23results about How to "Increase active area" patented technology

The invention provides a supported IrOx catalyst as well as a preparation method and application thereof. The supported IrOx catalyst comprises an oxide carrier and an active component supported on the carrier, the active component comprises an Ir elementary substance and amorphous IrOx coated on the surface of the Ir elementary substance; and the crystal structure of the IrOx is long-range disordered and short-range ordered. The preparation method of the supported IrOx catalyst is convenient to implement, high in reproducibility and beneficial to industrial preparation and production, gram-level batch preparation can be achieved under the laboratory condition, and possibility is provided for large-scale preparation of the low-cost, high-activity and high-stability proton exchange membrane water electrolysis hydrogen production anode catalyst.

The invention is suitable for the technical field of OER catalysts, and provides a preparation method of a nanowire array composed of a ferrocobalt-based heterostructure, and the preparation method comprises the following steps: pretreating a foamed nickel substrate; performing in-situ growth of a precursor CoFe-LDH nanosheet on the NF through a hydrothermal method; and synthesizing the nanowire array composed of the ferrocobalt-based heterostructure: putting a precursor into a muffle furnace, heating, keeping the temperature so that the precursor is thoroughly converted into a Co-Fe-O intermediate, immersing NF on which the intermediate grows into a polytetrafluoroethylene reaction kettle lining, carrying out a hydrothermal reaction, and naturally cooling to the room temperature to obtain a Co9S8-Fe3O4 / VNF composite material (the vulcanized NF is abbreviated as VNF), so that the nanowire array composed of the ferrocobalt-based heterostructure and the Co9S8-Fe3O4 / VNF composite material is obtained. The nanowire array is composed of a ferrocobalt-based heterostructure. The invention further provides a nanowire array composed of the ferrocobalt-based heterostructure and application of the nanowire array in preparation of a working electrode of an oxygen evolution reaction catalyst. According to the heterostructure catalyst provided by the invention, the adsorption strength of an OER intermediate can be optimized to realize high intrinsic OER activity, and efficient and stable water decomposition is realized.

The invention relates to a nickel sulfide / cadmium sulfide / sulfur-doped graphite-like carbon nitride double-heterojunction composite photocatalyst and a preparation method thereof, and belongs to the technical field of photocatalysis. S-doped g-C3N4 nanosheet powder, nickel chloride hexahydrate, cadmium acetate, thioacetamide, cetyltrimethylammonium bromide and polypyrrole are uniformly mixed in ammonia water; the molar ratio of the nickel chloride hexahydrate to the cadmium acetate to the thioacetamide is (1-5): (1-6): (2-12); the precursor solution is subjected to heat preservation treatment at the temperature of 120-180 DEG C to obtain a reaction solution, precipitates in the reaction solution are washed and then dried, separation and transmission of photogenerated charges are effectively promoted, a rapid charge transfer way is provided for rapid migration of electrons-holes in the catalysis process through a double-heterogeneous interface, and therefore the purpose of accelerating separation of the photogenerated charges is achieved; finally, the photocatalytic hydrogen evolution activity of the g-C3N4 can be obviously improved.

The invention relates to a copper-cobalt modified photocathode and preparation thereof and application of the copper-cobalt modified photocathode in photoelectrocatalysis of urea synthesis, and belongs to the technical field of electrode materials, a copper-cobalt double-monatomic coating layer is constructed on the surface of a Cu2O nanorod, the copper-cobalt modified photocathode material Cu2O coated Cu1Co1 / NC is prepared, the corrosion resistance of the Cu2O photocathode is improved, and meanwhile, the photocathode material Cu2O coated Cu1Co1 / NC can be applied to photoelectrocatalysis of urea synthesis. And the double active centers are also utilized to improve the efficiency of preparing urea by catalyzing CO2 / NO3 <-> reduction by the Cu2O photocathode.

