152 results about "Hydrogen permeation" patented technology

The invention belongs to the technical field of petroleum refining, and relates to a high-purity hydrogen recovery process for improving denitrification efficiency based on a PSA (Pressure Swing Adsorption) device, which comprises the following steps: carrying out primary adsorption impurity removal after pretreatment and pressure regulation on raw material gas, carrying out gas-liquid separation, pretreatment and pressure regulation on the obtained hydrogen-rich gas, and then carrying out membrane separation; the generated hydrogen-rich permeated gas is subjected to pressure regulation and then is sequentially input into a second-stage PSA device and a third-stage PSA device for further adsorption and purification, and finally finished hydrogen with the purity not lower than 99.9% is obtained. The membrane separation technology is adopted for selective separation of hydrogen and nitrogen, the membrane separation unit is arranged at the outlet of the first-stage PSA device, nitrogen is removed from the source, meanwhile, desorbed gas of the third-stage PSA device and retention gas of the membrane separation unit are combined for combustion, nitrogen accumulation in the system is avoided, the nitrogen circulation amount in the system is reduced, and the energy consumption of the system is reduced. The hydrogen recovery rate can be effectively improved while the adsorption efficiency is improved, the process is simple, the investment cost is low, the implementation period is short, and remarkable economic benefits and process advantages are achieved.

According to the efficient and powerful cleaning system and method for the stainless steel cold-rolled steel strip, through cooperation of an electrolytic cleaning unit (the current density is 18-200 A / dm < 2 >), a multi-stage coupling unit (alkali spraying, electrolysis, high-pressure water scrubbing and air purging) and a dynamic control unit (current self-adaption based on roughness Rz), the efficient and powerful cleaning of the stainless steel cold-rolled steel strip is achieved; the oil stain stripping rate is not less than 99%, the hydrogen permeation amount is reduced by 67%, the residual alkali liquor is not more than 0.5 g / m < 2 >, and Ra is not more than 0.5 mu m. And the current efficiency is improved to 85% by adopting a bipolar electrode and a vertical injection design, the surface quality is strengthened by combining a hydrophobic roller and passivating treatment, and the device is suitable for high-speed continuous production.

The invention relates to the technical field of natural gas transportation safety, in particular to a hydrogen embrittlement risk online monitoring system and method for a hydrogen-doped natural gas pipeline based on multi-parameter fusion, and the system comprises a sentry sensing unit which adopts a metal short pipe which is the same as a to-be-monitored hydrogen-doped natural gas main pipeline in property, material, process, wall thickness and service history, an internal circulating medium is kept consistent with the main pipeline; the risk sensor is provided with a multi-parameter sensor to obtain risk sensing parameters including hydrogen permeation current, pipe wall micro-strain and temperature signal parameters; the signal processing unit is connected with the sentry sensing unit, receives the risk sensing parameters and analyzes and generates hydrogen embrittlement risk indexes through a risk analysis model; and the risk warning unit is connected with the signal processing unit, and triggers a danger prompt signal when the hydrogen embrittlement risk index is greater than a preset safety index. The method has the effect of meeting the danger monitoring effectiveness of safe operation of the hydrogen-doped natural gas pipeline.

The invention provides a quantitative detection method for the average pressure of hydrogen in a PEM electrolyzed water cathode catalyst layer, and relates to the technical field of hydrogen production by electrolyzed water. The quantitative detection method comprises the following steps: carrying out a hydrolysis reaction in a PEM electrolytic cell, and calculating a hydrogen permeation flux N1 and a corresponding back pressure P1 under an electrolysis working condition; in another PEM electrolytic cell with the same structure, hydrogen is introduced into the cathode side, back pressure is applied to a cathode opening, meanwhile, inert gas is introduced into the anode side, an anode product channel is continuously purged, and the hydrogen permeation flux N2 under the hydrogen introduction working condition is calculated; gradually adjusting the back pressure under the hydrogen feeding working condition, repeating the step of testing the permeation flux under the hydrogen feeding working condition to obtain the hydrogen permeation flux under different back pressures, and drawing an N2-P2 curve; and determining a corresponding hydrogen back pressure value P2 when N1 is equal to N2, and calculating according to a formula deltaP = P2-P1 to obtain the average hydrogen pressure deltaP.

