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 discloses a FeS2-RGO composite material, a preparation method and application. The FeS2-RGO composite material is prepared by the following steps: oxidized graphene is dissolved in DMF, then, is added in water solution of iron nitrate nonahydrate and thioacetamide in sequence, and is stirred overnight at a temperature of 85-95 DEG C; and the oxidized graphene is reduced through a hydrothermal reaction for centrifugation, washing and freeze drying to calcine under hydrogen to prepare the FeS2-RGO composite material. The FeS2-RGO composite material can be used for electrocatalytic hydrogen evolution; and as the raw material cost is low, the preparation method is simple, the hydrogen evolution performance is good, and the catalyst stability is high, the difficulty of difficult development to industrialization due to high hydrogen preparation cost in the prior art is preferably solved.

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 relates to a preparation method of a high-efficiency hydrogen evolution (HER) catalyst Ir@NBD-C. The preparation method comprises the following steps: uniformly mixing a defective carbonsubstrate with deionized water; then adding iridium trichloride hydrate, melamine and boric acid, uniformly mixing, and drying to obtain a powder sample; and calcining for 1-2 hours at 600 + / - 50 DEGC in an inert atmosphere to obtain the hydrogen evolution catalyst Ir@NBD-C-600. The growth speed of particles is reduced by utilizing the binding effect of nitrogen and boron on metal single atoms and metal clusters, the diameter of noble metal nanoparticles is reduced to 2 nm or less, and the noble metal nanoparticles are uniformly distributed on the carbon substrate. The particle diameter is reduced, so that the catalyst has a higher specific surface area; and the catalyst can expose more active surfaces beneficial to catalysis. Further, the overpotential of the catalyst under a certain current density in the HER process is obviously reduced; and due to the binding effect of nitrogen and boron, the metal nanoparticles keep good stability in the circulation process.

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 provides a process system for preparing deuterium-depleted water. The process system for preparing the deuterium-depleted water comprises a hydrogen generator, a hydrogen burner and a steam condensing unit which are sequentially connected through a pipeline; and en electrode and an electrolytic cell are arranged in the hydrogen generator, a cathode electrode of the electrode is a platinum electrode, and the platinum electrode is doped with 2-5% phosphorus substances. According to the process system for preparing the deuterium-depleted water, the platinum electrode can keep higherelectrochemical activity in the electrolysis water process, the certain number of phosphorus substances are doped in the platinum electrode to form a Pt-P alloy, a separation coefficient of the platinum electrode for protium and deuterium is obviously improved, cathode electrolysis water provided with the substance is achieved, the electrodeposition rate of deuterium ions in a water solution is much lower than that of protium ions, a large number of deuterium ions are enriched on the cathode, a large number of low-deuterium hydrogen is deposited in the cathode, the obtained low-deuterium hydrogen is burnt, and deuterium content in source water is obviously reduced.

The invention relates to an efficient and porous MoS2-Zn hydrogen evolution electrode. According to the electrode, nanometer-scale molybdenum disulfide particles are adopted as a source of molybdenum, the composite electro-deposition mode is adopted, the nanometer-scale molybdenum disulfide particles, Ni and Zn are all deposited to the surface layer of a conductive substrate, potassium hydroxide solution water-bath constant-temperature treatment is carried out after electro-deposition is completed, and finally the efficient and porous MoS2-Zn hydrogen evolution electrode is prepared. The invention further relates to a preparation method of the efficient and porous MoS2-Zn hydrogen evolution electrode. The method includes the steps of 1, pre-treating the conductive substrate; 2, carrying out composite electro-deposition on the nanometer-scale molybdenum disulfide particles; and 3, carrying out constant-temperature water-bath treatment on the electrode subjected to composite electro-deposition in a constant-temperature water-bath kettle through alkaline liquor for removing Zn. The method has the advantages that the operation is simple, the production cost is low and the structure of a catalyst layer is firm, and the catalytic active hydrogen evolution electrode prepared through the method can be widely applied to the alkaline water electrolysis industry.

