25 results about "Nickel selenide" patented technology

This invention provides a zinc-doped nickel selenide / graphite-phase carbon nitride composite photocatalyst and its preparation method. The method involves adding zinc acetate, nickel chloride hexahydrate, melamine, urea, pyrrole, and polyaniline to deionized water in a mass ratio of (0.5-1.5):(4-6):(4-10):(6-8):(0.125-0.2):(0.25-1) to obtain a mixed solution. The pH of the mixed solution is adjusted to 9-10, and the solution is then mixed thoroughly to obtain a precursor solution. The precipitate obtained after centrifuging the precursor solution is dried to obtain a precursor. The precursor and selenium source are then subjected to a two-stage calcination treatment under an inert atmosphere in a mass ratio of (1-10):(0.2-5). The first stage temperature is 450-600℃, and the second stage temperature is 300-400℃, to obtain the zinc-doped nickel selenide / graphite-phase carbon nitride composite photocatalyst. This invention can effectively increase the number of reactive sites in photocatalysts and expand the migration path of photogenerated carriers, thereby effectively reducing the recombination of photogenerated carriers in photocatalytic materials and fundamentally improving their photocatalytic hydrogen evolution efficiency.

The invention discloses preparation and application of a nickel selenide / ferronickel phosphate crystal / amorphous heterogeneous catalyst, and relates to the technical field of electrochemistry. Selenizing the foamed nickel at low temperature in an inert atmosphere to generate a crystalline NiSex layer in situ; and by taking the obtained electrode as a working electrode, carrying out electrodeposition in a deposition solution containing nickel salt, ferric salt, hypophosphite and acetate by adopting a cyclic voltammetry method, so that amorphous NiFePOy is deposited on the surface of NiSex, and a NiSex / NiFePOy crystal / amorphous heterostructure nanosheet layer is constructed and is used for an alkaline medium urea oxidation reaction. The invention has the following beneficial effects: crystalline / amorphous interface coupling and a nanosheet self-supporting structure synergistically improve active sites and charge transfer capability, reduce energy consumption and improve current output; meanwhile, the electrode stability and durability are enhanced; the method has the advantages of low material cost, mild and simple process, suitableness for amplified preparation, and application potential of urea-assisted water electrolysis energy-saving hydrogen production.

The invention belongs to the technical field of photocatalysts, and particularly relates to a sulfur nickel selenide cocatalyst, a photocatalyst and a preparation method and application of the sulfur nickel selenide cocatalyst, and the preparation method of the sulfur nickel selenide cocatalyst comprises the steps that a soluble nickel source, a soluble sulfur source and a soluble selenium source are dispersed in an alcohol solvent to be mixed, a reaction is conducted for 10-20 h at the temperature of 160-200 DEG C, and the sulfur nickel selenide is obtained after washing and drying; the molar ratio of the soluble nickel source to the soluble sulfur source to the soluble selenium source is 1: (0.5-1.5): (0.5-1.5). In the cocatalyst, Se is introduced into a NiS2 structure, lattice spacing is increased, a replacement solid solution NiSexS2-x is formed, in the solid solution, Se atoms replace S atoms in an atomic level and enter NiS2 lattices instead of being simply attached to the surface of NiS2 or forming heterojunctions, a single-phase and uniform crystal structure is formed instead of physically mixed two phases, and the structure is stable.

The present invention discloses a material, preparation method, and application for the synergistic production of water and electricity through interfacial evaporation. The material uses laser-processed nickel foam as a substrate and selenium powder as the main raw material. Ethylene glycol and ethylenediamine are used as the main solvents, and the solvent concentration and amount of selenium powder added are controlled. The nickel foam / nickel selenide is synthesized by a solvothermal method. Hexadecyltrimethoxysilane is then sprayed on the upper layer. After vacuum drying, a material with a Janus structure having different wettabilities on the upper and lower surfaces is obtained. This material, combined with a thermoelectric power generation module, can simultaneously generate electricity while producing water. The Janus nickel foam / nickel selenide can not only desalinate seawater through interfacial evaporation, but also, in a wet state, by combining the sample with a TE module, where the sample receives sunlight heat and transfers it to the upper surface of the TE module, creating a temperature difference between the upper and lower surfaces of the module for thermoelectric power generation.

