16 results about "Nickel selenide" patented technology

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 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 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 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 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.