123results about "Nickel sulfides" patented technology

The invention provides a method for preparing an iron-chromium electrolyte and electronic-grade ferrous chloride by using a stainless steel waste liquid. The method comprises the following steps: firstly, adding elemental iron and / or elemental chromium into the stainless steel waste liquid to obtain a chromium-containing ferrous chloride solution; then, sulfide is added, and nickel is removed; adding iron powder to increase the pH value to obtain chromium hydroxide precipitate and a ferrous chloride solution; dissolving chromic hydroxide in hydrochloric acid to obtain a chromic chloride solution; purifying the ferrous chloride solution to obtain an electronic-grade ferrous chloride crystal; and finally, adding a chromium chloride solution, the electronic-grade ferrous chloride crystal and hydrochloric acid according to a certain proportion, and stirring and mixing to obtain the iron-chromium electrolyte. The ferrous chloride prepared by the steps is relatively high in purity and less in waste; meanwhile, the prepared electrolyte is good in electrical property, low in attenuation rate and low in cost, the purpose of comprehensive recycling of resources is achieved, and the general trend of technical improvement is met.

The invention provides an electrolyzed water catalyst as well as a preparation method and application thereof. The electrolyzed water catalyst comprises graphene, MxSy and platinum group metal single atoms, and the preparation method comprises the following steps: firstly, carrying out hydrothermal reaction on raw materials of graphene and MxSy to obtain a first intermediate catalyst; and then coating a second solution containing the first intermediate catalyst on the surface of a substrate, performing plasma irradiation, and then treating by adopting a magnetron sputtering method and / or a chemical vapor deposition method to obtain the electrolyzed water catalyst. According to the invention, an MxSy composite structure is constructed on a graphene substrate, and plasma surface modification is supplemented, so that an environment rich in active defect sites is created; according to the present invention, the platinum group metal single atom can be accurately anchored through the magnetron sputtering method and / or the chemical vapor deposition method, such that the platinum group metal loading capacity is significantly reduced so as to reduce the cost, and the intrinsic activity and the stability of the water electrolysis catalyst are improved.

The present disclosure relates to the technical field of sodium-ion batteries. Disclosed are a preparation method for and use of a sodium-ion battery negative electrode material. The method comprises: dropwise adding ammonia liquid into a mixed solution containing a tin salt and a nickel salt, and heating for reaction to obtain NiSn(OH)6 nanospheres; dispersing the NiSn(OH)6 nanospheres in a solvent, adding thioacetamide, and heating for reaction to obtain flower-shaped nanospheres SnS2-NiS; and mixing the flower-shaped nanospheres SnS2-NiS, biochar, and a binder in water, heating for reaction, carrying out solid-liquid separation, drying an obtained solid, and sintering in an inert atmosphere to obtain the sodium-ion battery negative electrode material.

The invention relates to an electrocatalyst with RuFe nanoparticles cooperating with Ni3S2 and MXene heterojunction and application of the electrocatalyst. The electrocatalyst can be expressed as RuFe / Ni3S2MX / NF. The self-supporting electrocatalyst with a composite structure is prepared in one step through a hydrothermal method, the catalyst has a multi-layer structure, NF serves as a self-supporting framework, the surface of the catalyst is of a heterojunction structure (granular Ni3S2 is wrapped with two-dimensional sheet structure Mxene) composed of Ni3S2 and MXene, and some RuFe nano-particle active sites exist on MXene, so that excellent OER performance is provided. The method is simple to operate, low in preparation and raw material cost and suitable for large-scale application. According to the invention, Ru and Fe are introduced and alloy is formed, so that the OER performance of the catalyst is improved in all directions, the Ru and Fe cooperate with each other to promote formation of RuFe alloy nanoparticles on the surface of a heterojunction, and active sites and specific surface area are increased.

