87results about How to "Improve oxygen evolution performance" patented technology

The invention relates to a cobalt manganese sulfide electrocatalyst and a preparation method thereof. The preparation method comprises the following steps that 1, cobalt salt, manganese salt and ureaare weighed, the weighed cobalt salt, manganese salt and urea are dissolved in water, stirring is conducted, and evenly mixed solution is obtained; 2, the solution and carrier are placed into a reactor together to undergo a hydrothermal reaction, and supported cobalt manganese carbonate is obtained; 3, the supported cobalt manganese carbonate is put into aqueous solution containing vulcanizing agent to undergo a vulcanization reaction, and supported cobalt manganese sulfide is obtained. The cobalt manganese sulfide electrocatalyst and the preparation method have the following advantages that the adopted raw materials are cheap and easy to obtain, the preparation method is simple, operation is easy and convenient, and the cost is low; the manganese element is introduced into cobalt, binarycobalt manganese sulfide is prepared, meanwhile carbon paper, carbon cloth, foam nickel, foam copper, titanium mesh or stainless steel mesh are combined and used as substrate, the two-in-one structureof catalyst and electrode is directly formed, testing is convenient, and the catalyst is endowed with excellent electrochemical catalysis hydrogen evolution or oxygen evolution performance by means of the synergistic effect of cobalt manganese sulfide and the substrate.

The invention relates to a foam nickel@cobalt molybdenum phosphide/nickel iron double hydroxide electrode, a preparation method and application thereof. Firstly, a three-dimensional porous coral skeleton-shaped cobalt molybdenum phosphide is formed on foam nickel, and then on the basis of the product, a vertically arranged nickel iron double hydroxide nanosheet array is prepared by electrodeposition process. The preparation method includes the steps of: first, placing foam nickel in a precursor solution of a cobalt salt and molybdate for hydrothermal reaction, under the coexistence of an inertgas and phosphate, conducting phosphatization treatment, and finally performing electrodeposition in an aqueous solution of a nickel salt and a ferrous salt, thus obtaining the foam nickel@cobalt molybdenum phosphide/nickel iron double hydroxide electrode material. The foam nickel@cobalt molybdenum phosphide/nickel iron double hydroxide electrode provided by the invention adopts a non-noble metalsalt precursor and hydrosolvent, is low in price and simple in preparation, has hydrogen evolution, oxygen evolution and full hydrolysis performance, and also has good stability.

The invention relates to a cobalt disulfide/carbon-nitrogen composite material for water electrolysis oxygen evolution, and a synthesis method thereof. The material is a porous dodecahedral structure,and CoS2 nanoparticles are coated with graphite carbon and are uniformly distributed on a dodecahedral carbon-nitrogen framework. The material has excellent activity and ultra-long-time stability inwater electrolysis oxygen evolution a water electrolysis anodic oxygen evolution catalyst, has excellent performances, has a far better catalysis effect than noble metals Ru and Ir, has far better performances than non-noble metal material catalysts obtained by other methods, and has a great application prospect in the field of water electrolysis oxygen evolution.

A preparing method of N,S-codoped graphene/MoSe2/CoFe-LDH aerogel is provided. The method is characterized by including S1) separately preparing a graphene oxide sheet dispersion, a MoSe2 nanosheet dispersion and a layered CoFe-LDH nanosheet dispersion; S2) mixing the graphene oxide sheet dispersion and the MoSe2 nanosheet dispersion, adding a reductant and a crosslinking agent, fully mixing the mixture, reacting the mixture to obtain N,S-codoped graphene/MoSe2 hydrogel, freeze-drying the hydrogel to obtain N,S-codoped graphene/MoSe2 aerogel; and S3) soaking the N,S-codoped graphene/MoSe2 aerogel in the layered CoFe-LDH nanosheet dispersion to obtain N,S-codoped graphene/MoSe2/CoFe-LDH hydrogel, and freeze-drying the hydrogel to obtain the N,S-codoped graphene/MoSe2/CoFe-LDH aerogel. The prepared ternary N,S-codoped graphene/MoSe2/CoFe-LDH aerogel has more excellent hydrogen evolution and oxygen evolution properties under alkaline conditions.

