81 results about "Nickel selenide" patented technology

The invention discloses a nickel selenide / graphene sodium ion battery composite negative material as well as a preparation method and application thereof. The composite material is formed by compounding nanoscale nickel selenide and graphene, wherein the nickel selenide is in an octahedral block shape, and the content of the nickel selenide is 60 to 90 percent of the mass of the nickel selenide / graphene sodium ion battery composite negative material. The preparation method comprises the steps: preparing a nickel source dispersed with graphene, mixing the nickel source and a selenium source, performing a hydrothermal reaction, filtering, washing, and drying in vacuum to obtain a needed product. The prepared nickel selenide / graphene sodium ion battery composite negative material is stable in structure, good in conducting performance and excellent in rate capability and cycling stability when used as a sodium ion battery negative material. The method is low in cost, relatively low in energy consumption, convenient in control, friendly to the environment, suitable for the real application of a sodium ion battery and capable of realizing the industrialized mass production.

The invention belongs to the technical field of nanometer material, relates to a synthetic method for preparing porous hollow nanospheres with uniform appearance through a hydrothermal process, and particularly relates to a preparation method of porous nickel selenide hollow nanospheres. The preparation method comprises the steps as follows: positioning selenium dioxide and nickel nitrate into alkaline aqueous solution of ammonia water; and preparing the porous hollow nanospheres through the hydrothermal process under the reduction effect of hydrazine hydrate. The nickel selenide hollow nanospheres prepared by the preparation method provided by the invention have the diameter of 300 to 400nm, and are formed by self-assembling 30 to 50nm of porous nickel selenide. The preparation method provided by the invention is simple in technology, and high in repeatability; and the used nickel source and selenium source are the inorganic compounds, low in cost, easy to obtain, low in cost, and meets the environment-friendly requirement; the method can be conducted without pre-processing such as ageing and roasting; the resultant temperature is low, therefore, the energy consumption and the reacting cost are reduced; and the mass production can be conveniently conducted.

The invention discloses a honeycomb nickel selenide nanosheet array electrode material and a preparation method thereof, and belongs to the technical field of supercapacitor electrode material preparation. The honeycomb nickel selenide nanosheet array electrode material is prepared according the steps of mixing Se powder and an Na2SO3 solution, and preparing an Na2SeSO3 solution with certain concentration through heating and refluxing; adding the prepared Na2SeSO3 solution into a high-pressure reactor, then adding preprocessed foamed nickel into the N2SeSO3 solution, controlling the reaction temperature and time, and acquiring a honeycomb nickel selenide nanosheet array. The acquired electrode material has excellent electrochemical performance, the specific capacitance can reach up to 3105F / g when the current density is 1.0A / g, and the specific capacitance can still reach up to 1460F / g even if the current density reaches up to 10A / g. The honeycomb nickel selenide nanosheet array electrode material is prepared by adopting a one-step hydrothermal method, and is cheap in raw material, simple to operate, low in cost, high in efficiency, free of impurities and high in purity. The honeycomb nickel selenide nanosheet array electrode material is applicable to supercapacitors.

The invention belongs to the technical field of transition-metal chalcogenide-carbon material and specifically relates to a nickel selenide / hollow carbon-fibre composite and a preparation method thereof. The preparation process comprises the following steps: preparing hollow carbon fiber by the use of high-temperature carbonized cotton, then growing vertical nickel hydroxide nanosheet in situ on the hollow carbon fiber by a chemical bath deposition method, and finally selenizing the obtained nickel hydroxide / hollow carbon fiber composite so as to prepare the nickel selenide / hollow carbon-fibre composite. The prepared carbon fiber is a hollow structure and has large specific surface area and good conductivity. The preparation process is simple, and cost is low. The morphology of the finally prepared nickel selenide / hollow carbon-fibre composite is controllable. Nickel selenide uniformly grows on the internal and external tube walls of the hollow carbon nanofiber. By full utilization of the unique hollow tube structure and high specific surface area of the hollow carbon fiber, the product can be used as an ideal high-performance electrocatalysis material as well as an electrode material of new energy devices such as a sodium-ion battery and a supercapacitor, etc.

