131results about How to "Improve reaction kinetics" patented technology

The present invention discloses a self-supporting flexible carbon material and its preparation method and application. It comprises the following steps: (1) using carbon felt as a working electrode and a counter electrode respectively, applying electricity in an electrolyte for 2 to 10 minutes, washing and drying, and obtaining an electrochemically stripped carbon felt; (2) using a mixture of nitrogen-containing conductive polymer monomers and alkaline solution as an electrolyte, and using the carbon felt treated in step (1) as a working electrode to construct a three-electrode system for electrochemical treatment, washing and drying, and obtaining a carbon felt loaded with a nitrogen-containing conductive polymer; (3) heat treating the carbon felt obtained in step (2) at 800 to 900°C in a protective gas atmosphere for 1 to 2 hours, cooling to room temperature, and then washing and drying. The present invention can simultaneously complete the two steps of element doping and activation through a one-step high-temperature process, and the prepared flexible carbon material has excellent electrochemical properties.

The invention belongs to the field of electrochemistry, and relates to a method for modifying a zinc-bromine battery positive electrode material by an ionic liquid bromine complexing agent, which innovates the use mode of the ionic liquid bromine complexing agent as an electrolyte additive in a zinc-bromine battery and performs surface modification on an original carbon electrode. The method comprises the following steps: firstly, treating an electrode to improve the surface hydrophilicity and improve the internal pore structure type of the material; then, the ionic liquid is uniformly distributed on the surface of the electrode and in the internal pore diameter in a dipping-ultrasonic-spraying combined mode, uniform modification of an electrode material is realized, and finally, a total battery is assembled to evaluate the practicability of the experimental strategy. Ionic liquid which can have strong interaction with polybromine species is optimized, the defects that the ionic liquid serving as an electrolyte additive and bromine species generate out-of-phase complexation products to be dispersed in an electrolyte, the utilization rate of active substances is low, reaction kinetics is slow and the like are overcome, and by means of effective attachment of the ionic liquid on the surface of an electrode, the reaction efficiency is improved. Effective fixation of bromine species on the surface of the electrode is achieved, and battery capacity loss caused by the shuttle effect of the bromine species is relieved. The method comprises an original electrode pretreatment method, an electrode material modification method and ionic liquid selection. The zinc-bromine battery prepared by the invention has the advantages of high charge-discharge efficiency, low battery self-discharge rate, fast reaction kinetics and the like.

The invention provides an Mxene-iron molybdenum bimetallic sulfide and carbon composite material as well as a preparation method and application thereof, belongs to the technical field of sodium ion batteries, and is used for solving the technical problems of poor conductivity and rate capability of a metal sulfide negative electrode material. The preparation method of the Mxene-iron-molybdenum bimetallic sulfide and carbon composite material comprises the following steps: dissolving an iron source, a molybdenum source and a carbon source in a solvent to prepare a mixed solution; then carrying out a hydrothermal reaction to prepare a bimetallic oxide nanosphere; the bimetallic oxide nanospheres are subjected to high-temperature vulcanization treatment, and iron-molybdenum bimetallic sulfide carbon is prepared; the preparation method comprises the following steps: mixing Mxene and iron-molybdenum bimetallic sulfide and carbon through ball milling to prepare the Mxene-iron-molybdenum bimetallic sulfide and carbon composite material. The composite material disclosed by the invention can realize efficient electron transmission and provide more active sites, and is beneficial to the electrochemical reaction of the battery; the mechanical stability of the material can be enhanced, the volume expansion in the charging and discharging process is effectively reduced, the particle diffusion path between positive and negative electrodes is shortened, and the reaction kinetics of the electrode is improved; and the conductivity and the rate capability of the material can be effectively improved, so that the comprehensive performance of the sodium-ion battery is improved.

