103results about "Oxy/sulfo carbides" patented technology

Methods for preparing high entropy carbides (HECs), and powders thereof, are provided. One method includes spray-drying a base carbide feedstock and consolidating. Another method includes cold crucible induction of a base carbide feedstock. The HECs produced are of a quality suitable for use in industry. The methods are scalable in size, and suitable for use on an industrial scale. Also included are HEC feedstocks produced by the methods, and articles, such as coatings, produced from the HECs.

A paste that includes particles of a layered material in an ammonia aqueous solution. The particles include one or plural layers, the layers having a layer body represented by MmXn, wherein M is at least one metal of Group 3, 4, 5, 6, or 7, X is a carbon atom, a nitrogen atom, or a combination thereof, n is not less than 1 and not more than 4, and m is more than n but not more than 5, and a modifier or terminal T exists on a surface of the layer body, wherein T is at least one selected from the group consisting of a hydroxyl group, a fluorine atom, a chlorine atom, an oxygen atom, and a hydrogen atom, wherein the paste has a viscosity of 1 Pa·s or more at a shear velocity of 1 / s when the paste has a solid content concentration of 1.0% by mass.

Embodiments of the present disclosure disclose wave-absorbing materials, device for wave-absorbing and heat-dissipating including the same, and methods of preparing the same. The device for wave-absorbing and heat-dissipating comprises: a wave-absorbing layer, the wave-absorbing layer being prepared from raw materials comprising wave-absorbing material and heat-dissipating material, the wave-absorbing layer in which the wave-absorbing material and the heat-dissipating material are in a first mass ratio; a heat-dissipating layer, the heat-dissipating layer being adjacent to the wave-absorbing layer, the raw material for preparing the heat-dissipating layer comprising wave-absorbing material and heat-dissipating material; the mass ratio of the wave-absorbing material and the heat-dissipating material in the heat-dissipating layer is a second mass ratio; the first mass ratio is greater than the second mass ratio. The solution of the present disclosure is capable of reducing cost and occupying space while safeguarding the wave-absorbing performance and heat-dissipating performance of the device for wave-absorbing and heat-dissipating.

The invention provides a graded porous hard carbon-silicon composite negative electrode material and a preparation method thereof, and belongs to the technical field of new energy battery electrode materials. The preparation method comprises the following steps: mixing pitch-based soft carbon and potassium hydroxide, performing ball milling, performing heating activation in a nitrogen atmosphere, performing cooling, performing washing with hydrochloric acid until the mixture is neutral, and performing vacuum drying to obtain a product A; dispersing the product A in absolute ethyl alcohol, adding polyether diamine and a silane coupling agent (KH560), dropwise adding a triethylamine solution, heating, stirring, performing reflux reaction, and centrifuging and collecting a product B after the reaction is completed; heating and curing the product B in vacuum to obtain a product C; dispersing the product C in water, adding phenol, carrying out ultrasonic dispersion, adjusting the pH value to 8.5-9, then dropwise adding a formaldehyde solution, carrying out a stirring reaction, and after the reaction is finished, carrying out centrifugation and drying to obtain a product D; and carbonizing the product D under the protection of argon to obtain the graded porous hard carbon-silicon composite negative electrode material. According to the graded porous hard carbon-silicon composite negative electrode material, soft carbon and hard carbon are utilized to construct a graded porous structure.

The invention discloses an MXene-coated PZS-C gel structure membrane electrode as well as a preparation method and application thereof, and belongs to the technical field of electrochemical uranium removal. Carrying out etching stripping or etching intercalation stripping on the MAX powder to form an MXene nanosheet suspension; the preparation method comprises the following steps: dissolving phosphonitrilic chloride trimer and 4, 4-dihydroxy diphenyl sulfone, adding triethylamine, and carrying out condensation reaction under the ultrasonic action to obtain microspherical PZS; the preparation method comprises the following steps: stirring and mixing an MXene nanosheet suspension and microspherical PZS, depositing the mixture on a substrate in a vacuum-assisted filtration manner to form a membrane body, and carrying out vacuum freeze drying and calcination on the membrane body to obtain the MXene-coated PZS-C gel structure membrane electrode which has good stability, fully exposes active sites, is used for electrochemical separation of uranyl ions, and has a good application prospect in electrochemical separation of uranyl ions. The maximum removal amount of the material reaches up to 3375.44 mg / g and is generally higher than that of other electrochemical uranium removal materials, and the material has a good application prospect.

