53 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 relates to an alkaline system urea oxidation catalyst and a preparation method thereof, a two-step hydrothermal method is adopted, nickel salt, cobalt salt and tungstate are subjected to a hydrothermal reaction to prepare a carbon cloth supported catalyst precursor WCoNi-pre / CC, then a selenylation hydrothermal reaction is performed, and a bimetallic doped W, Co-NiSe2 / CC catalyst is obtained through high-temperature calcination. According to the catalyst, due to double-atom doping of W and Co, the electronic structure of nickel selenide is changed, the conductivity of the catalyst is improved, charge transfer in the catalysis process is promoted, the reaction rate is increased, the catalytic activity of the composite catalyst is further improved, and the composite catalyst can be directly used as a urea fuel cell anode material to be applied to UOR reaction.

The invention relates to the technical field of nano material preparation and application, in particular to a transition metal selenide catalyst and a preparation method and application thereof.The preparation method comprises the steps that firstly, metal nickel salt, ferric salt, urea and ammonium fluoride are dissolved in deionized water, and a nickel-iron layered hydroxide nanosheet precursor is synthesized through a hydrothermal method; secondly, preparing an iron-doped nickel selenide catalyst by adopting a selenylation reaction; the electronic structure of nickel selenide is regulated and controlled by utilizing an iron doping strategy, and the catalytic performance is improved. The prepared iron-doped nickel selenide catalyst has good catalytic activity when being used for hydrogen evolution reaction and sulfur ion oxidation reaction. In a two-electrode sulfur ion oxidation coupling hydrogen production electrolytic tank, the current density of 10mAcm <-2 > can be output only by the voltage of 0.439 V, and the targets of efficient and energy-saving hydrogen production and sulfur ion oxidation upgrading into a high-added-value elemental sulfur product are achieved. The method has the advantages of simple and controllable preparation process, low raw material price, easiness in batch production and the like, and can be used as a catalyst for efficient water electrolysis hydrogen production and sulfur ion oxidation reaction.

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 discloses a material for synergistically producing water and generating electricity based on interface evaporation and a preparation method and application thereof.The preparation method comprises the steps that foamed nickel processed through laser serves as a substrate, selenium powder serves as a main raw material, ethylene glycol and ethylenediamine serve as main solvents, the solvent concentration and the adding amount of the selenium powder are controlled, and foamed nickel / nickel selenide is synthesized through a solvothermal method; then hexadecyl trimethoxy silane is sprayed on the upper layer, vacuum drying is conducted, then the material with the Janus structure is prepared, the wettability of the upper surface and the wettability of the lower surface of the material are different, and the material is combined with a thermoelectric power generation module so that electricity can be generated synchronously while water is generated. The Janus foamed nickel / nickel selenide not only can perform seawater desalination through interface evaporation, but also can combine a sample with a TE module in a wet state, and the sample receives sunlight heat and transfers the sunlight heat to the upper surface of the TE module, so that temperature difference is generated on the upper surface and the lower surface of the module to perform thermoelectric power generation.

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 invention discloses a method for surface reconstruction of a ligand-regulated oxygen evolution catalyst, the catalyst and application of the catalyst. The methods involve ligand tuned surface reconstruction capable of simultaneous incorporation of doped cations and oxygen vacancies to improve the catalytic activity of the OER. Surface engineered heterointerface structures consisting of nickel-based precatalysts and (oxy) hydroxides have been developed based on the ligand-induced delayed doping effect using ammonia complexes in alkaline electrolytes by using nickel telluride, nickel oxide, nickel sulfide or nickel selenide as the precatalyst. The method is simple in process, easy to operate and capable of being industrially popularized; and the prepared oxygen evolution catalyst has the characteristics of abundant active sites and oxygen vacancies, large chemical active surface area, good stability, controllability and low cost.

The present invention belongs to the field of electrode materials and industrial catalysis technology, and specifically relates to an iron-doped nickel hydroxide composite nickel selenide material and its preparation method and application. The iron-doped nickel hydroxide composite nickel selenide material provided by the present invention comprises a conductive substrate, NiSe nanosheets loaded on the conductive substrate; and Fe-doped Ni(OH)2 loaded on the surface of the NiSe nanosheets; the morphology of the Fe-doped Ni(OH)2 is a nanosheet; the Fe element in the Fe-doped Ni(OH)2 is doped into the Ni(OH)2 crystal. The iron-doped nickel hydroxide composite nickel selenide material provided by the present invention has the advantages of excellent intrinsic electrocatalytic activity, high electrochemical active area and good stability, and exhibits excellent water electrolysis performance in an alkaline anion exchange membrane water electrolyzer under high current density conditions.

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 invention relates to a method for in-situ growth of Ni0.85Se on the surface of a carbon nanofiber and an application of the method in the field of urea oxidation assisted full water splitting hydrogen production. According to the preparation method, the porous nickel / carbon nanofibers (Ni-PCNFs) are successfully prepared by introducing a pore-forming agent by utilizing an electrostatic spinning technology, the surfaces of the carbon nanofibers are successfully and uniformly coated with Ni0.85Se nanoparticle shells by adopting a one-step hydrothermal synthesis method, the preparation process is simple, the process conditions are easy to control, and the components of the generated nickel selenide are controllable. The prepared nano composite material shows excellent electro-catalysis urea oxidation performance and can be used as an effective substitute for an anode oxygen evolution reaction to assist in full water splitting for hydrogen production, and the current density of 10 mA cm <-2 > can be achieved only by 1.39 V potential of an electrolytic bath formed by the nano composite material and commercial Pt / C.