The invention discloses a graphene and nickel diselenide composite and a preparation method thereof. The preparation method comprises the steps that a reducing agent is mixed with a graphene oxide solution, even stirring is conducted to form a brown solution, the brown solution is added into a stainless steel reaction kettle with a polytetrafluoroethylene liner, and selenium containing matter and nickel containing inorganic salt are filled into the reaction kettle; the reaction kettle is closed to conduct the reaction; after the reaction is conducted, natural cooling is conducted, suction filtration is conducted on a mixture in the reaction kettle, repeated washing and suction filtration are conducted through distilled water and absolute ethyl alcohol, and the product is collected for storing after drying is conducted. According to the prepared graphene and nickel diselenide composite, nickel diselenide nanoparticles are wrapped with the graphene, nickel diselenide is closely combined with graphene sheets, and the composite has larger specific surface area. According to the graphene and nickel diselenide composite and the preparation method thereof, a simple solvothermal method is adopted, reduction of graphene oxide and preparation of the graphene oxide and the nickel diselenide composite are conducted synchronously, the technology is simple, the reaction temperature is low, the cost is low, the preparation method is green and controllable, and the graphene and nickel diselenide composite is suitable for industrial production.

The invention relates to a cobalt-nickel selenide nitrogen-doped amorphous carbon nano composite negative electrode material as well as preparation and application thereof. The preparation method specifically comprises the following steps of (a) adding a cobalt source, a nickel source and hexadecyl trimethyl ammonium bromide into a 2-methylimidazole aqueous solution, stirring to form a mixed solution, standing and separating to obtain a precipitate, washing and drying to obtain NiCo-ZIF-67; and (b) selenizing the NiCo-ZIF-67 obtained in the step (a) by adopting elemental selenium, and then washing and drying to obtain the cobalt-nickel selenide nitrogen-doped amorphous carbon nano composite negative electrode material. The cobalt nickel selenide nitrogen-doped amorphous carbon nano composite negative electrode material is prepared into a sodium-ion battery negative electrode plate, and then the sodium-ion battery negative electrode plate, a metal sodium plate and an electrolyte are assembled into a sodium-ion battery. Compared with the prior art, the nano composite negative electrode material provided by the invention improves the electrochemical performance of the battery, has excellent electrochemical sodium storage performance, and is a good sodium ion battery negative electrode material.

The invention discloses a solvothermal preparation method for an in-situ electrode. The solvothermal preparation method specifically comprises the following steps of dissolving metallic nickel salt, thiourea or selenium powder and ethylenediamine in ethylene glycol solution, adding a transparent substrate material, filling in a hydrothermal kettle, performing solvothermal at 140-230 DEG C for 3-24 h, taking out the transparent substrate, cleaning, and drying so as to obtain the transparent in-situ electrode. Areagent used in the invention is cheap; the preparation method is simple; and furthermore, the prepared in-situ nickel sulphide and nickel selenide electrode has relatively high electrocatalytic activity.

The invention relates to a universal preparation method for synthesizing a carbon-coated nickel metal compound with various morphologies as a sodium ion battery negative electrode material by utilizing a metal organic framework design. The method comprises the following steps: dissolving an organic ligand, a nickel source and a surface dispersant into a mixed solvent according to a certain ratio,and controlling hydrothermal reaction time to generate nickel-containing metal organic frameworks with different morphologies (solid spheres, core-shell spheres and hollow spheres); the carbon-coatednickel-containing compounds (nickel oxide, nickel phosphide, nickel sulfide, nickel selenide and nickel telluride) with the shape similar to that of a template are synthesized by taking the frameworksas the template and adjusting an anionic ligand and utilizing an ion exchange strategy. The preparation method has the advantages that the morphology is adjustable; the components are rich; conditions are easy to control; the operation is simple; the conversion efficiency is high; the synthesis method has universality and can be expanded to synthesis of other types of carbon-coated metal compounds; and the product has high specific capacity and good rate capability.