The utility model relates to the field of electrolyzed water, and provides a catalyst coated membrane structure, a membrane electrode and a device for producing hydrogen by electrolyzing water, the catalyst coated membrane structure comprises a proton exchange membrane, a cathode catalyst layer and an anode catalyst layer, the cathode catalyst layer and the anode catalyst layer are respectively arranged on two sides of the proton exchange membrane, and the anode catalyst layer is arranged on the proton exchange membrane. And a hydrophobic hydrogen-resistant layer is arranged between the proton exchange membrane and the cathode catalyst layer. The method has the advantages that the hydrogen transmittance is reduced, so that the concentration of hydrogen in anode side oxygen is reduced, the explosion risk is reduced, and the safety coefficient during operation of the electrolytic cell is improved. In addition, expensive metal and metal oxide catalysts are not used in the scheme, so that the cost of the catalyst coating film is reduced while the hydrogen resistance effect is achieved. And when the hydrogen passing ability is reduced, normal proceeding of other mass transfer is guaranteed, the water electrolysis hydrogen production device still has high performance under the condition that the hydrogen content in the anode side oxygen is low, and the safety of an electrolytic cell during operation is improved.

The presently disclosed methods provide for preparing a stable hydrophobic self-assembled monolayer (SAM) coating, that includes preparing a SAM solution by combining a SAM compound with an initial solvent and an additional solvent and mixing, in a sealed container, the SAM solution at a first fixed temperature at a constant rotational speed for a first fixed time interval. The SAM coating is then prepared by treating a substrate to achieve pristine state, and heating the substrate at a second fixed temperature for a second fixed time interval. Then within a sealed container, immersing the substrate in the SAM solution for a third fixed time interval. Following the completion of the third fixed time interval, the substrate is removed from the sealed container and treated with the initial solvent and the additional solvent to remove excess SAM material, and heated at a third fixed temperature.

The invention provides a hydrogen-containing normal saline high-tightness vacuum hydrogen locking packaging preparation method, which belongs to the technical field of medical liquid packaging, and comprises the following steps: pressurizing prepared hydrogen by using a hydrogen booster pump so as to store high-pressure hydrogen; high-pressure hydrogen is rapidly filled into the high-pressure pressure tank to permeate into the single bottle of normal saline, the residual hydrogen is recycled for cyclic utilization, bottled hydrogen-containing normal saline is obtained and put into a composite aluminum foil bag to be subjected to vacuumizing treatment and heat sealing treatment, a high-sealing-performance vacuum hydrogen locking aluminum foil bag packaging piece is obtained, and a finished product is detected. And quickly freezing qualified products, and refrigerating and storing the qualified products to complete hydrogen locking preparation. High-pressure hydrogen permeates into a single bottle of normal saline, the traditional hydrogen permeation period of several hours is shortened to dozens of seconds, the composite aluminum foil bag is vacuumized and subjected to heat sealing treatment, hydrogen escape is effectively inhibited, the quality guarantee effect is remarkable, the process operation is simple, the hydrogen is recycled, the cost is saved, and the method is suitable for mass production.

The application discloses a modified nitrile rubber sealing material resistant to hydrogen permeation damage and a preparation method, and belongs to the field of high polymer rubber sealing materials.The material comprises, in terms of weight parts, nitrile rubber 100 parts, composite nylon 20-35 parts, exfoliated organic montmorillonite 5-15 parts, nano hydrogen-resistant filler 3-8 parts and the like.By introducing the composite nylon as an "inlaid frame", cooperating with the "labyrinth" barrier effect of the exfoliated montmorillonite and the adsorption / quenching effect of the nano filler, a "lamellar barrier-interface anchoring" trinity protection network is constructed, hydrogen permeation and damage are inhibited from the dual mechanisms of physical barrier and chemical adsorption.The preparation adopts a two-stage low-temperature mixing process, the nylon is first blended with the rubber at low temperature, and then the remaining fillers are added at high temperature to ensure dispersion.The material prepared by the method has low hydrogen permeation rate and excellent mechanical properties, and is suitable for sealing elements of hydrogen conveying pipelines.