The invention discloses a silicon-oxygen-carbon-based negative electrode material and a preparation method thereof, and belongs to the technical field of lithium battery negative electrode materials, and the preparation method comprises the following steps: (1) mixing alcohol, water and acid to prepare an acid solution with the pH value of 2-4, adding organosiloxane into the acid solution, and stirring in a water bath to obtain a siloxane hydrolysate; (2) adding a pyrene compound into the siloxane hydrolysate, and carrying out ultrasonic treatment; (3) adding alkali, stirring in a water bath at 20-50 DEG C for 1-3 hours, and then freeze-drying to obtain a precursor of SiOC; and (4) placing the precursor in an atmosphere furnace, sintering in an argon atmosphere, and naturally cooling to obtain the modified negative electrode material SiOC. The amorphous carbon content of the prepared SiOC is increased, on one hand, the electronic conductivity of the SiOC can be improved, and on the other hand, volume expansion in the charging and discharging process can be relieved.

Provided is a method for manufacturing a filled acyl fluoride container in which the purity of the filled acyl fluoride is less likely to decrease. This method for manufacturing an acyl fluoride-filled container is a method for manufacturing an acyl fluoride-filled container in which the container is filled with acyl fluoride, at least the inner surface of the container being formed from a metal material, and the surface roughness Rz of the inner surface being 0.01 [mu] m to 10 [mu] m (inclusive). Furthermore, the method comprises: a treatment step in which a treatment gas containing a treatment acyl fluoride for treating the inner surface is introduced into the container, and the treatment acyl fluoride is brought into contact with the inner surface at a temperature of 160 DEG C or less; in the extraction step, the processing gas introduced into the container in the processing step is extracted from the container, and in the filling step, the container after the extraction step is filled with the acyl fluoride to be stored in the container.

The present invention discloses a MXene two-dimensional material and a preparation method and application thereof, wherein the chemical formula of the MXene two-dimensional material is expressed as M n+1 (X a Y 1‑a ) n , where M is selected from a transition metal element, X is selected from one or more of carbon, nitrogen, and boron, and Y is selected from one or more of phosphorus, oxygen, sulfur, selenium, or tellurium; 0<a<1, and n is between 1 and 4. The preparation method of this two-dimensional MXene material comprises reacting a MXene material containing a halogen element functional group with a single element, hydride, or metal salt of phosphorus, oxygen, sulfur, selenium, or tellurium. This invention produces a novel MXene material that achieves the doping of non-metallic elements at the X position, providing a new approach to multi-element manipulation of MXene materials.

A novel composite material for a secondary lithium battery, a preparation method therefor and an application thereof. The novel composite material comprises: nano-silicon and carbon atoms. The carbon atoms are uniformly distributed in the nano-silicon at an atomic level; the carbon atoms and silicon atoms are combined to form an amorphous Si-C bond, and no SiC crystal peak exists in an X-ray diffraction (XRD) energy spectrum; in solid nuclear magnetic resonance (NMR) detection of the novel composite material, a 29SiNMR chart shows that, when the silicon peak is between -70 ppm and -130 ppm, there is a Si-C resonance peak between 20 ppm and -20 ppm; the area ratio of the Si-C resonance peak to the silicon peak is (0.1, 5.0); the average particle size D50 of the novel composite material is 1 nm-50 ¡lm; the mass of the carbon atoms accounts for 0.5%-50% of the mass of the novel composite material.

