154results about "Phosphides" patented technology

The application discloses a preparation method of carbon aerogel material for light electromagnetic shielding, and comprises the following steps: adding resorcinol, phloroglucinol, a template agent and formaldehyde into pure water, stirring and dissolving to obtain a precursor solution; adding the precursor solution into white oil containing a surfactant, emulsifying, heating in an oil bath and fully reacting; centrifugal separation to obtain powder, high-temperature carbonization, dispersion in oleylamine, addition into a stock solution containing nickel acetylacetonate, triphenylphosphine and oleylamine, high-temperature reaction and cooling, addition of a mixture of hexane and ethanol to obtain a product; centrifugal separation and washing to obtain light high-electromagnetic-shielding carbon aerogel. The carbon aerogel material for light electromagnetic shielding prepared by the method has the advantages of small density, high efficiency, corrosion resistance, high electromagnetic shielding efficiency, high product yield and the like, and by controlling the nucleation and growth rate of Ni2P, the Ni2P nanoparticles can be uniformly grown on the carbon aerogel microspheres, and the method is suitable for application in large-scale industrial production.

The invention discloses a preparation method and application of nickel-cobalt bimetallic phosphide for in-situ growth of nitrogen-doped carbon nanotubes. The preparation method comprises the following steps: preparing a graphene oxide dispersion liquid; sequentially adding a cobalt source, a nickel source, a segmented copolymer, a phosphorus source and a nitrogen source into the graphene oxide dispersion liquid, and uniformly mixing to obtain a mixed solution; drying the mixed solution to obtain a precursor; and annealing the precursor in an inert atmosphere to obtain the product. According to the nitrogen-doped carbon material coated phosphide nano-particle composite material and the preparation method thereof, by regulating and controlling the ratio of Ni to Co, a carbon source grows on graphene in situ to form a carbon nano-tube, nickel-cobalt bimetal phosphide nano-particles are uniformly distributed on a nitrogen-doped carbon material to form the nitrogen-doped carbon material coated phosphide nano-particle composite material, and the nitrogen-doped carbon material coated phosphide nano-particle composite material is used as a modified diaphragm material of a lithium-sulfur battery. The preparation method disclosed by the invention has the advantages of mild reaction conditions and easiness in amplification and regulation, and the prepared composite material has a relatively high specific surface area and can be applied to the field of energy sources, especially the field of lithium-sulfur batteries.

The invention provides a positive electrode active material, a preparation method thereof, a positive electrode plate containing the positive electrode active material, a full-tab battery cell and an electric device, and relates to the technical field of lithium ion batteries. The positive electrode active material is of a double-spherical particle structure with a glass-phase neck bridge at a contact neck part, each spherical particle comprises an active material body and a coating layer coating the active material body, and the active material body is lithium iron phosphate dispersed with Fe2P; the average thickness tsh of the coating shell layer is equal to 5 to 9 nm; the thickness tcheck of the glass phase neck bridge is 5-25nm, and the total content G of the glass phase in the positive electrode active material is 1.5-2.2 wt%; the volume average particle size of the positive electrode active material is 7-9 [mu] m. According to the positive electrode active material disclosed by the invention, through the cooperation of the coating shell layer, the embedded Fe2P nano second phase and the glass phase neck bridge, the comprehensive performance of a full-tab battery cell and an electric device can be effectively improved.

This invention belongs to the field of lithium-ion battery technology, specifically relating to a composite cathode material for lithium-ion batteries and its preparation method. The composite cathode material consists of three parts: a cathode matrix material, a lithium replenishment material, and a catalyst material. The preparation method is as follows: (1) preparing a composite material of the cathode matrix material and the lithium replenishment material in situ; (2) dispersing the catalyst material on the surface of the composite material and forming a stable interface layer between the catalyst material and the lithium replenishment material. Through the method of this invention: the lithium replenishment material has both surface modification of the cathode matrix material and lithium replenishment of the negative electrode, simultaneously improving the battery's initial efficiency and cycle stability; introducing the catalyst material onto the surface of the lithium replenishment material in situ fixes the free O generated by the Li release from the lithium replenishment material, alleviating the battery swelling phenomenon and further improving the battery's cycle stability and safety; moreover, the preparation process is simple, the raw materials are cheap and readily available, the production cost is low, and it is easy to promote industrial production.