The invention discloses a transition metal selenide modified molded demercuration material and a preparation method thereof. The transition metal selenide modified molded demercuration material comprises a molded carrier and an active component loaded on the molded carrier, wherein the active component is a transition metal selenide, and the transition metal selenide is selected from one or more of copper selenide, nickel selenide, zinc selenide or iron selenide. The preparation method comprises the following steps: firmly and uniformly loading a certain amount of a transition metal on the molded carrier by adopting a wet chemical reduction method, and converting the transition metal into the transition metal selenide by adopting an in-situ selenylation method, thereby obtaining the transition metal selenide modified molded demercuration material. The preparation method is simple, the obtained transition metal selenide modified molded demercuration material is large in adsorption capacity, good in mechanical property, fluid property and plasticity, and is suitable for different demercuration application occasions, and the secondary release risk of mercury is reduced.

The invention provides a nickel selenide / carbon nanotube composite nanometer material and a preparation and an application thereof, and relates to the technical field of nanometer materials. The nickel selenide / carbon nanotube composite nanometer material is a nanometer wire which is 10-50 nanometers long, wherein nanometer spherical nickel selenide with the average particle size being 5-20nm is attached onto carbon nanotubes. The nickel selenide / carbon nanotube composite nanometer material of uniform shape is synthesized by a hydrothermal method, and the material has a large specific surface area. The carbon nanotubes effectively alleviate the size change of nickel selenide in the process of charging and discharging, and reduce electrode capacity attenuation. Moreover, the carbon nanotubes can increase the conductivity of selenide nickel electrodes. When the prepared nickel selenide / carbon nanotube composite nanometer material is used as the negative electrode of a super capacitor, the super capacitor has high charge and discharge specific capacitance and a long cycle life. Moreover, there is a rich source of raw materials, the production cost is low and controllable, and the material is suitable for industrialized production.

The invention discloses a preparation method of a dodecahedral hollow cobalt-nickel selenide / iron oxyhydroxide composite catalyst, and can solve the problems of high price, poor stability and the likeof noble metal electrode materials. The preparation method comprises the following steps: mixing cobalt nitrate hexahydrate, dimethylimidazole and methanol, and conducting stirring at room temperature to obtain ZIF-67; mixing the obtained material, nickel nitrate hexahydrate and ethanol, and conducting stirring at room temperature to obtain CoNi-LDH; carrying out selenylation treatment on the obtained material and selenium powder by adopting a chemical vapor deposition method to obtain (Co,Ni)Se2 / C; and subjecting the obtained selenide and ferrous sulfate heptahydrate to a chemical water bathdeposition method, so as to obtain (Co,Ni)Se2 / C-coated FeOOH. According to the invention, the cobalt-nickel-based selenide / iron oxyhydroxide composite material with the hollow cage-shaped nano structure is prepared by a simple and convenient chemical water bath deposition method, and the material shows excellent electrochemical properties such as relatively low overpotential, good stability and the like in an oxygen evolution reaction.

The invention discloses a preparation method of an amorphous CoMoS4 / NiSe nanosheet array composite material, which comprises the following steps: (1) under hydrothermal conditions, cobalt nitrate hexahydrate reacts with sodium molybdate heptahydrate, and a CoMoO4 nanosheet array is grown on foam nickel; (2) sodium sulfide and the CoMoO4 nanosheet array react hydrothermally to form an amorphous CoMoS4 nanosheet array; and (3) under hydrothermal conditions, nickel chloride hexahydrate, selenium dioxide and urea react to form amorphous NiSe, and the amorphous NiSe is deposited on the surface of the amorphous CoMoS4 nanosheet array to obtain an amorphous CoMoS4 / NiSe nanosheet array composite material finally. The preparation method is simple and low in cost, and the prepared amorphous CoMoS4 / NiSe nanosheet array composite material has high specific capacitance and good cyclic stability, can be applied to super capacitor electrode materials and has a good application prospect.

