11results about "Nickel sulfides" patented technology

The application belongs to the field of electrochemical catalysts, and particularly relates to a semiconductor phase MoS2 transition metal-based composite catalyst, a preparation method thereof and application of the semiconductor phase MoS2 transition metal-based composite catalyst in electrocatalytic synthesis of ammonia from N2O. The preparation method of the semiconductor phase MoS2 transition metal-based composite catalyst comprises the following steps: (1) dissolving molybdate and a sulfur-containing organic compound in water, then adding a soluble salt of a transition metal to form a uniform precursor solution by stirring; adding a phosphorization source into the precursor solution to uniformly disperse to obtain a mixed solution; (2) reacting the mixed solution in step (1) at 160-200 DEG C for 20-28 h, cooling to room temperature after the reaction is completed, and washing and drying the obtained product to obtain the semiconductor phase MoS2 transition metal-based composite catalyst. The application successfully constructs a close heterojunction of transition metal phosphide / sulfide and MoS2 in a MoS2-based composite structure through a one-pot hydrothermal-phosphorization synergistic preparation method.

The present application relates to the technical field of gasification metallurgy, and particularly relates to a production and preparation method of high-dissolution-performance sulfur-carbonyl nickel pellets, to solve the problem that the content of impurities in sulfur-containing nickel metal is high, the uniformity of S element distribution in the sulfur-containing nickel metal is poor, and the dissolution stability, plating solution stability and plating layer quality are greatly affected when traditional electrolytic method or smelting method is used to smelt nickel. The method can effectively remove the difficult-to-remove impurities in the group VIII metal and CO gas through selective reaction, and has lower metal impurities than traditional electrolytic method and smelting method. The high-dissolution-performance sulfur-carbonyl nickel pellets are prepared through chemical atomic vapor deposition reaction, and the S element in the sulfur-containing nickel metal is more uniformly distributed, so that the dissolution stability, plating solution stability and plating layer quality are better, thereby effectively reducing the local passivation of anode dissolution, plating solution composition fluctuation and plating layer performance difference caused by uneven S distribution.

The application provides a heterojunction-induced defect dual-phase heterostructure composite material and a preparation method and application in a battery thereof. The application prepares a heterojunction-induced defect dual-phase heterostructure NiS@ZnS / C nanosphere composite material through a simple two-step MOFs derivation method combined with a sulfuration and calcination process, wherein the dual-phase metal sulfides are NiS and ZnS respectively and are encapsulated in a carbon layer. The heterojunction interface between different crystals can induce an internal electric field to accelerate ion diffusion kinetics, improve the conductivity and provide abundant reaction sites for sodium energy storage. The application has high reversible capacity, high specific capacity, stable cycle performance and robust rate performance.

The application provides a method for preparing nickel sulfide and iron phosphate from a nickel-iron alloy and application thereof, and comprises the following steps: providing a nickel-iron alloy powder; adding a phosphoric acid solution to the nickel-iron alloy powder, performing a heating reaction, and obtaining a phosphoric acid leaching solution after filtration; adding ferrous sulfide to the phosphoric acid leaching solution, performing a precipitation reaction, and obtaining a nickel sulfide precipitate and an Fe 2+ containing filtrate after separation; adding an oxidizing agent to the Fe 2+ containing filtrate and adjusting the pH to be acidic, and the solid separated after the reaction is iron phosphate dihydrate. The method is simple, convenient to operate, has mild reaction conditions, high efficiency, does not need complex extraction equipment or impurity removal systems, and is easy to realize industrial application. The whole process has good closed-loop circulation, the main reagents, phosphate and ammonium, can be recycled, and conforms to the development concept of green metallurgy.

This invention provides a method for separating nickel and iron in nickel-containing ferric chloride and its application. The method includes: preparing a solution of nickel-containing ferric chloride obtained by chlorination and roasting of a nickel-iron alloy; performing solid-liquid separation via iron precipitation reaction to obtain ferric phosphate dihydrate and a nickel-containing filtrate; adjusting the pH of the nickel-containing filtrate to 5-6 and then performing solid-liquid separation to obtain a nickel solution; adding a sulfur source to the nickel solution, and then performing solid-liquid separation after reaction to obtain nickel sulfide. This invention, through stepwise precipitation and precise pH control, simultaneously achieves high-purity iron production and efficient nickel enrichment within an ammonia-based system. The process is simple, low-cost, and suitable for the preparation of battery-grade ferric phosphate and the recycling of nickel resources.