The invention discloses a preparation method and application of an ammonium ion pre-embedded Cu-MOF derived CuHCF / MXene electrode material, and relates to the technical field of new energy nanometer materials. According to the preparation method, Cu-BTC is taken as a sacrificial template, ammonium ion pre-embedding and flaky MXene compounding are carried out, and synthesis is carried out under the condition of coprecipitation at room temperature. The preparation method provided by the invention is low in cost and simple in process, and the obtained electrode material is excellent in morphology and performance. When the prepared CuHCF / MXene composite electrode is applied to capacitive deionization, the characteristic of high NH4 < + > adsorption capacity is shown. According to the preparation method, hydrogen-bond interaction is formed between H atoms in NH4 < + > and N atoms in CuHCF, so that the NH4 < + > adsorption potential energy is reduced, the adsorption capacity is improved, and meanwhile, the defects that CuHCF is prone to agglomeration, poor in conductivity and the like are overcome through self-assembly of the CuHCF and MXene.

The invention relates to the technical field of energy storage, in particular to an iron monatomic modified carbon nanotube array, a preparation method and application of the iron monatomic modified carbon nanotube array in an aqueous zinc-iodine battery, simple and convenient solid-phase reaction and high-temperature carbonization strategies are adopted, carbon cloth serves as a substrate, ferric acetylacetonate, boric acid, polyethylene glycol and urea serve as an iron source, a boron source, a carbon source and a nitrogen source respectively, and the iron monatomic modified carbon nanotube array is prepared. And after high-temperature calcination, growing an iron monatomic modified carbon nanotube array on the carbon cloth in situ. The iron single atom not only enhances the chemical capture capability of the carbon nanotube on the polyiodide, but also promotes the oxidation-reduction conversion of iodine; the carbon nanotube array provides a physical space for limited adsorption of iodine species and effectively promotes ion diffusion. Therefore, the obtained water-based zinc-iodine battery shows high specific capacity and good cycling stability. The whole technological process is simple and convenient to operate, has industrial application prospects, and provides a novel preparation method for the carbon-based iodine positive electrode host material of the aqueous zinc-iodine battery.

The invention provides a preparation method of spherical iron phosphate, and relates to the technical field of lithium ion batteries, and the preparation method comprises the following steps: S1, one-step reaction: carrying out parallel flow on an iron salt solution, a phosphorus salt solution and ammonia water according to a molar ratio of 1: (0.8-1.2): (0.8-1.1) to generate amorphous iron phosphate slurry; adding ammonia water into the iron phosphate slurry to adjust the pH value to 1.5-2.5; s2, membrane washing; s3, a second-step reaction: adding pure water into the washed iron phosphate slurry, adjusting the iron concentration to 0.5-1.2 mol / L, adding a phosphoric acid solution, heating to 90-120 DEG C, and controlling the heat preservation time for 30-90 minutes after the material is converted into a white material, so as to obtain white slurry; s4, washing: taking a filter cake; s5, drying: generating iron phosphate dihydrate; s6, calcining: spherical iron phosphate is generated, and the iron phosphate is successfully converted from a traditional olive type, peanut type or honeycomb type to a spherical type through the preparation method provided by the invention.

The invention belongs to the technical field of electrochemistry, and discloses a pi-d conjugated covalent organic framework material, and a preparation method thereof comprises the following steps: adding 2, 5-hydroxyterephthalic acid, 2, 3, 5, 6-tetra (amino) p-benzoquinone and nickel acetate tetrahydrate into a container, then adding N-methyl pyrrolidone, carrying out ultrasonic treatment for 0.5 h, transferring into a hydrothermal reaction kettle, carrying out a sealed reaction for 2-5 days, and carrying out vacuum drying to obtain the pi-d conjugated covalent organic framework material. And after the reaction is finished, naturally cooling to room temperature, filtering, collecting, washing and performing vacuum drying on the obtained precipitate to obtain the pi-d conjugated covalent organic framework material. The covalent organic framework material disclosed by the invention is rich in N / O chemical adsorption sites and Ni < 2 + > catalytic sites, so that shuttling of polysulfide can be effectively inhibited; on the other hand, catalytic conversion of polysulfide is promoted, the reaction kinetics of the lithium-sulfur battery is further accelerated, and compared with a traditional covalent organic framework, the conductivity is greatly improved, and the electron transmission capacity is improved.

