228 results about "Hydrogen oxidation" patented technology

The invention relates to a dephosphorization material, a preparation method thereof and a dephosphorization method, belongs to the field of water treatment, and solves at least one of the problems of contradiction between adsorption capacity and structural stability, fast capacity fading, short service life, difficult recovery, higher cost and the like of the existing lanthanum-based dephosphorization material. The phosphorus removal material is a nano-porous carbon-supported lanthanum composite material, and comprises an amorphous nano-porous carbon matrix, an amorphous nano-porous carbon carrier, an amorphous nano-porous carbon carrier, and an amorphous nano-porous carbon carrier, and an active component embedded in situ in the nanoporous carbon matrix; wherein the active component comprises lanthanum oxide and / or lanthanum hydroxide. According to the invention, the adsorption capacity is high, the structure is stable, the attenuation of the adsorption capacity is delayed, the service life is prolonged, the cost is reduced, and the adsorbent can be recycled.

The invention discloses a method for preparing a sulfur-doped nickel hydroxide-based self-supporting electrolyzed water anode, and belongs to the technical field of preparation of electrolyzed water catalytic electrodes, and the method comprises the following steps: S1, preparing strong oxidizing salt, thiourea and transition metal salt into an active solution; s2, pretreating the nickel-containing metal substrate to obtain a precursor; and S3, immersing the precursor in an active solution for ultrasonic impregnation, and performing in-situ oxidation to prepare the sulfur-doped nickel hydroxide-based self-supporting electrolytic water anode. According to the method for preparing the sulfur-doped nickel hydroxide-based self-supporting electrolytic water anode, an oxidizing agent-thiourea-transition metal salt synergistic reaction system is adopted, an ultrasonic-assisted technology is combined, and a high-performance catalytic layer is directly grown on the surface of the metal substrate in situ at room temperature; the invention aims to synchronously realize high catalytic activity, excellent stability and macro preparation of the electrode and fundamentally solve the core pain points of long process, high energy consumption, difficulty in amplification and the like in the prior art.

The invention belongs to the field of PET (polyethylene glycol terephthalate) plastic waste treatment, and particularly relates to preparation of a copper oxide-nickel hydroxide core-shell structure catalytic material and application of the copper oxide-nickel hydroxide core-shell structure catalytic material to preparation of high-added-value formic acid by upgrading electro-catalysis PET plastics, and the preparation method comprises the following steps: (1) placing a copper conductive substrate in an alkali etching mixed solution for alkali etching treatment, obtaining a conductive substrate on which a Cu (OH) 2 precursor grows; (2) placing the conductive substrate on which the Cu (OH) 2 precursor grows in a muffle furnace for heat treatment to obtain a conductive substrate on which CuO nanowires grow; and (3) placing the conductive substrate on which the CuO nanowire grows in a hydrothermal kettle, and obtaining the CuO-coated Ni (OH) 2-x core-shell structure catalyst through a hydrothermal method.

The invention relates to the field of preparation of nano materials, in particular to a preparation method of a metal-oxide cluster electro-catalytic material based on an ammonia-mediated electrostatic adsorption principle, and aims to solve the problem that a metal-oxide cluster heterogeneous interface is difficult to accurately construct by an existing method. The preparation method comprises the following steps: dispersing a carbon carrier, a soluble inorganic compound containing platinum, ruthenium and rhodium, a soluble metal complex anion salt and dopamine hydrochloride in a water-alcohol mixed solution, adding ammonia water, and preparing a metal-oxide heterogeneous cluster precursor through an ammonia-mediated electrostatic adsorption effect; and pyrolyzing the precursor in a reducing atmosphere to prepare the metal-oxide cluster electro-catalytic material. The prepared electro-catalytic material has a definite heterogeneous cluster interface and has excellent performance in alkaline hydroxide reaction. The method is simple and convenient to operate, low in cost and low in energy consumption, can be popularized to various metal-oxide cluster electro-catalytic materials, and has application potential.