The invention relates to the technical field of solar heat utilization, and discloses a solar methanol reforming and hydrogen separation integrated spiral hydrogen production system which comprises a reaction tube, a spiral hydrogen selective permeable membrane, a feeding system, a sweeping pipeline and the like. The temperature and flow of the feeding system and the sweeping system can be adjusted in real time according to the solar irradiation change, the reaction tube outlet exhaust temperature, the hydrogen yield and the catalyst bed temperature, optimal energy flow matching is achieved, and the energy utilization rate of the system is increased. Meanwhile, by adopting the reaction area and the sweeping area which are designed spirally, on one hand, the temperature uniformity of a reaction tube catalyst bed can be improved, and the sintering risk of a catalyst is reduced; on the other hand, by means of the rotational flow effect of the spiral structure, the hydrogen concentration polarization phenomenon can be effectively relieved, the hydrogen permeation amount is increased while hydrogen in-situ separation is achieved, and the pure hydrogen yield of the system is increased. The device has the characteristics of wide working condition application range, high methanol conversion rate, low hydrogen separation cost, compact structure and the like.

The invention provides a high-temperature rotational molding controlled-release cross-linked composition as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The high-temperature rotational molding controllable slow-release cross-linked composition disclosed by the invention is prepared from the following components in parts by weight: 100 parts of high-density polyethylene resin, 0.05 to 0.5 part of free radical slow-release initiator, 0.05 to 2 parts of allyl assistant cross-linking agent, 0.05 to 0.2 part of main antioxidant and 0.1 to 0.5 part of auxiliary antioxidant. Through a two-stage rotational molding process, crosslinking is slowly released and controllably initiated at a high temperature, so that the influence on a high-density polyethylene crystalline region is reduced while the ESCR performance is greatly improved, and relatively low hydrogen permeability is kept. The high-temperature rotational molding controllable slow-release cross-linked composition can be applied to a compressed hydrogen plastic inner container for a vehicle.

The utility model relates to the technical field of hydrogen energy storage, and discloses a hydrogen storage bottle for hydrogen energy, which comprises a base, a bottle body and the like. The bottle body is of a multi-layer composite structure and comprises an inner container layer, a buffer layer and a shell layer, a first bottle mouth and a second bottle mouth are arranged at an upper-end bottle opening, a pressure sensor, a temperature sensor and a hydrogen leakage sensor are installed inside and at the joint respectively, and a fireproof heat insulation layer is sleeved on the outer side. The multi-layer structure has the advantages that in the multi-layer structure, the inner container prevents hydrogen permeation, the buffer layer absorbs energy, the shell provides high-strength protection, and the impact resistance and the safety performance are improved; the manual valve and the automatic valve are arranged, so that hydrogen storage safety is guaranteed; the pressure, temperature and leakage conditions in the bottle can be comprehensively monitored in real time, and abnormity disposal is facilitated; the bottle is protected when the fireproof heat insulation layer has an accident, and the safety of the hydrogen storage bottle in different environments is enhanced by a reliable protection structure.

The invention belongs to the technical field of hydrogen energy resources, and particularly relates to an oxide composite coating as well as a preparation method and application thereof. The oxide composite coating provided by the invention comprises a chromium layer, a chromium / chromium oxide composite layer, a chromium oxide layer, a chromium oxide / aluminum oxide composite layer, an aluminum oxide layer, an aluminum oxide / erbium oxide composite layer and an erbium oxide layer which are sequentially stacked, the mass percentage content of chromium in the chromium / chromium oxide composite layer is reduced in a gradient manner; the mass percentage content of chromium oxide in the chromium oxide / aluminum oxide composite layer is reduced in a gradient manner; the mass percentage content of aluminum oxide in the aluminum oxide / erbium oxide composite layer is reduced in a gradient manner. A composite transition layer with gradient composition change is introduced into the interface of the substrate / oxide layer and the interface of the oxide layer / oxide layer, so that the obvious interface is eliminated, and the interlayer bonding force is greatly improved. Chromium oxide, aluminum oxide and erbium oxide are all excellent hydrogen barrier materials, the multilayer structure and the interface thereof can effectively prolong the permeation path of hydrogen, and the hydrogen permeation barrier coefficient is improved.

