45results about How to "Optimize electronic structure" patented technology

The invention relates to the technical field of batteries, in particular to a diaphragm for a battery, a preparation method of the diaphragm and an aqueous sodium-ion battery. The battery diaphragm comprises a diaphragm substrate and a coating arranged on the diaphragm substrate, wherein the coating comprises carbon-coated sodium ferrocyanide, a conductive agent and a binder. The preparation method of the battery diaphragm comprises the following steps: mixing the carbon-coated sodium ferrocyanide, the conductive agent, the binder and the solvent to prepare slurry, coating the slurry on the diaphragm substrate, and drying to obtain the battery diaphragm. The high-performance battery diaphragm is obtained by arranging the modified coating containing the carbon-coated sodium ferrocyanide, the conductive agent and the binder on the conventional diaphragm substrate, and the diaphragm can improve the long cycle stability, the capacity, the coulombic efficiency and the energy density of the battery when being used for the water-based sodium ion battery.

The invention relates to the technical field of capacitor electrode material preparation, in particular to a sulfur-doped nickel-manganese layered double hydroxide electrode material, a preparation method and a capacitor, and the preparation method comprises the following steps: growing sulfur-doped nickel-manganese layered double hydroxide on foamed nickel by using a simple and feasible one-step hydrothermal method; oxygen vacancies are introduced into the electrode material through a safe and harmless chemical reduction method; wherein the layered double hydroxide has a relatively large specific surface area and rich active sites, so that permeation of electrolyte and diffusion of ions are facilitated; through combination of sulfur doping and oxygen vacancy, the electronic structure of the electrode material can be synergistically optimized, and the electrolyte adsorption capacity and the electronic conductivity of the electrode material are enhanced. The problems that in the prior art, due to the fact that transition metal layered double hydroxides are low in electric conductivity and poor in electron transmission efficiency, actual energy density and power density are low, and cycling stability is poor are solved.

The invention discloses a double transition metal / chitosan-based carbon aerogel composite material and a preparation method and application thereof.The method comprises the steps that a nitrogen source and transition metal salt are added into a hydrochloric acid solution of chitosan, stirred, dissolved and evenly dispersed to prepare a mixed solution, the mixed solution is subjected to freeze drying, and the double transition metal / chitosan-based carbon aerogel composite material is obtained. Chitosan aerogel containing transition metal and a nitrogen source is prepared; the transition metal salt is any two of ferric salt, cobalt salt and nickel salt; the chitosan aerogel containing the transition metal and the nitrogen source is placed in a methanol solution of 2-methylimidazole, after vibration treatment and drying, the chitosan aerogel is placed in a nitrogen atmosphere to be subjected to heat treatment, and the double-transition-metal / chitosan-based carbon aerogel composite material is prepared. The preparation method is simple and reasonable in design, the prepared material has good specific surface area and porosity, the formed metal-nitrogen double active center effectively improves the adsorption performance of the material, and the material has good catalytic performance.

The invention provides a silver-cobalt-silicon catalyst for synthesizing ethanol and ethylene glycol through catalytic hydrogenation of dimethyl oxalate and a preparation method of the silver-cobalt-silicon catalyst. The preparation method comprises the following steps: firstly, taking alkaline silica sol as a silicon source, taking soluble cobalt salt as a cobalt source, synthesizing a precursor of cobaltous silicate through an ammonia distillation method, then taking soluble silver salt as a silver source, and introducing a silver element into a cobaltous silicate layer through an impregnation method or the ammonia distillation method to prepare the silver-cobalt-silicon sphere catalyst through a synthesis method. The catalyst has high activity and high stability at a low reaction temperature. According to the novel silver-cobalt-silicon catalyst, the conversion rate of dimethyl oxalate can reach 99.9% in a wide temperature range, ethanol and ethylene glycol products with different proportions can be obtained at different temperatures, the total selectivity of ethanol and ethylene glycol reaches or exceeds 90%, and the novel silver-cobalt-silicon catalyst is suitable for producing ethanol and ethylene glycol products with different proportions according to different requirements.