The present application relates to the technical fields of wastewater purification and energy storage material, and discloses an energy storage carbon material, a preparation method and application thereof.The method comprises the following steps: carbonizing biomass waste enriched with metal ions to obtain an energy storage carbon material.The energy storage carbon material can be used to prepare a secondary metal / ion battery.The energy storage carbon material prepared by the present application can promote the uniform deposition of metal in the charging and discharging process, avoid the safety problems caused by dendrite growth, and at the same time, the metal ions in industrial wastewater can be used to prepare high-value-added secondary battery energy storage materials by means of a simple and low-cost method of biosorption.

This invention provides a bamboo-like carbon nanotube with a heterostructure, its preparation method, and its applications. The preparation method includes: dissolving cobalt nitrate and heteropolyacid in ethanol to obtain a first solution; dissolving dicyandiamide in a mixed solution of ethanol and water to obtain a second solution; mixing phytic acid with the second solution uniformly and performing a polymerization reaction to obtain a third solution; adding the first solution to the third solution to perform a chemically induced self-assembly reaction, washing and drying to obtain a dicyandiamide-heteropolyacid-phytic acid-cobalt ion organic polymer; and calcining to obtain the bamboo-like carbon nanotube with a heterostructure. This method is simple and inexpensive; the Co2P and WN / MoN nanoparticles in the bamboo-like carbon nanotube are uniformly distributed in the carbon matrix, improving the electrochemical performance of the material; the introduction of dicyandiamide and phytic acid enables nitrogen and phosphorus doping of the carbon framework, improving the conductivity of the carbon support; and the resulting product exhibits high capacity and excellent cycle stability as a cathode material for metal-air batteries.

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.

The invention relates to the technical field of lithium-sulfur battery positive electrode materials, in particular to a metal organic framework-based porous cubic composite material and a preparation method and application thereof, the preparation method is simple, and the obtained composite material is applied to a positive electrode of a lithium-sulfur battery and can improve the discharge capacity and the initial efficiency. The preparation method comprises the following steps: (1) performing high-temperature treatment on a metal organic framework ZIF-67 at a first temperature in an inert gas atmosphere to obtain ZIF-67 after heat treatment; the first temperature ranges from 500 DEG C to 900 DEG C; (2) in an inert gas atmosphere, the ZIF-67 subjected to heat treatment is subjected to phosphating in the presence of a phosphating agent at a second temperature, so that Co in the ZIF-67 subjected to heat treatment is partially phosphated; the second temperature is 100 to 500 DEG C; and (3) grinding the product obtained in the step (2) to obtain the composite material.

The invention discloses a preparation method of FePS3, which comprises the following steps: mechanically mixing pyrite powder, sulfur-containing small molecules and elemental phosphorus, calcining the fully mixed powder in two temperature stages under a protective atmosphere, and cooling to obtain FePS3 nano-powder; wherein in the first temperature stage, the temperature is 200-300 DEG C, and the heat preservation time is 120-240 minutes, and in the second temperature stage, the temperature is 400-600 DEG C, and the heat preservation time is 120-180 minutes; the sulfur-containing small molecules are thiourea, thioacetamide or a mixture of the thiourea and the thioacetamide; the molar ratio of sulfur atoms to phosphorus atoms in FeS2 molecules and sulfur-containing small molecules in the pyrite powder is (1: 3: 5)-(1: 1: 5). According to the method, pyrite is used as an iron source and a sulfur source, sulfur-containing small molecules are used as a second sulfur source, and the FePS3 nano-powder is directly obtained through solid-phase reaction with the simple substance phosphorus without additional purification treatment. The method is low in solid-phase reaction temperature and simple in process, does not need harsh reaction conditions, and is easy for large-scale production.