[Object] To provide a secondary battery material that is used in a lithium ion battery, a negative electrode active material including the secondary battery material, and a secondary battery including the negative electrode active material. The secondary battery material gives a secondary battery having high charge and discharge capacity, initial efficiency, and capacity retention rate as a whole and having an excellent balance of these characteristics. [Solution] A secondary battery material contains Si (silicon), O (oxygen), and C (carbon), and the content ratio x of O to Si satisfies 0.1 ≤ x ≤ 2, and the content ratio y of C to Si satisfies 0.3 ≤ y ≤ 11.

The invention belongs to the technical field of ceramic microspheres, and particularly relates to porous and multi-cavity SiCO ceramic wave-absorbing microspheres and a preparation method thereof. The preparation method comprises the following steps: (1) under a stirring condition, dropwise adding a liquid cavity forming agent into a liquid ceramic precursor for primary emulsification to obtain a primary emulsion; (2) adding the primary emulsion into the continuous phase, and stirring for secondary emulsification to obtain a multiple emulsion; (3) thermally curing the multiple emulsion, mixing with a solvent, centrifugally separating, and drying to obtain hollow resin microspheres; and (4) sintering the hollow resin microspheres in a protective atmosphere to obtain the porous and multi-cavity SiCO ceramic wave-absorbing microspheres. The prepared porous and multi-cavity SiCO ceramic wave-absorbing microspheres have regular spherical morphology, dense nano-scale pores are distributed on the surface, a large number of micron-scale cavities exist in the microspheres, the pore diameter and the cavity structure are adjustable, and the wave-absorbing performance is good.

A structure can comprise one or multi-element compound (MEC) nanoparticles. Each MEC nanoparticle can have a plurality of sites comprising one or more elements. Each site can form a compound bond with at least one other site of the MEC nanoparticle. One or more of the compound bonds can comprise a covalent bond, an ionic bond, or a metallic bond. Each MEC nanoparticle can be formed of at least three different elements. For example, one or more MEC nanoparticles can be a multi-element oxide nanoparticle, a multi-element carbide nanoparticle, a multi-element intermetallic nanoparticle, or any other type of compound nanoparticle.

To provide a novel Schottky barrier diode in which MXene is used.SOLUTION: There is provided a Schottky barrier diode in which a semiconductor portion and a conductive portion are bonded. The semiconductor portion comprises an oxide semiconductor, and has surface roughens of 10 nm or less on a surface bonded to the conductive portion. The conductive portion comprises particles of a layered material that includes one or more layers, and the layers each include: a layer body represented by a formula MmXn (in the formula, M is at least one kind of group 3-7 metals, X is a carbon atom, a nitrogen atom or a combination thereof, n is 1 or more and 4 or less, and m is more than n and 5 or less); and a modification or a terminal T (T is at least one kind selected from a group consisting of a hydroxyl group, a fluorine atom, a chlorine atom, an oxygen atom, and a hydrogen atom) present on a surface of the layer body. A distance between the two layers adjacent to each other in the conductive portion is 1.10 nm or more in the Schottky barrier diode.SELECTED DRAWING: Figure 1

The application relates to a synthesis and preparation method of a doped SiOC microsphere reinforced aerogel composite material, which comprises the following steps: SiOC microsphere preparation and SiOC microsphere and aerogel compounding. Tetraethyl orthosilicate, phenyltrimethoxysilane and dimethyldimethoxysilane are used as precursors, hydrochloric acid and ammonia are used as catalysts for polymerization, and high-temperature calcination is carried out in a muffle furnace to obtain SiOC microspheres; methyltrimethoxysilane, dimethyldimethoxysilane, hydrochloric acid, CTAB and urea are added to the SiOC microsphere system under ultrasonic dispersion, and stirring is carried out to obtain a wet gel; a normal-pressure drying process is used for drying, and finally, the SiOC microsphere doped aerogel composite material is obtained. The raw materials such as tetraethyl orthosilicate and phenyltrimethoxysilane used in the application have simple sources, low prices and are green and environment-friendly; the SiOC microspheres have good compatibility with the aerogel matrix, can effectively avoid defects generated in the aerogel due to the compounding of the SiOC microspheres and the aerogel, and can effectively enhance the mechanical properties. The normal-pressure drying operation is simple and safe, and the obtained aerogel composite material has low density, good hydrophobicity and low thermal conductivity.

