62results about "Nickel sulfides" patented technology

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 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 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 application relates to a preparation method of an electrochemiluminescence sensor and application thereof, and belongs to the technical field of electrochemiluminescence sensors, and specifically comprises the following steps: step 1, firstly, a bare glassy carbon electrode is repeatedly polished with aluminum oxide powder, and then the electrode is thoroughly cleaned before use; Au@CN solution is coated on the electrode; step 2, after the electrode is dried, a conconavalin A solution is added dropwise, and after 1 hour, the electrode is washed with a phosphate solution to block the non-specific binding between the conconavalin A and the electrode surface; step 3, NMS / CNT@Glu solution is coated on the electrode surface, and after 1 hour, the obtained electrode is washed to remove the unbound NMS / CNT@Glu on the outer surface, so that an electrochemiluminescence sensor for detecting conconavalin A is obtained. When the sensor detects conconavalin A, a wide linear range and a low detection limit are exhibited, so that the sensor can be applied to actual detection.

This invention discloses a Co 0.2 Cd 0.8 This paper describes the preparation method of S / CaTiO3 / NiSx materials and their application in photocatalytic nitrogen fixation, belonging to the field of photocatalytic materials technology. Firstly, an S-type heterostructure Co was prepared using an ultrasonic method. 0.2 Cd 0.8 S / CaTiO3 composite, then using ultrasound to bond metalloid NiS x Nanoparticle co-catalysts and Co 0.2 Cd 0.8 S / CaTiO3 complex forms Co 0.2 Cd 0.8 S / CaTiO3 / NiS x Ternary composite photocatalyst. The semiconductor Co in this invention... 0.2 Cd 0.8 S and semiconductor CaTiO3 first form an S-type heterostructure, which not only accelerates the directional movement and separation of photogenerated electrons and holes, but also maintains the strong redox capability of photogenerated charge carriers; in addition, NiS is loaded onto the S-type heterostructure. x co-catalyst, NiS x Nanoparticle co-catalysts, acting as electron-capturing centers, can not only provide more reactive sites but also further improve charge separation efficiency.

The application provides a positive electrode material and a preparation method thereof, a positive electrode sheet and a lithium ion battery, and comprises a positive electrode active material and a coating layer coated on the surface of the positive electrode active material, wherein the coating layer comprises a lithium-rich reverse perovskite lithium supplement and a conductive agent, the mass content of the lithium-rich reverse perovskite lithium supplement is 0.01-10% of the mass of the positive electrode active material, and the mass content of the conductive agent is 0.01-3% of the mass of the positive electrode active material. Compared with the prior art, the positive electrode material provided by the application uses a lithium-rich reverse perovskite compound as a lithium supplement, is simultaneously compounded with the positive electrode active material to form a coating type structure, can additionally provide a large amount of lithium ions, makes up for the irreversible lithium loss of the negative electrode, and improves the reversible capacity of the full battery system.

The invention provides a method of cascade flash (FWF) Joule heating and a system thereof. The FWF Joule heating process subjects an external feedstock in an external vessel to a flash Joule heating process, wherein the flash Joule heating process of the external feedstock causes conversion of an internal feedstock within an internal vessel (the internal vessel is within the external vessel) to a converted material.

The invention provides a preparation method of a heterogeneous transition metal chalcogenide material. The preparation method comprises a heating step, a plasma forming step and a deposition step. In the heating step, the chalcogenide solid is heated at a heating temperature to form a chalcogenide gas. In the plasma forming step, reaction gas is introduced to assist the chalcogenide gas in forming chalcogenide plasma. In the deposition step, a substrate is arranged adjacent to the chalcogenide plasma, the substrate comprises a base material and a plating layer, and the chalcogenide plasma and the plating layer are subjected to a deposition reaction at a reaction temperature and a reaction pressure to form the heterogeneous transition metal chalcogenide material with excellent optical characteristics and a surface-enhanced Raman scattering effect. Therefore, the heterogeneous transition metal chalcogenide material can be applied to a surface-enhanced Raman scattering sensor.