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.

A quantum dot comprising a core comprising indium and having a first band gap; a first shell substantially surrounding the core, the first shell comprising a first semiconductor material having a second band gap that is greater than the first band gap; and a second shell substantially surrounding the first shell, the second shell comprising a second semiconductor material having a having a third band gap that is greater than the second band gap, wherein the first shell comprises three or more monolayers and less than or equal to twenty-two monolayers of the first semiconductor material; and liquid crystal displays comprising the same.

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 present invention relates to a method for producing a crystalline solid electrolyte having a small particle diameter and also having a high ionic conductivity and containing a lithium element, a sulfur element, a phosphorus element and a halogen element, the method including a complexing step of mixing a solid electrolyte raw material and a complexing agent in a liquid phase, wherein the method includes a mixing step of obtaining a precursor containing a lithium element, a sulfur element, and a phosphorus element; and a crystallization step of heating the precursor in a solvent using a pressure-resistant container or while refluxing.

The invention provides a preparation method of a CoO / CoP-LIG heterojunction electrolyzed water catalyst, and belongs to the technical field of preparation methods of electrocatalytic materials. CoO and CoP in the obtained electro-catalysis material are of a heterostructure, a large number of active interfaces and defect sites are exposed between the two components, and the electro-catalysis reaction is facilitated. The laser induced graphene (LIG) has excellent conductivity and huge specific surface area, and an ideal platform is provided for loading of CoO / CoP heterojunction nanosheets and construction of electron / mass transfer channels. The water electrolysis catalyst is simple in preparation process, high in stability, low in raw material price, easy to realize industrial mass production, and beneficial to realizing industrial development of hydrogen production by water electrolysis. The electrolyzed water catalyst can also be applied to degradation of urea in industrial and agricultural pollutants, and is an environment-friendly electrolyzed water catalyst.

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.

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.

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.

The invention relates to the technical field of new energy battery materials, in particular to a uniformly-coated sulfide solid electrolyte and a preparation method and processing device.The preparation method comprises the steps that oxygen is preheated, and hot oxygen flow is formed; and dynamically scouring the sulfide solid electrolyte powder by using hot oxygen gas flow to obtain the uniformly coated sulfide solid electrolyte. Oxygen is preheated, so that high-temperature hot oxygen flow is formed to directionally scour the surface of sulfide solid electrolyte powder, and oxygen atoms are promoted to react with sulfide solid electrolyte to generate a stable oxygen-doped structure; according to the method, high-temperature sintering or high-pressure equipment is not needed, the process energy consumption is reduced by more than 50%, and the method can be directly integrated to an existing solid electrolyte production line; in addition, the oxygen-doped sulfide solid electrolyte is exposed in an air environment for 24 hours, so that the ionic conductivity retention rate is remarkably improved, and meanwhile, the requirements of large-scale production are met.

The invention discloses an efficient electro-catalytic hydrogen evolution catalyst suitable for an alkaline system and a preparation method thereof.The catalyst is prepared by taking nickel foam (NF) with the high specific surface area and excellent conductivity and chemical stability as a carrier through a hydrothermal method in combination with a phosphating process, the core structure is a trace ruthenium (Ru) doped MoNiP / Ni2P heterostructure, and the core structure is a MoNiP / Ni2P heterostructure. The invention aims to solve the problems that the existing noble metal-based (Pt, IrO2 and the like) catalyst is strong in scarcity and high in cost, and the traditional transition metal phosphide (TMPs) is insufficient in active site exposure, poor in hydrogen evolution activity under an alkaline condition, slow in reaction kinetics and the like, and provides a solution thought for getting rid of fresh water dependence and promoting industrial application for an electro-catalysis hydrogen evolution technology. Meanwhile, the catalyst is simple in research and invention operation, low in cost, good in economical efficiency, hopeful to be applied to large-scale industrial production and wide in application prospect.