The present invention provides low-oxygen vanadium aluminum carbide (V2AlC) MAX for producing high-purity vanadium MXene, and a manufacturing method therefor.

The invention discloses an MXene-derived non-Van der Waals artificial solid-phase material and a preparation method and application thereof, an electrode and a battery, and the preparation method comprises the following steps: mixing sulfur-terminated MXene, metal powder and eutectic molten salt, carrying out a first heating reaction, intercalating metal atoms between sulfur-terminated MXene layers, and carrying out a second heating reaction, so as to obtain the MXene-derived non-Van der Waals artificial solid-phase material. Chemical bonding is formed between the metal atoms and sulfur end groups, and the non-Van der Waals artificial solid-phase material is obtained; wherein the metal powder is selected from one or more of copper powder, iron powder, cobalt powder and nickel powder. According to the preparation method, spontaneous intercalation of transition metal atoms (Cu, Fe, Co and Ni) is driven by utilizing vulcanization configuration MXene, so that a novel MXene derivative material is obtained, and the MXene derivative material has a unique chemical bonding structure.

The present application relates to a composite current collector (10). [Solution] The composite current collector (10) includes: a base layer (1) having a first surface (11) and a second surface (12) arranged back to back along the thickness direction, the base layer (1) being made of a polymer material; a first modified layer (3) arranged on the first surface (11) of the base layer (1), the first modified layer (3) being made of one or more of silicon carbide oxide, titanium carbide oxide, and aluminum carbide oxide nanomaterials; and a first metal layer (2) arranged on the surface of the first modified layer (3) facing away from the base layer (1).

The invention belongs to the technical field of electromagnetic wave-absorbing materials, and relates to a three-dimensional composite wave-absorbing material with Fe3O4 (at) C uniformly distributed on an MXene substrate, the material is of a three-dimensional network structure, the three-dimensional network structure forms a skeleton by carbon nanofibers, the skeleton is coated with MXene, and Fe3O4 is dispersed and distributed in the three-dimensional network structure; the preparation method comprises the following steps: adding LiF and MAX into an acid solution for etching, then washing, ultrasonically stripping and centrifuging to obtain single-layer MXene, preparing Fe3O4 microspheres by a hydrothermal method, adding the Fe3O4 microspheres and PAN into a DMF (Dimethyl Formamide) solution, uniformly dispersing, then carrying out electrostatic spinning, carbonizing in an argon atmosphere, adding a surface-modified spinning felt into the single-layer MXene solution, and drying to obtain the product, a low-dimensional multi-stage coupled magnetic network and conductive network structure is formed, and meanwhile, the structure brings a large number of cavities and heterogeneous interfaces, so that incident electromagnetic waves can be reflected for multiple times in the material, and the electromagnetic wave absorption capacity is greatly improved.

A MAX phase has a layered structure of M(n+1)AXn including a plurality of transition metal layers (where n is a natural number, and n and n+1 represent a number of layers). M includes at least two transition metal elements. X includes nitrogen or carbon. A includes at least a first element and a second element, which are different from each other and selected from a Group 13 element, a Group 14 element, a Group 15 element, and a Group 16 element. A difference in atomic radii of the first element and the second element is greater than or equal to 0.1 Å. A first transition metal layer and a second transition metal layer corresponding to opposite outer layers among the transition metal layers have different compositions so that the MAX phase and a MXene obtained from the MAX phase have an asymmetrical out-of-plane-ordered structure.