The invention provides a carbon material with a nitrogen, fluorine and transition metal co-doped graphene structure. Melamine, polytetrafluoroethylene and a metal salt are taken as raw materials for mixing and uniform grinding to prepare and obtain a nitrogen, fluorine and transition metal co-doped carbon material by employing a one-step carbonization method. The carbon material shows a graphene or graphene-like structure; the nitrogen, fluorine and metal elements are uniformly distributed, and the carbon material has excellent oxygen reduction and oxygen evolution performances. The one-step carbonization preparation method comprises the following steps of: 1) mixing of the raw materials; and 2) one-step carbonization method. The carbon material provided by the invention has excellent oxygen reduction and oxygen evolution performances. Besides, the excellent oxygen reduction and oxygen evolution performances of the material can be improved through regulation of the synergistic effect among the nitrogen, the fluorine and transition metal. The one-step carbonization method is good in repeatability, simple in process and easy to operate. The carbon material has wide application prospects in the fuel cell and metal-air cell electrode catalysis and the direction of functional carbon materials.

The invention relates to a preparation method of a double-effect oxygen electrode catalyst, in particular to the preparation method of a regenerable fueling battery oxygen electrode catalyst taking Pt as a basis. The method comprises the following steps: directly mixing a certain amount of H2IrCI6 and H2 PtCl6 into an organic solvent; adjusting the proportion of the H2IrCI6 and the H2 PtCl6; dripping the mixture onto a conductive matrix; and preparing an IrO2 Pt efficient catalyst through the thermal decomposition method, thereby not only the oxygen-evolution catalytic activity of the catalyst can be greatly improved, the electric potential can be reduced, and the availability of the catalyst is improved, but also the preparation process is simple, and no impurity enters; the prepared product can also be used for cathodic and anodic catalysts for other fuel batteries and other fields such as gas reforming, organic matter schizolysis, pollutant treatment, seawater electrolysis, and the like.

The invention belongs to the technical field of electrocatalysis, and specifically relates to a preparation method of a non-noble metal NiCoFe/NF electrocatalyst and application of the electrocatalyst to oxygen evolution. The catalyst is mainly prepared by a hydrothermal reaction and a metal cation exchange reaction at room temperature in two steps, wherein in the first step, Ni-doped Co-MOF is grown on foam nickle in situ as a precursor for the next step of reaction; in the second step, obtained NiCo/NFis immersed in an aqueous solution containing ferrous sulfate, and after drying, the NiCoFe/NF catalyst is obtained. The catalyst obtained by the method can achieve the electric current density of 10 mA/cm<2> with only 252 mV of overpotential, has excellent long-term stability at the same time, and has higher oxygen evolution activity compared with other traditional non-noble metal catalysts. The preparation method involved in the invention is simple; raw materials are abundant and easy to get; large-scale production potential is realized.

The invention relates to a preparation method and application of nickel sulfide/nickel phosphide formed by epitaxial growth of a one-dimensional nano-wire on a one-dimensional nano-rod. The preparation method comprises the following steps: preparing a nickel sulfide (Ni3S2) nano-rod through a hydrothermal method; then putting the Ni3S2 nano-rod into a tubular furnace and calcining under a PH3 atmosphere; while PH3 gas with strong reducibility is used for displacing S, promoting the epitaxial growth of the nano-wire on the nano-rod; finally, obtaining a one-dimensional/one-dimensional structureassembled Ni3S2-Ni12P5 material. The material plays an important role on electro-catalytic water decomposition anode oxygen evolution reaction. The one-dimensional/one-dimensional nickel sulfide/nickel phosphide material can be used as a working electrode of electro-catalytic oxygen evolution reaction; meanwhile, the one-dimensional/one-dimensional nickel sulfide/nickel phosphide material also can be used for fields including a water electrolysis technology, solar water electrolysis for producing oxygen, carbon dioxide reduction and the like.