The invention relates to a method for preparing ultra-thin porous nickel selenide nanosheet array by etching manganese-doped nickel hydroxide, which relates to the technical field of electrode materials for supercapacitors. As that electrode material structure of the exist transition metal selenide nano-sheet is unreasonable, if the electrode material is an ultra-thin nano-sheet structure, the electrode material cannot be porous, and the ion mobility and the contactable active site are affect; the electrode material structure of the transition metal selenidenano-sheet is unreasonable. If the nanosheets are porous, the thickness is too thick, the contact active sites are too few, and the energy storage is too low, so the capacitance performance is too low. Methods: 1. Preparation of reaction solution; 2, preparing a manganese doped nickel hydroxide nano sheet array; 3, selenide treatment; Fourthly, acid etching, that is, a method of preparing ultrathin porous nickel selenide nanolithicarray by etching manganese-doped nickel hydroxide is completed. The invention provides the method used for preparing ultra-thin porous nickel selenide nanosheet array by etching manganese doped nickelhydroxide.

The invention provides a preparation method of a Ni0. 85Se@NC electro-catalytic material, which comprises the following steps: S1, preparing a nickel-based metal organic framework nanosheet by solvothermal reaction, and marking as Ni-MOF, namely [Ni(HBTC) (DABCO)3DMF]; S2, heating and annealing the nickel-based metal organic framework nanosheet in a programmed heating manner, and naturally coolingto obtain nitrogen-doped carbon-coated nickel nanoparticles named as Ni@NC; S3, uniformly mixing the Ni@NC with commercial selenium powder, heating and annealing in a programmed heating manner, and naturally cooling to obtain nitrogen-doped carbon-coated nickel diselenide nanoparticles which are recorded as NiSe2@NC; and S4, enabling the NiSe2@NC to be subjected to high-temperature calcination for 2h at the temperature of 750 DEG C to 850 DEG C, and preparing and marking nitrogen-doped carbon-coated nickel selenide nano particles as Ni0.85Se@NC. Compared with the prior art, the method provided by the invention has the advantages and positive effects that a controllable method for phase change from nickel selenide of an orthorhombic system to nickel selenide of a hexagonal phase is provided, and guidance is provided for synthesis and optimization of a nickel selenide material phase.

The invention discloses a white-beech-mushroom-shaped nickel selenide 2 nano-array electrode material and a preparation method thereof, and belongs to the technical field of supercapacitor electrode material preparation. The preparation method specifically comprises the following steps: a certain amount of selenium powder and a sodium hydroxide solution are mixed, hydro-thermal treatment is conducted in a reaction kettle with a polyphenylene liner, and thus a reaction solution is prepared; after the reaction solution is naturally cooled, pretreated foamed nickel is placed into the reaction solution for secondary hydro-thermal treatment; and the reaction temperature and time are controlled, and thus a white-beech-mushroom-shaped nickel selenide 2 nano-array can be obtained. The obtained electrode material has excellent electrochemical properties, the specific capacitance at the electric current density of 1.0 A / g can reach 2357 F / g, and the specific capacitance of the electrode materialcan still reach 1290 F / g even when the electric current density reach 5 A / g.

The invention discloses a 0D / 2D NiSe2 / ZnIn2S4 composite photocatalyst, a preparation method thereof and application of the 0D / 2D NiSe2 / ZnIn2S4 composite photocatalyst in hydrogen production by visible light catalytic decomposition of water. The composite photocatalyst is formed by taking flower-shaped microspheres assembled by two-dimensional ZnIn2S4 nanosheets as a main body and uniformly loading zero-dimensional NiSe2 nanoparticles on the surface of the flower-shaped microspheres. According to the invention, tight interface contact between NiSe2 nanoparticles and ZnIn2S4 nanosheets is constructed, reaction sites are fully exposed, and effective separation of photo-induced electron-hole pairs is facilitated. And the NiSe2 nanoparticles have good conductivity and high work function characteristics, so that rapid transfer of charges is facilitated. Compared with pure ZnIn2S4, the photocatalytic activity of the composite photocatalyst prepared by the method under visible light is obviously improved, and the composite photocatalyst has good stability. The preparation method is simple, mild in condition, rich in raw material source, low in cost, environment-friendly and easy to popularize on a large scale.

