74results about How to "Reduce hydrogen evolution overpotential" patented technology

The invention discloses a negative plate of a secondary nickel-iron battery, a preparation method of the negative plate and a secondary nickel-iron battery of using the negative plate and belongs to the technical field of negative electrode materials for secondary nickel-iron batteries. According to the main points of the technical scheme, a negative active material in the negative plate of the secondary nickel-iron battery comprises an additive zinc-based multilayered hydroxide [ZnxMyM'z(OH)2].[(A<a->)n.mH2O]. The invention further particularly discloses a preparation method of the negative plate of the secondary nickel-iron battery and the secondary nickel-iron battery of using the negative plate. By adopting the novel negative plate of the secondary nickel-iron battery, the energy density and the rate capability of the secondary nickel-iron battery can be greatly improved and the cycle life of the secondary nickel-iron battery can be greatly prolonged.

The invention provides a preparation method of a sponge-structured alloy ternary oxide layer-loaded hydrogen evolution electrode material. The preparation method specifically comprises the following preparation processes: a process of electrically depositing an organic solvent of a La-Y base layer of a sponge structure, a process of electrically depositing a Ni-Cu middle layer on the surface of the La-Y base layer, a process of electrically compositing and depositing Ni-Cu and RuO2 particles on the surface of the Ni-Cu middle layer, a process of performing atomic diffusion treatment, and a process of anodizing a sponge-structured Ni-Cu-La-Y alloy base body-loaded RuO2 layer. The novel hydrogen evolution electrode material prepared by the preparation method disclosed by the invention is high in chemical stability and electrocatalytic activity, has excellent low hydrogen evolution overpotential and high specific surface area, and can be applied to large-scale industrial production for preparing hydrogen by low-energy-consumption water electrolysis.

The invention discloses synthesis and application of a nano carbon fiber electrocatalyst containing cobalt-molybdenum oxide. The synthesis is characterized in that a cobalt nitride-phosphomolybdenum polyacid ion crystal compound is firstly synthesized, is mixed with polymer polyacrylonitrile for electrostatic spinning, and is roasted to synthesize nano carbon fibers containing cobalt-molybdenum oxide. As an electrocatalyst, the nano carbon fiber electrocatalyst containing cobalt-molybdenum oxide has very catalytic activity, has catalytic activity under different acid and alkaline conditions, and can be used in hydrogen evolution and oxygen evolution fuel cells.

The invention discloses a lead-carbon battery negative electrode additive and an electrode plate preparation method thereof. The additive is a Pb-C-SiO2 compound which is prepared with constant current electrodeposition; and an electrode plate is composed of lead powder, Pb-C-SiO2, humic acid, short fibers, barium sulfate, sodium lignosulphonate and acetylene black. Different from the traditionallead-carbon compound additive, for the lead-carbon battery negative electrode additive, on the past basis, silicon dioxide nanoparticles are added; and nanometer silicon dioxide can store an electrolyte, and the solution stored by the nanometer silicon dioxide can provide more sulfate ions for a carbon material with high reactive sites along with electrochemical circulation of a negative electrode, so that the conversion rate of lead sulfate is accelerated, and the adaptive capacity of the electrode at high current density is improved. The electrode plate which is composed by the compound provided by the invention, the effective utilization ratio of the active substances can be effectively increased, the negative electrode sulfation phenomenon under high-rate partial-state-of-charge is relieved, and the cycle life of the battery is prolonged.

The invention provides a Ni-Fe-Mo-Mn porous material. The Ni-Fe-Mo-Mn porous material is prepared by the steps of accurately weighing 15 to 21 percent of ferro-molybdenum, 11 to 16 percent of ferro-manganese, 7 to 9 percent of iron powder the balance of nickel, preparing pre-alloyed powder by adopting an atomization technology and sintering in vacuum. The porous material prepared by the inventionhas abundant, uniform and controllable pores and has the advantages of large specific surface area, low hydrogen evolution overpotential, good catalytic performance, good corrosion resistance, stableworking performance, simple and environment-friendly preparation technology and the like; the preparation cost is low and the technology is simple and easy to realize. The porous material prepared bythe invention can be used as the electrolytic hydrogen evolution cathode material.

