164 results about "Phosphide" patented technology

The invention discloses a fireproof coated pipe as well as a preparation method and application thereof, and relates to the field of organic composite materials. The fireproof coated pipe comprises a mother blank material and a liquid waterproof agent, wherein the mother blank material comprises a flame-retardant polymer matrix, coated graphite and a heat-conducting filler; the coated graphite is formed by expanded graphite and a coating layer on the surface, and the coating layer comprises a silicon source and a phosphorus source. The surface of the expanded graphite is coated with the silicon dioxide-phosphide composite material, so that the compatibility of the filler and a specific type of flame-retardant polymer matrix can be improved, the addition amount of the heat-conducting filler is reduced to ensure uniform dispersion, and synergistic multiplication of a flame-retardant function and optimization of a heat-conducting network are realized; meanwhile, a specific type of liquid waterproof agent is introduced and is extruded and blended with the master batch, so that the material is endowed with excellent waterproofness, meanwhile, the compatibility with other core properties is ensured, the waterproof coated pipe material with efficient heat conduction, flame retardance, waterproofness and mechanical strength is provided, and the application field is expanded.

The invention belongs to the technical field of electro-catalysis water decomposition, and relates to a self-supporting W-NiCoP / NF composite material and a preparation method and application thereof. Cobalt salt, terephthalic acid, acetic acid and foamed nickel are subjected to a first solvothermal reaction, and defect type Co-MOF / NF is obtained; immersing the defect type Co-MOF / NF into a tungstate solution, and then carrying out a second solvothermal reaction to obtain a defect type W-Co-MOF / NF precursor; and carrying out phosphating heat treatment on the defect type W-Co-MOF / NF precursor and a phosphorus source in an inert atmosphere to obtain the W-Co-MOF / NF composite material. According to the preparation method disclosed by the invention, the tungsten-doped nickel-cobalt bimetallic phosphide with rich defect structures is successfully constructed on the foamed nickel substrate through a step-by-step solvothermal and gas-phase phosphating strategy, so that organic combination of a bimetallic synergistic effect and defect engineering is realized; the prepared self-supporting composite material has more active sites, a better electronic structure regulation effect and better stability.

The application discloses a kind of based on MXene / bimetallic phosphide / multi-polyphenol polymer multilevel flame-retardant photothermal material and preparation method, the material with nanosheet as base, by in-situ construction precursor and form bimetallic cobalt-nickel phosphide structure through phosphorization reaction, subsequently introduce tannic acid and dopamine on its surface, in-situ copolymerization is formed with the characteristics of multi-polyphenol photothermal layer of imitation mussel, to construct MXene / bimetallic phosphide / multi-polyphenol layer multilevel composite structure.The prepared photothermal material described in the application has excellent flame-retardant performance and photothermal conversion performance, can promote the formation of dense carbon layer during combustion, effectively inhibit heat release, smoke generation and toxic gas release;Under light condition, it can realize efficient photo-thermal conversion, and is used for preventing and removing ice in low-temperature environment.Adding the material as flame retardant to thermoplastic polyurethane can significantly improve the limiting oxygen index of the composite material and reduce the peak heat release rate.

This invention discloses a transition metal phosphide catalyst, its preparation method, and its application, belonging to the field of electrocatalysis technology. The process includes: firstly, dissolving nickel salt, lanthanum salt, urea, and ammonium fluoride in deionized water to synthesize a nickel-lanthanum layered hydroxide nanosheet precursor via a hydrothermal method; secondly, preparing a lanthanum-doped nickel phosphide catalyst using a phosphating reaction; and thirdly, utilizing a lanthanum doping strategy to modulate the electronic structure of nickel phosphide and improve its electrocatalytic reaction performance. This lanthanum-doped nickel phosphide material exhibits good catalytic activity when used to catalyze hydrogen evolution and sulfide ion oxidation reactions. In an integrated two-electrode electrolyzer for sulfide ion oxidation-assisted hydrogen production, it outputs 10 mA cm⁻¹. ‑2 This invention achieves the goal of producing hydrogen and high-value-added sulfur products with low energy consumption by requiring a relatively low voltage of 0.525 V at a current density. It has advantages such as simple preparation process, controllable operating conditions, and low raw material costs, possessing the potential for large-scale production and serving as a high-performance catalyst for electrocatalytic hydrogen production and sulfur ion oxidation reactions.

