10results about How to "Reduce hydrogen evolution overpotential" patented technology

The invention discloses a zinc negative electrode protective layer material of an aqueous zinc ion battery as well as a preparation method and application of the zinc negative electrode protective layer material. The method comprises the following steps: dispersing a carbon material in an acidic liquid, stirring at room temperature, and fully mixing to obtain a uniform suspension; adding manganese salt into the mixed solution, stirring at room temperature, and then performing constant-temperature water bath; washing, centrifuging, drying and calcining a product obtained by the reaction to obtain expanded graphite; uniformly dispersing expanded graphite in a solvent, and stirring to obtain a dispersion liquid; adding a titanium-containing organic compound into the dispersion liquid and stirring; adding deionized water into the dispersion liquid and refluxing; and centrifuging, washing, drying and calcining to obtain the protective layer. According to the composite material, expanded graphite is prepared firstly, and then titanium dioxide quantum dots are anchored on the expanded graphite. Due to excellent zinc ion rate, compared with the prior art, the material has lower interface resistance and good cycling stability and rate capability, and the problems of interface dendritic crystal growth and the like are solved.

The invention provides a hydrogen production electrode doped with platinum, ruthenium, tin and praseodymium, a preparation method of the hydrogen production electrode and a water electrolysis hydrogen production device, and relates to the field of water electrolysis hydrogen production. The preparation method of the hydrogen production electrode doped with platinum, ruthenium, tin and praseodymium comprises the following steps: coating the surface of a conductive substrate with mixed powder; the conductive base material coated with the mixed powder is subjected to thermal oxidation treatment, the mixed powder comprises first metal powder, second metal powder and a pore forming agent, the first metal powder comprises Ni powder, and the second metal powder comprises Pt powder, Ru powder, Sn powder and Pr powder; and putting the structure subjected to thermal oxidation treatment into an alkaline solution, and activating to obtain the hydrogen production electrode doped with platinum, ruthenium, tin and praseodymium. The platinum, the ruthenium, the tin and the praseodymium are introduced into the hydrogen production electrode, so that the hydrogen evolution overpotential can be reduced. The hydrogen production electrode prepared by the method disclosed by the invention has relatively high catalytic activity, relatively high stability and a uniformly distributed porous structure, the electrolytic efficiency can be remarkably improved, and the service life of equipment is prolonged.

The invention provides a spraying-free Raney nickel electrode preparation method, a Raney nickel electrode and hydrolysis hydrogen production equipment, and relates to the field of Raney nickel electrodes. The preparation method comprises the following steps: mixing raw materials including aluminum powder, a dispersing agent, a binder and water to obtain raney nickel electrode slurry; coating the Raney nickel electrode slurry on a nickel net and drying to obtain a pretreated electrode; calcining the pretreated electrode net under inert gas protection or a vacuum condition to obtain an unactivated nickel-aluminum alloy net; and activating the unactivated nickel-aluminum alloy net to obtain the Raney nickel electrode. According to the preparation method provided by the invention, the precursor of the Raney nickel electrode is prepared in a slurry brushing manner, so that the consumption of powder is greatly reduced, and waste is reduced. A nickel-aluminum alloy phase is grown on the nickel net in situ in a powder metallurgy mode, and the nickel-aluminum alloy has very excellent binding force.

The utility model relates to a nickel net which is characterized in that the nickel net is a multi-strand stranded wire nickel net and comprises transverse stranded wires and longitudinal stranded wires, the transverse stranded wires and the longitudinal stranded wires are woven in a transverse and longitudinal staggered mode to form the nickel net, the transverse stranded wires are formed by stranding a plurality of strands of first nickel monofilaments, and the longitudinal stranded wires are formed by stranding a plurality of strands of second nickel monofilaments. Compared with a traditional nickel net weaving mode, the nickel net and the production process thereof have the advantages that the multi-strand stranded wire nickel net has higher surface area and surface roughness, and has better surface adhesion effect and fewer surface adhesion defects after spraying treatment, so that the catalytic activity of the surface of an electrode is improved, the hydrogen evolution overpotential is reduced, and the service life of the electrode is prolonged. The water electrolysis hydrogen production efficiency is improved.

The application discloses an MOF-derived nitrogen cobalt hetero-nano box electrocatalyst, a preparation method and application, and the method steps for preparing the catalyst are as follows: S1: preparation of a ZIF-67 template; S2: dissolving the ZIF-67 template in S1 in anhydrous methanol, ultrasonic stirring and dissolving, and recording as solution A; S3: dissolving 1H-1,2,3-triazole in an anhydrous methanol solution and recording as solution B; S4: adding the solution B in S3 into the solution A in S2, stirring, and then standing to perform a substitution reaction; and S5: centrifuging, drying and carbonizing the product after the reaction in S4 under nitrogen protection to obtain the MOF-derived nitrogen cobalt hetero-nano box electrocatalyst. The 2-methyl imidazole in the imidazole zeolite framework ZIF-67 is partially substituted by a high-energy nitrogen-containing ligand 1H-1,2,3-triazole ligand, a rich nitrogen source is provided, and the coordination environment of cobalt atoms is locally constrained, so that the prepared electrocatalyst has a lower hydrogen evolution overpotential under the alkaline condition of 1 mol / L KOH aqueous solution.