The invention relates to a preparation method for a carbon/metal oxide nanofiber composite catalyst. The preparation method comprises the following steps of (a), dissolving a metal ion-containing salt solution and a high-molecular polymer into an organic solvent, and stirring to form a spinning precursor mixed solution, wherein the metal ion concentration is weighed based on a stoichiometric ratio; (b), performing electrostatic spinning on the spinning precursor mixed solution to form a composite non-woven material; and (c), putting the composite non-woven material into an inert atmosphere to be subjected to high-temperature calcining to obtain the carbon/metal oxide nanofiber composite catalyst. The carbon/metal oxide nanofiber composite catalyst has high electrical conductivity, reinforced oxygen reduction electro-catalytic property and excellent oxygen evolution performance, and is a dual-functional catalyst with efficient catalytic property.

The invention provides a high-efficiency bifunctional water decomposition electrocatalyst and a preparation method thereof, and relates to the technical field of electrocatalytic water decomposition.The preparation method comprises the following steps: mixing cobalt acetate, ammonium fluoride, urea and a solvent to obtain a mixed solution; immersing carbon cloth into the mixed solution for hydrothermal reaction to obtain carbon cloth with a cobalt nanorod precursor growing on the surface; and then carrying out electrochemical conversion on the carbon cloth with the cobalt nanorod precursor growing on the surface to obtain the efficient bifunctional water decomposition electrocatalyst. A three-electrode system is adopted in electrochemical conversion, carbon cloth with a cobalt nanorod precursor growing on the surface serves as a working electrode, a saturated calomel electrode serves as a reference electrode, and a mixed solution of selenium dioxide, potassium chloride and water serves as an electrolyte. The electrocatalyst prepared by the invention has high hydrogen evolution activity, high oxygen evolution activity and good stability, can efficiently realize full water decomposition, and promotes the electrocatalytic water decomposition to develop towards the practical direction of higher current density and lower external potential.

The invention belongs to the technical field of manufacturing of electro-catalysis materials and provides a stainless steel base water electrolysis catalytic electrode and a manufacturing method of the stainless steel base water electrolysis catalytic electrode. According to the stainless steel base water electrolysis catalytic electrode, a three-dimensional micron protrusion array is distributedon a stainless steel matrix. Micro-spheres of different sizes are distributed on the surface of the protrusion array at random. The surfaces of the micro-spheres are covered with oxide nanometer flossy structures formed by disordered stacking of nanometer particles. The manufacturing method of the stainless steel base water electrolysis catalytic electrode comprises the steps that firstly, high-energy-density pulse laser is utilized to conduct ablation on the surface of the stainless steel matrix so that the micron protrusion array can be formed; then, nanosecond pulse laser is utilized to conduct ablation on the surface of the protrusion array so that the micro-spheres and the nanometer flossy structures can be formed, and then the self-supporting electrolytic electrode without the need for an adhesion agent is obtained. The stainless steel base water electrolysis catalytic electrode has excellent water electrolysis hydrogen and oxygen evolution performance, overall water splitting performance and high stability; the manufacturing method is simple and controllable, large-area manufacturing can be achieved, raw materials are low in cost and easy to obtain, and the stainless steel base water electrolysis catalytic electrode can be used for wide application fields such as the field of hydrogen for fuel cell cars, the field of underwater equipment oxygen generation, the field of medical oxygen generation, the field of hydrogen water cups, the field of highland oxygen generation and the field of portable hydrogen and oxygen generating devices.

The invention provides a NiS/NiO heterojunction-loaded nitrogen-doped carbon nano composite material and a preparation method and application thereof. The preparation method comprises the following steps: S1, preparing Ni < 2 + >/PVP mixed sol; S2, performing electrostatic spinning on the Ni < 2 + >/PVP mixed sol to obtain a solid carbon fiber film; and S3, pre-oxidizing the solid carbon fiber film in an air atmosphere, and sequentially carrying out heat treatment in an inert atmosphere, oxidation treatment in the air atmosphere and sulfuration vapor deposition to obtain the NiS/NiO heterojunction-loaded nitrogen-doped carbon nano composite material. PVP selected in the method is cheap and easy to obtain, and compared with a traditional method for preparing the water electrolysis oxygen evolution electrocatalyst material, the method is simple and feasible in process, low in cost and easy to operate, and large-scale production can be achieved.

