34results about How to "Improve hydrogen evolution activity" patented technology

The invention discloses a preparation method of a Ni3Fe-loaded nitrogen-doped carbon nanometer composite material, and a product and applications thereof. The preparation method comprises following steps: 1, a Ni<2+>/Fe<3+>/PVP mixed sol is prepared; 2, the Ni<2+>/Fe<3+>/PVP mixed sol is subjected to electrostatic spinning so as to obtain solid carbon fiber film; 3, the solid carbon fiber film issubjected to pre-oxidation at air atmosphere at 200 to 300 DEG C, programmed heating is adopted for heat processing at 400 to 1000 DEG C at an inert atmosphere so as to obtain the Ni3Fe-loaded nitrogen-doped carbon nanometer composite material. The preparation method is low in cost, is easy, and is universal; the obtained Ni3Fe-loaded nitrogen-doped carbon nanometer composite material is of a one-dimensional composite structure (carbon nanometer fiber and carbon nanotube); Ni3Fe alloy particles can be embedded into the carbon nanometer fiber and carbon nanotube uniformly; the Ni3Fe-loaded nitrogen-doped carbon nanometer composite material can be taken as a water electrolysis hydrogen evolution electrocatalytic material, and possesses relatively high activity and excellent stability.

The invention discloses a preparation method of polyatomic co-doped molybdenum disulfide. Specifically, the method comprises the following steps: firstly, uniformly dispersing a plurality of doped atom precursors with a molybdenum source in sequence, then reacting with a sulfur-containing compound at a certain temperature, finally, carrying out solution treatment, and carrying out suction filtration and drying to obtain a target product. The material prepared by the method has a clear structure, a single crystal image and no cluster or non-molybdenum disulfide crystal image formation. The types and the contents of the doped heteroatoms are easy to modulate. The material has excellent activity when being used for electrocatalytic hydrogen evolution reaction. The method is a universal methodfor preparing polyatomic co-doped molybdenum disulfide, and has the characteristics of being simple and easy to operate.

The invention belongs to the technical field of electrolytic hydrogen production and particularly discloses a ruthenium-phosphorous co-modified compound catalyst. The ruthenium-phosphorous co-modifiedcompound catalyst comprises elemental ruthenium and nickel phosphide, wherein the elemental ruthenium is embedded into the nickel phosphide. The invention also discloses a preparation method of the ruthenium-phosphorous co-modified compound catalyst. The preparation method of the ruthenium-phosphorous co-modified compound catalyst comprises the following steps of (1) oxidizing foamed nickel to prepare rough-surfaced and nickel oxide-containing foamed nickel; (2) taking the nickel-containing foamed nickel as the anode, a carbon rod as the cathode, and a mixed solution of pH electrolyte regulator, ruthenium sources and phosphorous sources as electrolyte solution for polarization through the same potential cathode to obtain the ruthenium-phosphorous co-modified compound catalyst. The prepared ruthenium-phosphorous co-modified compound catalyst is comparable in hydrogen evolution activity with Pt catalysts.

The invention discloses a preparation method of a sulfide-graphene composite material photoelectric catalyst. The preparation method comprises the following steps: first, dispersing graphene oxide powder in water to obtain a graphene oxide dispersion liquid; then, adding soluble metal salt into the dispersion liquid, stewing the liquid, washing precipitates, and drying and grinding the precipitates to obtain metal ion-doped graphene oxide powder; dispersing the powder into deionized water again, stirring the powder, adding a sulfide precursor salt solution, adding thiourea, stirring the materials, obtaining a reaction product according to a one-step hydrothermal method, naturally cooling the product to room temperature, centrifugally washing the reaction product, and drying the product toobtain solid powder. The preparation method of a sulfide/graphene compound is simple; metal ions are used as an interface connection agent for sulfide and the surface of the graphene and a seed layerfor sulfide growth, so that uniform dispersion of a sulfide sheet layer is promoted, and stacking of the sulfide sheet layer is inhibited; a large specific surface area can provide a plurality of active sites, so that the catalysis performance of a composite material is effectively improved.