The application belongs to the field of electrochemical catalysts, and particularly relates to a semiconductor phase MoS2 transition metal-based composite catalyst, a preparation method thereof and application of the semiconductor phase MoS2 transition metal-based composite catalyst in electrocatalytic synthesis of ammonia from N2O. The preparation method of the semiconductor phase MoS2 transition metal-based composite catalyst comprises the following steps: (1) dissolving molybdate and a sulfur-containing organic compound in water, then adding a soluble salt of a transition metal to form a uniform precursor solution by stirring; adding a phosphorization source into the precursor solution to uniformly disperse to obtain a mixed solution; (2) reacting the mixed solution in step (1) at 160-200 DEG C for 20-28 h, cooling to room temperature after the reaction is completed, and washing and drying the obtained product to obtain the semiconductor phase MoS2 transition metal-based composite catalyst. The application successfully constructs a close heterojunction of transition metal phosphide / sulfide and MoS2 in a MoS2-based composite structure through a one-pot hydrothermal-phosphorization synergistic preparation method.

The application provides a preparation method of a molybdenum oxide-nickel sulfide heterostructure nanometer array electrocatalyst, and comprises the following steps: 1) preparing a nickel foam (NF) substrate; 2) preparing a homogeneous solution of thiourea and (NH4)6Mo7O 24 ·4H2O in a molar ratio of 10-20:1; 3) dissolving the thiourea and (NH4)6Mo7O 24 ·4H2O in deionized water to obtain a homogeneous solution after stirring; and 4) reacting the nickel foam substrate prepared in the step 1 with the homogeneous solution prepared in the step 2 to obtain a MoO x -Ni3S2 / NF heterostructure nanometer array sample. The technical scheme of the application can greatly improve the conductivity and catalytic efficiency of the catalyst and reduce the manufacturing cost.

The present invention provides a method for producing metal sulfides containing nickel and / or cobalt, the method comprising the steps of: i. forming an aqueous metal sulfate solution by reacting sulfuric acid with a raw material feed containing nickel and / or cobalt in water; ii. crystallizing the metal sulfate from the aqueous metal sulfate solution to form crystalline metal sulfate in a mother liquor containing uncrystallized metal sulfate; iii. separating the crystalline metal sulfate from the mother liquor; iv. reacting at least a portion of the uncrystallized metal sulfate with hydrogen sulfide in an acidic aqueous medium to obtain a slurry consisting of a solid phase containing a metal sulfide precipitate and an aqueous phase containing one or more impurities and sulfuric acid; and v. separating the solid phase and the aqueous phase.

The invention discloses a Ni-MoS2-NiS2 catalyst as well as a preparation method and application thereof, and belongs to the technical field of hydrogen production by electrolysis of water. The preparation method of the Ni-MoS2-coated NiS2 catalyst comprises the following steps: by taking a molybdenum source and a nickel source as raw materials, preparing a molybdenum-nickel alkoxide precursor by adopting a solvothermal method; and calcining the molybdenum nickel alkoxide precursor and sublimed sulfur powder in an inert atmosphere to prepare the Ni-MoS < 2 >-coated NiS < 2 > catalyst. The Ni-MoS2-coated NiS2 electrolyzed water HER catalyst synthesized by the invention is prepared by a simple one-step method, has excellent electrolyzed water HER activity and stability, has potential application prospects in the field of hydrogen production by electrolyzed water industrialization, and provides theoretical guidance and technical support for design synthesis and practical application of other non-noble metal-based electrolyzed water catalysts.

This invention specifically relates to an island-shaped MS2@TiO2 heterojunction, its preparation method, and its applications. First, an island-shaped MS2@TiO2 (M=Fe, Co, Ni, Cu) heterojunction composed of MS2 nanoparticles and TiO2 nanoribbons is prepared through a simple hydrothermal, ion exchange, and sulfidation reaction to capture and catalyze polysulfides. The MS2 nanoparticles are uniformly anchored on the surface of the TiO2 nanoribbons. In the MS2@TiO2 heterojunction, TiO2 acts as an adsorption site, effectively inhibiting lithium polysulfide shuttle, while MS2 acts as an electrocatalytic site, improving the conversion kinetics of polysulfides. Li-S batteries using MS2@TiO2 heterojunction-modified membranes exhibit excellent electrochemical performance, including a 2318 mAh g⁻¹ at 0.1 C. ‑1 It exhibits high initial discharge capacity, a capacity decay rate of 0.046% at 1 C, and excellent long-term cycling stability.