The invention discloses a preparation method of a NiSH nano material, which comprises the following steps: dissolving nickel salt in absolute ethyl alcohol to form a solution A, and dissolving an organic ligand thiosalicylic acid in absolute ethyl alcohol to form an organic ligand solution B; mixing the solution A and the organic ligand solution B, and performing stirring reaction to obtain a mixed solution C; the mixed solution C and deionized water are mixed and stirred, guest molecules are added, stirring continues to be conducted, heating reaction is conducted, after the reaction is finished, products are collected and cleaned through centrifugation, the products are dried away from light, and the NiSH nanometer material is obtained, and the guest molecules are 4-fluorosalicylic acid, 4-trifluoromethylsalicylic acid or 4-bromosalicylic acid. According to the application of the NiSH nanometer material in the water-based nickel-zinc battery, the NiSH nanometer material is prepared into electrode slurry, the surface of carbon cloth is coated with the electrode slurry, and the electrode slurry is used as an electrode plate of the water-based nickel-zinc battery after being dried. The NiSH nano material prepared by the method has high conductivity and cycling stability, and the electrochemical performance of the aqueous nickel-zinc battery can be improved.

The invention relates to the technical field of preparation of composite nanowires, in particular to a nickel sulfide titanium dioxide composite nanowire as well as a preparation method and application thereof. The preparation method comprises the following steps: taking a nickel-containing titanium-based nanowire obtained by carrying out ion exchange on a nickel element Na2Ti3O7 nanowire as a raw material; the nickel-containing titanium-based nanowire is mixed with sublimed sulfur, and then the nickel sulfide / titanium dioxide composite nanowire is prepared through a two-step heating process. The nickel sulfide / titanium dioxide composite nanowire obtained through the technical scheme is regular in morphology, and nickel sulfide and titanium dioxide are evenly distributed; adsorption of the lithium-sulfur battery positive electrode carrier to a discharge intermediate product can be effectively enhanced, conversion of the discharge intermediate product is accelerated, the electrochemical performance of the lithium-sulfur battery is improved, and meanwhile, the process for preparing the polar transition metal compound material with the high specific surface area and the high activity is simple, and production is easy.

The invention relates to the technical field of etching waste liquid treatment, and provides a nickel-containing etching waste liquid treatment method which comprises the following steps: 1, neutralizing and extracting copper; step 2, nickel deposition; step 3, evaporative crystallization; wherein the step I specifically comprises the following steps: slowly adding sodium bicarbonate into the nickel-containing waste liquid, stirring to adjust the pH value of the waste liquid to weak acidity, preferentially forming a basic cupric carbonate Cu2 (OH) 2CO3 precipitate when Cu < 2 + > is within the pH value range, and stably remaining Ni < 2 + > in the solution, and carrying out operations such as filtering separation and the like; and the step 2 specifically comprises the treatment of adding sodium hydroxide into the nickel-containing filtrate from which most of copper is removed to adjust the pH value to be neutral and the like. According to the technical scheme, the problems that according to an existing nickel-containing etching waste liquid treatment method, the harmless treatment effect is achieved in a chemical precipitation mode, the main purpose is to stabilize solid nickel, although the emission requirement is met, the waste liquid still contains copper, soluble salt and other components, and huge resource waste is caused by direct emission are solved.

The invention discloses a preparation method of a NiS / NiSe2 heterojunction containing a non-interface Ni vacancy. The preparation method comprises the steps of precursor preparation and in-situ selenylation treatment. The invention further discloses the NiS / NiSe2 heterojunction containing the non-interface Ni vacancy. The NiS / NiSe2 heterojunction containing the non-interface Ni vacancy is prepared through the method.

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

The invention discloses a resourceful treatment method for stainless steel pickling waste liquid and waste water. The waste liquid is divided into high-concentration waste liquid and low-concentration waste liquid according to the acid concentration and the salt concentration to be treated respectively. Sequentially recovering gypsum, chromic hydroxide, nickel sulfide, ferrous hydroxide and manganese-rich slag from the low-concentration waste liquid through gradient precipitation; and neutralizing free acid from the high-concentration waste liquid by using ferrous hydroxide generated in a low-concentration section, cooling and crystallizing to recover ferrous sulfate, deeply removing nickel by using nickel sulfide generated in the low-concentration section, and precipitating to recover chromium hydroxide. In the whole process, generation of ferric iron is strictly controlled, and high-value productization recovery of free acid and all metals is achieved. The method has the advantages of low medicament consumption, high metal recovery rate, high product value, no secondary pollution and the like.