The invention provides a tungsten-doped nickel selenide sulfide film coated nickel selenide sulfide nanorod growing on the surface of foamed nickel and a preparation method and application of the nickel selenide sulfide nanorod. The preparation method comprises the following steps: putting a selenium source into hydrazine hydrate, carrying out mechanical stirring and dissolving to obtain a selenium source mixed solution, adding thiourea, ammonium fluoride and a tungsten source into the selenium source mixed solution, and then adding absolute ethyl alcohol and deionized water to finally obtaina mixed solution; and pouring the mixed solution into a reaction kettle with a polytetrafluoroethylene lining, putting pretreated foamed nickel into the reaction kettle, carrying out hydrothermal treatment, carrying out cooling to room temperature of 20-25 DEG C, performing cleaning and drying, and carrying out annealing in a protective atmosphere. The preparation method is simple in preparation process, convenient to operate and high in repeatability; and the nickel selenide sulfide nanorod wrapped by a monatomic tungsten doped nickel selenide sulfide thin film growing on the foamed nickel insitu is uniform in distribution and large in length-diameter ratio, can be directly used as an electrode, does not need additional addition of a binder and a conductive agent, and has excellent energy catalytic application prospects.

The invention belongs to the technical field of nano materials, in particular to a preparation method and application of a nickel selenide / molybdenum selenide composite nano electrocatalyst. The preparation method comprises the following steps that: 1, molybdenum salt, nickel salt, 2-methylimidazole and sodium sulfate are dissolved in deionized water to obtain a mixed solution, and a precursor isobtained after hydrothermal reaction, cooling, washing and drying are performed; and (2) calcining the precursor in a nitrogen atmosphere, and carrying out selenylation treatment in H2 / Ar2 mixed gas to obtain the nickel selenide / molybdenum selenide composite nano electrocatalyst. The NiSe / MoSe2 multilevel structure nano-particles prepared by the method are uniform in size, stable in structure anduniform in component distribution; the material is endowed with better electrocatalytic performance and stability; the catalytic material is of a nano-particle structure assembled by two-dimensional nanosheets, and the structure is more beneficial to ion transmission, and the conductivity of the material is improved.

The invention provides a method for preparing nano nickel selenide with an octahedral structure, and belongs to the technical field of preparation of nano materials. The method is characterized by comprising the following steps of: adding 0.1314 gram of nickel sulfate hexahydrate and 0.0866 gram of sodium selenite into a 25-milliliter high-pressure reaction kettle with a polytetrafluoroethylene lining, adding 20 milliliters of ethylene glycol, stirring for 20 minutes, closing the reaction kettle, putting into a digital display temperature control furnace, and reacting for 24 hours at the temperature of 180 DEG C; and performing three times of centrifugal washing on the obtained sample, drying, and thus obtaining the product. An organic template and a surfactant are not required in the method, and the nano nickel selenide is synthesized in one step and has high yield and the octahedral structure; the method is simple, energy-saving and suitable for industrialized production; and the obtained octahedral nickel selenide has a good catalytic effect on decomposition of hydrazine hydrate.