This invention relates to a hydrogen-form ZSM-48 molecular sieve, its synthesis method, and its applications. The hydrogen-form ZSM-48 molecular sieve has an average mesopore size of 6 nm to 30 nm, a B / L acid ratio of 0.7 to 3.4, and a specific surface area of ​​100 m². 2 / g~500m 2 / g. The synthesis method of the hydrogen-form ZSM-48 molecular sieve includes the following steps: (1) Under contact conditions, silicon source, aluminum source, template agent and water are mixed evenly to obtain a gel; (2) The gel obtained in step (1) is subjected to hydrothermal crystallization treatment, and then washed, dried and calcined to obtain hydrogen-form ZSM-48 molecular sieve. The template agent in step (1) includes hexamethylammonium hydroxide and urea; preferably, the template agent also includes urease. The synthesis method controls the molecular sieve pore size and B / L acid ratio by introducing urease and using a two-stage hydrothermal treatment method, thereby realizing the control of molecular sieve properties according to the target reaction characteristics, which is beneficial to improving the yield of low-branched isoalkanes and improving the quality of lubricating oil base oil.

This invention discloses a platinum-based catalyst for the hydrogenation reaction, its preparation method, and an electrode. The catalyst uses orthorhombic niobium pentoxide (T-Nb₂O₅) as a support to support the active component platinum. The support is resistant to strong acids and electrochemical corrosion at potentials above 1.0 V (vs RHE). The catalyst exhibits a hydrogenation reaction current density of not less than 200 mA·cm⁻¹ at 0.45 V (vs RHE). ‑2 In preparation, ammonium niobate oxalate hydrate was used as the niobium source, and the mixture was gelled via a sol-gel method. The gel was then heat-treated at 600-700℃ to obtain an orthorhombic niobium pentoxide support. The pH was adjusted to less than 3, and platinum was reduced with sodium borohydride to prepare the catalyst. This catalyst was then used to fabricate a hydrogen depolarization anolyte gas diffusion electrode with a platinum loading of 0.5-1.0 mg·cm³. ‑2 It can operate continuously and stably for no less than 120 hours with a cell voltage in the range of 1.25-1.45V. The catalyst of this invention has high activity and excellent stability, and can be used as a hydrogen depolarization anode in hydrometallurgy, significantly reducing electrolysis energy consumption and making it suitable for industrial applications.

The invention discloses a preparation method of high-purity Nb2O5, belongs to the field of preparation of Nb2O5, and solves the problem of low purity of Nb2O5 prepared by the existing method. The preparation method comprises the steps that a metal niobium ingot with the purity larger than or equal to 99.999% is adopted, and vacuum drying is conducted after surface peeling, dilute nitric acid ultrasonic cleaning and high-purity water flushing are conducted; the pretreated niobium ingot is subjected to a hydrogenation reaction in a pure hydrogen atmosphere, niobium hydride is generated and then crushed, and niobium hydride powder is obtained; carrying out dehydrogenation treatment on the niobium hydride powder under a high vacuum condition; dissolving the metal niobium powder with electronic-grade hydrofluoric acid, and filtering to obtain fluorine niobic acid filtrate; performing multi-stage counter-current extraction and reverse extraction on the fluobiobic acid filtrate by adopting an extracting agent to obtain fluobiobic acid reverse extraction liquid; introducing high-purity ammonia gas into the fluobiobic acid strip liquor, and precipitating to generate niobium hydroxide; ageing, filtering and washing with high-purity water for multiple times to obtain a niobium hydroxide filter cake; and calcining the niobium hydroxide filter cake in a high-purity oxygen atmosphere in stages to obtain niobium pentoxide. The niobium pentoxide prepared by the method disclosed by the invention is high in purity.

This invention discloses a method for preparing tin dioxide powder by freeze-drying to inhibit tin hydroxide agglomeration. The method involves adding a tin source solution (36-54 g / L) and a precipitant solution (5-30 g / L) at a mass ratio of 1:0.1-0.25 under constant temperature and magnetic stirring. The precipitant solution is then added dropwise to the tin source solution, reacting to form tin hydroxide colloid. After static aging, the colloid undergoes rapid cryogenic freezing to instantly freeze it into an ice state. The ice-state colloid is then subjected to low-temperature vacuum sublimation drying to obtain loose tin hydroxide dry powder. The dry powder is then calcined to obtain tin dioxide powder. This invention fundamentally eliminates the agglomeration of tin dioxide powder, resulting in tin hydroxide dry powder with an agglomeration rate of less than 10% and a purity of over 99.9%, providing a high-quality precursor for high-performance electronic-grade tin dioxide.

