32results about How to "Improve hydrogen evolution catalytic activity" patented technology

The invention relates to a super-wetting dual-function electrolytic water electrode and its preparation method and application. The super-wetting dual-functional electrolytic water electrode of the present invention is formed by foaming nickel with cobalt acetate tetrahydrate and sodium sulfide nonahydrate. The surface reaction generates a dense nanosheet array structure. The electrode prepared by the method of the present invention has superhydrophilicity and supergas repellency, so that the electrolytic water reaction on the surface of the electrode continues to occur, which is beneficial to the mass transfer of reactants and the rapid diffusion of gas in the process of catalyzing hydrogen evolution, and finally makes The electrode exhibits excellent dual-functional water electrolysis performance, which significantly improves the efficiency of catalytic hydrogen evolution and reduces the cost of catalysis, which is of great significance to promote the development of hydrogen evolution technology and further use of clean energy.

The invention discloses a Ni-Cu-Ti / CNTs porous composite material and a preparation method thereof. In the present invention, Ni, Cu, Ti element powders and dispersed CNTs are mixed uniformly, then ball-milled, cold-pressed to form green bodies, and then sintered to prepare porous composite materials. The porous composite material has abundant pores and uniform distribution, a simple and environmentally friendly preparation process, excellent hydrogen evolution catalytic activity and mechanical properties, and can be used for electrolytic hydrogen desorption and industrial filtration in an alkaline environment.

The invention discloses a cuprous ion cluster compound hydrogen evolution electrode. Raw materials of the electrode comprise a cuprous ion cluster compound, a carbon elementary substance and paraffin. The mass ratio of the cuprous ion cluster compound to the carbon elementary substance is 1:1-5. The ratio of the total mass of the cuprous ion cluster compound and the carbon elementary substance to the mass of the paraffin is 1-5:1. The invention discloses a preparation method of the cuprous ion cluster compound hydrogen evolution electrode. The invention discloses application of the cuprous ion cluster compound hydrogen evolution electrode. Compared with the prior art, the cuprous ion cluster compound is introduced in the paraffin carbon paste carbon, and the electrode has higher hydrogen evolution catalytic activity. The hydrogen evolution electrode is easy to manufacture, good in stability, convenient to operate and low in cost.

The invention discloses a preparation method and application of an MoS2 / transition metal / graphene composite hydrogen dissociation electrode in a microbial electrolytic tank. The preparation method comprises the following steps: (1) dissolving graphene oxide with deionized water, performing ultrasonic peeling to obtain a graphene oxide solution, then, adding ammonium tetrathiomolybdate, a salt compound of transition metal and a reducing agent in sequence, and dispersing uniformly to obtain a mixed solution; (2) transferring the mixed solution into a reaction kettle, preserving heat for 10 to 12hours at 170 to 200 DEG C, and centrifuging, washing and drying a product to obtain the MoS2 / transition metal / graphene composite hydrogen dissociation catalyst; (3) uniformly loading an electrode material with the MoS2 / transition metal / graphene composite hydrogen dissociation catalyst to obtain the hydrogen dissociation electrode. According to the preparation method and the application of the MoS2 / transition metal / graphene composite hydrogen dissociation electrode in the microbial electrolytic tank, a reaction system is uniform; the production cost is low; the MoS2 / transition metal / graphene composite hydrogen dissociation electrode has good electrochemical performance, has a good catalytic hydrogen production effect, and can achieve double effects of treating pollution and producing energy.

The invention discloses a preparation method of a Ni-Fe-Mo-Cu porous material. In the present invention, four high-purity element powders of Ni, Fe, Mo, and Cu with a particle size of 3-10 μm are used as the ratio of 15-35% Fe, 1-8% Mo, 1-7% Cu, and Ni as the balance by mass percentage. After uniform mixing and drying, the mixed stearic acid is pressed to obtain a green body, and the green body is vacuum sintered to prepare a Ni-Fe-Mo-Cu porous material by using the principle of solid phase partial diffusion. The porous material prepared by the present invention has abundant and evenly distributed pores, has high specific surface area and mechanical strength, low hydrogen evolution overpotential, relatively excellent corrosion resistance and chemical stability, and its preparation process is simple and environmentally friendly. The field of hydrogen and industrial filtration has potential application value and is of great significance.