The invention belongs to the field of nano materials and lithium-sulfur batteries, and discloses a hemp activated carbon loaded nickel disulfide material and application thereof in preparation of a lithium-sulfur battery diaphragm. The preparation method of the China-hemp activated carbon loaded nickel disulfide material comprises the following steps: placing China-hemp stem core powder in a muffle furnace for carbonization to obtain carbonized China-hemp powder; mixing the carbonized China-hemp powder with zinc chloride, activating in an inert atmosphere, and then washing and drying to obtain China-hemp activated carbon HPC; uniformly mixing the obtained HPC with Ni (NO3) 2.6 H2O, absolute ethyl alcohol and water, then uniformly mixing the mixture with a Na2S solution, then introducing the mixture into a reaction kettle for hydro-thermal treatment, suction filtration, washing and drying to obtain NiS2-coated HPC, namely the China-hemp activated carbon loaded nickel disulfide material. The nickel disulfide loaded China-hemp activated carbon powder material is used as a diaphragm modification layer and is coated on a commercial diaphragm by a scraper method, and the electrochemical performance of a lithium-sulfur battery can be effectively improved when the nickel disulfide loaded China-hemp activated carbon powder material is applied to the lithium-sulfur battery.

The present invention discloses a bimetallic sulfide heterojunction modified diaphragm, a preparation method thereof, and an application thereof. The technical solution comprises the following steps: synthesizing a bimetallic sulfide heterojunction material having a three-dimensional flower-like structure constructed by self-assembly of NiS2-WS2 heterojunction nanosheets by a one-step hydrothermal method; then preparing the bimetallic sulfide heterojunction material into a slurry and uniformly coating the slurry on one surface of a commercial polymer diaphragm, thereby finally obtaining a bimetallic sulfide heterojunction modified diaphragm and applying the slurry to a lithium-sulfur battery; the NiS2-WS2 heterojunction in the bimetallic sulfide heterojunction modified diaphragm can improve interfacial activity, increase surface catalytic active sites, optimize the adsorption capacity for polysulfides, and promote catalytic conversion, thereby effectively improving the rate performance and cycle stability of the lithium-sulfur battery.

A method for separating Li from one or more oxides of Co and Ni contained in a feed, comprising the steps of contacting the feed in an aqueous medium with a sufficient amount of a sulfiding agent to convert most of the Co and / or Ni to sulfides and a sufficient amount of a mineral acid to reach a pH of 1-5, thereby forming an aqueous slurry containing solid sulfided Co and / or Ni, and a solution containing Li, and separating the solids from the solution, thereby obtaining a solid containing sulfided Co and / or Ni, and a solution containing at least 70% of Li. This method allows for the conversion of Co and Ni to solid sulfides, while at the same time allowing for their efficient separation from soluble compounds such as Li, Mn and other impurities.

The invention provides a method for preparing a sulfide heterogeneous foam carrier from foam metal and application, and the method comprises the following steps: placing a sulfur source in a porcelain boat, placing the foam metal in another porcelain boat, placing the two porcelain boats in a quartz tube, and placing the quartz tube in a tubular furnace, placing a porcelain boat filled with a sulfur source at the upstream, close to a gas inlet, of a tubular furnace, and placing a porcelain boat filled with foam metal at the center of the tubular furnace; sealing the tubular furnace, continuously introducing inert gas to keep inert atmosphere, and then heating the tubular furnace to 400-800 DEG C for reaction; and after the reaction is completed, continuously introducing inert gas, reducing the temperature of the tubular furnace to room temperature, and taking out a product, namely the sulfide heterogeneous foam carrier.