The invention discloses a preparation method and application of a sulfur-doped metal monatomic loaded porous carbon material. Metal ions and sulfonic acid groups are utilized to form stable coordination bonds, the stable coordination bonds are confined in a zeolite imidazole-8 three-dimensional network porous structure, and the sulfur-doped metal monatomic loaded porous carbon material is obtained through pyrolysis. The material is in a dodecahedron shape, the particle size is 100-1000 nm, and the mass percent of metal monatomic is 0.1%-10%. In addition, the electronic structure of the active site of the catalyst is adjusted through sulfur doping, the monatomic adsorption and catalysis capability is improved, polysulfide shuttling is relieved, the electrode conversion reaction kinetics is improved, and the high-performance lithium-sulfur battery is achieved.

The invention discloses a preparation method of a circulation type gas diffusion electrode for electrochemical CO2 reduction, and belongs to the technical field of electrochemical CO2 reduction. The circulation type gas diffusion electrode directly conveys carbon dioxide to the surface of a cathode in the electrochemical CO2 reduction process; the specific preparation method comprises the following steps: adding N-methyl-2-pyrrolidone into polyethyleneimine, and carrying out ultrasonic treatment; the preparation method comprises the following steps: adding copper powder into a transparent and uniform mixed solution of N-methyl-2-pyrrolidone and polyethyleneimine, and carrying out magnetic stirring; and calcining the uniform mixture of N-methyl-2-pyrrolidone, polyethyleneimine and copper powder and the hollow fiber of polyethyleneimine and copper powder in a smelting furnace to obtain the FTGDE electrode. By adopting the preparation method of the circulation type gas diffusion electrode for electrochemical CO2 reduction, disclosed by the invention, efficient transmission and utilization of carbon dioxide are ensured, and the electrochemical reduction reaction efficiency is improved.

The invention discloses a sodium-ion battery electrolyte as well as a preparation method and application thereof, and belongs to the technical field of battery electrolytes. According to the preparation method disclosed by the invention, the boric acid ester additive is added into the basic electrolyte, and the boric acid ester is preferentially decomposed in the battery circulation process, so that the generated boron-containing substance can inhibit the side reaction of the electrolyte and increase the stability of the electrolyte; the boric acid ester preferably participates in the formation of electrode / electrolyte interface layers on the two sides of the positive electrode and the negative electrode, and the boric acid ester assists in dissolving NaF with low ionic conductivity at the electrode / electrolyte interface and promotes dissociation of sodium salt in the electrolyte to increase free sodium ions, so that the diffusion rate of the sodium ions is improved, and the performance of the sodium-based half cell and the sodium-based total cell is improved; and the capacity retention ratio and the rate capability of the sodium-nickel iron sodium manganate battery at room temperature or low temperature can be improved.

The invention belongs to the technical field of electro-catalytic materials, and particularly discloses an N / O co-doped carbon bowl electrode material and a preparation method and application thereof. The preparation method comprises the following steps: mixing ammonia water, silicon alkoxide, alcohol and water to obtain a mixed solution; mixing the mixed solution, resorcinol and a formaldehyde solution, centrifuging to obtain a precipitation sample, and annealing the precipitation sample to obtain solid carbon nanospheres; the solid carbon nanospheres and an alkaline solution are subjected to an etching reaction, and an N / O co-doped carbon bowl electrode material is obtained; the time of the etching reaction is 90 to 100 hours. The prepared N / O co-doped carbon bowl electrode material is a metal-free carbon catalyst, and a prepared N / O co-doped carbon bowl electrode has high ORR activity, excellent 2e-selectivity and long-term stability, and has important significance for promoting acidic electrosynthesis of H2O2.

The invention provides a negative pole piece and a lithium ion battery, the negative pole piece comprises a current collector, a first electrode material layer and a second electrode material layer, the first electrode material layer and the second electrode material layer are sequentially stacked on the current collector along a direction far away from the current collector, and the first electrode material layer and the second electrode material layer both comprise active materials. The active material comprises first active material particles and second active material particles, the particle size of the first active material particles is larger than that of the second active material particles, and the total mass of the first active material particles in the first electrode material layer is smaller than that of the second active material particles; the total mass of the first active material particles in the second electrode material layer is greater than the total mass of the second active material particles. The cycle performance and the electrical performance of the battery cell can be improved by regulating and controlling the ratio of the first active material particles to the second active material particles in the first electrode material layer and the second electrode material layer.