The invention relates to a preparation method and application of a thermal shock induced ferrocobalt double-doped metastable phase nickel / nickel oxide heterostructure (Co, Fe-Ni / NiO / NF) composite electrode. The preparation method comprises the following steps: cutting and cleaning the foamed nickel substrate; the preparation method comprises the following steps: growing a nickel-cobalt-iron layered double hydroxide nanosheet on a foamed nickel substrate through a constant-voltage deposition method; nickel-cobalt-iron prussian blue analogue nanoparticles grow in situ on the surface of the nickel-cobalt-iron layered double hydroxide nanosheet through an ion exchange method; and preparing the Co, Fe-Ni / NiO / NF composite electrode through a thermal shock method. The composite electrode has excellent catalytic activity and stability as a working electrode for hydrogen evolution and oxygen evolution reactions. The composite electrode can be directly used as a cathode and an anode of an anion-exchange membrane electrolytic cell to efficiently catalyze a full-water decomposition reaction at different temperatures, and the electrolytic cell can stably operate for 1000 hours and 240 hours under the current densities of 0.1 A cm <-2 > and 1.0 A cm <-2 > respectively, so that the composite electrode has a good application prospect.

The invention discloses a low-cost alkaline medium oxygen evolution catalyst as well as a preparation method and application thereof, and relates to the technical field of electrochemistry. The preparation method comprises the following steps: step 1, mixing an iron metal source and a cobalt metal source, and preparing a salt solution A with a certain concentration; step 2, washing foamed nickel or a nickel metal source with concentrated hydrochloric acid and deionized water, drying, placing in the salt solution A, and standing for a certain time after ultrasonic treatment; step 3, preparing an alkali solution B with a certain concentration from an alkali solution source; slowly dropwise adding the alkali solution B into the salt solution A to precipitate metal ions; and step 4, taking out the foamed nickel or the nickel metal source in the solution, washing with deionized water and absolute ethyl alcohol, and drying to prepare the oxygen evolution catalyst. The oxygen evolution catalyst disclosed by the invention can be used for preparing a self-supporting OER electrode for catalyzing oxygen evolution, and has the advantages of low cost, high catalytic activity, capability of realizing large-scale production, relatively low environmental influence and the like.

The invention provides a Ce / CuO nanoflower-nanowire heterogeneous electrocatalyst as well as a preparation method and application thereof, and belongs to the technical field of preparation of electrocatalytic materials. According to the preparation method disclosed by the invention, Ce modification is carried out on the CuO nanowires, so that the Ce / CuO nanoflower-nanowire heterogeneous electrocatalyst with a large number of oxygen vacancies is obtained; by doping Ce, more oxygen vacancies appear in the catalyst, and an electronic structure is optimized, so that adsorption of an intermediate is promoted; the catalyst is beneficial to activation and dissociation of interface water, can promote generation of active hydrogen and hydrogenation of reaction intermediates, has good application in the field of electro-catalysis nitrate reduction, and has good practicability.

The invention discloses an acrylamide monomer solution production method which comprises the following steps: adding acrylonitrile, water and immobilized nitrile hydratase into a reaction kettle for hydration reaction to prepare an acrylamide monomer; the reaction kettle comprises a kettle body, a kettle cover is arranged at the upper end of the kettle body, a discharging pipe is arranged at the bottom of the kettle body, a first feeding pipe, a second feeding pipe, a third feeding pipe and a stirring motor are arranged on the kettle cover, a stirring shaft is arranged on an output shaft of the stirring motor, and stirring paddles are distributed on the stirring shaft; an annular distributor is further arranged in the kettle body and comprises a distribution cavity, the upper end of the distribution cavity is connected with an adjusting cavity, a spraying head is arranged in the adjusting cavity and provided with spraying holes communicated with the distribution cavity, the distribution cavity is communicated with the bottom of the kettle body through a circulating pipe, and a circulating pump is arranged on the circulating pipe. According to the method disclosed by the invention, acrylonitrile is hydrolyzed by using the immobilized nitrile hydratase with high stability, so that the problems of relatively poor enzyme stability and relatively high production cost in preparation of acrylamide by an existing biological catalysis method are solved.