The application discloses a lamellar nickel selenide / vanadium selenide self-supporting composite electrode of mallotus philippinensis and a preparation method and application thereof. In the preparation method, selenium powder is used as a selenium source, sodium dodecyl sulfate and polyvinylpyrrolidone are used as morphology control agents, a vanadium source and an alkali source are uniformly mixed, a nickel-vanadium-based hydroxide precursor is in-situ synthesized on a foam nickel by using a hydrothermal reaction method, selenium powder is added into the precursor, and an integrated Ni3Se2 / V5Se8 / NF self-supporting composite electrode is prepared by using a pyrolysis method. The application accelerates the redox process in the electrochemical reaction process, reduces the adsorption energy barrier of the reaction intermediate, and thus improves the catalytic performance of the material. On the other hand, the electron transfer in the electrocatalytic reaction process is improved, the catalytic activity is promoted, the strong interaction between the active material and the NF substrate can be effectively ensured, and the active material exhibits good mechanical stability and anti-deformation ability in the electrochemical application.

The present invention relates to a non-stoichiometric Ni0 .85Se / NaCI composite nanomaterial obtained from a nickel selenide and sodium chloride, useful as a multifunctional electrocatalyst and / or photocatalyst for the evolution of hydrogen and oxygen from water, and / or for urea oxidation, and which can also act as a mediator in the oxygen evolution reaction, and the simultaneous purification of aqueous solutions contaminated by organic pollutants. The invention also relates to the method for obtaining said composite nanomaterial, together with the use thereof for obtaining a multifunctional electrode for the evolution of hydrogen and oxygen from water, and / or for urea oxidation. The invention also relates to a multifunctional electrode comprising the non- stoichiometric Ni0 . 85Se / NaCI composite nanomaterial of the invention.

The application discloses a preparation method of a self-supporting catalyst of a nickel diselenide hierarchical nanoneedle array, and belongs to the field of new chemical material catalysis. The method comprises the following steps: dissolving nickel salt, cerium salt, urea and ammonium fluoride in deionized water, stirring and uniformly mixing, placing the mixture and carbon fiber paper in a reaction kettle to perform a hydrothermal reaction, naturally cooling to room temperature after the reaction is completed, taking out the carbon fiber paper, washing and drying, thereby preparing the carbon fiber paper loaded with a nickel precursor array, placing the carbon fiber paper loaded with the nickel precursor array in air to perform calcination, washing and drying the calcination product, adding deionized water and NaHSe solution, uniformly mixing, performing a hydrothermal reaction, naturally cooling to room temperature after the reaction is completed, taking out the carbon fiber paper, washing and drying, thereby obtaining the self-supporting catalyst of the nickel diselenide hierarchical nanoneedle array rich in nickel vacancies. The catalyst prepared by the method is applied to electrocatalytic hydrogen evolution, and the experimental results show that the catalyst has excellent hydrogen evolution performance and has a good application prospect in the field of electrocatalytic hydrogen evolution.

The present invention relates to a graphene / tungsten disulfide / tantalum nickel selenide crystal-based heterojunction vertical device, preparation method, and application, belonging to the field of light detection. The heterojunction vertical device comprises, from bottom to top, a Si / SiO2 substrate, graphene, WS2, and Ta2NiSe5, with two electrodes on the graphene and Ta2NiSe5, respectively. The preparation method comprises: mechanically exfoliating the graphene, WS2, and Ta2NiSe5; sequentially transferring the three materials onto Si / SiO2 using a PVA dry transfer method; photolithography to define the electrode positions; and thermally evaporating the electrodes. The prepared thin-film device exhibits excellent self-driven light detection performance and has advantages such as stable performance. As a photodetector, it can detect light from visible light to the mid-infrared band. The thick Ta2NiSe5 structure enhances the detector's absorption of mid-infrared light, giving the detector the advantages of high sensitivity, simple device structure, and strong practicality.