The application discloses a preparation method of a room-temperature liquid-phase plasma constructed covalent interface silicon-based negative electrode material. x The MXene colloidal suspension mixture is subjected to plasma treatment to obtain a plasma modified suspension; S2, the plasma modified suspension is subjected to suction filtration and then annealing treatment to obtain the covalent interface silicon-based negative electrode material Si@TiO2@MXene. The application also discloses the covalent interface silicon-based negative electrode material Si@TiO2@MXene obtained by the above preparation method and application of the covalent interface silicon-based negative electrode material Si@TiO2@MXene in a lithium ion battery negative electrode and a lithium ion battery. The application realizes in-situ TiO2 interlayer growth on a silicon surface and Si-O-Ti covalent interface bonding through room-temperature liquid-phase plasma in one step, constructs a hierarchical double-constraint structure, and realizes the super-long cycle life and excellent rate performance of the silicon-based negative electrode in the lithium ion battery under high silicon content.

This application relates to a heating furnace for carbon disulfide production, belonging to the technical field of carbon disulfide production. It includes: a furnace body, including an outer furnace box body, an inner furnace box body and support pipes; a sulfur supply assembly, including a combustion chamber, a liquid sulfur pipe and a nozzle; a methane supply assembly, including a methane gas pipe, a transfer piece, a connecting pipe and a mixing plate; a mixing assembly, including a rotating blade, a driving fan blade, a bevel gear ring, a bevel gear and a guiding fan blade; an exhaust assembly, including a first discharge pipe, a second discharge pipe, a third discharge pipe and a fourth discharge pipe; by uniformly introducing gaseous sulfur and methane gas into the inner furnace box body and stirring and turning the gaseous sulfur and methane gas through the mixing plate, the sulfur and methane are easily mixed evenly, which can increase the output of carbon disulfide and is conducive to the efficient production of carbon disulfide. This application has the effect of improving the mixing degree of sulfur and methane.

The application belongs to the technical field of membrane separation, and discloses a Ti3C2T x MXene quantum dot composite polyamide reverse osmosis membrane preparation method, first, Ti3C2T x MXene material is subjected to liquid nitrogen intercalation treatment and interlayer expansion, and Ti3C2T x MXene quantum dot nanomaterial; then, Ti3C2T x MXene quantum dot nanomaterial is prepared; the polyamine aqueous solution and the polyacyl chloride solution; the ultrafiltration base film is soaked in the water-phase monomer solution, the water-phase monomer solution on the film surface is blown dry; then, the base film is immersed into the organic-phase solution, interface polymerization reaction occurs, and an active layer is formed; the composite film after interface polymerization is placed and subjected to heating treatment, and interface polymerization reaction is further promoted to occur. The preparation process is simple, the prepared reverse osmosis membrane has good membrane performance, that is, has higher water flux and better anti-pollution performance.

The invention belongs to the technical field of two-dimensional material preparation, and particularly relates to a method for directly synthesizing an Nb < x > Ta < 2-x > S2C material through a catalytic method. According to the method, niobium powder, tantalum powder, sulfur powder and carbon powder are used as raw materials and sealed in an ampoule bottle to isolate air, and a halogen compound or a halogen simple substance is used as a catalyst to directly synthesize NbxTa (2-x) S2C at high temperature. According to the method, Nb < x > Ta < 2-x > S2C is directly synthesized by heating in an ampoule bottle without air, so that the process flow is simplified, the preparation temperature is reduced, the reaction time is shortened, the use of organic solvents such as acetonitrile is avoided, and the material preparation cost is reduced. Therefore, the method belongs to the Nb < x > Ta < 2-x > S2C preparation method which is low in cost, simple in process, safer and more reliable, and can be widely applied to the fields of energy storage batteries, electromagnetic interference shielding, catalysis and plasma metamaterials.

A conductive two-dimensional particle-containing composition including: a conductive two-dimensional particle of a layered material including one or a plurality of layers; a dispersion medium having a relative permittivity greater than that of water; and a fluorine element and an oxygen element on a surface of the conductive two-dimensional particle, wherein the one or plurality of layers includes a layer body represented by: MmXn, wherein M is at least one metal of Group 3, 4, 5, 6, or 7, X is a carbon atom, a nitrogen atom, or a combination thereof, n is 1 to 4, and m is more than n and 5 or less, and a modifier or terminal T existing on a surface of the layer body, wherein T is at least one selected from the group consisting of a hydroxyl group, a fluorine atom, a chlorine atom, an oxygen atom, and a hydrogen atom.