The invention belongs to the technical field of new materials, and provides a preparation method of high-yield nickel disulfide (NiS2) or a nickel disulfide / sulfur compound (NiS2 / (x-2) S, 3 < = x < = 8) and an application of NiS2 or NiS2 / S in an electrode material. The preparation method comprises the following steps: mixing a nickel ion (Ni < 2 + >) solution with a sodium disulfide (Na2S2) solution or a sodium polysulfide (Na2Sx, x is greater than or equal to 3 and less than or equal to 8) solution, stirring and reacting for 0.5-12 hours, collecting precipitates obtained by reaction, washing and drying to obtain a NiS2 or NiS2 / (x-2) S (x is greater than or equal to 3 and less than or equal to 8) product. The preparation method is simple and easy to operate, low in cost, high in atom utilization rate, green and environment-friendly, high in safety and capable of realizing large-scale industrial production. And when used as an electrode material for a sodium ion battery, the composite material shows good electrochemical performance.

The present invention discloses a metal sulfide-based composite catalyst and a preparation method and application thereof. The metal sulfide-based composite catalyst comprises a MXene substrate and a non-metal atom-doped nickel sulfide nanosheet containing sulfur vacancies loaded on the surface of the MXene substrate. The nickel sulfide nanosheet is doped with non-metal atoms to cause lattice distortion, thereby introducing sulfur vacancies to enhance the ability to capture protons and enhance the reaction activity. At the same time, the nickel sulfide nanosheet is doped with non-metal atoms to increase the number of active sites and improve the conductivity; the sulfur vacancies in the nickel sulfide nanosheet can be used as additional active sites for hydrogen evolution reaction, and at the same time, the electrons are positioned near the defects, which is conducive to the transfer of electrons to proton hydrogen, thereby greatly improving the catalytic performance. There is a synergistic coupling effect between the non-metal atom-doped nickel sulfide nanosheet and the MXene material, which can adjust the electronic structure of the intermediate in the catalytic hydrogen evolution reaction process, reduce its energy barrier, and improve the hydrogen evolution reaction performance.

The application provides a kind of copper sulfide@nickel disulfide positive electrode material based on two-dimensional nanosheet wrapping three-dimensional cube and its preparation method and lithium-magnesium dual-ion battery, first using copper salt, alkaline solution and D (+) -glucose in the water bath condition of 70 DEG C, directional formation Cu2O cube.And then, Cu2O and nickel source, sulfur source and surfactant are synthesized by solvothermal synthesis, forming the structure of two-dimensional and three-dimensional combination of NiS2 nanosheet wrapping Cu2S cube.The two-dimensional and three-dimensional combination structure can shorten the particle transmission path, achieve the effect of fast charging and discharging, at the same time, provide more active sites, increase the specific surface area, fully contact with electrolyte, improve the cycle stability of battery.

The embodiment of the invention relates to a transition metal sulfide graphite composite material as well as a preparation method and application thereof. The method comprises the following steps: dissolving a transition metal compound in a solvent, and mixing and stirring with a graphite raw material to obtain a mixture containing transition metal ions; performing heat treatment on the mixture at 700-1600 DEG C for 10-48 hours, so that a material with a cementite structure is formed in the heat treatment process of the mixture, transition metal ions are gradually diffused into the material, an onion carbon layer is formed on the outer layer of the material, and a primary carbonized material is obtained after crushing and grading; the primary carbonized material is subjected to heat preservation for 1-2 hours at the temperature of 600-2500 DEG C in a protective atmosphere environment, so that transition metal elements in the primary carbonized material escape through pore parts of the material, and a precursor material is obtained; and mixing the precursor material with sulfur powder, heating, and introducing a mixed gas containing a carbon source gas for chemical vapor deposition coating to obtain the transition metal sulfide graphite composite material.