The application discloses a kind of ligand control oxygen evolution catalyst surface reconfiguration method and catalyst and application.The method involves ligand tuning surface reconstruction, can simultaneously incorporate doped cation and oxygen vacancy, to improve the catalytic activity of OER.By using nickel telluride, nickel oxide, nickel sulfide or nickel selenide as a pre-catalyst, based on the ligand-induced delayed doping effect using ammonia complex in alkaline electrolyte, a surface engineering heterojunction structure consisting of nickel-based pre-catalyst and (oxy) hydroxide is developed.The method of the application is simple in process, easy to operate, and can be popularized in industry;And the oxygen evolution catalyst prepared has the characteristics of rich active site and oxygen vacancy, large chemical active surface area, good stability, controllable, low cost.

The application discloses a hemoglobin-like iron-nickel selenide / three-dimensional porous graphene aerogel lithium ion battery negative electrode composite material and a preparation method thereof, and belongs to the technical field of battery negative electrode composite materials. The negative electrode material is composed of a three-dimensional porous graphene aerogel framework and hemoglobin-like iron-nickel selenide microparticles anchored on the framework. The negative electrode material is synthesized by a one-step hydrothermal method to obtain iron-nickel selenide with special micro-morphology, and then is combined with graphene aerogel through hydrothermal treatment and freeze drying. The electrode material has the advantages of highly simplified preparation process, high yield and unique morphology. The synergistic effect between the three-dimensional interconnected conductive network of the graphene aerogel and the hemoglobin-like nanostructure effectively alleviates the volume expansion problem in the charging and discharging process and shortens the ion diffusion path, so that the prepared composite electrode material exhibits good rate performance and long cycle stability, and is beneficial to promoting the development of the next generation of high-energy-density lithium ion batteries.

The application discloses a strontium-doped low-crystalline nickel-iron hydroxyl oxide water electrolysis nanocatalyst and a preparation method and application thereof, and belongs to the technical field of electrocatalyst preparation. The catalyst has an ultrathin nanosheet structure and is low-crystalline, and is prepared by in-situ electrooxidation reconstruction of a strontium-doped nickel-iron selenide pre-catalyst. The application weakens the metal-selenium bond strength by strontium (Sr) doping, induces phase change to generate low-crystalline Sr-doped nickel-iron hydroxyl oxide (NiFeOOH) rich in bimetallic active sites, enhances the covalence of metal-oxygen bonds, introduces bimetallic vacancies at the same time, optimizes the adsorption energy of oxygen-containing intermediates, and significantly improves the electrocatalytic activity and stability of an anode oxygen evolution reaction, and has an excellent industrialization application prospect in an anion exchange membrane water electrolysis hydrogen production system.

The invention discloses a carbon-coated nickel-cobalt-manganese selenide composite material, a preparation method thereof and application of the carbon-coated nickel-cobalt-manganese selenide composite material as a supercapacitor electrode material, and belongs to the technical field of supercapacitors. The method comprises the following steps: dissolving a nickel source, a cobalt source, a manganese source, a coordination agent and a surfactant in an organic-inorganic mixed solvent, and carrying out solvothermal reaction to obtain a nickel-cobalt-manganese material; adding a selenium source, hydrazine hydrate and the nickel-cobalt-manganese material into water, dispersing, and carrying out hydrothermal reaction to obtain a nickel-cobalt-manganese selenide material; the preparation method comprises the following steps: grinding and mixing a carbon source and a nickel cobalt manganese selenide material, and calcining in a protective atmosphere to obtain the carbon-coated nickel cobalt manganese selenide composite material, the composite material has excellent performances such as electrical conductivity, specific capacity and cycling stability, and can be used for a supercapacitor, and the obtained supercapacitor shows relatively high specific capacitance and coulombic efficiency.