The invention discloses a preparation method of a Ni-Fe-Mo-Cu porous material. The preparation method comprises the following steps: uniformly mixing powder with the granularity of 3 to 10mu m of fourtypes of high-purity elements including Ni, Fe, Mo and Cu according to the mass percent ratio of 15 to 35 percent of the Fe, 1 to 8 percent of the Mo, 1 to 7 percent of the Cu and the balance of theNi, and drying; then doping stearic acid and pressing and molding to obtain a green body; carrying out vacuum sintering on the green body by utilizing a solid-phase partial diffusion principle to prepare the Ni-Fe-Mo-Cu porous material. The porous material prepared by the preparation method has the advantages of abundant and uniformly-distributed pores, relatively high specific surface area and mechanical strength, relatively low hydrogen evolution overpotential and relatively good corrosion resistance property and chemical stability; a preparation technology is simple and environmentally friendly, has potential application value in the fields of electrolysis hydrogen evolution and industrial filtering and has great significance.

The invention discloses a nickel-based electrolysis hydrogen evolution porous cathode material and a preparation method thereof. The preparation method comprises the following steps that high-purity Ni powder, high-purity Fe powder, high-purity Mo powder and high-purity Mn powder are mixed uniformly, the mixture comprises, by mass, 10-15% of Fe, 10-15% of Mo, 5-15% of Mn and the balance Ni, and after the mixture is added with glue, dried and then pressed and formed into blanks, based on the principle of a solid-phase deviation diffusion, a vacuum sintering reaction is carried out on the blanksto synthesize a Ni-Fe-Mo-Mn porous material. According to the nickel-based electrolysis hydrogen evolution porous cathode material and the preparation method thereof, the nickel-based porous materialprepared is rich and uniform in pores, and has the advantages of being large in specific surface area, low in hydrogen evolution over potential, good in catalytic performance, excellent in corrosionresistance, stable in working performance, simple in the preparation process, environment-friendly and the like, the preparation cost of the material is low, the process is simple and easy to realize,and the porous material prepared through the method can be used as the electrolysis hydrogen evolution cathode material.

The invention discloses a cobalt phosphide graded porous nanowire material, preparation thereof and an application thereof in water electrolysis hydrogen production reaction. In the cobalt phosphide hierarchical porous nanowire material, a large number of pores are distributed in the cobalt phosphide nanowire to form a hierarchical porous structure. The preparation method comprises the following steps: firstly, synthesizing basic cobalt carbonate nanowires, then carrying out controllable phosphorization, and simultaneously carrying out phosphorization and pore formation. According to the invention, the hydrogen evolution overpotential of cobalt phosphide can be reduced, and the electrocatalytic activity and stability are improved. The cobalt phosphide hierarchical porous nanowire has important application value as an electrocatalytic material, and the method is simple, efficient and capable of being used on a large scale.

The invention discloses a preparation method of a composite electro-catalytic material for alkaline electro-catalytic hydrogen evolution. The method comprises the following steps: growing a layer of Ni(OH)2 nano sheet structure on carbon fiber paper; coating the surface of the Ni(OH)2 nano sheet structure with a titanium oxide layer by vacuum plating; performing annealing crystallization in a muffle furnace at a temperature of 360 DEG C in an air atmosphere to obtain a TiO2-Ni(OH)2@CFP composite structure material; and performing annealing crystallization on the TiO2-Ni(OH)2@CFP in an air atmosphere by controlling different coating times to obtain the composite electro-catalytic material after coating for different times. The method uses CFP as a base material of a catalyst, a surface areaof a composite electrode is increased, mass transfer is facilitated and the electrochemical activity of the electrode is improved. At the same time, Ni(OH)2 is grown on the base material by hydrothermal, the cost is reduced, combination of Ni(OH)2 and the base material is relatively firm, and distribution is uniform to improve stability of the catalyst. The introduction of TiO2 plays a great rolein improving catalytic performance of the catalyst and reducing hydrogen evolution overpotential, and significant improvement of the electro-catalytic hydrogen evolution activity is realized.