The invention discloses MOF-derived bimetallic sulfide-MXene composite material microspheres and a preparation method and application thereof.The preparation method of the microspheres comprises the steps that MXene nanosheets are weighed according to the mass-to-volume ratio of (1-3): (4-10) and added into a mixed solution, the MXene nanosheets are fully dissolved, and a solution A is obtained; adding cobalt salt and nickel salt with equal molar weight and a composite additive into the solution A, and dispersing to obtain a solution B; transferring the solution B into a reaction kettle, reacting at 150-170 DEG C for 8-12 hours, washing a product after centrifugal precipitation, and carrying out vacuum drying treatment for 8-12 hours to obtain a composite precursor; and putting the composite precursor powder and sulfur powder into a tubular furnace, heating to 500-600 DEG C, carrying out heat preservation reaction, and cooling to obtain the composite material microspheres. The composite material microsphere not only realizes dual regulation and control of nitrogen-doped carbon in-situ modification, but also presents a porous microsphere structure formed by two-dimensional nanosheets, shows good ion conductivity, excellent rate capability and relatively high conductivity in the field of energy storage, and prolongs the cycle life of a sodium ion battery.

The invention discloses a high-performance oxygen evolution reaction composite electrocatalyst and a preparation method thereof, belongs to the field of preparation of electrocatalytic materials, and solves the problem that the performance and repeatability of the prepared electrocatalyst are affected due to the fact that uniform loading and accurate size regulation and control of RuO2 nanoparticles are difficult to realize on a three-dimensional porous complex substrate (foamed nickel). The method comprises the following steps: firstly vulcanizing foamed nickel by using thiourea, and then uniformly depositing RuO2 nanoparticles on the surface of foamed nickel-based Ni3S2 by using an ALD (Atomic Layer Deposition) technology. The size of RuO2 nanoparticles on the surface of the foamed nickel-based Ni3S2 is accurately controlled to be 1.5-3.5 nm through the ALD technology, the surface density is controlled to be 0.8-1.21012 / cm < 2 >, the conductivity and electrochemical activity of the catalyst can be improved, the charge transfer rate can be improved, and the OER performance of the electrocatalyst is improved.

The invention provides a process for generating a metal sulphide comprising nickel and / or cobalt, comprising the steps of: i. forming an aqueous metal sulphate solution by reacting sulphuric acid with a raw material feed comprising nickel and / or cobalt in water; ii. crystallizing said metal sulphate from said aqueous metal sulphate solution to form a crystallized metal sulphate in a mother liquor, the mother liquor comprising an uncrystallized metal sulphate; iii. separating said crystallized metal sulphate from said mother liquor; iv. reacting at least a portion of said uncrystallized metal sulphate with hydrogen sulphide in an acidic aqueous medium, thereby obtaining a slurry consisting of a solid phase comprising a metal sulphide precipitate and an aqueous phase comprising one or more impurities and sulphuric acid; and v. separating said solid phase and said aqueous phase.

The invention relates to the technical field of electrode materials, and particularly discloses a three-dimensional porous carbon composite electrode material and a preparation method thereof. The three-dimensional porous carbon composite electrode material provided by the invention comprises a multi-component metal sulfide core body and an N and S co-doped three-dimensional porous carbon layer coating the surface of the core body, wherein the multi-component metal sulfide core body comprises Mn, Ni, S and C. According to the invention, multi-component metal sulfide is adopted to synergistically inhibit diffusion, form nanoscale pores and relieve volume expansion, and meanwhile, by introducing the N and S co-doped three-dimensional porous carbon layer, more Na < + > adsorption active sites are provided, and the conductivity is enhanced.