The invention discloses a ferro-nickel phosphate/carbon nanotube composite material and a preparation method and application thereof. A structure unit of the ferro-nickel phosphate/carbon nanotube composite material takes porous three-dimensional carbon nanotubes as a net-shaped framework, and ferro-nickel phosphate nanoparticles are wound on the carbon nanotubes. The preparation method comprisesthe following steps: pretreatment of the carbon nanotubes, preparation of a ferro-nickel hydroxide/carbon nanotube precursor, and in-situ conversion reaction of the ferro-nickel phosphate/carbon nanotube composite material. By the prepared ferro-nickel phosphate/carbon nanotube composite material, the problem that in a traditional preparation technological process, ferro-nickel phosphate nanoparticle unit structures are severely agglomerated can be solved effectively, and a new method is provided for preparing an electrode material which has a completely exposed active site, and is high in catalytic activity, good in electrical conductivity, low in overpotential and high in stability.

The present invention discloses a cobalt iron oxide hollow nano-cage material, which has an inner cavity and an outer shell. The invention further discloses a preparation method of the cobalt iron oxide hollow nano-cage material, and uses of the cobalt iron oxide hollow nano-cage material in oxygen evolution electrode materials. According to the present invention, the cobalt iron oxide hollow nano-cage material has good performance superior to the commercial noble metal RuO2 material.

The invention discloses a molybdenum carbide/foamed nickel composite material, a preparation method, and application thereof in electrocatalytic oxygen evolution. The molybdenum carbide/foamed nickelcomposite material comprises molybdenum carbide and foamed nickel, and the molybdenum carbide is loaded on the foamed nickel. The preparation method of the molybdenum carbide/foamed nickel composite material comprises the following steps: preparing a molybdenum carbide precursor solution, covering the foamed nickel with a molybdenum carbide precursor, and calcining to obtain the molybdenum carbide/foamed nickel composite material. The molybdenum carbide/foamed nickel composite material has the advantages of large specific surface area, stable structure, good electrocatalytic performance and the like, is a novel electrocatalyst which is good in oxygen evolution effect, stable in performance and capable of being widely applied to electrocatalytic oxygen evolution, can be directly used as anelectrode material for electrocatalytic oxygen evolution reaction, and has very high use value and very good application prospect. The preparation method of the molybdenum carbide/foamed nickel composite material has the advantages of controllable preparation process, simple preparation process, low preparation cost and the like, is suitable for large-scale preparation, and is beneficial to industrial application.

The invention discloses an energy-saving production process of tetrapropylammonium hydroxide and a tetrapropylammonium hydroxide aqueous solution prepared by the energy-saving production process, and relates to the technical field of organic alkali production. According to the energy-saving production process, an electrolytic bath is used for production through an electrolytic method, and the electrolytic bath is provided with an anode plate and a cathode plate; and the process comprises the following steps: taking tetrapropylammonium bromide, adding water to prepare a tetrapropylammonium bromide aqueous solution, electrolyzing, combining tetrapropylammonium cations with hydroxyl ions generated in a cathode chamber to form tetrapropylammonium hydroxide, and preparing the tetrapropylammonium hydroxide aqueous solution; wherein the anode plate comprises a titanium substrate and a catalytic coating coated on the titanium substrate, and the catalytic coating is mainly prepared from the following coating raw materials in parts by weight: 15-25 parts of chloroiridic acid, 40-50 parts of nano tin dioxide, 0.8-1.2 parts of a nano titanium silicalite molecular sieve and 150-200 parts of n-butyl alcohol. The energy-saving production process has the advantage of low energy consumption.

The invention discloses a preparation method of a titanium-based composite anode and belongs to the field of heavy metal wastewater treatment. The prepared anode consists of a titanium matrix, a silicon dioxide middle layer and an iridium cerium niobium ternary active oxide coating. Compared with a conventional IrO2 anode, the addition of the SiO2 middle layer increases the active surface area ofanodic oxygen evolution reaction. The addition of Nb2O5 refines the surface grains of the oxide coating, makes the coating more compact and improves the stability of the anode. CeO2 plays the effect of a pore-forming agent. The addition of CeO2 makes the oxide dispersed in the coating more uniformly and improves the anodic electrocatalytic activity. The anode prepared has good oxygen evolution performance and long service life and is a good choice of an anode material for heavy metal wastewater treatment.