The invention discloses a high-porosity and high-electrocatalytic-performance cathode structure and a preparation method thereof.The preparation method comprises the following steps that S1, Ni powder and Al powder in a certain proportion are mixed to be uniform, the mixture is sprayed to the surface of a nickel net through a plasma spraying method, and a NiAl alloy coating is obtained; s2, Al elements in the NiAl alloy coating are removed through a chemical activation treatment method, and a porous nickel structure with high porosity is formed; s3, performing pretreatment operation to remove oil stains and oxides on the surface of the porous nickel structure; and S4, depositing a Mn-doped ZnCoP transition metal phosphide coating by adopting a two-step constant-potential electro-deposition method to obtain the cathode structure. According to the preparation method of the cathode structure, batch preparation can be achieved, the cost advantage is high, the prepared cathode structure has high porosity and high electro-catalytic performance, high stability under the harsh condition is achieved, and the long-term operation requirement for efficient water electrolysis hydrogen production can be met.

The invention discloses a preparation method of a bamboo-like carbon nanotube packaged metal catalyst, which comprises the following steps: carrying out heating reflux treatment on carbon black with dilute acid, washing to neutral, and drying to obtain acid-treated carbon black powder; adding the acid-treated carbon black powder into a glucose aqueous solution, then adding water-soluble metal salt, and ultrasonically mixing uniformly to obtain a metal / carbon chelated black suspension; carrying out hydrothermal reaction on the black suspension at 100-120 DEG C for 8-12 hours, then separating out a black wet solid, washing and drying to obtain black powder, namely the metal-loaded carbon material; and uniformly mixing the black powder and a heteroatom precursor, grinding, and calcining in a tubular furnace under a protective atmosphere to obtain the bamboo-like carbon nanotube packaged metal catalyst. According to the invention, the non-noble metal is completely encapsulated in the carbon nanotube to form a novel composite material with a carbon encapsulated metal structure, so that not only is abundant active sites provided, but also direct contact between metal and oxygen or a solution in a reaction system is effectively prevented, thereby improving the stability and durability of the catalyst.

The invention discloses a preparation method and application of a bimetallic loaded coal gasification ash catalyst, and the preparation method comprises the following steps: S1, grinding, screening, washing and drying ash to obtain an ash carrier; s2, adding metal salt into water, and stirring to obtain a precursor solution; s3, adding the ash carrier into the precursor solution, and stirring to obtain a mixed solution; and S4, adding hydroxide into the mixed solution, carrying out hydrothermal reaction, washing, drying, grinding and calcining to obtain the supported coal gasification ash catalyst. Cheap ash is taken as a carrier, waste resources are reasonably utilized, not only is environmental pollution reduced, but also recycling of the resources is realized, uniform distribution and firm combination of metal ions on the surface of the ash are effectively promoted by adopting a hydrothermal method, the bimetallic loaded coal gasification ash catalyst is synthesized, and the bimetallic loaded coal gasification ash catalyst can be used for treating COD (Chemical Oxygen Demand) in coal chemical industry wastewater. The method has the advantages of high removal rate, stability, application feasibility and the like, and has excellent industrial application potential.