The invention belongs to the technical field of solid oxide electrolytic cells, and particularly relates to a hydrogen electrode of a solid oxide electrolytic cell, a preparation method of the hydrogen electrode, and the solid oxide electrolytic cell. The preparation method comprises the following steps: step 1, mixing NiO, yttria-stabilized zirconia, a second pore-forming agent and a solvent to obtain a second mixture, arranging the second mixture on the surface of a hydrogen electrode support body, conducting drying, and performing presintering to obtain a pre-hydrogen electrode, wherein a mass ratio of NiO to yttria-stabilized zirconia is (0.6-2.3): 1; and step 2, arranging nanoparticles on the pre-hydrogen electrode, and conducting sintering to obtain the hydrogen electrode of the solid oxide electrolytic cell. The hydrogen electrode of the solid oxide electrolytic cell and the preparation method of the hydrogen electrode in the invention can effectively solve the technical problems of poor uniformity and controllability of a pore structure and porosity of existing Ni-YSZ porous metal ceramic.

The invention discloses an electrolytic water catalytic material of a gold-copper twin structure. The electrolytic water catalytic material is a nano-particle/carbon nanofiber hybrid material of the gold-copper twin structure. According to the electrolytic water catalytic material, the size of the gold-copper twin structure nanometer material is uniform, no obvious agglomeration phenomenon exists, a large number of nanometer interfaces of the electrolytic water catalytic material can effectively improve the catalytic activity, and good stability and repeatability are achieved.

The invention discloses a full-pH electrocatalytic hydrogen evolution molybdenum disulfide modified sulfur and molybdenum co-doped graphite-phase carbon nitride heterostructure material and a preparation method thereof. Firstly, melamine is taken as a precursor for synthesizing graphite-phase carbon nitride, and ammonium molybdate and thiourea are taken as metal sources; in the melamine polycondensation process, non-metallic elements are introduced through a two-step heat treatment method, metal atoms are anchored, generation of by-products is avoided, and the doping effect is adjusted by adjusting the adding proportion of metal and non-metal precursors; secondly, uniform growth of molybdenum disulfide nanosheets at nucleation sites on the surface of the substrate and strong coupling of the molybdenum disulfide nanosheets and a sulfur and molybdenum co-doped graphite phase carbon nitride material are realized by controlling the proportions of ammonium molybdate, thiourea and sulfur and molybdenum co-doped graphite phase carbon nitride by adopting a hydrothermal method. The method disclosed by the invention is simple to operate and good in repeatability, the formation and regulation of the structure can be efficiently realized, the effective transfer of active sites under different pH values can be realized, and the efficient proceeding of the electro-catalytic hydrogen evolution reaction is realized.

The invention provides a preparation method of an MOF-derived CoP hydrogen evolution catalyst, and particularly relates to a method which comprises the following steps: firstly, preparing an MOF structure ZIF-67, then carrying out oil bath on the ZIF-67 and cobalt nitrate hexahydrate to generate ZIF-67@Co, then calcining the ZIF-67 or the ZIF-67@Co to generate cobaltosic oxide and then performing phosphorizing or directly performing phosphorizing to obtain the MOF-derived CoP hydrogen evolution catalyst. The MOF-derived CoP hydrogen evolution catalyst prepared by the method disclosed by the invention has relatively high electro-catalytic hydrogen evolution activity and stability.

The invention discloses a preparation method of a metal organic framework material (Ru/Cu-BTC) with enhanced water stability and photocatalytic activity and application of the metal organic framework material in photocatalytic water desorption for hydrogen evolution. The preparation process of the water-unstable Cu-BTC material and the enhanced stable material Ru/Cu-BTC comprises the following steps: (1) ultrasonically dispersing Cu (NO3) 3.3 H2O (0.725 g) and H3BTC (0.420 g) in a mixed solution of water and ethanol, then transferring into a reaction kettle to react for 24 hours at the temperature of 150 DEG C, cooling, centrifuging the obtained blue solid product, washing with deionized water and ethanol for multiple times, and finally carrying out vacuum drying at 80 DEG C for 12 hours; and (2) dispersing the prepared Cu-BTC into water, then adding a certain amount of RuCl3, stirring for 12 hours, then centrifuging, and carrying out vacuum drying to obtain the product Ru/Cu-BTC. The Ru/Cu-BTC material prepared by the invention not only can enhance the stability of Cu-BTC in water, but also can improve the photocatalytic activity and promote photocatalytic hydrogen evolution from water, and the hydrogen evolution rate of the Ru/Cu-BTC material is improved by 50% compared with that of pure Cu-BTC and is as high as 15814.8 [mu] mol.g <-1 >. H <-1 >.