The present application relates to the technical field of gasification metallurgy, and particularly relates to a production and preparation method of high-dissolution-performance sulfur-carbonyl nickel pellets, to solve the problem that the content of impurities in sulfur-containing nickel metal is high, the uniformity of S element distribution in the sulfur-containing nickel metal is poor, and the dissolution stability, plating solution stability and plating layer quality are greatly affected when traditional electrolytic method or smelting method is used to smelt nickel. The method can effectively remove the difficult-to-remove impurities in the group VIII metal and CO gas through selective reaction, and has lower metal impurities than traditional electrolytic method and smelting method. The high-dissolution-performance sulfur-carbonyl nickel pellets are prepared through chemical atomic vapor deposition reaction, and the S element in the sulfur-containing nickel metal is more uniformly distributed, so that the dissolution stability, plating solution stability and plating layer quality are better, thereby effectively reducing the local passivation of anode dissolution, plating solution composition fluctuation and plating layer performance difference caused by uneven S distribution.

This invention relates to the field of batteries and discloses a method for preparing nickel disulfide / copper sulfide / carbon composite hollow spheres and their applications. The invention uses hollow spherical Ni-MOF as a precursor, combined with subsequent ion exchange, PDA coating, glucose coating, carbonization, and sulfidation to prepare nickel disulfide / copper sulfide / carbon composite hollow spheres. This material inherits the porous hollow structure of Ni-MOF, providing a high-speed and efficient transport channel for ion diffusion in electrode materials, while mitigating volume change effects and improving the cycle life of sodium-ion batteries. Furthermore, the controllable introduction of appropriate amounts of copper ions through ion exchange to form a nickel-copper bimetallic sulfide heterostructure can accelerate ion diffusion kinetics, reduce the ion diffusion barrier, and enhance structural stability. Finally, the nitrogen-doped carbon derived from polydopamine carbonization in the middle layer improves the conductivity of the composite material and increases sodium storage active sites, while the outermost carbon layer derived from glucose carbonization further enhances the structural stability of the composite material.

The application discloses a kind of carbon-coated metal sulfide of core-shell structure and its preparation method and application, it is related to new energy material technical field.In the present application, the composite material is core-shell structure, and the inner core and shell are both carbon-coated NiS / NiS2 Nanoparticle structure;The preparation method of the composite material is: nickel salt and H4ABTC are dissolved in aqueous solution consisting of N, N-dimethylacetamide and concentrated hydrochloric acid, heat preservation filtration obtains Ni-soc-MOF;Thioacetamide and Ni-soc-MOF are dispersed into ethanol and high-temperature reaction;The obtained solid product is placed in 500 DEG C argon environment and carries out high-temperature pyrolysis reaction, and the core-shell structure carbon-coated metal sulfide composite material NiS / NiS2@C is prepared.The core-shell structure NiS / NiS2@C composite material in the present application, the carbon skeleton structure outside it can significantly the mechanical strength of the composite material, its internal porosity can effectively reduce the volume expansion of the composite material during cyclic use, and the ordered framework constructed by microstructure can effectively prevent the aggregation of nanoparticle.

The invention provides a nickel disulfide / cobalt disulfide / tin disulfide nanocube material, a preparation method and application thereof, and a rechargeable battery. The preparation method comprises the following steps: preparing a nanocube precursor through a room temperature aging method, vulcanizing and converting the nanocube precursor into a three-dimensional cubic material NiS2 / CoS2, and growing a SnS2 sheet layer on the cubic surface through a hydrothermal method to obtain a NiS2 / CoS2 / SnS2 composite material. Compared with the prior art, the cycle stability, the service life and the battery capacity are greatly improved by the product composition and the multi-crystal face structure, the three-dimensional structure design can bear large-current long circulation, the loss of active substances in the charging and discharging process is reduced, the volume change in the charging and discharging process is buffered, and the service life of the battery is prolonged. And the falling of the active material in the cycle process is reduced, sodium modification / sodium removal in the reaction process is facilitated, and the material has the advantages of good cycle performance, high energy density and the like when being applied to the sodium ion battery negative electrode material.