The invention provides a modified flow battery electrode capable of simultaneously improving activity and stability and a preparation method thereof.The method comprises the following steps that a carbon felt electrode material is added into a mixed solution of stannic chloride, manganous nitrate, melamine and urea, high-pressure treatment, ultrasonic cleaning and drying are conducted after magnetic stirring, and the modified electrode is obtained; adding the modified electrode into a mixed solution of nickel nitrate, melamine and urea, performing magnetic stirring, high-pressure treatment, ultrasonic cleaning and drying to obtain a modified electrode, immersing the modified electrode into a mixed solution of nickel nitrate, dopamine hydrochloride, polyamino acid, sodium citrate and ethanol, performing washing and drying, and then performing high-temperature treatment and pickling and drying to obtain an activated electrode; the voltage efficiency, the energy efficiency and the peak power density are greatly improved, the electrocatalytic activity of the flow battery is remarkably improved, and the stability of the electrode is also greatly improved while the electrocatalytic activity is improved.

The invention discloses a carbon-coated oxygen-vacancy-enriched hollow sphere H-CeO2-coated C-NC composite material and a preparation method and application thereof.The method comprises the steps that 1, polyvinylpyrrolidone is dissolved in an ethanol solution, CeCl3. 7H2O is added, Cu2O is added after the CeCl3. 7H2O is dissolved, stirring is conducted at the room temperature, and a brick-red solution is obtained; step 2, dropwise adding a sodium thiosulfate solution into the brick red solution to obtain a faint yellow solution, stirring at room temperature, and then sequentially standing, aging, centrifuging, washing and vacuum drying to obtain light yellow hollow CeO2 powder; step 3, respectively taking the hollow CeO2 powder and dopamine hydrochloride, adding into a Tris buffer solution, uniformly stirring, and sequentially centrifuging, washing and vacuum drying to obtain a CeO2 composite material CeO2 (at) PDA coated with polydopamine; and step 4, placing the CeO2 (at) PDA in a tubular furnace, and performing high-temperature carbonization treatment in an argon atmosphere to obtain the carbon-coated oxygen-vacancy-rich hollow sphere H-CeO2 (at) C-NC composite material which can endow the Li-S battery with excellent rate capability and good long cycle stability.

This invention relates to the field of hafnium carbide technology and discloses a thermal decomposition preparation process for hafnium carbide precursors. The process includes: dissolving hafnium tetrachloride in anhydrous ethanol, adding propylene oxide dropwise for neutralization and acid removal to obtain a neutral ethanol-hafnium precursor solution; adding ethyl acetoacetate methacrylate and heating for coordination to obtain a hafnium coordination monomer solution; adding acrylonitrile and an initiator and heating for polymerization; when the viscosity of the reaction solution increases, injecting a dimethyl sulfoxide hot solution of melamine as a locking liquid; precipitating, separating, and drying to obtain the hafnium carbide precursor; and after oxidative crosslinking treatment, calcining at high temperature under an inert atmosphere to undergo carbothermic reduction to obtain hafnium carbide powder. This invention achieves molecular-level dispersion of precursor components through liquid-phase coordination and in-situ network locking, effectively reducing the reaction temperature and inhibiting grain agglomeration, thus producing high-purity, ultrafine hafnium carbide powder.

The invention relates to a preparation method of a seaweed derived alloy carbon sodium ion battery negative electrode material, and belongs to the technical field of sodium ion batteries, and the specific scheme comprises the following steps: step 1, drying cleaned seaweed leaves; 2, chopping the dried seaweed leaves, and calcining and carbonizing the chopped seaweed leaves and an activating agent; 3, washing the carbonized material with deionized water until the carbonized material is neutral, and drying to obtain a seaweed precursor; and 4, uniformly grinding the seaweed precursor and two metal salts, and reacting under microwave radiation to obtain the seaweed-derived alloy carbon sodium ion battery negative electrode material. The seaweed-derived alloy carbon prepared by the method can generate more active sites to store sodium ions, and the diffusion rate of the sodium ions is improved, so that the electrochemical performance is improved. In addition, in the synthesis process, the speed is very high, no solvent exists, and the yield is high.