A catalytic electrode includes a nickel-based porous base material, and a plurality of catalytic alloy balls of nickel and another metal doped with elements, in which the another metal includes iron, the elements include C, F, and S, and the catalytic alloy balls are dispersed on the surface of the nickel-based porous base material. The catalytic electrode also includes a plurality of metal phosphide particles covering the nickel-based porous base material and the catalytic alloy balls, and the metal phosphide particle includes nickel phosphide, nickel iron phosphide, nickel cobalt phosphide, nickel copper phosphide, or nickel zinc phosphide.

The application discloses a kind of foam nickel load iron nickel bimetallic phosphide heterojunction catalyst and its preparation method and application, belong to electrocatalytic material technical field.The application is in situ grown by hydrothermal deposition in combination with low-temperature phosphorization process, and is prepared on foam nickel base Phosphide iron / Phosphide nickel heterojunction catalyst (Fe2P / Ni2P@NF).The prepared catalyst shows excellent performance in the electrocatalytic reduction of nitrate synthesis ammonia and high nitrate wastewater degradation.The preparation process of the catalyst of the application is simple, low in cost, and little to environmental pollution, and the self-supporting electrode prepared by integration can be directly applied to proton exchange membrane electrolytic cell, and has wide application prospect.

The application provides a titanium alloy surface antibacterial material and a preparation method and application thereof, and comprises a metal phosphide coating constructed on a titanium alloy substrate surface through a plasma immersion injection process and a chemical vapor treatment process and application of the metal phosphide coating in antibacterial medical materials. The coating of the technical scheme has good sterilization function and biocompatibility.

A method of forming a metal phosphide film on a substrate using a cyclical deposition process includes contacting the substrate with a vapor-phase metal precursor, contacting the substrate with a vapor-phase halogenating agent, and contacting the substrate with a vapor-phase phosphorus-containing precursor. A method of filling a gap includes placing a substrate in a reaction chamber, wherein the substrate comprises a gap; forming a flowable metal halide on the substrate to fill the gap; and converting the flowable metal halide into a metal phosphide.

The application belongs to the technical field of new energy materials and electrochemical catalysis, and provides an oxygen vacancy-rich nitrogen-doped nickel phosphide / cerium oxide composite catalyst, a preparation method and application thereof. A foam nickel is used as a working electrode, a platinum sheet is used as a counter electrode, and a Hg / HgO electrode is used as a reference electrode. In an electrolyte solution containing a nickel salt and a cerium salt, electrodeposition is performed to obtain a precursor. The precursor includes the foam nickel and cerium and nickel deposited on the foam nickel. The precursor is soaked in a tannic acid solution to obtain an impregnated precursor. Ammonium hypophosphite is placed upstream, and the impregnated precursor placed downstream is subjected to phosphorus nitride doping treatment to obtain the oxygen vacancy-rich nitrogen-doped nickel phosphide / cerium oxide composite catalyst. The obtained oxygen vacancy-rich nitrogen-doped nickel phosphide / cerium oxide composite catalyst exhibits excellent electrocatalytic performance for methanol oxidation reaction (MOR) and can be used as a high-efficiency anode catalyst for a direct methanol fuel cell (DMFC).

To provide tin phosphide with reduced ignition properties. [Solution] The tin phosphide is such that when 3 mL of tin phosphide is placed on an insulating plate and a cerium-iron spark is applied to the tin phosphide 1 to 50 times from a distance of 5 mm, no ignition is observed, the ratio of tin to phosphorus (Sn / P by weight) is 8.4 to 13.3, and it substantially does not contain elemental phosphorus and / or phosphorus-rich tin phosphide.

The invention discloses a preparation method of a nickel phosphide foam net with high mechanical stability and application of the nickel phosphide foam net in water electrolysis for hydrogen production. The preparation method comprises the following steps: loading raw materials; cleaning the atmosphere and introducing protective gas; calcining to obtain a nickel phosphide foam net with high mechanical stability; and assembling the water electrolysis hydrogen production device. According to the preparation method, the cost and time in the preparation process are reduced by reducing the calcination temperature and shortening the calcination time, nickel phosphide is formed on the surface of the foam net, meanwhile, metal nickel in the foam net is reserved, and the nickel phosphide foam net shows high catalytic activity and high mechanical stability; compared with the prior art, the method has obvious technical advantages.