The application relates to the technical field of pipeline production, and discloses a composite steel plate and a preparation method thereof, a composite steel pipe and application. The composite steel plate comprises a hydrogen permeation resistance layer and a reinforcing layer arranged on one side of the hydrogen permeation resistance layer; the material of the hydrogen permeation resistance layer and the reinforcing layer is pipeline steel, and the ratio of the yield strength of the hydrogen permeation resistance layer to the yield strength of the reinforcing layer is 1:(1.5-1.7). On this basis, the composite steel pipe is prepared through forming and welding of the composite steel plate. The composite steel pipe provided by the application adopts the composite steel plate obtained by composite rolling of specific low-grade pipeline steel and high-grade pipeline steel as pipe-making material, can well balance the hydrogen embrittlement resistance and the pipeline strength, and meets the application needs of large air volume, high efficiency and long-distance transportation of hydrogen energy.

The invention provides a numerical simulation method for hydrogen permeation of a defective pipeline influenced by corrosion of sulfate reducing bacteria. Comprising the following steps: (1) determining hydrogen permeation key parameters of a pipeline in a sulfate reducing bacteria corrosion environment through a sulfate reducing bacteria corrosion simulation experiment; and (2) constructing a multi-physics field coupling model by utilizing a finite element method, and realizing the numerical simulation of the hydrogen concentration distribution of the defective pipeline under the corrosion influence of the sulfate reducing bacteria through coupling of an electrochemical physics field and a substance transfer physics field. And (3) outputting a hydrogen concentration distribution result of the defect-containing pipeline, and revealing an influence rule of corrosion of the sulfate reducing bacteria on the hydrogen concentration distribution. According to the method, the technical blank of hydrogen permeation numerical simulation of the defect-containing pipeline in a sulfate reducing bacteria corrosion scene is filled, and theoretical support is provided for hydrogen damage evaluation, safety design and protection of the defect-containing pipeline.

This invention discloses a system and method for monitoring the hydrogen damage state of metals, comprising: a hydrogen charging device for electrochemically charging a plate-shaped sample of the same metal as the target metal that has not undergone hydrogen damage; a hydrogen permeation measuring device for converting hydrogen atoms permeating into the sample into hydrogen ions during the hydrogen charging process and measuring the current generated by the free electrons produced during the conversion process in real time to obtain a hydrogen permeation curve; and an ultrasonic measuring device for emitting ultrasonic guided waves to the sample during the hydrogen charging process and receiving the nonlinear response signal generated by the guided waves exciting ultrasonic waves inside the sample, and then performing cepstral analysis on the received signal to obtain the nonlinear coefficients at different time periods. Based on this, combined with the hydrogen permeation curve, the correlation between the nonlinear response signal and the degree of hydrogen damage is determined, and then the nonlinear response signal of the target metal is substituted into the correlation to obtain the hydrogen damage state inside the metal. This invention can monitor and evaluate the degree of hydrogen damage inside metals in real time.

The invention discloses a method and system for evaluating the influence of hydrogen content on the fracture performance of a metal material under the stress-strain synergistic effect, and the method comprises the following steps: (1) carrying out a hydrogen diffusion and mechanical property coupling experiment, and carrying out an in-situ tensile hydrogen permeation experiment and a compact tensile experiment, and respectively obtaining a rule of hydrogen diffusion parameter co-evolution along with stress-strain and fracture toughness data in different hydrogen-stress-strain coupling states. (2) establishing and verifying a multi-physics field coupling numerical model, constructing a hydrogen diffusion-mechanical coupling model based on a stress driven diffusion and strain proliferation trap theory, and establishing a quantitative correlation function of stress-strain-hydrogen concentration-hydrogen induced crack initiation J integral through experimental data calibration; and (3) carrying out safety assessment on the defective pipeline, establishing an actual pipeline defect model, calculating J integral at the defect and predicted crack initiation J integral of the metal material under the working condition, and carrying out quantitative risk grading by defining a safety margin coefficient, so as to realize early warning and management and control of the hydrogen induced cracking risk.