The present invention belongs to the technical field of photocatalytic material preparation, and discloses a preparation method and application of a metal oxide heterojunction photocatalyst with a high-speed electron transmission channel. The present invention uses a simple water bath physical mechanical stirring technology to perfectly combine two semiconductors with matching energy levels in a very short time by constructing a dense interface under mild reaction conditions. At the same time, the present invention perfectly inlays two oxides with flower morphology and leaf structure for the first time through interface connection, providing a high-speed transmission channel for photogenerated electrons in the photocatalytic reaction, and ultimately achieving an improvement in the photocatalytic CO2 reduction performance.

The invention discloses a low-temperature-resistant negative electrode zinc paste and a low-temperature alkaline zinc-manganese battery containing the zinc paste. The negative electrode zinc paste comprises the following components in parts by weight: 60-65 parts of zinc powder, 1-2 parts of a composite conductive agent, 0.1-0.3 part of a composite corrosion inhibitor and 35-38 parts of a low-temperature electrolyte; the low-temperature electrolyte comprises a multi-element nonionic surfactant system, a multi-element nano anti-freezing agent system and a mixed solution A, the 3.9 ohm discharge capacity of the battery under the condition of-40 DEG C is larger than or equal to 60% compared with the capacity retention rate at normal temperature, the interface impedance amplification is smaller than or equal to 15%, the hydrogen evolution amount is reduced by 80% on year-on-year basis, the process is compatible with an existing production line, and the battery is suitable for polar scientific investigation and electronic equipment in plateau and cold regions.

The invention discloses a porous carbon fiber supported black phosphorus / nitrogen-doped carbon composite material as well as a preparation method and application thereof, and belongs to the field of new energy materials and devices. A nitrogen-doped carbon-coated porous carbon fiber conductive frame is prepared by using a metal-assisted chemical etching technology, then red phosphorus is converted into black phosphorus by adopting a solvothermal and confinement growth strategy, and the black phosphorus grows in a pore channel of the nitrogen-doped carbon-coated porous carbon fiber frame in an in-situ confinement manner, so that the high-performance self-supporting phosphorus / carbon heterostructure electrode material is constructed and obtained. The three-dimensional nitrogen-doped carbon-coated porous carbon fiber conductive framework realizes high-speed electron / ion transmission and limits the expansion of the electrode structure; abundant nitrogen doping defects are beneficial to abundant reaction active sites and enhancement of reaction kinetics; the in-situ formed phosphorus / carbon heterogeneous interface can promote electron transfer and ion diffusion, stabilize the electrode structure and realize stable, rapid and reversible sodium storage.

The invention discloses a preparation method and application of a bimetallic Cu / Ni / C-S composite material applied to a room-temperature sodium-sulfur battery positive electrode, and relates to the technical field of new energy material preparation. The bimetallic Cu / Ni / C-S composite material prepared by adopting a chemical deposition method, a high-temperature calcination method and a melt diffusion method in sequence is good in homogeneity, the three-dimensional structure of the bimetallic Cu / Ni / C-S composite material is composed of nanocubes with the average length being 200 nm, the specific surface area is large, multiple internal exposed atomic sites can be achieved, sulfur distribution can be optimized, the reactivity of the bimetallic Cu / Ni / C-S composite material can be enhanced, and the service life of the bimetallic Cu / Ni / C-S composite material is prolonged. The transmission path of sodium ions can be shortened; rich micropore and mesoporous structures on the nano cube are beneficial to diffusion of confinement sulfur and electrolyte; meanwhile, the bimetallic copper-nickel has a relatively strong chemical adsorption effect on polysulfide, and can catalyze conversion of the polysulfide, effectively inhibit dissolution of the polysulfide, accelerate reaction kinetics and shorten a transmission path of sodium ions, so that the room-temperature sodium-sulfur battery with excellent electrochemical performance is obtained.