The present invention provides a method for synthesizing a nitrogen-doped tungsten trioxide complete photocatalyst for water splitting. Catalysts of different shapes are obtained within different ranges of the molar ratio of the tungsten precursor to hydroxylamine hydrochloride. The band structure of nitrogen-doped tungsten trioxide is regulated by adjusting the content of the N atom dopant, and the hierarchical structure morphology is controlled to increase the number of active sites and the diffusion and mass transfer capacity of water molecules. The synthesized four different types of nitrogen-doped tungsten trioxide complete photocatalysts for water splitting can effectively meet different requirements for the photocatalytic water splitting rate. Compared with the prior art, the method provided by the present invention significantly improves the solar energy to hydrogen (STH) conversion efficiency of the catalyst for complete photocatalytic water splitting, and the maximum conversion efficiency value can reach 3.8%, and reduces the cost of catalyst materials, which has practical significance for reducing the cost of green hydrogen production. The method provided by the present invention is suitable for large-scale preparation of complete photocatalytic water splitting catalysts.

The invention discloses a nickel-based catalyst and a preparation method and application thereof, and belongs to the field of hydrogen production through water electrolysis. The nickel-based catalyst comprises a foamed nickel substrate material, nano-particles are arranged on foamed nickel, and the nickel-based catalyst has a heterostructure formed by Ni3S2 and Ni9S8 together. The heterostructure is prepared by a one-step hydrothermal method. The preparation method of the nickel-based catalyst comprises the following steps: (1) pretreating foamed nickel to remove impurities on the surface of the foamed nickel; (2) adding a sulfur precursor into deionized water, then adding a cobalt precursor, and stirring until the cobalt precursor is dissolved to obtain a solution; (3) transferring the solution in the step (2) into a reaction kettle, inserting the foamed nickel obtained in the step (1) into the reaction kettle, and carrying out hydrothermal reaction; and (4) after the reaction is finished, cooling to room temperature, and cleaning and drying the foamed nickel. According to the nickel-based catalyst and the preparation method thereof provided by the invention, the effects of low cost, high activity and high stability can be achieved.

The invention discloses a preparation method and application of an ammonia borane alcoholysis hydrogen production catalyst of NiO-CuO / Fe3O4 with a three-phase interface, Fe3O4 microspheres are synthesized by adopting a solvothermal synthesis method, then NiO and CuO are deposited on the surfaces of the Fe3O4 microspheres by adopting a dipping-calcining method, an obtained sample is a heterostructure with the three-phase interface, the three-phase interface is NiO-CuO, CuO-Fe3O4 and NiO-Fe3O4, and the three-phase interface is one of NiO-CuO, CuO-Fe3O4 and NiO-Fe3O4. The electronic structure of the catalyst can be optimized by charge transfer among three-phase interfaces, so that the catalytic performance of the catalyst is improved. In addition, the nickel-copper ratio can be regulated and controlled in the synthesis process to further optimize the components of the catalyst; the whole preparation process is simple to operate, environment-friendly, good in experimental reproducibility, low in cost and easy for industrial production.

The application provides a self-supporting Ni-Fe-Mn oxygen evolution electrocatalyst and a preparation method thereof, and belongs to the technical field of catalytic material preparation. The Ni, Fe and Mn metal raw materials are repeatedly smelted, and after smelting, suction casting is carried out to obtain a cast plate. The cast plate is subjected to homogenization treatment, and then is cut and polished. Finally, etching is carried out in a nitric acid solution to obtain the self-supporting Ni-Fe-Mn oxygen evolution electrocatalyst. The self-supporting electrocatalyst is prepared by the method of arc smelting, heat treatment and chemical etching, and has the advantages of simple preparation process, easy industrialization, adjustable size, excellent stability and excellent OER performance.

The invention belongs to the related technical field of proton exchange membrane fuel cells, and discloses a mesoporous CoNC fiber composite platinum-cobalt alloy catalyst and a preparation method and application thereof.The method comprises the following steps that 1, organic polymers, Co-doped ZIF8, an oxide pore-forming agent and N, N-dimethylformamide are mixed and dispersed evenly to obtain an electrostatic spinning solution, and the electrostatic spinning solution is subjected to electrostatic spinning; a CoNC fiber precursor is prepared through an electrostatic spinning machine, and then the obtained CoNC fiber precursor is carbonized to obtain CoNC fibers; (2) etching the obtained CoNC fiber with an etching solution to obtain a mesoporous CoNC fiber; and (3) dispersing the obtained mesoporous CoNC fibers in a solvent, and loading platinum-cobalt alloy nanocrystals, thereby obtaining the mesoporous CoNC fiber composite platinum-cobalt alloy catalyst. According to the invention, the oxygen transmission resistance of the fuel cell under high current density can be reduced, and the platinum-based nanocrystals in the catalyst are loaded in the mesopores of the carbon carrier, so that the poisoning of ionomers can be avoided.