The utility model discloses a kind of high-pressure hydrogen storage container inner wall hydrogen barrier structure, including high-pressure hydrogen storage container, the high-pressure hydrogen storage container inner wall surface is sandblasted or inner grinding treatment, form the base of roughness Ra0.8-1.6 μm, nano-porous FeF2 transition layer, CrF3 main anticorrosion layer and TaF5 / NiF2 lubricating layer are sequentially arranged on the base.The utility model is without corrosion crack after 72 hours hydrogen permeation test, corrosion rate is reduced to 0.01mm / a below;Substrate tensile strength retention rate is ≥95%;Fluoride film layer life is more than 3 times higher than traditional plating layer.

The invention belongs to the technical field of composite coatings. The invention provides a preparation method of a hydrogen permeation resistant composite coating on the surface of a 316L stainless steel substrate. The preparation method comprises the following steps: pretreating the 316L stainless steel substrate; the preparation method comprises the following steps: mixing La2O3, Al2O3 and TiO2 according to a mass ratio, and then carrying out ball-milling refining and sieving; mixing an inorganic silicon adhesive, mixed oxide nano powder and water according to a mass ratio to prepare coating slurry; coating the surface of a substrate with the coating slurry to form a wet film; and the coated matrix is dried and then subjected to segmented heating sintering. The coating prepared by the invention can be used as a hydrogen-resistant permeation layer of a surface device with a complex shape, especially for the inner wall of a small-caliber long pipeline; the thermal expansion coefficient of the coating can be well matched with that of a 316L matrix, and the coating has good binding force; the surface of the coating is compact and uniform and has no defects such as microcracks.

This invention relates to a temperature-controlled stress electrochemical metal hydrogen permeation testing device and method. The testing device includes a hydrogen permeation electrolytic cell, a hydrogen efflux electrolytic cell, a first temperature control mechanism, a second temperature control mechanism, a tensile testing machine, a potentiostat, an auxiliary electrode, a reference electrode, and a working electrode. The hydrogen permeation electrolytic cell is equipped with a first temperature control mechanism for controlling the temperature of the hydrogen permeation electrolytic cell, and the hydrogen efflux electrolytic cell is equipped with a second temperature control mechanism for controlling the temperature of the hydrogen efflux electrolytic cell. The sidewalls of the hydrogen permeation electrolytic cell and the hydrogen efflux electrolytic cell are respectively provided with a first connecting pipe and a second connecting pipe. Both the hydrogen permeation electrolytic cell and the hydrogen efflux electrolytic cell are equipped with an auxiliary electrode and a reference electrode. The two ends of the working electrode are respectively connected to the tensile testing machine. The working electrode, the reference electrode, and the auxiliary electrode are respectively connected to the potentiostat. A sample is welded onto the working electrode. The hydrogen-filled surface and the hydrogen-effluxed surface of the sample are sealed to the first connecting pipe and the second connecting pipe through sealing gaskets.

The invention relates to the field of hydrogen energy separation and purification, in particular to a V90Ni10 alloy hydrogen separation membrane and a preparation method and application thereof. The alloy comprises, by atomic percent, 87-90 at% of V, 10-13 at% of Ni and less than or equal to 0.5 at% of impurities, and the whole alloy is of a single-phase body-centered cubic BCC-(V) solid solution structure. The Ni element forms a uniform replacement solid solution in a V matrix, and hydrogen solubility is reduced through lattice distortion and an electronic structure regulation effect, so that hydrogen embrittlement is effectively inhibited. The alloy film has no hydrogen embrittlement failure within the range of 523-673 K, the hydrogen permeability reaches 2.4 * 10 <-9 > mol m <-1 > s <-1 > Pa <-0.5 > or above at 623 K, and meanwhile, the alloy film has good mechanical properties and corrosion resistance. The invention further provides a preparation method comprising vacuum arc melting and Pd catalyst layer deposition. The material has high hydrogen permeability, excellent hydrogen brittleness resistance and low cost, and can be used for separation and purification of industrial high-purity hydrogen.