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 invention discloses a preparation method and application of a porous nickel diselenide nanowire, and relates to the field of energy storage material preparation and performance research, the preparation process is as follows: firstly, under the condition of no template and surfactant, a soluble nickel salt and an alkali mixture are subjected to a hydrothermal reaction to obtain a precursor nickel hydroxide nanowire; and then under the protection of inert gas, performing heat treatment on the precursor by using selenium powder to obtain the nickel diselenide nanowire with a porous structure. The preparation method disclosed by the invention is simple and easy to implement, does not need a template, a surfactant and complex equipment, and is low in cost; the prepared nickel diselenide nanowire has a porous structure, has a large specific surface area, and has a wide application prospect in the fields of energy storage, catalysis and the like. The prepared porous nickel diselenide nanowire is used as a supercapacitor electrode material, shows large specific capacity, good rate capability and excellent cycling stability, and is a supercapacitor positive electrode material with application prospects.

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 invention relates to a preparation method of a bi-component selenide with a three-dimensional interwoven structure and application of the bi-component selenide in the technical field of catalysis for hydrogen production through full water splitting. The crystalline nickel selenide nanowires are constructed on the surface of the amorphous selenide through two-step reaction, due to the synergistic effect between the two components and the three-dimensional interlaced nanostructure of the two components, the prepared catalyst shows excellent HER and OER activity under the alkaline condition, and when the catalyst serves as a cathode and an anode of a full-water-splitting electrolytic cell, the catalytic activity of the catalyst is improved, and the service life of the catalyst is prolonged. And the catalyst also shows excellent full water splitting performance and stability, and can stably operate for more than 200 hours under the current density of 100 mA cm <-2 >. The invention provides a new idea for designing and preparing a high-efficiency and high-stability complete water splitting catalyst with a bifunctional catalytic characteristic.

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.

A tantalum nickel selenide mid-infrared detector based on microstructure regulation according to the present invention has a silica layer provided on an intrinsic high-resistance silicon substrate. A plasmonic microstructure and a grating structure are provided on the silica layer. The grating structure is arranged at a distance from the plasmonic microstructure. A tantalum nickel selenide nanosheet is covered on the plasmonic microstructure and the grating structure. A hexagonal boron nitride nanosheet protection layer is covered on the tantalum nickel selenide nanosheet. The present invention utilizes the energy band alignment of tantalum nickel selenide and gold, and realizes the synergistic effect of enhanced mid-infrared absorption and asymmetric temperature distribution in the microstructure region with the plasmonic microstructure and the grating microstructure in the microstructure, so as to achieve efficient mid-infrared self-driven detection, high response speed, high efficiency, and high-performance infrared detection.

The invention provides a nickel selenide / tin selenide heterojunction composite material as well as a preparation method and application thereof, and relates to the technical field of battery negative electrode materials. The nickel selenide / tin selenide heterojunction composite material is of a ball-flower morphology structure, the ball-flower morphology structure is formed by stacking a plurality of nanosheets, the nanosheets comprise nickel selenide and tin selenide loaded on the surface of the nickel selenide, and a heterojunction is formed on a connection interface of the nickel selenide and the tin selenide. The preparation method of the nickel selenide / tin selenide heterojunction composite material comprises the following steps: (1) dissolving tin chloride pentahydrate and nickel chloride hexahydrate in water to form a reaction solution, adding alkali to adjust the pH value of the reaction solution to 8-12, and carrying out hydrothermal reaction to obtain a precursor; and (2) uniformly mixing the precursor and selenium powder, and performing calcination reaction in an inert atmosphere to obtain the nickel selenide / tin selenide heterojunction composite material. The nickel selenide / tin selenide heterojunction composite material prepared by the invention can effectively improve the conduction performance of electrons and ions, and has excellent sodium ion storage performance and cycling stability.

The invention discloses a koelreuteria paniculata leaf-shaped nickel selenide / vanadium selenide self-supporting composite electrode and a preparation method and application thereof.The preparation method comprises the steps that selenium powder serves as a selenium source, lauryl sodium sulfate and polyvinylpyrrolidone serve as morphology regulating agents, and a vanadium source and an alkali source are mixed to be uniform; a nickel-vanadium-based hydroxide precursor is synthesized on foamed nickel in situ by adopting a hydrothermal reaction method, then selenium powder is added into the precursor, and the integrated Ni3Se2 / V5Se8 / NF self-supporting composite electrode is prepared by adopting a pyrolysis method. On one hand, the oxidation-reduction process in the electrochemical reaction process is accelerated, and the adsorption energy barrier of a reaction intermediate is reduced, so that the catalytic performance of the material is improved; on the other hand, electron transfer in the electro-catalytic reaction process is improved, the catalytic activity is promoted to be improved, it is effectively guaranteed that strong interaction can be formed between the active material and the NF substrate, and the NF substrate shows good mechanical stability and deformation resistance in electrochemical application.

The invention discloses preparation of a lanthanum-doped nickel phosphide and nickel selenide heterojunction catalyst and application of the lanthanum-doped nickel phosphide and nickel selenide heterojunction catalyst in urea electrocatalytic oxidation. A hydrothermal-carbon coating-low-temperature selenium phosphorization method is adopted, foamed nickel is used as a nickel source and a conductive substrate, and the lanthanum-doped nickel phosphide and nickel selenide heterojunction electrocatalyst growing on the foamed nickel in situ is prepared. The catalyst shows a porous nanosheet shape, and the structure is beneficial to infiltration of electrolyte and exposure of active sites, and is beneficial to improvement of the overall performance and enhancement of the overall stability of the catalyst. Through doping of lanthanum and construction of a heterostructure, compared with commercial RuO2 / NF, the lanthanum-doped nickel phosphide and nickel selenide heterojunction catalyst prepared by the preparation method disclosed by the invention shows higher catalytic performance on a urea oxidation reaction.

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.