A heterovalent copper-doped lithium cobalt phosphate cathode material and its preparation method are disclosed, belonging to the technical field of lithium-ion battery cathode materials. The general chemical formula of the heterovalent copper-doped lithium cobalt phosphate cathode material is LiCu. x Co 1‑x PO4, where 0 < x ≤ 0.1; it has an orthorhombic Pnma olivine structure, Co 2+ The cobalt phosphate material occupies the 4c ​​site of the CoO6 octahedron; copper is doped into the lattice as monovalent copper, and heterovalent cobalt sites are substituted. The method is as follows: First, lithium, copper, cobalt, and phosphorus sources are mixed uniformly to obtain a precursor mixture; second, the precursor mixture undergoes a high-temperature solid-state reaction under a protective atmosphere, followed by calcination at 600-800℃ for 4-8 hours; finally, it is cooled to room temperature to obtain the cathode material. This invention successfully activates the electrochemical activity of lithium cobalt phosphate, significantly improving the initial charge-discharge capacity compared to the pure phase; the heterovalent substitution-induced cobalt valence state change helps optimize the electronic structure of the material and improve conductivity; the preparation process helps reduce side reactions and impurity phase formation, is simple, has good reproducibility, and is easy to scale up industrially.

The invention relates to a fast-charging negative electrode material as well as a preparation method and application thereof. The fast charge negative electrode material comprises nitrogen and phosphorus co-doped hard carbon and functionalized carbon nanotubes distributed on the surface of the nitrogen and phosphorus co-doped hard carbon; in the fast-charging negative electrode material, the content of a nitrogen element is 0.70 wt%-6.00 wt%, the content of a phosphorus element is 1.45 wt%-3.00 wt%, and the content of functional groups on the surface of the fast-charging negative electrode material comprises at least one of the following items (1)-(4): (1) 0.05 wt%-0.1 wt% of carboxyl based on oxygen atoms; (2) 0.05 wt% to 0.2 wt% of a carbonyl group; (3) 0.2 wt% to 0.4 wt% of an alkoxy group; and (4) 0.1 wt% to 0.2 wt% of hydroxyl groups. The fast-charging negative electrode material disclosed by the invention has conductivity, specific capacity and structural stability at the same time, and can meet the requirements of high-rate fast-charging batteries.

The invention relates to a preparation method of a high-stability chalcogenide modified Fe-N-C catalyst based on a confinement gas phase migration strategy, which comprises the following steps: S1, etching the Fe-N-C catalyst by using an etching gas decomposed from ammonium chloride at high temperature to obtain a defect-rich Fe-N-C catalyst; s2, the chalcogenide powder and the Fe-N-C catalyst rich in defects are mixed to be uniform, the mixture is placed in a vacuum and closed container, pyrolysis treatment is conducted at the temperature not lower than the temperature at which the chalcogenide powder is converted into chalcogenide steam, the chalcogenide modified Fe-N-C catalyst is obtained, and the chalcogenide powder is sulfur powder or selenium powder or tellurium powder. According to the method, a confinement gas phase migration strategy is adopted, a closed confinement reaction space is constructed, accurate preparation of the sulfur group modified Fe-N-C catalyst is achieved, and the problems that the stability of the Fe-N-C catalyst is insufficient and a volatile element doping process is difficult to control can be effectively solved.