The invention belongs to the technical field of ternary transition metal carbide materials, and particularly relates to a semiconductor type layered ternary transition metal carbide and a preparation method and application thereof. The chemical formula of the ternary transition metal carbide is M2SC, wherein the transition metal M is Y or Sc; the ternary transition metal carbide has an Rm type crystal structure. Comprising the following steps: by taking scandium powder or yttrium powder, sublimed sulfur and graphite powder as raw materials, sintering twice to obtain the semiconductor type layered ternary transition metal carbide. The MAX phase with semiconductor properties is obtained based on different valence states of sulfur for accurately adjusting the property of the MAX phase, the chemical formula of the semiconductor type ternary transition metal carbide is Y2SC and Sc2SC, the semiconductor type ternary transition metal carbide has an Rm type crystal structure, the existing MAX phase system is expanded by the material, and the application of the MAX phase material in the field of functional materials such as energy conversion and electronic materials is greatly expanded.

The invention discloses a preparation method and application of a multifunctional spongy N-doped MXene-coated AgMFs composite material, and belongs to the technical field of electromagnetic shielding materials. Two-dimensional transition metal carbide MXene and industrial-grade silver microchips AgMFs are driven by a solvent to complete interface self-assembly, a composite film is obtained in a vacuum-assisted filtering mode, and then the spongy N-doped MXene-coated AgMFs composite material is prepared through hydrazine hydrate treatment. The composite material prepared by the invention can ensure extremely high electromagnetic shielding effectiveness (79.1 dB, 8-12 GHz) of the material under the conditions of extremely thinness (86 microns) and extremely low density, and meanwhile, the shielding behavior is mainly dominated by absorption, so that the situation that electromagnetic pollution in a module is caused by over-strong reflection performance of most of current high-conductivity materials is avoided.

The application relates to the technical field of aerogel preparation, in particular to a SiOC aerogel preparation method. The method comprises the following steps: sequentially dissolving tetraalkoxysilane and alkyltrialkoxysilane in a mixed solvent of deionized water and ethanol, and adjusting the pH value to 1-4; adding a catalyst (hexamethylenetetramine) and a dry control agent (N,N-dimethylformamide) into the mixed solution, and then respectively performing an aging reaction and solvent replacement; finally, obtaining a polysiloxane precursor aerogel through normal-pressure drying; placing the polysiloxane precursor aerogel in a pyrolysis furnace for high-temperature treatment to obtain SiOC aerogel doped with free carbon; and placing the SiOC aerogel in a muffle furnace for high-temperature calcination to remove the free carbon. The SiOC aerogel preparation method aims to solve the problems of complex process and low efficiency in the preparation of SiOC aerogel through normal-pressure drying, and realizes the purposes of efficient controllability, low cost and facilitation of industrial production in the SiOC aerogel preparation process.

A porous silicon oxycarbide composite material comprising porous silicon oxycarbide having a three-dimensional skeleton structure and a carbonaceous material retained by the three-dimensional skeleton structure, wherein the BET specific surface area is 100 m 2 / g or more, and the conductivity is 1.0×10 ‑6 S / cm or more.

The invention belongs to the field of water-based zinc ion battery electrode materials based on carbides, and discloses a carbon-coated manganese-cobalt-carbon composite material and application thereof in a water-based zinc ion battery, and a preparation method of the composite material comprises the following steps: carrying out double decomposition reaction on manganese salt and cobalt potassium cyanide to generate a cobalt manganese cyanide Mn3 [Co (CN) 6] 2 precursor; and calcining and carbonizing the precursor to obtain the carbon-coated manganese-cobalt-carbon composite material which is formed by coating a carbon layer on the surface of a compound of Mn2Co2C and Mn5C2. The preparation method is simple, and the obtained composite material not only can stabilize the structure of a manganese-based electrode material and inhibit manganese dissolution, but also can improve the conductivity of the material, thereby improving the rate capability and cycle stability of the aqueous zinc ion battery.