A method for preparing CNTs-porous nickel / nickel oxide hydrogen evolution reaction catalyst on the surface of iron and steel, the invention relates to a preparation method used as a catalyst for electrolysis hydrogen evolution reaction in alkaline solution. The invention aims to solve the problem of poor performance of non-noble metal hydrogen evolution reaction catalysts in alkaline solution at present. The method for preparing CNTs-porous nickel / nickel oxide hydrogen evolution reaction catalyst on steel surface: (1) preparation of nickel-copper alloy-CNTs composite electroplating solution; (2) preparation of copper leaching solution; (3) steel pretreatment; (4) in Prepare CNTs-nickel-copper alloy on steel surface; (5) prepare CNTs-porous nickel on steel surface; (6) prepare CNTs-porous nickel / nickel oxide on steel surface, and prepare CNTs with good hydrogen evolution reaction catalytic activity on steel surface The porous nickel / nickel oxide composite catalytic layer is beneficial to the improvement of the performance of the non-precious metal catalyst for the electrolysis hydrogen reaction.

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 high-efficiency Ni-S-B hydrogen evolution electrode, comprising a nickel base and a Ni-S-B coating deposited on the surface of the nickel base, and the Ni-S-B coating includes the following weight percentages: Components: Ni: 40-85%, S: 5-50%, B: 0.1-10%. The invention also discloses its preparation method and application. The invention improves the hydrogen evolution catalytic activity of the hydrogen evolution electrode and reduces the hydrogen evolution overpotential of the hydrogen evolution electrode.

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 provides a one-dimensional molybdenum phosphide nanorod and its preparation method and application. The preparation method comprises the following steps: uniformly dispersing molybdenum trioxide powder and adenine in deionized water to obtain a dispersion liquid, and carrying out the obtained dispersion liquid Hydrothermal reaction, after the reaction is completed, naturally cool to room temperature, centrifuge, wash, and dry to obtain a molybdenum trioxide-adenine ribbon precursor; combine the gained molybdenum trioxide-adenine ribbon precursor with sodium dihydrogen hypophosphite Perform phosphating reaction, cool to room temperature naturally, and obtain one-dimensional molybdenum phosphide nanorods. The invention obtains molybdenum phosphide nanorods composed of uniform nitrogen-doped nanoparticles, and has different crystal planes to provide a large number of surface active sites, thereby significantly improving the catalytic activity of the molybdenum phosphide. The preparation method of the invention is low in cost, easy to operate, green and non-polluting and non-toxic in raw materials, safe and simple in production process, suitable for industrial production, and has potential application value in the field of molybdenum phosphide and transition metal phosphide.

The invention discloses an N-doped porous carbon-coated MoP nanorod material, a preparation method and application thereof. The preparation method of the N-doped porous carbon coated MoP nanorod material includes: 1) MoO 3 The nanorods, surfactant, zinc source, and dimethylimidazole are contacted in a solvent to obtain a precursor powder; 2) the precursor powder is calcined and carbonized under a protective gas, and then the calcined and carbonized product is subjected to phosphating treatment to MoP nanorods coated with N-doped porous carbon were obtained. The N-doped porous carbon-coated MoP nanorod material has excellent catalytic activity, which enables it to be applied in HER electrocatalysis, and the preparation method has the advantages of simple operation, uniform and controllable morphology.

The invention provides a preparation method for molybdenum disulfide / graphitized carbon composite material, a catalyst and a preparation method thereof. The preparation method for molybdenum disulfide / graphitized carbon composite material comprises the following steps: performing a hydrothermal synthesis reaction on a sulfur-containing reducing agent, molybdate and ascorbic acid; sintering a product of the hydrothermal synthesis reaction to obtain the molybdenum disulfide / graphitized carbon composite material. The catalyst is prepared from the molybdenum disulfide / graphitized carbon compositematerial, the molybdenum disulfide / graphitized carbon composite material is prepared from molybdenum disulfide being of a layer structure and graphitized carbon inserted into adjacent layers of the layer structure. According to the preparation method for the catalyst applied to electrochemical hydrogen evolution, the prepared molybdenum disulfide / carbon composite material, is taken as the catalyst. The preparation method has the advantages of readily-available raw material, simple synthesis process, capability of preparing the molybdenum disulfide / carbon composite material which has high conductivity and catalytic property.