The application relates to the technical field of water electrolysis cathode preparation, in particular to an alkaline water electrolysis hydrogen production cathode and a preparation method and application thereof. The preparation method comprises the following steps: mixing nickel powder, aluminum powder, platinum group metal powder and graphene powder to obtain mixed metal powder; adopting plasma spraying to spray the mixed metal powder to the surface of an electrode base material to form a coating, thereby obtaining a hydrogen evolution electrode; adopting alkaline solution to activate the hydrogen evolution electrode to form a catalytic layer on the surface of the electrode base material, thereby obtaining an alkaline water electrolysis hydrogen production cathode. The platinum group metal and the graphene are collectively melted with the nickel and the aluminum at high temperature, and then are sprayed to the surface of the electrode base material by the plasma spraying mode to form the coating, so that the coating and the base body have better combination, the coating is more uniform, the service life of the electrode is improved, and the hydrogen evolution potential is lower.

The present invention discloses an alkaline secondary battery zinc negative electrode material and a preparation method and application thereof, belonging to the technical field of alkaline secondary batteries. The technical scheme of the present invention is as follows: the alkaline secondary battery zinc negative electrode material is mainly composed of a ZnO / ZnS / C composite material or a metal-doped ZnO / ZnS / C composite material. The present invention also specifically discloses a preparation method of the zinc negative electrode material for an alkaline secondary battery and an alkaline secondary battery using the negative electrode material. The novel alkaline secondary battery negative electrode material of the present invention can reduce the deformation of the zinc electrode, inhibit the growth, hydrogen evolution, and passivation of zinc dendrites, improve the stability of the zinc negative electrode in alkaline solution, and greatly improve the cycle life of the alkaline secondary battery.

The invention discloses a preparation method for quickly preparing an efficient hydrogen evolution catalyst on carbon steel. The method is prepared by treating empty carbon steel, preparing an electroplating solution and an electrodeposited catalyst. The preparation method is simple, the process is easy to control, the raw material source is wide, the cost is low, and the preparation cycle is short. In the preparation process, a dynamic hydrogen bubble template method is used to quickly and firmly grow a NiCoFe catalyst on a carbon steel substrate under a large current, which not only enhances the hydrophilicity and gas repellency of the carbon steel, but also improves the double electric layer capacitance of the material, reduces the hydrogen evolution overpotential of the material, and the prepared catalyst particle size is 1 μm, and the morphology is a three-dimensional porous spherical structure, which lays a foundation for its excellent hydrogen evolution catalytic performance. The catalyst prepared by the invention can be mass-produced, has good economic benefits, and is suitable for industrial application.

The application relates to the field of electrocatalysis, and particularly relates to a high-catalytic-activity Ni-Se-HREE hydrogen evolution electrode and a preparation method thereof.The atomic content percentage of the surface of the nickel-based hydrogen evolution electrode coating layer is as follows: Se: 6-10%; Gd: 0.1-1.0%, and the rest is Ni; or the atomic content percentage of the surface of the nickel-based hydrogen evolution electrode coating layer is as follows: Se: 5-20%; Lu: 1-5%, and the rest is Ni.After optimization, the hydrogen evolution overpotential of the prepared Ni-Se-HREE hydrogen evolution electrode material is less than or equal to 43 mV; after long-time electrolysis of the electrode for 1200 h, the stability is good, the requirements of low hydrogen evolution overpotential, high catalytic activity and high stability are met, and the electrode can be widely applied to the water electrolysis hydrogen production industry.

The present application relates to the field of soil purification and hydrogen energy technology, and specifically relates to a preparation method of biomass-derived carbon material for absorbing heavy metal ions from soil, comprising the following steps: S1, transplanting plants in soil contaminated by heavy metals, and obtaining plants containing heavy metal ions after normal planting and cultivation for two months; S2, cleaning and freeze-drying the plants containing heavy metal ions to obtain dried plants retaining original tissue structure; S3, calcining the freeze-dried plants retaining original tissue structure, and obtaining carbonized biomass-derived carbon material after cooling. The present application innovates the method for obtaining biomass-derived carbon material, and the preparation process is simple. When the biomass-derived carbon material is used as a catalyst for alkaline water electrolysis hydrogen production, it shows a low hydrogen evolution overpotential. Meanwhile, the biomass-derived carbon material proposed can purify soil and realize high-value utilization of biomass resources in the field of new energy, showing good innovation.