This invention discloses a method for preparing a BiOI-based catalyst, the BiOI-based catalyst itself, and its applications, belonging to the field of carbon dioxide conversion and utilization. It overcomes the problems of insufficient stability and low product yield when BiOI is used as an ECR catalyst in existing technologies. The preparation method of the BiOI-based catalyst of this invention includes the following steps: Step 1, obtaining BiOI; Step 2, mixing the BiOI, a sulfur source, and a first solvent, heating and reacting to obtain S-BiOI powder; the mass ratio of BiOI to the sulfur source is 35.2:(0.25-4). The BiOI-based catalyst of this invention exhibits improved product yield and good stability during the reduction of carbon dioxide to formate or formic acid, maintaining high activity during long-term ECR formic acid production.

The invention relates to the technical field of catalyst preparation, in particular to a preparation method of an In2O3-based finger-shaped photocatalyst, which comprises the following steps: step 1, adding a certain amount of indium source and terephthalic acid into a reactor, then adding N, N-dimethylformamide (DMF), and stirring to completely dissolve the solid to obtain a solution A; 2, the solution A obtained in the step 1 is placed in an oil bath pan for oil bath heating, after the reaction is finished, cooling, filtering, washing and drying are conducted, and solid powder can be obtained; compared with the prior art, the preparation method has the advantages that a solvothermal synthesis technology is utilized, the microstructure of In2O3 is finely regulated and controlled, a unique finger appearance is formed, then iridium monatomic is accurately supported through a wet chemical method, and the density and electron transfer efficiency of photocatalytic active sites are remarkably improved. The obtained catalyst shows excellent gamma-lactam photocatalytic conversion capability under visible light irradiation, and the conversion rate is up to 95% or above.

The present invention discloses a method for preparing a high-performance catalyst using chromium ion pollutants in surface water. After a small piece of nickel foam is pickled with hydrochloric acid and rinsed with alcohol, it is immersed in a ferric nitrate solution to obtain a nickel-iron layered double hydroxide array at room temperature; the nickel-iron layered double hydroxide array is used as a working electrode and catalyst, and the electrolysis of water is directly carried out in an alkaline solution prepared from lake water contaminated by chromium ions. During this process, the chromium ions will be adsorbed on the catalyst material, which has a modification effect. The present invention adopts the above-mentioned method for preparing a high-performance catalyst using chromium ion pollutants in surface water to generate a high-performance electrolysis of water to produce hydrogen and oxygen half-reaction catalyst; the unique structure and electronic state of the catalyst are used to effectively adsorb chromium ion pollutants, which can achieve the effect of simultaneously adsorbing metal ion pollutants in water, reducing pollution, and improving catalyst performance.

The invention belongs to but not limited to the technical field of catalysts, and discloses a preparation method and application of an oxygen evolution catalyst based on jet plasma treatment.The preparation method comprises the steps that a certain amount of lead oxide, ferrous sulfate, nickel nitrate, thiourea and graphene are weighed and added into 10 mL of deionized water; performing ultrasonic treatment at room temperature for 30 minutes to obtain a mixed solution; freezing and drying for 24 hours to obtain a powder sample; weighing a sample, uniformly spreading the sample in a flat-bottom glass container, and placing the flat-bottom glass container in a jet plasma discharge plume area; cutting the foamed nickel, respectively carrying out ultrasonic treatment for 30 minutes by using a 3 mol / L hydrochloric acid solution, ethanol and deionized water, and standing for 12 hours at room temperature; weighing a catalyst, adding the catalyst into ethanol and a 5% wt Nafion solution, and carrying out ultrasonic treatment for 30 minutes to uniformly mix the ethanol and the Nafion solution; and uniformly coating the treated foamed nickel with the solution, and standing at room temperature for 12 hours to obtain the Pb-NiFe / G / NF catalyst.