The invention discloses an electrochemical preparation method of a component-controllable indium-indium oxide nanosphere composite catalyst and CO2 reduction application of the component-controllable indium-indium oxide nanosphere composite catalyst. The component-controllable indium-indium oxide nanosphere composite catalyst is prepared from indium nitrate, urea, trisodium citrate, deionized water, absolute ethyl alcohol, a carbon paper electrode and Nafion. Different indium oxide nanosphere precursors are synthesized under the high-temperature and high-pressure reaction conditions of a one-step hydrothermal method, the precursors are placed in a muffle furnace to be subjected to high-temperature calcination to obtain indium oxide nanospheres, the obtained indium oxide nanospheres are subjected to electrode sheet preparation, and the indium-indium oxide nanosphere composite catalyst with controllable components is obtained through electrochemical reduction treatment. The composite material is applied to CO2 electrochemical reduction.

The invention relates to an oxygen evolution catalyst for hydrogen production through electrolysis of proton exchange membrane water, a membrane electrode and a preparation method of the membrane electrode, and the oxygen evolution catalyst is iridium oxide in a nanoparticle form and contains 2-2.5% of crystal water; the preparation method of the catalyst comprises the following steps: carrying out ultrasonic treatment on an iridium salt solution, mixing the iridium salt solution with magnesium sulfate and water, carrying out ultrasonic treatment, volatilizing a solvent, drying, carrying out ball milling to obtain powder, carrying out high-temperature calcination, dissolving with dilute acid, carrying out suction filtration with water and ethanol until the conductivity is less than 10 [mu] s / cm, carrying out vacuum drying to remove moisture, and grinding to obtain the catalyst. The membrane electrode comprises the catalyst powder prepared by the method and an anode catalyst layer formed by perfluorinated sulfonic acid resin; and the cathode catalyst layer is formed by Pt / C and perfluorosulfonic acid resin. The oxygen evolution catalyst provided by the invention has high activity and high stability, magnesium sulfate is adopted in the preparation method, and the oxygen evolution catalyst has the advantages of simple operation, low cost and the like.

The invention relates to the technical field of solid oxide fuel cells, in particular to a solid oxide fuel cell electrolyte with a rotary honeycomb structure as well as preparation and application of the solid oxide fuel cell electrolyte. The solid oxide fuel cell electrolyte with the rotary honeycomb structure is obtained by rotating the solid oxide fuel cell electrolyte with the honeycomb structure along x, y and z three-direction center points as original points; wherein the rotation angle ranges from 15 degrees to 90 degrees. According to the invention, the specific surface area is increased by rotating the honeycomb structure, and the volume is not changed because the sum of three normal stresses is zero during rotation, so that the surface area-volume ratio of the electrolyte of the battery is effectively improved, and the active area of reaction with reaction gas is increased; the production cost is reduced, the development of the mobile portable application field is promoted, and the defects in the prior art are overcome.

The invention relates to a preparation method of a phosphorus defect bimetallic oxygen evolution catalyst. The preparation method comprises the following steps: S1, dissolving 2.4 mmol of nickel chloride hexahydrate, 0.8 mmol of vanadium chloride and 300mg of urea in 80ml of deionized water, and uniformly stirring for 10 minutes; s2, putting a product obtained in the step S1 and foamed nickel into a 100ml reaction kettle, reacting at 120 DEG C for 12 hours, and drying in a drying box after reaction; s3, putting the product in S2 and 0.8 g of sodium dihydrogen phosphate into a tubular furnace, heating to 350 DEG C at a heating rate of 3 DEG C / min in an argon atmosphere, and reacting for 3 hours to obtain nickel vanadium phosphide loaded foamed nickel; and S4, the product obtained in the S3 is put into a sodium borohydride solution to be soaked for 30 min, the product is taken out and dried, and a final product, namely the nickel vanadium phosphide loaded foamed nickel with the vacancy defect, is obtained.

The invention belongs to the technical field of electrolysis water oxygen evolution reaction catalysis, and relates to a preparation method and application of a Ru-FeOOH / NF integrated electrocatalyst for electrolysis water oxygen evolution, and the method comprises the following steps: immersing foamed nickel in an acetone solution, a hydrochloric acid solution and deionized water in sequence for ultrasonic cleaning, and carrying out vacuum drying for later use; the preparation method comprises the following steps: dissolving ferric salt and ruthenium salt in a molar ratio of (0.1-5): (0.01-0.5) in deionized water, then adding a certain amount of hydrogen peroxide into the deionized water, and uniformly stirring to obtain a mixed solution; placing the mixed solution and foamed nickel at 90-130 DEG C for hydrothermal reaction for 5-12 hours; and then carrying out ultrasonic washing and vacuum drying to obtain the Ru-FeOOH / NF electrocatalyst. According to the method, the Ru-FeOOH composite catalyst grows on the foamed nickel in situ through a simple one-step hydrothermal synthesis method, uniform dispersion and efficient catalysis of the catalyst are achieved, and the method is simple in step and suitable for large-scale production.