The invention discloses a method and a system for purifying a magnesium sulfate solution. The method comprises the following steps: pretreating a magnesium sulfate solution containing nickel and cobalt impurities to remove suspended matters and organic matters in the magnesium sulfate solution; adding sodium hydrosulfide into the pretreated magnesium sulfate solution, enabling nickel and cobalt to respectively react with the sodium hydrosulfide to generate precipitates, and carrying out solid-liquid separation to obtain the purified magnesium sulfate solution and precipitates containing nickel sulfide and cobalt sulfide; evaporating and crystallizing the purified magnesium sulfate solution to obtain magnesium sulfate crystals, and drying to obtain a magnesium sulfate product; and carrying out post-treatment on the precipitate containing the nickel sulfide and the cobalt sulfide, and recovering nickel and cobalt in the precipitate. The method can efficiently remove nickel and cobalt impurities in the magnesium sulfate solution, has the advantages of high efficiency, environmental protection, recoverable resources and the like, and can reduce the production cost and improve the resource utilization rate.

The invention provides nickel sulfide as well as a preparation method, an electrochemical performance test method and application thereof, and relates to the technical field of electrochemical materials. The method comprises the following steps: adding nickel acetate hexahydrate and thioacetamide into a container, adding ultrapure water into the container, and uniformly stirring to obtain a mixed solution; transferring the mixed solution into a reaction kettle, sealing the reaction kettle, putting the reaction kettle into a drying oven, heating the reaction kettle to a first temperature for a first duration, and carrying out a hydrothermal reaction to generate nickel sulfide; and after the hydrothermal reaction is finished, after the reaction kettle is cooled to room temperature, opening the reaction kettle, and washing nickel sulfide in the reaction kettle to prepare nickel sulfide. According to the method, the concentration in nickel sulfide is accurately controlled by regulating and controlling the hydrothermal reaction time, and the electro-catalytic hydrogen evolution performance is improved, so that the performance of the nickel sulfide electrochemical material is optimized.

The invention discloses a heavy metal emission reduction and sludge reduction treatment process method for circuit board wastewater. The invention provides a layered precipitation strategy of'first acid, second alkali and second sulfur '. The method comprises the following steps: performing acid precipitation on alkaline organic wastewater by using acidic wastewater, and recovering printing ink residues; carrying out air stripping treatment on the copper ammonia wastewater by utilizing an alkaline condition, and precipitating high-purity copper hydroxide; and finally, carrying out deep precipitation on residual complexing heavy metals by utilizing excessive sulfides in the pretreatment stage, and further recovering copper resources in the comprehensive water tank through coprecipitation of copper hydroxide and copper sulfide. Sludge generated in each process is classified and treated; printing ink slag, biochemical residual sludge and copper / nickel sulfide sludge are subjected to synergistic pyrogenic process treatment; copper hydroxide sludge is selectively subjected to acid dissolution to prepare copper sulfate. Lime, ferrous sulfate and polyaluminum are not used in the whole process. According to the method, the medicament is utilized to the maximum extent, the sludge is reduced by 50% or above, and the resource value of valuable metal is increased by 3-5 times.

The invention belongs to the technical field of water electrolysis hydrogen production catalysts, and relates to a preparation method of a high-crystallinity self-supporting nickel sulfide nanosheet, which comprises the following steps: 1, dissolving dimethylglyoxime in absolute ethyl alcohol to form a solution A, and dissolving nickel nitrate hexahydrate in deionized water to form a solution B; 2, mixing and stirring the solution A and the solution B to generate nickel dimethylglyoxime precipitate; 3, centrifugally separating the nickel dimethylglyoxime precipitate, and alternately washing with deionized water and ethanol; 4, the purified nickel dimethylglyoxime is dispersed in a mixed solvent composed of deionized water and ethyl alcohol, and a dispersion system is obtained; 5, adding sodium sulfide into the dispersion system, uniformly mixing, and reacting at a constant temperature; 6, after the constant-temperature reaction is finished, naturally cooling to room temperature, centrifugally separating a solid product, washing with deionized water and ethanol, and carrying out vacuum drying to obtain the nickel sulfide electrocatalyst; the method is simple and easy to operate, and an effective scheme is provided for solving the problem of high cost of a traditional noble metal catalyst in the field of water electrolysis hydrogen production.