The invention belongs to the technical field of electrolyzed water catalysts, and discloses an S, V-co-doped porous Ni2P material as well as a preparation method and application thereof. According to the invention, S and V co-doped nickel phosphide S, V-Ni2P / NF is prepared by a hydrothermal-gas-solid phase reaction two-step synthesis method and is used for efficient electrochemical decomposition of water. The S, V-Ni2P / NF electrode grows in situ on the foamed nickel, has a special microflower structure, and shows excellent HER and OER catalytic activity. The excellent performance of S, V-Ni2P / NF is mainly benefited from the special morphological structure and the synergistic effect of S and V co-doping, the electron structure of the catalyst is optimized through anion and cation double doping, the electron structure and electron arrangement of the catalyst are further optimized, the charge transfer rate of the catalyst is increased, and the performance of the catalyst is improved. And the porous microflower structure has a relatively large electrochemical activity specific surface area, and provides sufficient possibility for exposure of more active sites, so that the catalytic activity of the catalyst is improved.

The invention discloses a method for preparing a PdH-coated mC core-shell catalyst and catalyzing phenol to prepare cyclohexanone, which comprises the following steps: S1, dissolving xylose in deionized water, stirring, adding K2PdCl4, and carrying out ultrasonic treatment to obtain a mixed solution; s2, putting the mixed solution in the S1 into a hydrothermal reaction kettle, putting the hydrothermal reaction kettle into a drying oven for hydrothermal reaction, and after the hydrothermal reaction is finished, taking out the hydrothermal reaction kettle and cooling the hydrothermal reaction kettle to room temperature; s3, the solution in the hydrothermal reaction kettle in the S2 is poured out, vacuum drying is performed after centrifugal washing, and the PdH (at) mC core-shell type catalyst is obtained. The catalyst has high catalytic activity and selectivity when used for catalyzing phenol to prepare cyclohexanone, few byproducts are obtained and are easy to treat, the catalyst does not need follow-up treatment, the catalyst can be directly and repeatedly used, and the recycling effect is good. The preparation method disclosed by the invention is simple, and the synthesized core-shell type catalyst is regular in morphology and has relatively good catalyst stability, catalytic activity and reusability.

The invention provides a benzoic acid-doped nickel / cobalt bimetallic MOF-based aqueous battery positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: dipping a porous carrier in a reaction solution for solvothermal reaction to prepare the benzoic acid-doped nickel / cobalt bimetallic MOF-based positive electrode material, the reaction liquid at least comprises Ni < 2 + >, Co < 2 + > and ligands, and the ligands comprise terephthalic acid and benzoic acid. According to the benzoic acid doped nickel / cobalt bimetal MOF-based aqueous battery positive electrode material prepared by the invention, the OER performance and the electrochemical performance of nickel-based MOF are improved, the OER overpotential is 284 mV, the OER overpotential can be stabilized for 22 hours under an alkaline condition, and the current retention rate is close to 100%. The capacity of the positive electrode material reaches 442.96 mAh g <-1 > under the current density of 1 mA cm <-2 > and is far higher than that of most of the existing NiCoMOF positive electrodes, the capacity can still be kept at 229.44 mAh g <-1 > under the high current density of 30 mA cm <-2 >, and the positive electrode material has good rate capability.

The invention discloses a preparation method and application of an N and P modified Ti < 3 > C < 2 > T < x > electrode material, and relates to the field of lithium ion battery negative electrode materials. The preparation method comprises the following steps: 1) uniformly dispersing a prepared Ti < 3 > C < 2 > T < x > material in deionized water, and then performing ultrasonic treatment to obtain a uniform Ti < 3 > C < 2 > T < x > dispersion liquid; 2) adding a compound solution containing N and P into the dispersion liquid, and stirring and mixing; and (3) pouring the mixed solution obtained in the step (2) into a polytetrafluoroethylene reaction kettle lining, carrying out solvothermal reaction, cooling, carrying out centrifugal washing on the obtained sample by adopting deionized water, and carrying out vacuum drying to obtain the N, P-coated Ti3C2Tx material. According to the method, one of urea phosphate, amino trimethylene phosphonic acid and N-bis (phosphine hydroxymethyl) glycine is used as an N and P source, and N and P functional groups are constructed on the surface of the Ti3C2Tx material by adopting a solvothermal method, so that charge distribution on the surface of the material is effectively regulated and controlled, transmission and diffusion of carriers at a material interface are accelerated, the material structure is stabilized, and the lithium ion diffusion performance of the material is improved; the application of the Ti3C2Tx material in the aspect of the negative electrode of the lithium ion battery is promoted.