The application discloses nitrogen-doped iron phosphide and a preparation method thereof, a negative electrode material, a secondary battery and an electric equipment, and the preparation method comprises the following steps: S1, dissolving iron salt and urea in an organic solvent to obtain a mixed solution; then, performing a solvothermal reaction on the mixed solution to obtain an iron phosphide precursor; and S2, performing phosphorization treatment on the iron phosphide precursor by using a hypophosphite under a protective atmosphere to obtain the nitrogen-doped iron phosphide. The nitrogen-doped iron phosphide prepared by the method overcomes the problems of large irreversible capacity and low electronic conductivity of the iron phosphide negative electrode material.

The preparation method comprises the following steps: putting flaky tantalum foil and phosphorus powder into a quartz tube as raw materials, adding iodine powder as a transport agent, and sealing the quartz tube; placing the quartz tube in a beaker filled with dry ice and an acetone solution, and vacuumizing the quartz tube; and putting the sealed quartz tube into a tubular furnace, heating to a reaction temperature of 800-900 DEG C, and preserving heat for 0.8-1.2 hours to obtain the TaP thin layer after the reaction is completed. According to the method, a chemical vapor transport method is adopted, the tantalum foil and the phosphorus powder which are regular in shape grow in a high-vacuum-degree closed environment and serve as raw materials, a small amount of iodine elementary substance is added to serve as a transport agent, the TaP thin layer which is high in quality and good in catalytic performance grows, and compared with pure blocky crystals (211.4 mV), the TaP thin layer has more excellent hydrogen evolution catalytic performance.

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 application discloses a metal phosphide modified lithium-rich manganese-based positive electrode material and a preparation method and application thereof, and relates to the technical field of lithium ion batteries. The lithium-rich manganese-based positive electrode material comprises a metal phosphide and a lithium-rich manganese positive electrode base material, the metal phosphide is doped in the lithium-rich manganese positive electrode base material, or the lithium-rich manganese positive electrode base material is surface modified. The lithium-rich manganese-based positive electrode material has excellent cycle stability and rate performance, and the capacity does not obviously decrease after 800 cycles.

The application discloses a kind of carbon-coated transition metal phosphide single-atom composite materials and its preparation method and application, comprising the following steps: S1, metal salt is dispersed with cation exchange resin in pure water, stirring at room temperature, then filtering and vacuum drying;S2, after vacuum drying, single-atom / carbon composite material is obtained by calcining under protective gas;S3, after mixing single-atom / carbon composite material with phosphorus source, low-temperature phosphorization treatment is carried out under protective gas, and after natural cooling, carbon-coated transition metal phosphide single-atom composite material is obtained by washing and drying.The application uses anion exchange resin as carrier material, and uses metal salt solution as precursor, to obtain carbon-coated transition metal phosphide single-atom composite material by low-temperature phosphorization after compounding, which exhibits high capacity when used as lithium ion negative electrode material.

The invention relates to the technical field of lithium / sodium ion battery negative electrode materials, in particular to a high-entropy phosphide negative electrode material with a double-carbon coating structure and a preparation method and application thereof.The method comprises the following steps that firstly, Cu, Ge, Sn, Ti, Si, phosphorus powder and a carbon material are mixed in proportion, ball milling is conducted, and a CuGeSnTiSiPx / carbon (CuGeSnTiSiPx / G) composite material is obtained; then, the CuGeSnTiSiPx / G composite material is dispersed in tetrahydrofuran, meanwhile, asphalt is added, stirring and mixing are conducted, and a mixture is obtained; and finally, carrying out high-temperature calcination on the mixture to obtain the high-entropy phosphide-based / graphite / carbon (CuGeSnTiSiPx / G (at) C) composite material. The CuGeSnTiSiPx / G composite material prepared by the invention comprises an outer compact carbon layer formed by coating asphalt carbon and an amorphous nano carbon layer structure of a high-temperature calcination performance outer layer. The double-layer carbon can effectively maintain the structural stability of the high-entropy phosphide in the cyclic process, and the problems of volume expansion and low electronic conductivity of the high-entropy phosphide are prevented, so that the multiplying power and the long cyclic stability of the high-entropy phosphide are improved.