The invention relates to a Pt@Ni-SNT / graphene hydrogen evolution catalyst and its preparation method and application, belonging to the technical field of hydrogen production by electrolysis of water. The invention prepares Ni-silicate nanotubes by an in-situ one-step hydrothermal method, coats Pt nanoparticles in the tube wall through the confinement effect of the silicate nanotubes, and composites them with graphene. The silicate nanotubes in the invention can effectively prevent the growth and loss of Pt nanoparticles, and greatly improve their dispersibility, and the Pt can form a synergistic effect with the transition metal Ni to further improve the hydrogen evolution activity of the catalyst. The catalyst obtained in the present invention has excellent hydrogen evolution activity when the loading amount of the noble metal is lower (5wt%), and the current density is 10 mA / cm 2 The overpotential of 167mV is significantly better than that of PtNi alloy / graphene with the same loading, and it is close to commercial 20wt%Pt / C, which has great economic and social value.

The invention discloses a preparation method of a NiMo catalyst supported by a TiO2 nanotube array. The method comprises: preparing TiO2 nanotubes, obtaining oxidized titanium foil, preparing an electroplating liquid, carrying out pre-electrolysis on the plating liquid by taking a graphite rod as a counter electrode, carrying out constant-current electroplating by using a direct-current stabilizedpower supply, putting into a heat collection type magnetic heating stirrer, and carrying out constant-temperature water bath heating, wherein the constant-temperature precision is + / -1 DEG C, the stirring speed is 200 rap / min, the anode is graphite, the cathode is the oxidized titanium foil, the two electrodes are arranged in parallel at an interval of 5-6 cm and are inserted into a position 3-4cm below the liquid level, the electro-deposition time is 1-3 minutes, and a final product is obtained on the cathode. Through structural optimization, the NiMo alloy catalytic material supported by the TiO2 nanotube array and having excellent catalytic performance is obtained, and a purpose of the invention is to explore the way of improving the electro-catalytic performance of the NiMo alloy soas to provide experimental and theoretical basis for developing cheap and efficient electro-catalytic materials.

The invention discloses a titanium electrode used for electrolyzing water and a manufacturing method for the titanium electrode. The titanium electrode comprises a titanium base material and a bromine-doped polylactic acid grafted polyphenylacetylene coating which is electrodeposited on the surface of the titanium base material. According to the titanium electrode disclosed by the invention, the bromine-doped polylactic acid grafted polyphenylacetylene coating is arranged on the surface of the titanium base material. The bromine-doped polylactic acid grafted polyphenylacetylene is a conductive macromolecule with relatively high electric conductivity, and can remarkably improve current efficiency of the titanium electrode while used as the coating, so that relatively high hydrogen evolution activity is guaranteed, and therefore, relatively high electrolytic efficiency is reached.

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 Pd@Ni-SNT / graphene hydrogen evolution catalyst and its preparation method and application, and belongs to the technical field of hydrogen production by electrolysis of water. The present invention prepares Ni-silicate nanotubes through an in-situ one-step hydrothermal method. Through the confinement effect of the silicate nanotubes, Pd nanoparticles are coated in the tube wall and compounded with graphene. The silicate nanotubes in the present invention can effectively prevent the growth and loss of Pd nanoparticles, and greatly improve their dispersion, and Pd can form a synergistic effect with the transition metal Ni to further improve the hydrogen evolution activity of the catalyst. The catalyst obtained by the present invention has excellent hydrogen evolution activity when the loading amount of noble metal is relatively low (6.2wt%), and the current density is 10 mA / cm 2 The overpotential is 170mV, which is significantly better than PdNi alloy / graphene with the same load, close to commercial 20wt% Pd / C, and has great economic and social value.

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 synthetic method of a sheet-shape Co2P-carbon cloth composite material. The method comprises the following steps that 1, a Co (OH) (CO3) 0.5.xH2O / CC compound is synthesized through a hydrothermal method; 2, a phosphorization process is carried out. According to the method, the sheet-shape Co2P is successfully grown on the carbon cloth (Co2P-CC) through a simple method, and has relatively high electrocatalytic activity for a hydrogen evolution reaction under all PH values; and an electrochemical measurement result shows that the sheet-shape Co2P-CC shows up excellent hydrogen evolution activity, when a current density is 10 mA cm<-2>, the electric potential of the sheet-shape Co2P-CC is 103 mV, and a Tafel's slope is 80 mV decade<-1>.