The invention discloses a low-hydrogen-permeation super-tough PA6-based material as well as a preparation method and application thereof, and belongs to the technical field of hydrogen storage materials. The low-hydrogen-permeation super-tough ternary PA6-based material disclosed by the invention is prepared from 60 to 85 percent of PA6 resin, 10 to 30 percent of maleic anhydride grafted polymer, 4 to 15 percent of ethylene-vinyl alcohol copolymer, 0.1 to 0.7 percent of lubricant and 0.2 to 0.8 percent of antioxidant. The low-hydrogen-permeation super-tough quaternary PA6-based material disclosed by the invention is prepared from 60 to 84 percent of PA6 resin, 10 to 30 percent of maleic anhydride grafted polymer, 4 to 12 percent of ethylene-vinyl alcohol copolymer, 1 to 5 percent of organic modified montmorillonite, 0.1 to 0.7 percent of lubricant and 0.2 to 0.8 percent of antioxidant. The low-hydrogen-permeation super-tough PA6 material provided by the invention has excellent normal-temperature and low-temperature impact toughness, excellent hydrogen barrier property, low moisture absorption rate and good dimensional stability, the preparation process is simple, and the cost is relatively low.

The present application belongs to the technical field of hydrogen barrier coating, and particularly relates to a hydrogen barrier coating, a preparation method and application thereof. The hydrogen barrier coating comprises an alpha-Al-based solid solution layer above a substrate, Al2O3 micro-nano particles and SiO2 micro-nano particles dispersedly distributed in the alpha-Al-based solid solution layer, and an Al2O3 film layer covering the surface of the alpha-Al-based solid solution layer. The dense structure of the alpha-Al-based solid solution itself can block hydrogen atom penetration, enhance the interface between the phase particles and the substrate, prolong the diffusion path of hydrogen atoms in the material, increase the diffusion barrier, act as a hydrogen trapping trap, and the composite coating has the dual effects of hydrogen trapping and hydrogen blocking, thereby further reducing the hydrogen permeation rate. When the coating is slightly damaged, the surface after the damage is re-oxidized to form Al2O3, and has self-repairing capability. The composite coating is prepared by a brazing coating method, and has the advantages of simple preparation method, low cost, and industrialized batch production.

The application discloses a material high-temperature hydrogen permeation simulation experiment device and experiment method based on a counter diffusion flame burner. Fuel enters a fuel cavity with horizontal initial momentum, is discharged after the initial momentum is weakened, and oxidant is vertically discharged with an initial speed and is distributed above the fuel gas flow, so that the fuel and the oxidant form a speed difference, the oxidant can form an entrainment effect on the fuel, the mixing of the oxidant and the fuel is promoted, the stability and heat release efficiency of the counter diffusion flame are improved, sufficient combustion and uniformity of flame temperature distribution are ensured, efficient and uniform mixing can be realized without a swirl generator, the structure of the counter diffusion flame burner is simplified, the equivalence ratio of the oxidant and the fuel can be adjusted by a data acquisition and control system to adjust the combustion state of the flame, so that the flame height, the temperature and the active free radical concentration are accurately controlled, the application scene of a sample is effectively simulated, various flame environments can be provided for performance experiments of the sample, and the experimental reliability is improved.

The present application relates to the technical field of methanol synthesis process, in particular to a kind of methanol synthesis fresh gas hydrogen carbon ratio adjusting system and method, wherein, system includes hydrogen carbon ratio detection device, membrane separation unit, secondary hydrogen extraction device and membrane pressure difference adjusting device;Hydrogen carbon ratio detection device is arranged on the fresh gas inlet pipeline of methanol synthesis unit, and hydrogen carbon ratio detection device detects fresh gas hydrogen carbon ratio;The gas inlet of membrane separation unit is communicated with the vent gas outlet of methanol synthesis unit by vent gas discharge pipeline;The permeation gas outlet of membrane separation unit is communicated with the gas inlet of methanol synthesis unit by hydrogen backflow pipeline;The transmembrane pressure difference of membrane separation unit is adjusted by membrane pressure difference adjusting device to control the flow of hydrogen permeation gas, so that hydrogen component in methanol synthesis unit vent gas is compensated in situ, during the component adjustment lag window in front section (purification workshop), fresh gas hydrogen carbon ratio 2.05~2.15 is maintained, and the problem of hydrogen compensation lag is solved.

