosensitizer, and the photosensitizer is used for constructing a photoelectric sensor and detecting Cr (VI) in a water body. The MXene/SnS2 functional composite material is prepared by adopting a hydrothermal method, the photoelectrochemical sensor is constructed by utilizing the MXene/SnS2 functional composite material, and the photoelectrochemical sensor is a sensing device which takes a photosensitive material as a basis and converts an optical signal into an electric signal through a signal converter and outputs the electric signal. According to the composite material, attachment sites are provided for the visible-light-responsive SnS2 nanometer material based on MXene with the large specific surface area, the MXene and the SnS2 nanometer material are combined, the accumulation problem of MXene can be avoided, the electron transfer efficiency of the SnS2 material can be improved, the composite material is applied to the field of photoelectric sensors, the concentration of Cr (VI) in wastewater can be sensitively detected, and the application prospect is wide. The sensor also has the advantages of low cost, simple operation and high sensitivity.

The invention discloses a sponge fiber, a preparation method and application, and belongs to the technical field of fibers. The sponge fiber is filamentous, the cross section of the sponge fiber is a net-shaped cross section, the net-shaped cross section comprises a central part and an edge part located on the periphery of the central part, and the average pore diameter of the central part is smaller than that of the edge part. The sponge fiber has a special structure, so that the sponge fiber has excellent performance in the fields of sound insulation materials and thermal insulation materials, and has wide application prospects in the fields of materials in direct contact with a human body and the technical field of biological scaffold materials.

The invention discloses a high-strength wear-resistant closed steel frame and the a machining process thereof. The process includes the steps that during preparation, firstly, an alloy steel pipe fitting is subjected to surface laser cleaning, and a surface oxidation film of the alloy steel pipe fitting is removed by conducting laser cleaning on the surface of the alloy steel pipe fitting, so that the surface wettability of the alloy steel pipe fitting can be improved; in a subsequent laser cladding procedure, cladding liquid can be fully spread out, so that a subsequently-formed wear-resistant layer is more uniform and compact, has few pores and is more excellent in wear resistance; and meanwhile, a rough structure can be formed on the surface of alloy steel after laser cleaning, so that the surface roughness can be improved, the adhesive force of a thick laser cladding layer is further improved, and the comprehensive wear resistance of the alloy steel is improved. The machining process of the high-strength wear-resistant closed steel frame is reasonable in design and easy to operate, the wear-resisting layer is formed on the surface of the prepared alloy steel pipe fitting, a steel frame is obtained through splicing installation, the wear-resisting layer can effectively improve the wear-resisting performance and the comprehensive mechanical performance of the alloy steel frame, and the alloy steel frame can be suitable for multiple technical fields and has high practicability.