The invention belongs to the technical field of fuel cells, and particularly relates to a methanol fuel cell catalyst and a preparation method thereof.The methanol fuel cell catalyst is composed of a CeO2 / r-GO composite material loaded with LaFeCoO3 perovskite metal oxide, LaFeCoO3 has excellent ionic conductivity, good proton transmission performance and high activity, r-GO has a large specific surface area, and the specific surface area of the catalyst is larger than that of the CeO2 / r-GO composite material loaded with LaFeCoO3 perovskite metal oxide. The active area of the carrier is increased by adding CeO2, a large number of attachment sites are provided for loading LaFeCoO3, the interfacial effect between CeO2 / r-GO can enhance electron transfer, promote interaction between metal and the carrier and enhance the dispersity and stability of LaFeCoO3, the comprehensive catalytic efficiency is remarkably improved, the prepared catalyst does not involve precious metal, and the cost is reduced.

The application discloses a kind of multi-level hole metal catalytic electrode and preparation method thereof, and preparation method includes using physical vapor deposition on foam nickel substrate magnetron sputtering film forming, forms nickel coating;Nickel coating is deposited in electrode in lye and is soaked, cleaning, i.e. the multi-level hole catalytic electrode with microporous and nanopore structure is obtained.The application constructs the microporous structure of nanometer grade on the flat skeleton of foam nickel substrate by magnetron sputtering and the post-processing method of lye soaking, significantly increases specific surface area.It is rich in surface structure, increases the active area of catalytic electrode, and then realizes the significant promotion of utilization efficiency and hydrogen evolution catalytic performance of nickel catalyst, and has better binding force simultaneously.

The invention discloses a biochar-polyurethane carbon anode material, a preparation method thereof, a microbial fuel cell and application, biochar, polyol, triethanolamine, water and isocyanate are added into a mold to be mixed to obtain a mixture, the mixture reacts under stirring until white floating foam appears, then standing foaming is performed, carbonization is performed after the material is cured, and the biochar-polyurethane carbon anode material is obtained. The internal resistance of a double-chamber microbial fuel cell constructed by taking the carbonized biochar-polyurethane material as an anode of MFCs is not greater than 3.00 omega, the highest voltage stably exceeds 620 mV, the maximum area power density exceeds 800 mW m <-2 >, and the COD removal rate of the biochar-polyurethane carbon anode material disclosed by the invention reaches 97.24%.

The present application discloses a membrane-electrode assembly, which has an increased active area, improved fluid control capability and reduced gas transmission resistance due to electrodes with patterned structures on both sides. The present application also discloses a method for manufacturing the membrane-electrode assembly and a fuel cell including the membrane-electrode assembly. The membrane-electrode assembly according to the present invention includes: a first electrode; a second electrode; and a polymer electrolyte membrane between the first electrode and the second electrode, wherein the first electrode has a first surface facing the polymer electrolyte membrane and a second surface opposite to the first surface, the first surface has a first patterned structure, and the second surface has a second patterned structure.

The invention discloses a perovskite SrLaFeO4 / FOOH heterojunction electrochemical catalyst as well as a preparation method and application thereof, and belongs to the technical field of electrochemical catalysis. The perovskite SrLaFeO4 / FOOH heterojunction electrochemical catalyst is prepared by taking lanthanum nitrate, cobalt nitrate and strontium nitrate as a lanthanum source, a cobalt source and a strontium source respectively and adopting a sol-gel method and a water bath heating strategy. The OER activity of the SrLaCoO4 perovskite catalyst is improved by growing the FeOOH film on the surface of the perovskite, and the optimized catalyst has relatively low overpotential and relatively small Tafel slope. XPS and electrochemical impedance spectroscopy analysis show that the excellent OER catalytic performance of the obtained catalyst can be attributed to the synergistic effect of SrLaCoO4 and FeOOH, strong electron interaction is promoted, charge transfer is promoted, and active sites are improved.