The application discloses high-entropy metal phosphide nanowires and a preparation method and application thereof. The preparation method comprises the following steps: high-temperature treatment is performed on carbon nanotubes, the high-temperature treated carbon nanotubes and metal chlorides are mixed and ball milled to obtain a mixture, the metal chlorides comprise chlorides of more than five metal elements; in a protective atmosphere, the mixture is placed in a reaction chamber, heated to perform a first reaction, and then cooled; a phosphorus source and a product obtained in the first reaction are respectively placed in different areas of the reaction chamber, heated to perform a second reaction, and high-entropy metal phosphide nanowires are prepared. The preparation method of the high-entropy metal phosphide nanowires provided by the application utilizes carbon nanotubes as a template to construct, fills multiple chlorides, and then reacts with a phosphorus source under high-temperature conditions to obtain one-dimensional high-entropy metal phosphide, and the prepared high-entropy metal phosphide nanowires can be used as an electrocatalyst with excellent activity and stability, applied to electrocatalytic water splitting, and has a wide prospect.

The application discloses a high-thermal-stability high-nickel ternary material, a preparation method and application. The application utilizes the characteristic that the high-nickel ternary material is sensitive to water, reconstructs a layer of NiOOH on the surface of the high-nickel ternary material, changes the NiOOH coating layer into various transition metal oxyhydroxides by means of an ion exchange reaction, constructs a layer of phosphide on the surface of the transition metal oxyhydroxide through a phosphorization reaction, finally, decomposes the various transition metal oxyhydroxides into high-entropy oxides by means of high-temperature calcination, and then obtains a high-nickel ternary material coated with double layers; the high-entropy oxides have high thermal stability and lithium ion conductivity. In-situ construction of the high-entropy oxide coating layer can not only improve the thermal stability of the high-nickel material, but also help to improve the rate performance and cycle performance of the high-nickel ternary material. The phosphide has strong conductivity, and in-situ coating of the phosphide on the surface of the high-entropy oxide can form a complementary advantage with the high-entropy oxide, and further improve the rate performance of the high-nickel ternary material.

This invention relates to the field of lithium-ion battery technology, specifically to a composite electrode material and its preparation method. The preparation method includes the following steps: using tin, red phosphorus, and lithium salt in a molar ratio of 3.5–3.9:3:0.5–0.1 as raw materials, ball milling is performed in an inert gas to obtain lithium-doped tin phosphide material; the lithium-doped tin phosphide material and carbon nanotube material are mixed uniformly, and calcined under a protective atmosphere to construct a carbon conductive network on the surface of the lithium-doped tin phosphide material to obtain modified tin phosphide material; the modified tin phosphide material is mixed uniformly with additives to obtain the composite electrode material. This invention achieves multi-dimensional modification of tin phosphide anode material through stepwise synergistic processing, solving the technical problem of decreased electrochemical performance of existing tin phosphide anode materials due to volume expansion and lithium loss.

This invention discloses a method for preparing a metal phosphide catalyst. The method involves uniformly mixing a carbon-containing precursor with a phosphorus-containing precursor solution and then drying the mixture to obtain a solid product. The solid product is then pyrolyzed under an inert atmosphere. The pyrolyzed solid product is washed and dried to obtain a phosphorus-doped carbon material. A metal salt solution is then uniformly mixed with the obtained phosphorus-doped carbon material, dried, and reduced under a hydrogen-containing gas atmosphere to obtain the metal phosphide catalyst. Thus, this invention prepares phosphorus-doped porous carbon through the pyrolysis of a carbon precursor and a phosphorus-containing precursor. This utilizes the binding effect of phosphorus functional groups with metal ions to inhibit the migration and aggregation of metal particles under high-temperature conditions, effectively preventing metal particle sintering and improving the yield of the target catalytic product.