This invention provides a method for producing high-purity aluminum-niobium-tantalum master alloys and co-producing ammonium fluoride, belonging to the fields of metallic materials and inorganic chemicals. The invention involves mixing fluoroniobic acid, fluorotantalic acid, and ammonia water for a precipitation reaction to obtain a precipitate and an ammonium fluoride solution. The ammonium fluoride solution is then concentrated, cooled for crystallization, dehydrated, and dried sequentially to obtain ammonium fluoride. The precipitate is then dried and oxidized and calcined sequentially to obtain an oxide. The oxide, aluminum powder, potassium chlorate, and calcium fluoride are mixed and subjected to a vacuum aluminothermic reaction to obtain the high-purity aluminum-niobium-tantalum master alloy. This invention, considering both broadening the range of raw material selection and optimizing the production process, reacts fluoroniobic acid, fluorotantalic acid, and ammonia water to produce niobium hydroxide and tantalum hydroxide precipitates, which are then oxidized and calcined to form niobium and tantalum oxides. The high-purity aluminum-niobium-tantalum alloy is then prepared using a vacuum aluminothermic reaction. Simultaneously, ammonium fluoride can be co-produced, resulting in high raw material utilization.

This invention discloses a proton exchange membrane hydrogen pump anode and its application. The anode includes an anode sheet and a catalyst composited on the anode sheet. The catalyst includes a support and a first metal and a second metal composited on the support. The first metal is selected from one or more of platinum, iridium, palladium, and ruthenium; the second metal is selected from one or more of iron, cobalt, nickel, molybdenum, and vanadium. The first metal serves as the main active center for the hydrogen oxidation reaction, and the second metal can regulate the electronic structure of the first metal, thereby reducing the adsorption of carbon monoxide at the active site or promoting its oxidative removal. The synergistic effect of the two metals allows the anode containing the catalyst to maintain high hydrogen oxidation activity and stability in hydrogen fuel containing carbon monoxide, thereby improving the carbon monoxide poisoning resistance of the proton exchange membrane hydrogen pump containing the anode.

The invention belongs to the technical field of hydrogen fuel cells, and particularly relates to an anode catalyst layer applied to a fuel cell and a preparation method and application of the anode catalyst layer. The anode catalyst layer for the fuel cell comprises a water electrolysis layer and a hydroxide layer which are overlapped, and the hydroxide layer is in contact with a proton exchange membrane of the fuel cell; the water electrolysis layer comprises a water electrolysis catalyst, carbon powder and first perfluorinated sulfonic acid resin; the hydroxide layer comprises a hydroxide reaction catalyst and second perfluorinated sulfonic acid resin; the ion exchange equivalent EW1 of the first perfluorinated sulfonic acid resin is less than or equal to the ion exchange equivalent EW2 of the second perfluorinated sulfonic acid resin. The anode catalyst layer for the fuel cell has the beneficial effects that through the gradient design of the hydrophilic and hydrophobic properties of the water electrolysis layer and the hydroxide layer, the antipole resistance of the anode catalyst layer is remarkably improved, the performance attenuation degree after antipole is reduced, and the service life of the fuel cell is prolonged.

This invention discloses a Se-doped Pt-based catalyst, its preparation method, and its application, relating to the field of catalyst technology. The preparation method of the Se-doped Pt-based catalyst includes the following steps: (1) mixing conductive carbon black and selenium dioxide powder uniformly to obtain a mixture; (2) heating the mixture to 250-350℃ under an inert atmosphere and holding for 0.5-2 h; (3) subsequently heating to 950-1100℃ and holding for 0.5-2 h to obtain powder A; (4) dissolving a platinum source in water to obtain solution B, then adding powder A to solution B and mixing uniformly, followed by rotary evaporation, grinding, and heating in a mixed atmosphere of H2 and Ar to obtain the Se-doped Pt-based catalyst. The Se-doped Pt-based catalyst prepared by the method of this invention exhibits high catalytic activity and stability in the hydrogenation reaction.