The invention discloses a method for preparing CC (carbon cloth) supported nickel selenide on the basis of a solution method. The method comprises steps as follows: a precursor solution is prepared asfollows: nickel hydroxide powder and selenium powder are dissolved in a hydrosulfamine solution in the mole ratio being 0.98-1.02, wherein the hydrosulfamine solution is formed by dissolving ethanediamine and dithioglycol in the volume ratio being 4:1, and the concentration of the precursor solution is 0.145 mmol / mL; the precursor solution is dropped on CC in the dropping amount of 0.14-0.2 mL / cm<2>; the CC is put on a heating plate to be heated at the temperature of 300-400 DEG C for 40-80 s, and CC supported nickel selenide (NiSe / CC) is obtained. The CC supported nickel selenide is preparedwith the solution method, a preparation process is greatly simplified, the preparation time is shortened greatly, and the preparation cost is reduced.

The invention discloses a preparation method and application of a composite oxygen evolution electrode of self-supporting iron oxyhydroxide and iron-doped nickel selenide, and belongs to the technical field of hydrogen and oxygen preparation through water electrolysis. The method comprises the following steps: (1) placing foamed ferronickel in absolute ethyl alcohol; and (2) dissolving selenium powder and sodium borohydride in deionized water to obtain an aqueous solution, mixing the aqueous solution with the solution obtained in the step (1), and preparing the nano catalytic oxygen evolution electrode with the self-supporting structure by utilizing a hydrothermal reaction process. The technical method and the synthesis process are simple, the raw materials are low in price, and the prepared self-supporting iron-nickel-selenium ternary composite oxygen evolution electrode is used for preparing hydrogen and oxygen by electrolyzing a potassium hydroxide aqueous solution and is high in oxygen evolution activity.

The invention discloses a carbon-coated nickel selenide ultrathin nanosheet composite material. The composite material is composed of nickel selenide particles with the particle size of 150-350 nm andcarbon nanosheets with the thickness of 15-50 nm, the nickel selenide particles are coated with the carbon nanosheets, and the carbon nanosheets form a three-dimensional flower-like structure. The preparation method comprises the following steps of dropwise adding ethanol solution of 2-methylimidazole into ethanol solution of nickel nitrate hexahydrate while carrying out ultrasonic treatment, then dropwise adding ethanol solution of benzimidazole into mixed solution, carrying out sufficient stirring reaction at room temperature, washing with absolute ethyl alcohol to be clean, and drying to obtain a precursor; and uniformly grinding the precursor and selenium powder, calcining for 2-6 hours at 500-800 DEG C under the protection of argon, and naturally cooling to room temperature to obtainNiSe-C powder. According to the NiSe-C nanoflower composite material prepared by the method, a problem of volume expansion of a metal selenide electrode material in the charging and discharging process can be effectively relieved, and cycle performance of a battery is improved.

The invention provides a preparation method of a nickel-based metal organic framework derived nickel diselenide / reduced graphene oxide composite material, and the nickel diselenide / reduced graphene oxide composite material prepared by the method has a nano-particle structure and a large specific surface area, can effectively improve the ion transmission rate, and improves the specific capacitance. The problems of poor conductivity, poor cycle performance and the like of nickel-containing electrodes are solved.

The invention introduces a nickel selenide / nickel hydroxide composite material applied to a supercapacitor and a preparation method of the nickel selenide / nickel hydroxide composite material, and belongs to the technical field of a new energy material. Inorganic nickel salt and hydrazine hydrate are used, a nickel selenide precursor is obtained by hydrothermal reaction under a condition of an aqueous solution, and a composite material of nickel selenide and nickel hydroxide is further obtained by hydrogen peroxide. The strategy is opposite to a traditional strategy of preparing the composite material of metal oxide and hydroxide, and the obtained composite material fabricated by the method has excellent supercapacitor performance and has important guidance significance to fabrication of anelectrode material of the high-performance supercapacitor.