The invention belongs to the technical field of metal corrosion protection, and discloses a hydrogen-microorganism synergistic corrosion protection coating as well as a preparation method and application thereof. The coating comprises the following components in parts by weight: 100 parts of epoxy resin, 18-22 parts of liquid polysulfide rubber, 5-7 parts of palladium modified hexagonal boron nitride nanosheets, 6-10 parts of [P4444] [Gly] coated SiO2 microcapsules, 2-4 parts of a silane coupling agent and 35-45 parts of an amine curing agent. The coating can efficiently block hydrogen permeation and inhibit microbial corrosion for a long time at the same time.

The invention discloses an fct-phase NiAg nano-particle catalyst as well as a preparation method and application of the fct-phase NiAg nano-particle catalyst. The fct-phase NiAg nanoparticle catalyst is of a core-shell structure and comprises a bimetallic core containing Ni and Ag and a nitrogen-doped carbon layer coating the surface of the bimetallic core, and the crystal phase of fct-phase NiAg nanoparticles is a metastable-state fct phase. The catalyst provided by the invention overcomes the synthesis bottleneck of a NiAg immiscible system, realizes anti-sintering and structure locking at high temperature, can construct an efficient transmission network of electrons and hydrogen when being applied to the field of magnesium hydride, establishes dual channels of electron conduction and rapid hydrogen permeation on the surface of magnesium hydride, and has a good application prospect in the field of magnesium hydride. And the unification of rapid dynamics and long cycle stability is realized.

The invention discloses a preparation method of a binary V-based alloy and application of the binary V-based alloy in hydrogen permeation, and relates to development and preparation of a novel binary alloy material for hydrogen permeation, and the component of the alloy is V90Al10. The preparation method of the alloy comprises the following steps: firstly, cleaning the raw materials V and Al, and then accurately weighing the raw materials; and then smelting in a vacuum glove box electric arc smelting furnace for multiple times to ensure uniform distribution of alloy components. The prepared material has good hydrogen permeation performance, hydrogen embrittlement resistance and corrosion resistance, and has a good application prospect.

The invention discloses a graphite phase carbon nitride and nickel-based layered double-metal hydroxide composite film and a preparation method and application thereof, the composite film is prepared by growing nickel-based layered double-metal hydroxide on the surface of a graphite phase carbon nitride nanosheet in situ, constructing to obtain a composite nanosheet, and then assembling the composite nanosheet to form the composite film. By adopting an in-situ growth compounding strategy, uniform compounding of two components of graphite phase carbon nitride and nickel-based layered double hydroxides can be realized, and a firm interface bonding effect is formed, so that the microstructure of the composite membrane is effectively regulated and controlled, and the composite membrane has relatively high hydrogen permeation flux and hydrogen / carbon dioxide separation selectivity at the same time; the prepared composite membrane is good in separation performance, stable in operation and suitable for separating and purifying hydrogen from mixed gas containing carbon dioxide.

The invention discloses a flexible hydrogen leakage sensing patch and a preparation method thereof, and a hydrogen leakage monitoring system. The patch comprises a flexible substrate; the functional layer comprises a conductive metal film layer arranged on the top surface of the flexible substrate and a nanowire array arranged on the top surface of the conductive metal film layer; the functional layer is stripped from the rigid substrate and transferred to the flexible substrate; the electrode layer is arranged on the top surface of the nanowire array and is used for forming an electric signal leading-out end; and the packaging layer covers the electrode layer and the nanowire array, and a hydrogen permeation window for introducing hydrogen into the nanowire array is formed in the packaging layer. The hydrogen leakage sensing patch based on the flexible substrate can be directly attached to a complex curved surface and has the excellent conformal attaching characteristic, the functional layer is stripped from the rigid substrate and transferred to the flexible substrate, the problems that the flexible substrate cannot adapt to high temperature and the surface roughness of the flexible substrate are solved through the transfer technology, and the hydrogen leakage sensing patch is high in sensitivity and high in reliability. And high quality and consistency of the nanowire array are ensured.