The application discloses a kind of nano high-entropy phosphide / carbon composite material and preparation method thereof, comprising the following operating steps: (1) phosphorus-containing resin is soaked into acid solution to adjust the pH of phosphorus-containing resin, and is crushed after drying;(2) water is added to stir thoroughly, to obtain a mixture, Fe salt, Co salt, Ni salt, Cu salt and Mo salt solution are mixed uniformly and then added to the mixture, denoted as M + Resin;(3) enter alkaline substance grinding, heat treatment, after reaction is finished, to obtain nano high-entropy phosphide / carbon composite material.The method of the application uses phosphorus-containing resin as raw material, and the used resin is green and environmentally friendly, low in price, low in raw material and preparation cost;The method of the application is simple in operation, and the particle size of the prepared nano high-entropy phosphide / carbon composite material reaches nanoscale, and the particle size is controllable.

A method of forming a metal phosphide film on a substrate using a cyclic deposition process includes contacting the substrate with a gas phase metal precursor, contacting the substrate with a gas phase halogenating agent, and contacting the substrate with a gas phase phosphorus-containing precursor. A method of filling a gap includes placing a substrate in a reaction chamber, wherein the substrate includes a gap; forming a flowable metal halide on the substrate to fill the gap; and converting the flowable metal halide to a metal phosphide.

The invention relates to the technical field of batteries, in particular to a lithium iron phosphate positive electrode material, a preparation method thereof, a positive plate and a battery. The lithium iron phosphate positive electrode material provided by the invention comprises a doped lithium iron phosphate inner core, and doped elements in the doped lithium iron phosphate inner core comprise one or more of alkaline earth metal, transition metal or non-metallic elements; the first coating layer is coated on at least part of the surface of the doped lithium iron phosphate inner core, and the first coating layer comprises a niobium phosphide coating layer; the second coating layer is coated on at least part of the surface of the first coating layer, and the second coating layer comprises a carbon coating layer. According to the invention, the problem that the compaction density and the low-temperature performance of the lithium iron phosphate positive electrode material are difficult to consider at present can be relieved, and the purpose of considering the compaction density and the low-temperature performance of the high-compaction lithium iron phosphate material can be achieved.

High lattice thermal conductivity metallic materials for thermal management applications are disclosed. The metallic materials have a lattice thermal conductivity of above 100 W / mK. Examples of such metallic materials include tantalum phosphide (TaP) and manganese vanadium (MnV). These materials with high lattice thermal conductivity may be used in various applications to efficiently transfer heat. For example, they may be used in heat dissipation devices as well as in a thermally conductive unit of a device that also includes a heat generating unit. In an implementation, these materials may be used at interfaces between metallic and semiconductor or insulator materials.

The application relates to a nitrite reductase electrode and a preparation method thereof and an electrochemical system. The nitrite reductase electrode comprises a substrate layer and n electron transfer layers and n enzyme activity layers in the form of alternating layers above the substrate layer, n is in the range of 2-30, wherein the substrate layer comprises a carbon-based electrode loaded with a transition metal phosphide, and the enzyme activity layer comprises a nitrite reductase. The nitrite reductase electrode has low detection limit, high sensitivity, high enzyme loading rate, high electrocatalytic efficiency and good application prospect.

The application belongs to the technical field of two-dimensional material preparation, and discloses a preparation method of two-dimensional tin phosphide material. In view of the problems of complex equipment, high cost and strong interface coupling existing in the preparation of two-dimensional SnP3 by using the existing molecular beam epitaxy method, the SnBi / Si (111) substrate with lamellar eutectic structure is prepared by Van der Waals extrusion, and the substrate has the functions of weak coupling interface and self-supply Sn source; the controllable epitaxial growth of two-dimensional SnP3 is realized under the condition of low-temperature chemical vapor deposition at 100 DEG C to 150 DEG C by taking black phosphorus as a phosphorus source. The application has simple process and mild conditions, and can obtain large-area and high-quality two-dimensional SnP3, and is suitable for the fields of optoelectronic devices and integrated circuits.