The invention discloses manganese-doped nickel selenide nanoparticles, a preparation method thereof and application of the manganese-doped nickel selenide nanoparticles in methanol electrocatalytic oxidation. Firstly, a series of Ni3Se4-x% Mn (x = 5, 10 or 15) flaky nanoparticles are prepared through a hydrothermal method, the particle size is 18-39 nm, and the material has excellent performance in methanol oxidation reaction and is superior to pure-phase Ni3Se4. When the doping amount of Mn is 10%, the methanol oxidation performance is the best, in a 1M KOH + 1M methanol electrolyte, the current density reaches about 190 mA cm <-2 > when the voltage is 1.6 V, the Faraday efficiency is close to 100%, the current density is still kept at 123 mA cm <-2 > after being tested for 18 hours, and the stability is good. In general, by introducing manganese atoms to regulate and control the spinning state and the electronic structure, the catalytic performance is improved, the preparation method is simple, the cost is low, and certain application prospects are achieved in the fields of hydrogen production through water electrolysis coupling, small organic molecule electrocatalytic oxidation and the like.

The invention provides a wet chemical synthesis method of nickel diselenide nanoparticles for a supercapacitor, which mainly comprises the following steps: (1) slurry preparation: in a glove box filled with argon, dissolving 0.4 mM of Ni (acac) 2 and 8mM of Se powder in a bottle containing 30mL of OAm and 3mL of DDT, stirring at 50 DEG C for 1 hour, and then filtering through a 0.2 mu m filter to obtain precursor slurry; (2) heating reaction: placing 10mL of the precursor solution and 60mL of OAm in a 150mL three-necked flask, carrying out vacuum treatment at 60 DEG C for 30 minutes, then heating to 220 DEG C at a rate of 5 DEG C / min in an Ar atmosphere, reacting for 20 minutes, and then rapidly cooling the solution to room temperature; and (3) washing and drying: mixing the solution with 60mL of chloroform, centrifuging at 8000rpm for 5 minutes, repeating the centrifugal washing process for 3 times, and drying in vacuum at 60 DEG C for 12 hours. The nickel diselenide nanoparticles prepared by the method are uniform in morphology, have excellent supercapacitor properties, and solve the technical problems of low specific capacitance and poor long-term stability when transition metal is used as a supercapacitor.

The application discloses a porous nickel selenide-carbon nanotube microsphere / polyimide composite wave-absorbing material and a preparation method thereof. The porous nickel selenide-carbon nanotube microsphere / polyimide composite wave-absorbing material is prepared by taking polyimide as a matrix and nickel selenide-carbon nanotube microspheres as multi-component fillers, and has the properties of electrical conductivity, heat insulation, compression resistance and electromagnetic wave absorption.

The application relates to the technical field of supercapacitor electrode materials, in particular to a sulfur-doped nickel cobalt selenide composite material and a preparation method and application thereof. The preparation method comprises the following steps: taking SeO2 as a selenium source, taking hydrazine hydrate as a strong reducing agent, mixing a SeO2 ethylene glycol solution with the hydrazine hydrate and a NiCo-PBA@NiCo-LDH multi-level core-shell precursor, and performing a selenization reaction to obtain NiCoSe2; mixing the NiCoSe2 with sulfur powder, and performing calcination treatment to obtain the sulfur-doped nickel cobalt selenide composite material. Through the synergistic effect of the multi-level core-shell structure and the hetero-doping, the sulfur-doped nickel cobalt selenide composite material is endowed with excellent electrochemical energy storage performance, and the problems of poor rate performance and decreased cycle stability caused by the insufficient intrinsic electrochemical activity and large volume change in the charging and discharging process of the transition metal selenide as a supercapacitor electrode material are effectively solved.