The invention belongs to the technical field of all-vanadium liquid flow battery electrodes, and discloses a hollow core-shell nanosphere composite graphite felt for vanadium batteries and a preparation method thereof, comprising the following steps: graphite felt pretreatment; silica sol preparation; titanium dioxide@silicon dioxide sol preparation; metal oxide@titanium dioxide@silicon dioxide core-shell nanosphere preparation; composite graphite felt electrode preparation; and hollow core-shell nanospheres are synthesized layer by layer through self-assembly by a sol-gel method, the structure is stable, the effective active area is increased, and by compounding a plurality of oxygen evolution inhibitors, the amount of oxygen released in the positive electrode electrolyte is effectively reduced compared with a single inhibitor, the oxygen evolution side reaction is inhibited, the utilization rate of the electrolyte is improved, and the energy loss caused by the side reaction during battery operation is reduced.

The application provides a laser scribing method and system of a perovskite solar module, and a solar cell, and belongs to the technical field of solar cells. The method comprises the following steps: after forming various functional layers on a transparent conductive oxide layer, firstly performing P2 scribing to form a P2 channel in the various functional layers, and exposing a local area of the transparent conductive oxide layer at the bottom of the P2 channel; the functional layers comprise an electron transport layer, a perovskite active layer and a hole transport layer; forming a top electrode layer on the functional layer after the P2 scribing is completed, and filling the top electrode layer into the P2 channel and connecting with the exposed local area of the transparent conductive oxide layer; after forming the top electrode layer, under the condition that the relative positions of a P1 scribing laser beam and a P3 scribing laser beam are fixed, synchronously performing P1 scribing and P3 scribing. The application eliminates systematic alignment errors, can greatly improve the yield, improve the module efficiency, and reduce the cost.

The application relates to an insulated gate high electron mobility transistor and a preparation method thereof, and the preparation method comprises the following steps: 1, epitaxial material growth; 2, vertical structure realization; 3, drain electrode manufacturing; 4, source electrode manufacturing; 5, ohmic metal annealing; 6, dielectric layer deposition; 7, gate electrode manufacturing; and 8, manufacturing of an interconnection lead. The application can solve the problems that the threshold voltage of a conventional GaN-based high electron mobility transistor device is less than 0 and the withstand voltage capacity is poor.

The invention discloses a TVS (Transient Voltage Suppressor) device and a preparation method thereof, and the TVS device comprises a substrate; a plurality of tube cores and a plurality of scribing channels, wherein the tube cores and the scribing channels are arranged on one side of the substrate at intervals; the scribing channel is provided with a first groove, the first groove extends into the substrate, and the side wall of the first groove is provided with an insulating isolation layer; the scribing channels insulate and isolate the adjacent tube cores; and the first electrode is positioned on one side, far away from the tube core and the scribing channel, of the substrate. According to the technical scheme, deep groove isolation columns do not need to be formed at the edges of the tube cores, isolation of the independent tube cores can be achieved through the scribing channel area, and the area of the active area of the TVS device can be effectively increased. And meanwhile, the manufacturing processes of isolating the independent tube core and forming the scribing groove to separate the independent tube core are integrated, so that the preparation process of the TVS device is simplified, and the cost can be effectively reduced.

The utility model provides a subsurface safety valve, and relates to the technical field of subsurface tools in the petroleum and natural gas industry, the subsurface safety valve comprises an upper joint, a piston cylinder and a lower joint which are communicated in sequence, the piston cylinder is provided with at least two piston holes which are communicated with each other, each piston hole is internally provided with a piston assembly, and the piston cylinder is internally provided with a push rod; the push rod is clamped with the at least two piston assemblies; a closing device is arranged in the lower joint; at least two piston structures are adopted, namely, at least two piston holes provided with piston assemblies are formed, and the two piston holes are communicated, so that the pressures in the at least two piston holes are consistent, the at least two piston assemblies can be controlled by one hydraulic control pipeline, and the activation area of the piston is increased by the at least two piston assemblies; the pressure needed to be released when the pressure control pipeline drives the push rod to move through the piston assembly is reduced, then the hydraulic force needed to be provided when the subsurface safety valve is opened is reduced, and deformation and damage of the subsurface safety valve caused by large valve opening pressure are avoided.