The invention discloses a preparation method and application of a multifunctional double-layer nanowire layered composite material, belongs to the technical field of chemical materials, and aims to provide a preparation method and application of the multifunctional double-layer nanowire layered composite material with low overpotential, high surface capacitance, good rate capability and good stability. The preparation method comprises putting foam nickel loaded with redox graphene into a mixed solution of cobalt nitrate and urea, carrying out heat preservation at 120 DEG C for 10 hours to react to form a CoO nanowire precursor, putting the precursor into a mixed solution containing cobalt nitrate, nickel nitrate, urea and ammonium fluoride, putting the mixed solution into a box-type furnace at 120-160 DEG C, keeping the temperature for 6 hours, taking out a sample to obtain a double-layer nanowire precursor, and carrying out annealing at 300-500 DEG C to obtain the multifunctional double-layer nanowire layered composite material. The material is rich and easily available in raw material reserves, low in price, excellent in performance, small in overpotential, large in surface capacitance, high in rate capability and relatively good in cycling stability.

The invention discloses a hydrogenated active cathode and a preparation method of the hydrogenated active cathode and an electrolytic tank with the hydrogenated active cathode. The hydrogenated activecathode comprises a conductive substrate and an active catalyst layer on the conductive substrate, and the active catalyst layer is directly formed on the surface of conductive substrate after heat treatment of nitric acid series nitrate. By means of the preparation method of the hydrogenated active cathode, the defect that the chlorine gas decomposed out in the process of heat treatment when utilizing a chloride solution as a coating solution has great harm to human body is overcome. The prepared catalyst layer of the hydrogenated active cathode is obtained by heat treatment of the nitric acid series nitrate solution with less corrosivity to a nickel base material in an oxygen atmosphere and the heat treatment of low-high-temperature two-stage burning is preferred, the preparation methodof the hydrogenated active cathode is simple, the prepared cathode is strong in corrosion resistance and is long in service life, low in electrode potential, excellent in catalytic activity and highin uniformity of the catalyst layer, and the electrolytic properties and electrocatalytic activity are both improved greatly.

The invention provides a Ni-S-W-C hydrogen evolution electrode comprising a nickel base body and a Ni-S-W-C coating layer deposited on the surface of the nickel base body. The Ni-S-W-C coating layer comprises, by weight, 50%-80% of Ni, 5%-20% of S, 0.1%-1.5% of W and the balance C. The W and C elements are added to a Ni-S coating layer to form the Ni-S-W-C coating layer. The Ni-S-W-C coating layer has low hydrogen evolution over potentiality, high hydrogen evolution catalytic activity and excellent stability and can be widely used as an alkaline water electrolysis hydrogen evolution electrode material. According to the embodiment, the Ni-S-W-C hydrogen evolution electrode provided by the invention has the hydrogen evolution over potentiality being 270mV, the apparent current density being 5.27x10<2> mA/cm<2>, and has higher hydrogen evolution catalytic activity.

The invention belongs to the field of electrochemical materials and discloses a porous amino-functionalized graphene catalytic material and preparation and an application. The preparation comprises the following steps: adding graphene oxide and an ammonia source into a solvent, stirring the two to be uniformly dissolved and carrying out hydro-thermal treatment, carrying out centrifugal washing andfreezing and drying on the product to obtain the amino-functionalized graphene; dispersing the amino-functionalized graphene in a strong base solution, heating and stirring the mixture for an erosionreaction, then transferring the mixture to a ball mill tank to be ball-milled and perforated, neutralizing the reaction liquid with acid, and separating, washing, freezing and drying the solid product to obtain the porous amino-functionalized graphene catalytic material. The preparation method provided by the invention is simple and is only carried out at 80 DEG C in an alkaline condition. The obtained catalytic material has very good electrochemical hydrogen evolution catalytic performance and relatively good stable performance and can promote development of scaled hydroelectrolytic catalytic materials.

The invention discloses a preparation method of a high-performance nickel-cobalt phosphide hydrogen evolution catalyst and an efficient water electrolysis hydrogen evolution research, and belongs to the technical field of water electrolysis hydrogen production and new energy. The preparation method is characterized by comprising the steps of: phosphorizing foam metal substrates such as foam cobalt and foam nickel through a chemical vapor deposition method to prepare a non-noble metal phosphide Co2P/Ni2P porous conductive skeleton; and soaking the conductive skeleton in a solution of cobalt, nickel and other metal salts, and drying and phosphorizing the conductive skeleton again to obtain the non-noble metal phosphide hydrogen evolution catalyst with a nano-porous structure which shows excellent catalytic hydrogen evolution activity and stability in neutral and alkaline environments. The unique structural design greatly exposes the active sites of the metal phosphide, reduces the contact resistance among the components of the material, contributes to hydrogen adsorption and release and accelerates charge transfer among different component interfaces, thereby greatly reducing the overpotential of hydrogen reaction and assisting the development of the hydrogen energy industry and hydrogen fuel cells in China.