The invention relates to a magnetic nanorod, in particular to a preparation method and application of the magnetic nanorod. The invention develops a simple strategy to synthesize the magnetic nanorod with peroxidase (POD) activity, the magnetic nanorod can be used as a nanoenzyme and can also be used as a magnetic stirring nanorod for a micro-catalytic reaction, and the magnetic nanorod is used in a microfluidic system to realize quantitative detection of an object to be analyzed. The method has the advantages of mild conditions, greenness and higher controllability on the particle size. A dynamic nano-enzyme system is constructed on the basis of the magnetic nanorod to quantitatively detect cysteine. Compared with the static nano-enzyme, the dynamic nano-enzyme has the advantages that the enzyme activity can be maximally three times of the original enzyme activity, and the reaction kinetics is obviously enhanced.

The invention discloses a method for preparing a graphene-supported Ni-MOF hydrogen storage catalyst, wherein nickel nitrate hexahydrate and graphene oxide are weighed and dissolved in dimethylformamide, stirred at room temperature to make a uniform mixing reaction, terephthalic acid is added, stirred sufficiently to dissolve, and then placed in a reactor for heating reaction, solid-liquid separation is performed after the reaction is completed, and a solid product is collected, washed, and dried to obtain a graphene-supported Ni-MOF hydrogen storage catalyst, which is named G@Ni-MOF. The graphene-supported Ni-MOF hydrogen storage catalyst proposed in the invention has a simple preparation process and mild reaction conditions, and is expected to be applied to other hydrogen storage systems. The introduction of graphene can effectively improve the catalytic activity of the Ni-MOF catalyst, and the prepared composite catalyst has good thermal stability and can improve the hydrogen storage kinetics of the MgH2 hydrogen storage material.

This invention belongs to the field of material surface treatment technology, specifically relating to a wafer polishing slurry, its preparation method, and its application. The wafer polishing slurry comprises abrasives, oxidants, dispersants, surfactants, pH adjusters, and water. The components of the wafer polishing slurry work synergistically, shortening polishing time and improving polishing efficiency when applied to wafer polishing. Furthermore, it significantly improves the surface quality of the polished wafer, markedly reducing scratches and defects, and lowering surface roughness to below 0.15 nm, thus meeting the surface quality requirements of fields such as power electronics and radio frequency devices.

The invention belongs to the field of electrochemistry, and particularly relates to a metal-sulfur / selenium battery which comprises a positive electrode, a negative electrode, a diaphragm and electrolyte, an active material of the positive electrode is at least one of sulfur, selenium and a sulfur-selenium compound, and the negative electrode is a metal negative electrode; the positive electrode and / or the diaphragm are / is loaded with a targeted electrocatalyst, and the targeted electrocatalyst is one or more of metal sulfide, metal nitride, Prussian blue and analogues thereof, and a perovskite compound. The targeted electrocatalyst material is applied to the metal-sulfur / selenium battery to serve as a functional diaphragm modification material, so that the reaction energy barrier of the speed determining step in the reaction process can be directionally reduced, the reaction kinetics can be accelerated, the efficient conversion of a sulfur / selenium-based positive electrode can be promoted, and the electrochemical performance of the metal-sulfur / selenium battery can be remarkably improved. In addition, the preparation method of the targeted electrocatalyst material is simple and easy to obtain, and the technology has good industrialization potential.

The present application relates to the technical field of positive electrode materials for aqueous zinc ion secondary batteries, and discloses a copper-manganese bimetallic oxide positive electrode material and a preparation method and application thereof. The copper-manganese bimetallic oxide positive electrode material includes Cu x O core, and the Cu coated x O-core MnO 2 Shell; wherein 1<x<2. In this application, Cu x O introduced into MnO 2 system, forming an electrochemically active core-shell two-phase structure, in which the shell MnO 2 Nanosheets grown in situ on Cu x O nanosphere core surface, during the electrochemical reaction, has a conductive Cu x O core promotes H + and Zn 2+ In MnO 2 The insertion and deinsertion in the electrochemical reaction can improve the electrochemical reaction kinetics; while MnO 2 Nanosheets coated with Cu x O core, buffering and inhibiting Cu x The volume expansion and pulverization caused by the O phase conversion reaction improve the specific capacity and charge-discharge cycle stability of the electrode material through the synergistic effect of the core-shell two phases.