To provide a method for producing a new ferrite quantum dot different from a conventional one.SOLUTION: A method for producing ferrite quantum dots, the method comprising the steps of preparing a mixed solution in which at least ferrous hydroxide is present in water at 0 °C or higher and 30 °C or lower, preparing a green rust-containing suspension by oxidizing the mixed solution to form green rust crystals in the mixed solution, synthesizing ferrite quantum dots in the suspension by raising the temperature of the suspension to 50 °C or higher and 100 °C or lower in an oxygen-free stream, and collecting the ferrite quantum dots in the suspension.SELECTED DRAWING: None

This invention belongs to the field of secondary utilization technology of metal resources, specifically relating to a method for treating waste liquid from electroplating zinc-nickel alloys. The method includes the following steps: S1, mixing the waste liquid from electroplating zinc-nickel alloys, oxygen, and a catalyst, and performing an oxidation reaction to obtain an intermediate liquid and nitrogen; the oxidation reaction temperature is ≥220℃; S2, adjusting the pH of the intermediate liquid to 13.0-13.5, performing a first filtration separation to obtain nickel hydroxide sludge and filtrate 1; S3, adjusting the pH of filtrate 1, performing a second filtration separation to obtain zinc hydroxide sludge and filtrate 2. This invention first degrades COD to obtain zinc and nickel ions; adjusting a specific pH value generates nickel hydroxide sludge, with zinc ions existing in the system as polyhydroxy zinc anions, achieving separation of nickel and zinc; further adjusting the pH separates zinc from the system as zinc hydroxide sludge precipitate. The operation is simple, with high separation efficiency and high purity.

This application belongs to the field of rare earth element recovery technology and discloses a method for recovering scandium oxide from scandium-oxalic acid-containing wastewater. The method involves first mixing a phosphoric acid extractant and a solvent oil to obtain a first mixture. The scandium-oxalic acid-containing wastewater is then filtered. The first mixture is mixed with the filtered scandium-oxalic acid-containing wastewater at a volume ratio of organic phase to aqueous phase of 1:20-30. The mixture is then subjected to countercurrent extraction, stirring, and clarification to obtain a second mixture. Subsequently, the organic phase in the second mixture is back-extracted using an alkaline solution containing ethanol to obtain scandium hydroxide. Scandium hydroxide is then dissolved in hydrochloric acid solution, and finally, scandium is precipitated using oxalic acid solution to obtain scandium oxalate. The scandium oxalate is then calcined at high temperature to obtain scandium oxide. Through the above design, the scandium oxide recovery rate of this application reaches 97.9%, and the scandium oxide recovered by this method has a purity of not less than 99.5%.

The invention belongs to the field of sealing materials, and discloses a high-pressure-resistant hydrogen embrittlement-resistant metal rubber composite sealing material and a preparation method thereof. The high-pressure-resistant and hydrogen-embrittlement-resistant metal rubber composite sealing material comprises a titanium alloy base material, a metal rubber layer and a metal rubber layer which are sequentially stacked from bottom to top, the titanium oxide layer is generated on the surface of the titanium alloy base material in situ; and the rubber layer is adhered to the surface of the titanium oxide layer through hot pressing treatment. The invention further discloses a preparation method of the high-pressure-resistant and hydrogen-embrittlement-resistant metal rubber composite sealing material, and the hydrogen-embrittlement-resistant metal rubber composite sealing material which can still keep stable deformation in a high-pressure environment is prepared by constructing the hydrogen-inhibiting oxidation layer and combining surface roughening, laser irradiation treatment and hot pressing treatment. After the high-pressure-resistant and hydrogen-embrittlement-resistant metal rubber sealing material is kept in a 100 MPa high-pressure hydrogen environment for 1000 hours, the tensile strength retention rate is larger than or equal to 88%, the percentage elongation retention rate after fracture is larger than or equal to 80%, and the deformation is smaller than or equal to 0.5%.