The invention discloses a molybdenum disulfide / nickel selenide composite material as well as a preparation method and application thereof. The invention relates to a composite material as well as a preparation method and application thereof, and aims to solve the problems that an existing noble metal catalyst for hydrogen evolution reaction is expensive, large-scale industrial production is not facilitated, the quality of a composite catalyst substrate is high, and the catalytic activity requirement cannot be satisfied. The composite material is composed of molybdenum disulfide and nickel selenide nanoparticles, and the outer surfaces of the nickel selenide nanoparticles are coated with the molybdenum disulfide. The preparation method comprises the following steps: 1, preparing nickel selenide nanoparticles; and 2, performing composition to obtain the molybdenum disulfide / nickel selenide composite material. The molybdenum disulfide / nickel selenide composite material is used for electrolyzing water to produce hydrogen. The molybdenum disulfide / nickel selenide composite material can be obtained.

The invention discloses a graphene-like carbon-coated nickel selenide composite material and a preparation method thereof. According to the method, a one-step calcining method is adopted for preparinga carbon-coated nickel selenide composite material; nickelocene and selenium powder are mixed uniformly and put into a reactor; and the temperature is increased to 600-700 DEG C for carrying out a calcination reaction for 5-15 hours so as to obtain the carbon-coated nickel selenide composite material. According to the method, one-step calcination synthesis is realized, the operation is simple, the reaction conditions are easy to control, and the method is more suitable for industrial production. The graphene-like carbon-coated nickel selenide composite material prepared from a nickel source and a selenium source in the method is few in byproduct and high in product yield. The composite material prepared with the method is applied to a battery positive electrode material, so that the battery capacity retention rate can reach 92%.

The invention relates to a sodium-ion battery negative electrode material preparation method, which comprises: preparing a nickel-based metal organic framework (Ni-BTC), and preparing a nickel selenide / nickel oxide (NiSe / NiO) composite sodium ion battery negative electrode material by using the nickel-based metal organic framework. Nickel selenide provides high capacity and conductivity, nickel oxide can effectively capture polyselenide generated in the charging and discharging process, loss of active substances is reduced, the hollow sphere structure can effectively relieve volume expansion generated in the charging and discharging process of the sodium ion battery, and the structural stability of the electrode is improved.

The invention discloses a cross-linked nano carbon plate loaded nickel selenide / manganese selenide nano composite material, a preparation method thereof and a sodium ion battery negative electrode. The preparation method comprises the following steps: performing high-temperature carbonization on trisodium citrate serving as a raw material in an inert atmosphere to prepare a cross-linked nano carbon plate material; dissolving a nickel source and a manganese source in water, adding the cross-linked nano carbon sheet material, stirring, dissolving and carrying out hydrothermal reaction in sequence, and washing and drying an obtained product to obtain a precursor material; enabling the precursor material and selenium powder to be subjected to a heating reaction in hydrogen and argon mixed gas, and obtaining a cross-linked nano carbon plate loaded nickel selenide / manganese selenide nano particle composite material. The material can load more nickel selenide / manganese selenide nanoparticles by taking the cross-linked nano carbon plate as a carrier, shortens electron and sodium ion transmission paths, improves the conductivity of an electrode material, and can be used as an active material of a sodium-ion battery negative electrode, so that the sodium-ion battery negative electrode with excellent cycling stability and rate capability is obtained.

The invention discloses an amorphous cobalt borate-nickel monoselenide@foamed nickel compound as well as a preparation method and application thereof, and belongs to the field of preparation of nano materials. According to the amorphous cobalt borate-nickel monoselenide@foamed nickel compound, in amorphous cobalt borate, electrons are reversely transferred from B to Co, so that a d-band track of Co is filled, a large number of active sites can be provided, reactants can move in all directions in the water decomposition reaction process due to the short-range orderliness, and the reaction flexibility is improved; and the nickel monoselenide and the amorphous cobalt borate have a synergistic effect, so that the nickel monoselenide and the amorphous cobalt borate not only can be used as a catalyst in an alkaline electrolyte to catalyze a full water decomposition process, but also can be used for catalyzing hydrogen evolution and oxygen evolution in acidic and neutral electrolytes at the same time. The compound provided by the invention has excellent hydrogen evolution and oxygen evolution double electrocatalytic properties in acidic, alkaline and neutral electrolytes.