The invention provides a method for preparing MoxNy through salt-assisted topological nitridation of molybdenum oxide. The preparation method comprises the following steps: mixing molybdenum oxide and metal salt according to a ratio, putting the mixture into a tubular furnace, carrying out nitridation reaction in an ammonia gas atmosphere, cooling the obtained product, and carrying out acid pickling, water washing and drying to obtain a MoxNy material; the molar ratio of the molybdenum oxide to the metal salt is 1: (15-35). According to the invention, the structure and morphology of the product can be optimized by regulating and controlling different salts to assist nitridation and the molybdenum / salt ratio, and the nitrogen-rich MoN nanobelt and the highly nitrogen-rich Mo5N6 one-dimensional porous nanobelt can be prepared by precise regulation and control. In addition, the high nitrogen-rich type Mo5N6 has excellent high specific capacitance. According to the method, low-cost KCl and NaCl are adopted as salt auxiliary agents, and the obtained nitride is high in purity and controllable in phase; meanwhile, the synthesis process is simple, and batch and large-scale preparation is facilitated.

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

The present invention provides a positive electrode material with dual ion doping and wood ear derived carbon composite modification, and a preparation method and application thereof. The preparation method comprises the following steps: (1) adding NaF, KF, NH4H2PO4, NH4VO3, C4H6MnO4·4H2O and wood ear particles to water in sequence under stirring, and dispersing them evenly to obtain a mixed solution; (2) heating and stirring the mixed solution to obtain a gel state mixture; (3) freeze drying to obtain a freeze-dried gel; (4) grinding and then performing a first calcination; (5) grinding the first calcination product and then performing a second calcination. The positive electrode material with dual ion doping and wood ear derived carbon composite modification of the present invention is Na 3‑x K x V 2‑y Mn y (PO4)2F3@BF can effectively improve the structural stability and cycle stability of the positive electrode material, and the capacity retention rate can reach up to 102.86% after 200 cycles at a 0.2 C rate.

The invention discloses a WS2 / W composite material, a preparation method thereof and application of the WS2 / W composite material in a sodium-sulfur battery. The preparation method comprises the following steps: uniformly stirring isopropanol and acetone to obtain a mixed solution A; weighing tungsten hexachloride, adding the tungsten hexachloride into the mixed solution A, and uniformly stirring to obtain a mixed solution B; transferring into a reaction kettle, sealing and putting into a drying oven for reaction; after the reaction is finished, carrying out suction filtration and washing on a product by using industrial alcohol, and drying in a vacuum oven to obtain W18O49 powder; the method comprises the following steps: weighing W18O49 powder and sublimed sulfur, respectively and correspondingly placing the W18O49 powder and sublimed sulfur in a first porcelain boat and a second porcelain boat, then placing the second porcelain boat in the first porcelain boat, placing the second porcelain boat in a tubular furnace, introducing argon into a furnace chamber of the tubular furnace, after the pressure of the furnace chamber is increased to 0.2-0.3 MPa, keeping the airtightness of the system, heating to 1100-1300 DEG C at the rate of 20 DEG C / min, keeping the pressure at 0.2-0.3 MPa in the heating process, and keeping the temperature for 2-3 hours; and after the temperature reaches 1100-1300 DEG C, continuously preserving heat for 2 hours, introducing argon, cooling to room temperature, and collecting to obtain WS2 / W powder. The problems of poor conductivity of the sulfur positive electrode, polysulfide shuttle effect and slow reaction kinetics are solved.

The invention relates to the technical field of photocatalysts, in particular to a nonmetal plasmon heterojunction material, a preparation method and application thereof and a method for preparing p-aminophenol through reduction of p-nitrophenol. The nonmetal plasmon heterojunction material provided by the invention comprises a C3N4 nanosheet and a WO3-x nanoplate (x is 0.1 to 0.3) positioned on the surface of the C3N4 nanosheet. The WO3-x local surface plasmon characteristic can effectively expand the spectral response range of the non-metal plasmon heterojunction material in a visible region to a near-infrared region, and the light absorption efficiency of the non-metal plasmon heterojunction material is remarkably enhanced. The nonmetal plasmon heterojunction material provided by the invention can realize efficient reduction of p-nitrophenol based on the synergistic effect of an interface heterojunction, a built-in electric field and oxygen vacancies, is high in selectivity, has excellent photocatalytic activity for reduction of p-nitrophenol, and is excellent in photocatalytic activity stability.