The invention relates to a Pt@Ni-SNT/graphene hydrogen evolution catalyst as well as a preparation method and application thereof, and belongs to the technical field of water electrolysis hydrogen production. Ni-silicate nanotubes are prepared through an in-situ one-step hydrothermal method, Pt nanoparticles are coated with the tube walls of the Ni-silicate nanotubes through the confinement effectof the silicate nanotubes, and the Pt nanoparticles are compounded with graphene. The silicate nanotubes can effectively prevent growth and loss of the Pt nanoparticles, the dispersity of the Pt nanoparticles is greatly improved, Pt and transition metal Ni can form a synergistic effect, and the hydrogen evolution activity of the catalyst is further improved. The catalyst obtained by the inventionhas excellent hydrogen evolution activity when the loading capacity of noble metal is relatively low (5wt%); and the overpotential at the current density of 10 mA/cm < 2 > is 167 mV, is obviously superior to that of PtNi alloy/graphene with the same loading capacity, and is close to that of commercial 20 wt% Pt/C, and the Pt@Ni-SNT/graphene hydrogen evolution catalyst has great economic and social values.

According to the invention, a sulfur-doped porous Ni-La/foam metal material is used as a cathode, an inert metal material is used as an anode, an electrolytic cell is divided into an anode chamber, amiddle chamber and a cathode chamber through an ion exchange membrane, a mixed solution of potassium carbonate, potassium bicarbonate and purified water is introduced into the middle chamber, water ispurified into the cathode chamber and the anode chamber, and the power supply is powered on to electrolyze to obtain the bactericide, wherein the pH value of the bactericide is equal to 12.5 +/-0.3,no surfactant, preservative or other additive is added, the main components are purified water and trace mineral elements, and the cleaning effect of the bactericide is greater than 99.9%.

The invention relates to a preparation method of a nitrogen-doped porous carbon microsphere coated Ni/Co alloy, which comprises the following steps: adding pectin, melamine, cobalt nitrate and nickel nitrate into deionized water, and carrying out hydrothermal reaction to obtain an intermediate product; and carbonizing the intermediate product in a nitrogen atmosphere to obtain the nitrogen-doped porous carbon microsphere coated Ni/Co alloy. The nitrogen-doped porous carbon microsphere coated Ni/Co alloy is prepared through a simple hydrothermal method. The preparation method has the advantages of few reaction steps, low consumption of chemical reagents, simplicity in operation, short reaction period, wide sources of raw materials, simplicity, easiness in obtaining, energy conservation, environment friendliness and cost saving.

The invention discloses a preparation method of a cathode for weak alkaline beauty water. The preparation method comprises the following steps: using porous nickel-based hydrogen evolution electrode foam metal as a base material, carrying out electrolytic deposition on an S-La-Ni alloy by using an ionic liquid, removing aluminum by corrosion treatment in an alkaline solution to obtain a porous electrode, and carrying out sulfur modification by heat treatment. When the weak alkaline beauty water is prepared by electrolyzing water, extremely high catalytic activity and chemical stability can be shown.

The invention discloses a porous nickel-based hydrogen evolution electrode composite material. According to the porous nickel-based hydrogen evolution electrode, foam metal serves as a base material, an S-La-Ni alloy is deposited through ionic liquid electrolysis, then aluminum is removed through corrosion treatment in an alkaline solution to obtain a porous electrode, sulfur modification is conducted through heat treatment, the specific surface area of the composite material is 20-23 g/m <2>, the hydrogen evolution catalytic activity is good, and the chemical stability is excellent.