The invention discloses a nickel ferrite catalytic material as well as a preparation method and application of the nickel ferrite catalytic material with a controllable crystal face, and belongs to the technical field of electro-catalysis. The preparation method comprises the following steps: fixing a conductive substrate in a cavity of a magnetron sputtering coating machine, ensuring that the substrate is parallel to a target surface, and setting a target-substrate distance to be 2-20cm; the cavity of the magnetron sputtering coating machine is pre-vacuumized, and glow cleaning is carried out after inert gas is introduced; nickel ferrite is used as a target material, a nickel ferrite catalytic layer is deposited in situ on the surface of the conductive base material through physical vapor deposition, and the nickel ferrite catalytic material is obtained. According to the method, the magnetron sputtering technology is adopted, the target-substrate distance is changed, effective regulation and control over the nickel ferrite crystal face structure are successfully achieved, and the electronic structure and the surface adsorption / desorption energy barrier of the material can be remarkably influenced by the fine change of the crystal structure; therefore, three bottlenecks of low activity, poor stability and slow dynamics confronted by nickel ferrite as an OER catalyst are synchronously broken through, and key material and technical support is provided for commercial application of an AEM electrolytic cell.

The invention discloses a preparation method of carbon nanofiber loaded platinum-based nanoparticles, which comprises the following steps: 1, heating N, N-dimethylformamide, adding polyacrylonitrile, and stirring to form a solution; 2, adding chloroplatinic acid hexahydrate, nickel nitrate hexahydrate and triphenylphosphine into the solution, and stirring to obtain a precursor solution; 3, performing electrostatic spinning on the precursor solution to obtain a fibrous precursor; 4, freeze-drying the fibrous precursor; and 5, carrying out pyrolysis reduction on the freeze-dried fibrous precursor. The carbon nanofiber loaded platinum-based nano-particles are prepared by adopting a method of combining electrostatic spinning with high-temperature pyrolysis, the carrier with high specific surface area and rich pore structures is obtained, the interaction between the carrier and the platinum-based alloy nano-particles is enhanced, rich catalytic active sites are generated, and the catalytic activity of the platinum-based alloy nano-particles is improved. The oxygen reduction reaction electrocatalytic activity and stability of the PtNi-coated PNCF are improved, and the PtNi-coated PNCF is suitable for being used as an oxygen reduction reaction electrocatalyst of a fuel cell.

The invention discloses a preparation method and application of a PdvFeCoNiZnv LDH high-entropy catalytic material with zinc and palladium double metal vacancies. The preparation method comprises the following steps: dispersing palladium chloride in absolute ethyl alcohol to obtain a solution A; adding ferric chloride hexahydrate, cobalt nitrate hexahydrate, nickel nitrate hexahydrate, zinc nitrate hexahydrate, ammonium fluoride and urea into deionized water, and uniformly mixing with the solution A to obtain a solution B; foamed nickel is placed in the solution B for a hydrothermal reaction, and foamed nickel loaded with PdFeCoNiZn LDH is obtained; and then placing in an alkaline solution, and carrying out heating reaction to obtain the flower-shaped PdvFeCoNiZnv LDH high-entropy catalytic material which is self-assembled by nanosheets with rich zinc and palladium double metal vacancies. The high-entropy catalytic material prepared by the invention shows relatively high mass transfer rate and reaction kinetics in electro-catalysis of HER, further shows excellent electro-catalysis activity and stability, and can be used for electro-catalysis of a water splitting hydrogen desorption catalyst.