The invention is an emergency power supply, specifically, a metal / seawater battery. The battery has the characteristics of both metal / water battery and metal / air battery. The battery mainly includes a dual-function cathode, an alloy anode, a diaphragm and a battery case. The battery structure is a "sandwich" configuration, with two cathodes sandwiching an anode, the electrodes are separated by a separator, and the battery case is a hollow structure. The invention effectively combines the advantages of the metal / water battery and the metal / air battery. When the battery is floating on the sea surface, the metal / air battery and the metal / water battery are used for dual-mode discharge, and when the battery is full of seawater, the metal / water battery mode is used. Discharge, the dual-mode battery can effectively cope with the complex working environment on the sea. The battery has long storage life, good stability, high mass specific energy and simple structure, and is an ideal sea surface emergency power supply.

The invention discloses a porous nickel-based hydrogen-evolving electrode composite material. The foamed metal of the porous nickel-based hydrogen-evolving electrode is used as a base material, and a S-La-Ni alloy is electrolytically deposited through an ionic liquid, and then the aluminum is removed by corrosion treatment in an alkaline solution to obtain a porous material. Electrode, then sulfur modified by heat treatment, the specific surface area of ​​the composite material is 20‑23g / m 2 , good hydrogen evolution catalytic activity and excellent chemical stability.

The invention discloses a method for preparing a cathode for weakly alkaline beauty water. The cathode uses porous nickel-based hydrogen-evolving electrode foam metal as a substrate, electrolytically deposits a S-La-Ni alloy through an ionic liquid, and then corrodes it in an alkaline solution. Treatment removes aluminum to obtain a porous electrode, and then undergoes sulfur modification by heat treatment. When electrolyzing water to prepare weakly alkaline beauty water, it shows extremely high catalytic activity and chemical stability.

The invention provides a kind of porous Ni-La / foam metal material doped with sulfur as the cathode, and the inert metal material as the anode, through the ion exchange membrane, the electrolytic cell is divided into an anode chamber, an intermediate chamber and a cathode chamber, and the middle The mixed solution of potassium carbonate, potassium bicarbonate and purified water is introduced into the room, the water is purified into the cathode chamber and the anode chamber, and the power is turned on for electrolysis to obtain a fungicide. The pH of the fungicide is 12.5±0.3, and no surface activity is added. Antiseptics, preservatives or other additives, the main components are purified water and trace mineral elements, and the cleaning effect of the bactericides is >99.9%.

The application belongs to the technical field of solid oxide electrolytic cells, and in particular relates to a hydrogen electrode of a solid oxide electrolytic cell, a preparation method thereof, and a solid oxide electrolytic cell. The preparation method of the present application includes the following steps: step 1, mixing NiO, yttria-stabilized zirconia, a second pore-forming agent and a solvent to obtain a second mixture, placing the second mixture on the surface of the hydrogen electrode support, and drying Pre-sintering after drying to obtain a pre-hydrogen electrode; wherein, the mass ratio of NiO to yttria-stabilized zirconia is (0.6 to 2.3): 1; step 2, the nanoparticles are arranged on the pre-hydrogen electrode, and then sintered to obtain Hydrogen electrode for solid oxide electrolysis cells. The application discloses a hydrogen electrode of a solid oxide electrolytic cell and a preparation method thereof, which can effectively solve the technical problem of poor uniformity and controllability of the pore structure and porosity of the existing Ni-YSZ porous cermet.

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 no-clean hand sanitizer. The hand sanitizer comprises 96-99 wt.% of hyperalkaline ionized water, 0.01-0.05 wt.% of essence, 0.5-2 wt.% of a surfactant and 0.5-2 wt.% of a wetting agent. The hyperalkaline ionized water is obtained by taking a sulfur-doped porous Ni-La / foam metal material as a negative electrode and an inert metal material as a positive electrode and electrolyzing purified water. The no-clean hand sanitizer is green, environment-friendly, bactericidal and non-toxic, is harmless to human skin and is a green and efficient hand sanitizer.

The invention provides beauty water which is obtained by electrolyzing and purifying water by taking a sulfur-doped porous Ni-La / foam metal material as a cathode, the oxidation-reduction potential of the beauty water is negative, the pH value is maintained at 8.5-9.5 for more than or equal to 60 days under normal-temperature and normal-pressure sealing conditions, and the ORP range of the newly prepared beauty water is -27 mV to -120mV.

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.