A composition of an indium oxide catalyst including an alkali metal dopant and a method for producing an indium oxide catalyst including an alkali metal dopant. The alkali metal dopant can include Li + , Na + , K + , Rb + , Cs + , and Fr + cations. The method for producing an indium oxide catalyst including an alkali metal dopant includes mixing a solution of an indium salt with a base to form precipitated indium hydroxide (100), contacting the precipitated indium hydroxide with a solution including an alkali metal salt to produce an indium hydroxide solution (102), and calcining the indium hydroxide solution to form indium oxide; thereby forming an indium oxide catalyst including an alkali metal dopant (104).

The invention relates to iridium dioxide nano-powder as well as a preparation method and application thereof, the preparation method comprises the following steps: mixing an iridium source solution with alkali liquor to carry out coprecipitation reaction to obtain iridium hydroxide precipitate; mixing a molten medium, the iridium hydroxide precipitate and a solvent to obtain a precursor material, and performing heat treatment to obtain a molten mixture; and dispersing the molten mixture, and performing dialysis and vacuum freeze drying to obtain the iridium dioxide nano-powder. An iridium source is adopted as a raw material, an intermediate product iridium hydroxide precipitate is obtained through a co-precipitation reaction and then mixed with a molten medium for heat treatment to regulate the particle size of the powder and avoid agglomeration, then dialysis impurity removal and vacuum freeze drying are conducted, and the obtained iridium dioxide nano-powder is uniform in particle size, high in specific surface area and high in dispersing performance; as a catalyst, the catalyst has good catalytic performance and is suitable for multiple fields of chlor-alkali industry, electrochemical oxidation, hydrogen energy PEM, fuel cells and the like.

The present invention addresses the main problem of providing a coating agent composition for forming a coating layer that has high transparency, is extremely hydrophilic, and has an antifouling function and an antifogging function even in a low-temperature atmosphere. The present invention also addresses the problem of providing a method for producing the coating agent composition. Further, the present invention addresses the main problem of providing a product having a coating layer in which the coating agent is used.　Provided as means for solving said problems are: a production method for a coating agent composition, the method comprising (A) a step for causing a polymer obtained through polymerization of a silicon alkoxide to coexist with cerium hydroxide and / or cerium oxide to obtain an intermediate composition, and (B) a step for causing the intermediate composition obtained in said step (A) to coexist with an acidic colloidal silica to obtain a coating agent composition; and a coating agent composition comprising a polymer obtained through polymerization of a silicon alkoxide, cerium hydroxide and / or cerium oxide, and an acidic colloidal silica.

The invention provides a method for preparing high-purity hafnium oxide by an alkali fusion crystallization method, which comprises the following steps: melting a hafnium oxide raw material, solid alkali and a fluxing agent to obtain an alkali fusion clinker; adding the alkali fusion clinker into deionized water, leaching and filtering to obtain hafnium hydroxide precipitate; adding the hafnium hydroxide precipitate into concentrated sulfuric acid to obtain a hafnium sulfate solution; adding hydrogen peroxide into the hafnium sulfate solution for oxidation pretreatment; evaporating, concentrating and crystallizing the hafnium sulfate solution subjected to oxidation pretreatment to obtain hafnium sulfate crystals; adding the hafnium sulfate crystal into concentrated hydrochloric acid, refluxing, evaporating, concentrating and crystallizing to obtain a hafnium oxychloride crystal; dissolving the hafnium oxychloride crystal in water, and adding oxalic acid to generate hafnium oxalate precipitate; and calcining the hafnium oxalate precipitate. According to the process, the purity of hafnium oxide is improved to 99.995% or above, the impurity content is lower than 10 ppm, and the process is short, low in cost and environmentally friendly.