This invention provides a cuprous sulfide / nickel disulfide / carbon composite material, its preparation method, and its application in batteries. The preparation method involves dispersing a copper source, a nickel source, polyvinylpyrrolidone, and a sulfur source in a solvent, followed by a hydrothermal reaction to obtain Cu. 1.81 The Cu2S / NiS2 flower-like material is obtained by further annealing. Compared with existing technologies, this invention prepares Cu2S / NiS2 / C nanosphere composite materials through a simple hydrothermal reaction and annealing process. The heterogeneous interface between Cu2S and NiS2 crystals can induce an internal electric field to accelerate ion diffusion kinetics, improve conductivity, and provide abundant reaction sites for sodium energy storage. It exhibits high reversible capacity, high specific capacity, stable cycling performance, and robust rate performance.

To provide a negative electrode active material, a negative electrode material, an alkali ion battery having the negative electrode material, and a manufacturing method of the negative electrode active material, capable of realizing an excellent capacity characteristic and a cycle characteristic in the alkali ion battery.SOLUTION: A negative electrode active material for an alkali ion battery of the present invention, contains a composite material containing metal sulfide and carbon. The metal sulfide includes zinc, and at least one kind of transition metal element other than zinc. A manufacturing method of the negative electrode active material for the alkali ion battery of the present invention, comprises: a step 1 of obtaining a precursor by mixing a zinc source, a transition metal element source, and an organic ligand into a solvent; a step 2 of obtaining the sulfide by performing a heating treatment on the precursor in the presence of a sulfur source; and a step 3 of obtaining the composite material by performing an etching treatment on the sulfide.SELECTED DRAWING: None

The application relates to a preparation method of a novel NiV2S4 and magnesium hydride composite hydrogen storage material and application thereof, the material takes magnesium hydride and NiV2S4 as main components, and belongs to the technical field of magnesium-based hydrogen storage materials. The hydrogen storage material is prepared by mixing magnesium hydride and NiV2S4 through a ball milling process. The preparation method comprises the following steps: firstly, uniformly dispersing nickel chloride hexahydrate, sodium orthovanadate and thiourea into water; then, transferring into a Teflon container and keeping at 150 DEG C-180 DEG C for 12-24 h, washing and drying to obtain NiV2S4. Finally, ball milling the NiV2S4 and magnesium hydride to obtain the magnesium hydride composite hydrogen storage material based on NiV2S4. The composite hydrogen storage material has excellent performance, compared with the ball-milled magnesium hydride, the initial hydrogen release temperature is reduced by 138 DEG C, the hydrogen release amount reaches 6.21 wt% at 350 DEG C in 5 min, the hydrogen absorption amount reaches 4.8 wt% at 150 DEG C in 20 min, and the capacity is greater than 90% after 60 cycles at 300 DEG C.

This invention provides a hollow polyhedron NiS2 / Cu 7.2 This invention relates to the field of sodium-ion battery electrode materials technology, specifically the S4 sodium battery composite material, its preparation method, and its application. The hollow polyhedral NiS2 / Cu composite material of this invention... 7.2 The S4 sodium battery composite material exhibits a hollow polyhedral morphology and is prepared from nickel nitrate, copper chloride, and sulfur powder through a simple hydrothermal reaction and high-temperature calcination. The hollow polyhedral NiS2 / Cu... 7.2 The S4 sodium battery composite material is used in the negative electrode material of sodium batteries. The assembled half-cell has good rate performance and excellent cycle performance. After 100 cycles at a current density of 0.1 A / g, it has a discharge specific capacity of 566.3 mAh / g, and after 10,000 cycles at a high current density of 10 A / g, it still has a discharge specific capacity of 443.7 mAh / g.

The application discloses a high-performance oxygen evolution reaction composite electrocatalyst and a preparation method thereof, and belongs to the field of electrocatalytic material preparation. The application solves the problem that it is difficult to realize uniform loading and precise size control of RuO2 nanoparticles on a three-dimensional porous complex substrate (foamed nickel), thereby affecting the performance and repeatability of the prepared electrocatalyst. The method comprises the following steps: sulfidizing the foamed nickel with thiourea first, and then uniformly depositing RuO2 nanoparticles on the surface of the foamed nickel-based Ni3S2 by using an ALD technology. The application precisely controls the size of the RuO2 nanoparticles on the surface of the foamed nickel-based Ni3S2 to be 1.5-3.5 nm, and the surface density to be 0.8-1.2´10 12 / cm 2 , so that 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.