The invention discloses a nickel-molybdenum-copper ternary metal phosphide as well as a preparation method and application thereof, and is applied to the technical field of water electrolysis hydrogen production. Metal Ni is adopted as a basis, Cu element and Mo element with good hydrogen evolution performance are selected to prepare the ternary composite metal material, and then the catalytic performance of the ternary composite metal material is further improved through phosphorization. Foamed nickel is used as a substrate, and the catalyst grows on the foamed nickel substrate in situ through a hydrothermal method, so that the catalyst has excellent conductivity. The prepared catalyst has excellent hydrogen evolution catalytic activity and stability. The raw materials are rich in reserves and low in price. Meanwhile, the synthetic method used in the invention is simple to operate and easy to control, and can realize large-scale production.

The intention relates to a Co@ FePx-NCs material for alkaline solution hydrogen evolution and a preparation method and application thereof. The method comprises the steps that firstly, ferric chloride, sodium hypophosphite, dicyandiamide and ethyl alcohol are mixed and prepared into a solution, then a cobalt source is added into the solution and mixed evenly, and a mixed solution is obtained; by heating and evaporating the mixed solution to dryness, a CoPx/FePx-C2N4H4 mixture is obtained, finally by soaking the CoPx/FePx-C2N4H4 mixture in a phosphoric acid solution for etching, and sequentially filtering, drying and calcining, the Co@ FePx-NCs hydrogen evolution material is obtained. The Co@ FePx-NCs material can be used for electrocatalytic hydrogen evolution reaction. Compared with the prior art, the preparation method is simple, the raw material cost is low, the earth reserve of main elements is sufficient, the electrochemical performance of the electrode material is improved through the composite effect of two transition metals, and the Co@ FePx-NCs material has a wide industrial application prospect.

The invention discloses a manufacturing method of an Ni-Cr-Al-Cu porous material. The manufacturing method comprises the steps that a powder reaction synthesis method is adopted, and high-purity Ni powder, high-purity Cr powder, high-purity Al powder and high-purity Cu powder are prepared in a certain ratio, wherein the total content of the Cr powder, the Al powder and the Cu powder is 22wt%-45wt%of the total content; after the prepared powder is uniformly mixed and dried, stearic acid is added, and drying is conducted again; pressure forming is conducted, so that a green blank is obtained; and vacuum sintering is conducted on the green blank by the use of the solid phase partial diffusion principle, so that the Ni-Cr-Al-Cu porous material is manufactured. The porous material manufacturedaccording to the manufacturing method has the low hydrogen evolution overpotential, the large specific surface area, excellent corrosion resistance, good catalytic performance and stable working performance, and a manufacturing technology of the porous material is simple and environmentally friendly, has the potential application value in the fields of hydrogen electrolysis evolution and industrial filtering, and has an important significance.

The invention discloses a carbon quantum dot-doped foamed nickel-molybdenum alloy and a preparation method thereof. The method comprises the following steps: (1) preparing a part of electroplate liquid for electrodeposition of the foamed nickel-molybdenum alloy according to a known formula; (2) preparing a glucose carbon quantum dot solution by adopting a glucose hydrothermal method; (3) freezing and drying glucose carbon quantum dots into a carbon quantum dot solid, grinding the carbon quantum dot solid into carbon quantum dot powder, and adding the carbon quantum dot powder into the solution obtained in the step (1) to obtain an electro-deposition solution; (4) using nickel and molybdenum as anodes, foamed nickel as a cathode, placing the anodes and the cathodes in the electro-deposition solution, and performing electro-deposition in a single-cathode and double-anode mode; and (5) heating the solution to 35-55 DEG C, and carrying out electro-deposition under the condition that the apparent cathode current density is 110-130 mA/cm<2>. The foamed nickel-molybdenum alloy doped with the carbon quantum dots prepared by the method has the beneficial effects of good plating quality, good hydrogen evolution effect, high stability and high molybdenum content.