This invention relates to the preparation and application of silicon-carbon anode materials, and discloses a silicon-carbon anode material modified with lithium phosphide nanoparticles, its preparation method, and a secondary battery. The material has a core-shell structure, with the core comprising porous carbon and lithium phosphide nanoparticles and silicon nanoparticles generated in situ within the micropores of the porous carbon; the shell comprises a composite coating layer composed of amorphous carbon and carbon nanotubes; silicon accounts for 45-65 wt% of the modified silicon-carbon anode material by mass, and the P / Si molar ratio of the lithium phosphide nanoparticles to the silicon nanoparticles is 2:98~30:70. A small amount of phosphorus source is first deposited in the porous carbon micropores, followed by lithiation treatment to convert the phosphorus in the porous carbon into lithium phosphide nanoparticles, then a second deposition of silicon nanoparticles, and finally overall carbon coating. This invention's modified silicon-carbon anode material improves the problem of rapid impedance increase in the low-charge range of silicon-carbon anode materials, significantly enhancing the user experience.

The application belongs to the field of metal matrix composites, and particularly relates to a titanium phosphide particle reinforced Al-Si matrix composite material and a preparation method thereof. The application comprises the following steps: step (1): weighing raw materials: weighing aluminum phosphorus intermediate alloy, industrial pure aluminum, industrial pure silicon and sponge titanium according to proportions; step (2): melting: placing the weighed industrial pure aluminum, industrial pure silicon and sponge titanium into a water-cooled copper crucible of a vacuum arc furnace, heating to 850-1150 DEG C to melt, obtaining an aluminum alloy ingot; placing the obtained aluminum alloy ingot and the aluminum phosphorus intermediate alloy in the same water-cooled copper crucible, melting to obtain the titanium phosphide particle reinforced Al-Si matrix composite material. The application forms micro / nano dual-scale reinforcement through the titanium phosphide particle reinforced Al-Si matrix composite material, TiP particles generated and nano AlP particles formed by evolution of the TiP, so that the strength, toughness and wear resistance of the Al-Si matrix composite material at high temperature are improved.

The invention provides a preparation method of a nickel phosphide catalyst applicable to preparation of adipic acid by electro-oxidation of cyclohexanone and an electrolysis device, and belongs to the technical field of new energy chemical engineering, and the preparation method specifically comprises the following steps: putting foamed nickel into a high-pressure reaction kettle containing a mixed solution of nickel nitrate, ammonium fluoride and urea, reacting at 100-120 DEG C for 8-12 hours, filtering, washing, and drying to obtain the nickel phosphide catalyst applicable to preparation of adipic acid by electro-oxidation of cyclohexanone. The obtained nickel hydroxide is placed at the downstream of a tubular furnace, the obtained sodium hypophosphite is placed at the upstream of the tubular furnace, heating is conducted for 2-4 hours at the temperature of 300-400 DEG C under the inert atmosphere, the nickel phosphide catalyst with high adipic acid selectivity in the cyclohexanone electrooxidation reaction is obtained, the nickel phosphide catalyst is especially suitable for large-current and long-time catalytic reaction, and the productivity and efficiency in unit time are greatly improved. Meanwhile, the problem that a high-performance catalyst is complex to prepare is solved, the synthesis condition is mild, the process is simple, the reproducibility is good, expensive raw materials or complex equipment is not needed, the production cost is remarkably reduced, and a solid foundation is laid for large-scale industrial application.

The invention discloses a phosphotungsten / molybdenum synergistic modified supported catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysis. The catalyst takes gamma-Al2O3 as a carrier and takes transition metal oxide and / or phosphide as an active component. The catalyst is prepared by precursor dipping, drying at 80-120 DEG C and calcining at 300-500 DEG C. The synergistic effect of phosphorus, tungsten and molybdenum is utilized, so that acid sites are newly increased, the acid strength is enhanced, and agglomeration of active components is inhibited. The catalyst provided by the invention has excellent catalytic performance, has higher reaction activity under the pressure of 0.5 Mpa, which is far lower than the pressure provided in the prior art, and has the characteristics of high target product yield, good catalyst stability, simple preparation process and low production cost.