The present invention relates to the field of electrocatalysis technology, and discloses a nickel foam self-supporting cobalt nickel bimetallic sulfide heterojunction electrocatalytic composite material and its preparation method and application. The preparation method comprises: dissolving a cobalt salt and 2-methylimidazole in water to obtain a mixed solution; immersing a nickel foam substrate in the mixed solution to obtain a zeolite imidazole ester framework material with nickel foam as a carrier, calcining in an inert atmosphere to obtain a metal organic framework material, adding a thiourea solution for hydrothermal reaction, and obtaining a nickel foam self-supporting cobalt nickel bimetallic sulfide heterojunction electrocatalytic composite material Co3S4 / Ni3S2 / NF, wherein the electrocatalytic composite material has a stable three-dimensional cross-intersecting nanosheet structure, avoids the problems of the composite material falling off and dissolving during the reaction, significantly improves the stability, has a synergistic effect between the heterogeneous interfaces, and a large specific surface area and abundant vacancies are conducive to exposing active sites, thereby simultaneously showing excellent electrocatalytic performance and high stability in UOR and OER.

The application aims to provide a ruthenium molybdenum alloy composite defect type molybdenum oxide electrocatalyst, a preparation method and application thereof, and belongs to the technical field of electrocatalysts. The preparation method comprises the following steps: (1) adding a foamed nickel into a molybdenum salt solution, carrying out a hydrothermal reaction to obtain a Mo-O precursor, and then carrying out joule heating on the precursor to obtain a Mo / MoO x precursor; (2) soaking the Mo / MoO x precursor in a ruthenium salt solution to obtain a Ru-Mo-O precursor; and (3) carrying out joule heat pyrolysis on the Ru-Mo-O precursor under a reducing atmosphere, and obtaining the ruthenium molybdenum alloy composite defect type molybdenum oxide electrocatalyst after the pyrolysis is completed. The prepared RuMo / MoO x electrocatalyst has the advantages of uniform size and large specific surface area, and has good catalytic activity and stability, and can be used for electrocatalytic splitting of water to produce hydrogen in a full pH range.

The invention belongs to the technical field of battery materials and energy storage, and particularly relates to application of a carbon nanofiber electrode material with high hydrogen evolution overpotential and high activity in a vanadium battery. The preparation method of the carbon nanofiber electrode material comprises the following steps: taking ammonium bismuth citrate as a functional component, adding the functional component into a solution of polyacrylonitrile and N, N-dimethylformamide to prepare an electrospinning precursor solution, preparing polyacrylonitrile-based three-dimensional nanofiber containing ammonium bismuth citrate by utilizing an electrospinning technology, and then performing pre-oxidation and carbonization to obtain the carbon nanofiber electrode material. In the process, bismuth, nitrogen and oxygen components can be introduced into the carbon fiber at the same time by utilizing pyrolysis of ammonium bismuth citrate, so that the carbon nanofiber electrode material is endowed with relatively high hydrogen evolution overpotential and high activity, the synergistic effect of the components can be brought into full play when the carbon nanofiber electrode material is used as a vanadium battery negative electrode material, and the energy conversion efficiency and the rate capability of a battery are effectively improved. The method is simple, high in practicability, suitable for large-scale production and wide in application prospect.

The invention relates to a corrosion-resistant copper foil anode coating and a preparation method thereof, and belongs to the technical field of electrolytic copper foils. The coating is attached to the surface of a titanium substrate and comprises a three-layer structure, wherein a bottom layer is composed of NiO; the middle layer is formed by pinning crystal lattices with a solid solution network and filling pores in a dispersion manner, so that the porosity is lower than 5%; the surface layer is composed of a ternary solid solution and nitrogen-doped graphene. By means of the three-layer functional gradient design, interface chemical bonding, middle layer compact barrier and surface layer high-activity cooperation are achieved, and the corrosion resistance and the electrocatalytic activity of the anode are remarkably improved.