The application discloses a phosphide nanometer array catalyst for seawater hydrogen evolution and a preparation method and application thereof. The catalyst takes foamed nickel as a carrier to provide support and conductive effect for the catalyst; the catalyst is composed of a composite material of nickel, molybdenum, phosphorus and cobalt, and a nanorod array structure of the catalyst main body is formed on the base. The cobalt-doped nickel molybdenum phosphide nanorod array catalyst provides high active sites, the phosphide layer is in-situ oxidized into an active phase of Ni(OH)2 to accelerate reaction kinetics, and granular phosphide (P-Metal bond) on the surface of the nanorod blocks Cl ‑ erosion, and a three-dimensional porous structure promotes bubble detachment to resist seawater corrosion; the catalyst can simultaneously serve as a cathode (HER) and an anode (OER) to realize dual-function integration, realizes full-hydrolysis voltage ≤1.60 V (10 mA cm ‑2 ) in 1 M KOH solution, and stably operates for ≥88 h (current density attenuation rate ≤10%) under a cell voltage of 1.90 V.

The invention relates to the field of batteries, in particular to a preparation method and application of a sulfide solid electrolyte precursor. The method comprises the following steps: (a) in an inert atmosphere, mixing raw materials with an inert non-polar solvent to obtain slurry; and (b) carrying out microjet shearing treatment and drying on the slurry under the condition of isolating water and oxygen. According to the method, the inherent problems of a traditional ball milling process are creatively solved through combination of micro-jet shearing treatment and an inert non-polar solvent. The method is operated in a closed pipeline, water and oxygen are thoroughly isolated, foreign matter pollution is fundamentally avoided due to the fact that a grinding medium is not needed, and the high purity of the precursor is guaranteed; meanwhile, nanoscale efficient and uniform mixing is achieved through an ultrahigh pressure shearing dispersion mechanism, the material mixing time is greatly shortened to several minutes from tens of hours, the efficiency is remarkably improved, the energy consumption is reduced, and the obtained precursor has extremely high reaction activity due to the huge specific surface area and the extremely short atom diffusion path.

A method for producing a quantum dot including crystalline nanoparticle fluorescent material, wherein, using a first precursor solution and a second precursor solution containing different elements each other, the second precursor solution is sprayed as an aerosol on the heated first precursor solution, or both the first precursor solution and the second precursor solution are sprayed on a heated solvent as aerosols, and the first precursor solution and the second precursor solution are reacted with each other to synthesize a core particle containing the different elements. The method for producing quantum dots, can suppress the non-uniformity of the particle size of the quantum dots and accompany increase in the distribution of emission wavelengths in large scale synthesis.

This invention relates to lithium / sodium-ion battery technology, aiming to provide a negative electrode material utilizing few-layer MXene roll-up encapsulation of tin phosphide and its preparation method. The negative electrode material includes a few-layer T3C2 MXene as a load substrate and tin phosphide particles as active centers; the tin phosphide particles are uniformly dispersed in the few-layer T3C2 MXene, and the sheet structure of the T3C2 MXene encapsulates the tin phosphide particles within it through mechanical roll-up. This invention enables precise control of the particle size, morphology, and crystal phase of tin phosphide particles, mitigating the damage to the material structure caused by conventional processes and reducing energy consumption. This invention achieves uniform dispersion of tin phosphide particles in conductive MXene through in-situ growth, while the excellent encapsulation effect formed by ball milling effectively suppresses tin phosphide particle shedding, structural damage, and excessive interfacial side reactions, ensuring the structural stability and sufficient electrical contact of the negative electrode material during cycling, thereby improving charge-discharge cycle stability and rate performance.