80 results about "Nickel selenide" patented technology

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 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 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 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 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 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.