This invention discloses a molybdenum phosphide quantum dot-embedded polyaniline-derived hollow sphere hard carbon composite material and its preparation method. The preparation method includes the following steps: (1) preparing polyaniline hollow spheres using aniline, hydrogen peroxide, anhydrous ferric chloride, and phosphoric acid aqueous solution as raw materials via a hydrothermal method; (2) immersing the polyaniline hollow spheres in concentrated hydrochloric acid, drying them, and then performing a secondary hydrothermal treatment with ammonium molybdate tetrahydrate and ammonium dihydrogen phosphate to obtain a precursor; (3) further carbonizing and phosphating the precursor with sodium hypophosphite monohydrate to obtain the molybdenum phosphide quantum dot-embedded polyaniline-derived hollow sphere hard carbon composite material. In this composite material, molybdenum phosphide is embedded in the hard carbon wall of polyaniline hollow spheres with a diameter of 200-300 nm in the form of 2-3 nm quantum dots, accounting for approximately 20-25 wt% by mass. The composite material provided by this invention can be used as an electrode material, and the potassium-ion batteries prepared from it have high specific capacity, good cycle stability, and excellent rate performance. Furthermore, the method provided by this invention has the advantages of simple process, low cost, and large-scale production capability.

The application discloses a production method of base oil, which comprises the following steps: carrying out a hydroisomerization reaction on a lubricating oil base oil raw material under the action of at least one metal phosphide catalyst to obtain base oil, characterized in that the metal phosphide catalyst comprises a metal component and a carrier, the metal phosphide catalyst is subjected to twice modification treatment, the first modification is to introduce a first modification aid alkali metal and / or an acidic compound into the carrier, and the second modification is to introduce a second modification aid polyhydroxy organic compound into the metal component. According to the production method of the base oil, the lubricating oil base oil with low condensation point and low pour point can be produced by taking wax oil as the raw material and carrying out the hydroisomerization reaction on the wax oil by using the metal phosphide catalyst, meanwhile, the lubricating oil base oil produced by the application has low aromatic hydrocarbon content and high total lubricating oil base oil yield.

The application discloses an electrocatalytic composite material of MXene loaded with copper phosphide nanoparticles as well as a preparation method and application thereof, and comprises the following steps: (1) dispersing MXene, a copper precursor, a phosphorus precursor and anhydrous sodium citrate in deionized water, continuously stirring until completely dissolved, adjusting pH by sodium hydroxide, and preparing a mixed solution; (2) under the environment of inhaled inert gas, adding sodium borohydride solution drop by drop into the mixed solution, and stirring intensively; when the reduction reaction is completed, centrifuging, washing and freeze-drying the obtained solid-liquid mixture, and finally obtaining P-Cu@MX composite material. The composite material is used as an electrocatalyst, is coated on the surface of a conductive material, forms a high-efficiency catalytic electrode, and constructs a reactor, so that the co-reduction of NO3 ‑ and CO2 into urea can be realized.

The invention provides an amorphous substance coated positive electrode active material as well as a preparation method and application thereof. In the invention, the amorphous substance is selected from one or more of transition metal silicide, boride, phosphide, sulfide, selenide, carbide, amorphous carbon or amorphous silicon materials. The amorphous substance coating in the invention can form a compact self-healing passivation layer at the interface of the positive electrode material, not only can inhibit oxygen precipitation under high voltage in dynamics, but also can be combined with Li alkali metal to become a mixed conductor of ions and electrons, so that the conduction performance of the electrons and lithium ions is improved, and the interface impedance is reduced. Meanwhile, the surface of the positive electrode material can be uniformly coated by a special coating mode of the amorphous substance, so that side reaction between the positive electrode material and electrolyte is effectively inhibited, a solid electrolyte membrane on the surface of the positive electrode material is stabilized, formation of microcracks in the material is reduced, and the cycling stability is improved.

The application provides a composite lithium negative electrode material for a solid-state lithium metal battery and a preparation method and application thereof, the preparation raw material of the composite lithium negative electrode material comprises an additive, lithium metal and a solid-state electrolyte; the additive is selected from one or more of gallium phosphide, indium phosphide, tin phosphide, iron phosphide, cobalt phosphide, nickel phosphide, molybdenum phosphide, manganese phosphide, black phosphorus and red phosphorus. The composite lithium negative electrode material prepared by using the additive has good wettability to the solid-state electrolyte sheet, significantly reduces the interface resistance between the solid-state electrolyte and the lithium metal negative electrode, improves the critical current density and the cycle stability, is very close to the solid-state electrolyte sheet at the interface, has good matching with a commercial lithium iron phosphate positive electrode, and the assembled full battery has excellent rate performance and cycle performance.