The present invention provides a nickel diselenide and nickel tetraphosphide heterostructure material and its preparation method and application, belonging to the field of electrocatalyst technology. The present invention mixes a nickel source, urea, ammonium fluoride, water and a conductive matrix, and then performs a hydrothermal reaction to obtain a precursor material; the precursor material is sequentially selenized and phosphated to obtain NiSe2 and Ni5P4 heterostructure materials. The present invention uses urea as a precipitant, ammonium fluoride as an etchant, a nickel source and a conductive matrix to perform a hydrothermal reaction to obtain an interwoven sheet-like precursor material, and then performs selenization and phosphating treatments, controls the order of selenization and phosphating treatments, and obtains a heterostructure material with an open morphology structure. The material has two components and multiple catalytic active centers, and the electronic interaction of the heterogeneous interface can regulate the adsorption / desorption energy of the active sites to the reaction intermediates in the process of electrocatalytic water hydrogen production, thereby improving its catalytic activity.

The invention relates to the field of photovoltaic technology, and discloses a perovskite solar cell, a preparation method thereof and a laminated solar cell. The perovskite solar cell comprises a substrate, a tin oxide electron transport layer, a perovskite light absorption layer, a hole transport layer and a metal electrode which are arranged in sequence, a nickel selenide doped conductive oxide film is arranged between the tin oxide electron transport layer and the perovskite light absorption layer, and the doping concentration of nickel selenide in the conductive oxide film is controlled to be 0.01-5 mmol / L. According to the invention, the conductive oxide film is added between the tin oxide electron transport layer and the perovskite light absorption layer, and the nickel selenide is doped in the film layer; therefore, the nickel selenide-doped conductive oxide film can regulate and control the energy level difference between the tin oxide electron transport layer and the perovskite light absorption layer, passivate perovskite interface defects, and fill and passivate oxygen vacancies and other defects of the tin oxide electron transport layer, so that recombination can be greatly reduced, the carrier collection efficiency can be improved, and the cell performance can be further improved.

The invention discloses a preparation method of a nickel-tungsten bimetallic catalyst based on selenylation, the catalyst and application, in the method, a tungsten-doped nickel-based metal organic framework material is provided as a precursor, and a nickel element and a tungsten element grow on a conductive substrate; the precursor, a selenium source and a reducing agent are subjected to a selenylation reaction under the hydrothermal condition, the nickel-tungsten bimetallic catalyst is obtained, and the nickel-tungsten bimetallic catalyst comprises a heterojunction formed by nickel selenide and tungsten selenide. The nickel-tungsten bimetallic catalyst shows excellent oxygen evolution reaction and hydrogen evolution reaction activity and stability.

This invention discloses a manganese-doped nickel diselenide cathode material, its preparation method, and its applications, belonging to the field of zinc-iodine battery technology. The invention utilizes a hydrothermal synthesis method, employing nickel nitrate and manganese nitrate as metal precursors, selenium powder as a selenium source, and hydrazine hydrate as a reducing agent. The process involves mixing and ultrasonication, hydrothermal reaction, centrifugation, washing, and vacuum drying. Manganese doping induces localized lattice distortion in nickel diselenide, driving the transition of the nickel center's electronic configuration from a low-spin to a high-spin state. Simultaneously, it optimizes the material's electronic structure and surface adsorption properties, significantly accelerating iodine redox kinetics and suppressing the polyiodide shuttle effect. The manganese-doped nickel diselenide cathode material provided by this invention has a simple preparation process and excellent performance, providing key material and technical support for the development of high-rate, long-life aqueous zinc-iodine batteries, and is suitable for large-scale energy storage applications.

This invention relates to the field of energy storage nanomaterials technology, specifically to a method for preparing a hierarchical hollow microspherical nickel selenide / nitrogen-doped porous carbon composite material, along with its materials and applications. The method includes: preparing a basic nickel carbonate precursor solution using nickel nitrate hexahydrate, urea, and deionized water in a specified ratio, and conducting a hydrothermal reaction; washing and drying the reaction product to obtain basic nickel carbonate nanowires; preparing a 2-methylimidazole solution, ultrasonically dispersing the basic nickel carbonate nanowires in the prepared 2-methylimidazole solution, aging at room temperature, and washing and drying the aged product to obtain Ni-MOF layered nanosheets; mixing the Ni-MOF layered nanosheets with selenium powder in a specified ratio and grinding the mixture; and conducting a selenization reaction on the ground product in a protective gas environment to obtain the hierarchical hollow microspherical nickel selenide / nitrogen-doped porous carbon composite material. This invention can shorten the sodium ion transport path, alleviate the volume expansion during sodium ion insertion / extraction, and exhibits structural stability, high capacity, and high rate capability.