The application discloses a preparation method of nickel sulfide / cobalt sulfide for a nickel-zinc battery based on sulfur vacancy enrichment, and is specifically implemented according to the following steps: step 1, preparing Ni-doped Co5(O 9.48 H 8.52 )NO3 nanosheet material; step 2, preparing Ni3S2 / Co3S4 nanosheet heterojunction material; and step 3, preparing Ni3S2 / Co3S4 nanosheet heterojunction material with sulfur vacancy enrichment. The positive electrode material is green and environment-friendly, has high specific surface area and high electrical conductivity, and has high power density and area specific capacity compared with other positive electrode materials of an alkaline Ni-Zn battery.

This invention discloses a two-dimensional porous carbon material, its preparation method, and its application, belonging to the field of water electrolysis for hydrogen production technology. The preparation method of the two-dimensional porous carbon material is as follows: a polyacrylamide solution, a reducing agent, a sulfur-containing compound, and a metal salt are stirred to form a gel-like spatial network structure, followed by a microwave hydrothermal reaction to obtain a precursor; the precursor is dissolved in a water-soluble salt to obtain a mixed solution, which is then freeze-dried to obtain a mixture; the mixture is annealed, and after annealing, it is washed with water to obtain the two-dimensional porous carbon material. The two-dimensional porous carbon material prepared by this invention possesses excellent conductivity and a continuous electron transport path, providing a sufficient electrode / electrolyte interface for the electrocatalytic hydrogen evolution reaction and improving the electrocatalytic efficiency of sulfides.

A P-NiS@(Al, Ni)OOH / NF core-shell catalyst for electrocatalytic oxygen evolution and a preparation method and application thereof belong to the technical field of electrocatalysis. The P-NiS@(Al, Ni)OOH / NF core-shell catalyst is a foam nickel self-supporting catalyst, which comprises a foam nickel NF conductive matrix and a P-NiS@(Al, Ni)OOH core-shell structure grown in situ on the foam nickel NF conductive matrix. The P-NiS@(Al, Ni)OOH core-shell structure comprises a P-NiS nanorod core layer structure and a shell layer structure composed of AlOOH and amorphous NiOOH located on the outer layer of the core layer structure. The outer shell layer structure is rich in oxygen holes, aluminum metal holes and high-valence nickel species, and has excellent water electrolysis oxygen evolution performance. The prepared catalyst has abundant active sites, excellent water electrolysis oxygen evolution reaction performance, simple and environmentally friendly preparation process, and wide application prospect.

Methods of flash-within-flash (FWF) Joule heating and the systems thereof. The FWF Joule heating process subjects outer feedstock in an outer vessel to a flash Joule heating process, whereby the flash Joule heating process upon the outer feedstock results in the conversion of inner feedstock within an inner vessel (which inner vessel is within the outer vessel) to a converted material.

This application provides a nickel sulfide-carbon fiber electrode, its preparation method, a zinc-iron flow battery, and an electrical device thereof. The preparation method of the nickel sulfide-carbon fiber electrode includes the following steps: mixing urea solution with carbon fiber to obtain a mixture; mixing the mixture, nickel salt solution, and thioacetamide solution, reacting at 40℃~120℃, and drying to obtain an electrode preform; calcining the electrode preform under an inert atmosphere to obtain the nickel sulfide-carbon fiber electrode. The preparation method of the nickel sulfide-carbon fiber electrode of this application uses urea solution to impregnate carbon fiber, where nitrogen atoms can change the electronic structure of the carbon fiber surface, enhancing the electron transport capacity of the carbon fiber; simultaneously, the reaction of nickel salt and thioacetamide under specific temperature conditions to form nickel sulfide can improve the catalytic effect on the redox reaction on the positive electrode side of the battery.