The application discloses an amperometric current density stable MoS2 / Ni3S4 / CFP electrocatalyst and a preparation method and application thereof, and belongs to the technical field of electrocatalytic hydrogen evolution. The application constructs a heterojunction interface between MoS2 and Ni3S4 through a hydrothermal reaction, and MoS2 and Ni3S4 generate a heterojunction on a carbon paper substrate to obtain the amperometric current density stable MoS2 / Ni3S4 / CFP electrocatalyst. The preparation of the composite material comprises the following steps: (1) dissolving nickel salt, urea and ammonium fluoride in water, stirring, and then placing the obtained mixed solution A and carbon paper in a hydrothermal reaction kettle for one-time hydrothermal reaction to obtain a nickel hydroxide precursor; (2) dissolving molybdenum salt and thiourea in water, stirring, and then placing the obtained mixed solution B and the nickel hydroxide precursor in the hydrothermal reaction kettle for two-time hydrothermal reaction to obtain the catalyst. The catalyst improves the electron transfer rate, increases the number of active sites, and exhibits excellent hydrogen evolution reaction activity and stability in the water electrolysis process.

To provide a new method for producing quantum dots of an iron-containing sulfide different from a conventional one.SOLUTION: A method for producing quantum dots of an iron-containing sulfide includes a step of preparing a mixed solution in which at least ferrous hydroxide is present in water at 0 °C or higher and 30 °C or lower, a step of preparing a green rust-containing suspension by oxidizing the mixed solution to form green rust crystals in the mixed solution, and a step of raising the temperature of the suspension to 50 °C or higher and 100 °C or lower in an oxygen-free stream. A method for producing iron-containing sulfide quantum dots, the method comprising: synthesizing the ferrite quantum dots in the slurry; collecting the ferrite quantum dots in the slurry; and treating the ferrite quantum dots with hydrogen sulfide gas at 110 °C. or more and 150 °C. or less to substitute sulfide ions O2 - for oxide ions S2 - in the ferrite, thereby producing iron-containing sulfide quantum dots.SELECTED DRAWING: Figure 1

This invention provides a manufacturing method that allows for the production of a single phase of rutile-type titanium dioxide even under manufacturing conditions where the molar ratio of Ti to Sn (Ti / Sn) is high (i.e., the Sn content is low). [Solution] A method for producing rutile-type titanium dioxide comprising the following steps. (1) A gelatinization step in which hydrogen peroxide is added to an aqueous dispersion of titanium hydroxide gel, and the molar ratio of Ti to hydrogen peroxide (H2O2 / Ti) is adjusted to 15 or more to obtain a gelatinization solution. (2) A tin addition step in which a tin source is added to the gelatinizing solution and the molar ratio of Ti to Sn (Ti / Sn) is adjusted to 16 to 80 in order to obtain a hydrothermal treatment precursor. (3) Crystallization step of hydrothermally treating the hydrothermal treatment precursor to obtain rutile-type titanium oxide

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

The present disclosure relates to a noble metal single atom or cluster-porous molybdenum carbide / carbon nanocomposite using dynamic arrangement of noble metal single atoms or clusters, a method for preparing the same, a catalyst for hydrogen evolution reaction or hydrogen oxidation reaction including the same, and an electrode including the catalyst. The noble metal single atom or cluster-porous molybdenum carbide / carbon nanocomposite of the present disclosure, which is prepared by uniformly bonding a noble metal catalyst only on molybdenum carbide in the form of single atoms or clusters in atomic scale through selective dynamic arrangement, may have remarkably improved catalytic activity and kinetic characteristics since the utilization of the noble metal is improved through selective dynamic arrangement of the noble metal catalyst, may have high stability due to strong interaction between the noble metal catalyst and the molybdenum carbide, and may have high tolerance to carbon monoxide.In addition, the use of the noble metal can be decreased and the nanocomposite can be used as a catalyst for electrochemical hydrogen evolution reaction (HER) or hydrogen oxidation reaction (HOR) under acidic and basic conditions because it has superior catalytic activity, high stability and high tolerance to carbon monoxide. Furthermore, it can be prepared at low cost by a simple synthesis method and has good commercial viability.