The invention discloses a Ni3S2 / Ni (OH) 2 / metal phthalocyanine heterojunction self-supporting electrocatalyst as well as a preparation method and application thereof. According to the catalyst, foamed nickel serves as a substrate and a nickel source, a Ni3S2 / Ni (OH) 2 nanosheet array precursor grows in situ through one-step hydrothermal, metal phthalocyanine is loaded through solvothermal, and the Ni3S2 / Ni (OH) 2 / metal phthalocyanine composite electrode material with a multistage heterogeneous interface is formed. The material can be used for preparing 2, 5-furandicarboxylic acid (FDCA) through efficient electro-catalysis of deep oxidation of 5-hydroxymethylfurfural (HMF) in an alkaline solution at room temperature; the metal phthalocyanine molecular catalyst and the nickel-based composite material are combined for preparing the self-supporting electrode for the first time, efficient and high-selectivity total oxidation of HMF is achieved in an alkaline environment, the structure avoids using a binder, the conductivity, the structural stability and the active site exposure degree are enhanced, and industrial large-scale preparation is facilitated.

The invention belongs to the technical field of functional materials, and particularly relates to a three-dimensional heterogeneous difunctional electrode material and a preparation method and application thereof. The preparation method of the three-dimensional heterogeneous difunctional electrode material comprises the following steps: S1, pretreating the foamed nickel substrate; s2, respectively dissolving cobalt nitrate hexahydrate, urea and ammonium fluoride into water to obtain a mixed solution A; s3, carrying out hydrothermal treatment on the pretreated foamed nickel and the mixed solution A; s4, surface cleaning is conducted on the foamed nickel obtained through the hydrothermal treatment with deionized water and ethyl alcohol; and S5, performing vulcanization treatment on the electrode material obtained in the step S4. In the alkaline seawater electrolysis and hydrazine oxidation reaction coupling process, the synthesized electrode material shows the hydrazine oxidation potential far lower than that of commercial precious metal in the hydrazine oxidation reaction, the energy consumption of seawater electrolysis hydrogen production in a mixed system is greatly reduced, and wide application prospects are achieved.

The present disclosure provides a cluster material and a preparation method thereof, the method comprising: converting a metal material or alloy material into metal ions; preparing a liquid medium, the liquid medium comprising a surfactant and a solvent; dispersing the metal ions in the liquid medium and applying an alternating pulse field to control the reaction and dispersion of the material to obtain a colloidal solution or suspension of the cluster material, and centrifuging the colloidal solution or suspension to obtain a cluster material powder. This scheme combines physical and chemical methods in a multi-step organic composite, and by utilizing an alternating field to regulate the growth process of cluster nucleation, it not only avoids the disadvantages of larger size and poor uniformity of clusters synthesized by physical methods, but also allows for targeted selection and change of reaction raw materials in the liquid medium according to the target product, thereby greatly improving the efficiency of chemical cluster synthesis and being more environmentally friendly.

The invention discloses a NiCo-LDH / Ni6S7 composite bifunctional catalytic electrode material with a self-supporting nano array structure and a preparation method thereof.The preparation method comprises the steps that urea is added into a first solvent, and heating and stirring are conducted till the urea is completely dissolved to obtain a solution A; sequentially adding nickel salt and cobalt salt into the solution A, and stirring until the nickel salt and the cobalt salt are completely dissolved to obtain a solution B; adding ammonium salt into the solution B, and stirring until the ammonium salt is completely dissolved to obtain a solution C; putting the cleaned and dried foamed nickel into the solution C for hydrothermal reaction, and washing and drying to obtain a NiCo-LDH material with a self-supporting nano array structure; and adding a vulcanizing agent into a second solvent, heating and stirring until the vulcanizing agent is completely dissolved to obtain a solution D, putting the NiCo-LDH material with the self-supporting nano array structure into the solution D for hydrothermal reaction, and washing and drying to obtain the NiCo-LDH / / Ni6S7 composite material with the self-supporting nano array structure. The problems that an existing LDH material is prone to agglomeration and curling and poor in conductivity, and catalytic performance is reduced due to the fact that a polymer adhesive is used are solved.