This invention relates to a nickel-iron selenide / carbon-nitrogen composite carbon nanotube anode material, its preparation method, anode sheet, and lithium battery, belonging to the field of electrode material technology. It solves the problem of poor cycle stability and discharge specific capacity caused by severe volume expansion in existing bimetallic selenide anode materials. The anode material comprises carbon nanotubes and cubic secondary particles composed of primary nickel-iron selenide particles; the primary nickel-iron selenide particles are carbon-coated particles, and the carbon is N-doped; the nickel selenide and iron selenide in the primary nickel-iron selenide particles form a heterostructure; the carbon nanotubes connect adjacent cubic secondary particles by penetrating them. This anode material exhibits good cycle stability, discharge specific capacity, and conductivity.

The invention discloses a preparation method of a nickel selenide-zinc selenide composite material for treating uranium-containing wastewater, and particularly relates to the field of photocatalytic materials. Comprising the following steps: S1, adding a nickel source, a zinc source and a selenium source into a reaction container, adding 30-60 mL of a solvent into the reaction container, stirring at room temperature for 10-30 min, and fully and uniformly mixing to obtain a first mixed solution; s2, adding 5-15 mL of an acidic solvent into the solution obtained in the step S1, and stirring for 5 min to obtain a second mixed solution; s3, carrying out heat preservation on the second mixed solution at 160-220 DEG C for 8-24 hours, and then cooling to room temperature to obtain a mixture; and S4, carrying out centrifugal treatment on the mixture obtained in the step S3, washing the centrifuged precipitate with deionized water and ethanol, and carrying out vacuum drying at 40-80 DEG C for 4-12 h to prepare the nickel selenide / zinc selenide composite photocatalyst. According to the technical scheme, the problem that an existing photocatalyst is low in uranium catalytic reduction capacity is solved, and the uranium treatment effect is improved.

The invention is applicable to the technical field of electrocatalysts, and provides an amorphous ferronickel hydroxide and crystal nickel selenide heterostructure and a preparation method and application thereof, and the preparation method comprises the following steps: preparing NiFe LDH as a precursor through a hydrothermal method, and then preparing a crystalline-amorphous NiSe / NiFe (OH) x nano-particle heterostructure through a solvothermal method; the unique crystalline-amorphous composite structure makes full use of the excellent conductivity of NiSe, and combines the abundant active sites and defect distribution of NiFe (OH) x, thereby significantly enhancing the interface charge transfer capability and accelerating the reaction kinetics process. Besides, the structure also optimizes the electronic structure of Ni and Fe active centers, effectively promotes the conversion of reaction intermediates, reduces the energy barrier in the reaction process, and finally greatly improves the catalytic performance of oxygen evolution reaction (OER). According to the invention, a multifunctional electrocatalyst is developed through the synergistic effect of interface engineering and amorphous-crystal, and a brand new path is opened up for the design of a high-performance heterostructure.

The invention discloses a preparation method and application of a non-noble metal Ni-based oxygen evolution catalyst. The catalyst provided by the invention comprises nickel selenide nanoparticles and graphene quantum dots loaded on the surfaces of the nickel selenide nanoparticles, wherein the mass ratio of the graphene quantum dots to the nickel selenide nanoparticles is (1-8): 50. The graphene quantum dots can be loaded on the surface of nickel selenide through a simple hydrothermal reaction, the preparation method is simple and convenient, the overpotential of an oxygen evolution reaction can be greatly reduced while the cost of the prepared catalyst is reduced, and the catalyst has relatively high electrochemical performance and stability in an anion exchange membrane electrolytic cell and is suitable for industrial production. Wide application prospects are realized.