This invention provides an application of a 1,4-phenylenediol-modified titanium dioxide / nickel hydroxide heterojunction catalyst as a membrane coating material in lithium-sulfur batteries, belonging to the field of lithium-sulfur battery technology. The catalyst is constructed using a transition metal oxide heterojunction TiO2 / Ni(OH)2 as a substrate, modified by in-situ growth of the sulfur-containing organic compound 1,4-phenylenediol on its surface. This design, through the synergistic effect of the TiO2 / Ni(OH)2 heterojunction and the organic sulfur compound, significantly enhances the physicochemical adsorption and catalytic conversion efficiency of lithium polysulfides, thereby effectively suppressing the shuttle effect and improving battery cycle stability and reaction kinetics. This invention not only provides an efficient solution to the polysulfide shuttle problem but also offers a feasible path for the commercial application of lithium-sulfur batteries under high sulfur loading and low electrolyte conditions, which is of great significance for promoting the development of high-energy-density energy storage systems.

The device comprises a power supply and more than two three-motor electrolytic tanks which are connected in series, each three-motor electrolytic tank comprises an electrolyte storage tank, a hydrogen production catalytic electrode, a nickel hydroxide electrode and an oxygen production catalytic electrode are arranged in the electrolyte storage tank, and the hydrogen production catalytic electrode, the nickel hydroxide electrode and the oxygen production catalytic electrode are arranged in the electrolyte storage tank. Wherein the nickel hydroxide electrode of the first electrolyte storage tank is respectively communicated with the positive electrode and the negative electrode of a power supply through a single-pole double-throw switch and a circuit, and the nickel hydroxide electrode of one group of electrolyte storage tanks is communicated with the hydrogen production catalytic electrode and the oxygen production catalytic electrode of the other adjacent group of electrolyte storage tanks through the single-pole double-throw switch; and the hydrogen production catalytic electrode and the oxygen production catalytic electrode of the tail electrolyte storage tank are respectively communicated with the positive electrode and the negative electrode of the power supply through two groups of single-pole double-throw switches. The device has the advantages of high hydrogen production purity, low cost and easiness in series-parallel integration and operation.

The invention discloses a method for efficiently refining a cobalt nickel hydroxide intermediate product, and relates to the technical field of hydrometallurgy, the method comprises the following steps: step S1, alkaline pressurized oxidation; s2, carrying out solid-liquid separation and washing; s3, normal-pressure acid leaching is conducted, specifically, the oxidized cobalt nickel hydroxide intermediate product in the step S2 is subjected to normal-pressure leaching with sulfuric acid, and finally solid-liquid separation is conducted to obtain Ni / Co-containing leaching liquid and Mn-containing leaching residues; s4, neutralization and impurity removal, wherein the oxidized cobalt nickel hydroxide intermediate product obtained in the step S2 is added into the leachate obtained in the step S3 to serve as a neutralizer and an oxidizing agent; and S5, SO2 is subjected to low-temperature pressurization reduction leaching. According to the method, the alkaline pressurized oxidation and normal-pressure acid leaching processes of the nickel-cobalt hydroxide intermediate product are adopted, a series of problems of long subsequent manganese separation process, large wastewater discharge and the like caused by synchronous leaching of nickel, cobalt and manganese in the leaching process of the nickel-cobalt hydroxide intermediate product are solved, and favorable conditions are created for simplifying the refining process of the nickel-cobalt hydroxide intermediate product and reducing the production cost.

According to the preparation method, cerium hydroxide with positive charges and without charge treatment on the surface is subjected to ultrasonic oscillation, so that a polymer or monomer containing negative charges and cerium hydroxide particles form coordinate bonds, first layer coating on the surface is realized, and surface charges are reversed into negative charges. Coating for the second time, adding a polymer with weak positive charges, polymerizing ion pairs through charge attraction, realizing secondary charge reversal and changing into positive charges. The invention discloses a method for repeatedly coating the surface of a cerium hydroxide particle, the electrical property of the coated cerium hydroxide particle is not changed, and the defect, namely particle adhesion, generated by mechanical force in the polishing process can be greatly reduced, so that the yield of a product is improved.