40 results about "Hydrogen analysis" patented technology

The invention discloses a hydrogen evolution electrode for an AEM electrolytic cell cathode and a preparation method thereof, the electrode sequentially comprises a substrate net, a metal bottom layer and a catalyst layer, the substrate net is selected from a stainless steel net or a nickel net, the metal bottom layer is formed on the substrate net through physical vapor deposition, and the material is selected from Ni, Ti, alloys thereof or oxides thereof; the catalytic layer is deposited on the metal bottom layer through physical vapor deposition and sequentially comprises a catalytic bottom layer, a catalytic middle layer and a catalytic outer layer, and the porosity is gradually increased. The preparation method comprises the following steps: roughening the acid etching surface of a substrate net, forming a metal bottom layer on the substrate net through physical vapor deposition, sequentially forming a catalytic bottom layer, a catalytic middle layer and a catalytic outer layer on the surface of the metal bottom layer through physical vapor deposition to obtain a catalytic layer, and performing post-treatment on the catalytic layer through plasmas doped with elements to form a porous network structure. And the corrosion resistance and the catalytic effect of the AEM electrolytic cell cathode in an alkaline environment are greatly improved.

The invention belongs to the technical field of electro-catalysis full water splitting, and discloses a nickel-based self-supporting hydrogen evolution electrode and a preparation method and application thereof.The preparation method comprises the steps that nickel chloride hexahydrate and terephthalic acid are dissolved in N, N-dimethylformamide, the concentration of the nickel chloride hexahydrate is controlled to be 0.1-0.15 mol / L, the concentration of the terephthalic acid is controlled to be 0.1-0.15 mol / L, the nickel chloride hexahydrate and the terephthalic acid are stirred to be uniform, ultrasonic treatment is conducted, and an electrolyte is obtained; the pretreated foamed nickel is immersed in the electrolyte to serve as a working electrode, a platinum net serves as a counter electrode, an Ag / AgCl electrode is adopted as a reference electrode, current of-10 mA to-20 mA is applied for deposition for 1.5-2.5 h, and the nickel-based self-supporting hydrogen evolution electrode is obtained after electro-deposition and cleaning and drying are conducted. The nickel-based self-supporting catalytic material prepared by the invention fully exposes active sites, has high catalytic performance, has a good application prospect in the technical field of electro-catalytic materials, and is expected to improve energy and environment problems.

The invention discloses a preparation method of a noble metal doped ultrathin hydroxide nano-cluster type electro-catalytic material, and relates to a preparation method of a noble metal doped hydroxide electro-catalytic material. The invention aims to solve the technical problems of high cost, complex preparation process and no environmental protection of the existing electro-catalytic material. The method comprises the following steps: putting foamed nickel into a mixed solution of persulfate and transition metal salt for hydrothermal reaction to obtain an intermediate; and putting the intermediate into a noble metal salt solution for hydrothermal reaction to obtain the noble metal doped ultrathin hydroxide nano-cluster type electro-catalytic material. The prepared material has an ultrathin nano-cluster structure, and is high in electron transmission rate and hydrogen evolution reaction rate. In a 1M KOH aqueous solution, the overpotential is 68-98mV under 10mA. Cm <-2 >, the Tafel slope is 96.8-112.3 mV dec <-1 >, and the composite material can be used in the field of hydrogen production by electrolyzing water.

The invention discloses a carbon-doped non-noble metal high-entropy alloy hydrogen evolution catalytic electrode and a preparation method thereof, and belongs to the technical field of water electrolysis hydrogen production. The preparation method comprises the following steps: (1) blending four metal powder of Fe, Co, Ni and Mo with carbon powder, ball-milling, standing and passivating to obtain mixed powder; and (2) carrying out compression molding on the mixed powder obtained in the step (1), and sintering. The preparation method is simple in process, the hydrogen evolution catalytic electrode can be obtained only through two steps of mechanical alloying and pressureless sintering, operation is easy and convenient, large-scale preparation can be achieved, and industrialization is easy; through a carbon doping mode, a transition metal carbide-molybdenum carbide and quaternary high-entropy alloy synergistic effect is formed in the electrode material, the free energy of a hydrogen intermediate is obviously reduced, the mass transfer process in electrochemical reaction is facilitated, and the electrode material has excellent hydrogen evolution catalytic performance and is suitable for water electrolysis hydrogen evolution catalytic reaction in an alkaline environment; the hydrogen production efficiency can be improved, and the energy consumption is reduced.

The invention discloses a carbon-nitrogen packaged nickel-based binary metal hydrogen evolution catalyst, a preparation method and application, a nickel source, a molybdenum source and foamed nickel are subjected to a hydrothermal reaction, then landfill is carried out through CH4N2O, calcination is carried out at a high temperature in a nitrogen atmosphere, and the carbon-nitrogen packaged nickel-based binary metal hydrogen evolution catalyst is prepared. According to the method, 1 mol / L of KOH is used as an electrolyte, a graphite rod is used as a counter electrode, a reference electrode is Hg / HgO, the carbon-nitrogen packaged nickel-based binary metal hydrogen evolution catalyst is tested, the overpotential is only 44 mV under the current density of 10 mA / cm < 2 > through testing, the catalyst is still excellent in performance under the high current density, and data shows that the overpotential can still be kept within 125 mV under the current density of 100 mA / cm < 2 >.

The invention discloses an aqueous zinc ion battery electrolyte additive capable of forming an organic / inorganic hybrid SEI membrane and an electrolyte. The additive contains pyridine rings, fluorine atoms and aldehyde groups. The additive can be adsorbed on the surface of zinc, can be spontaneously decomposed in the charging and discharging process, and can form a gradient organic / inorganic hybrid SEI film layer together with an electrolyte, an outer-layer SEI film component is mainly an organic component, an inner-layer SEI film component is mainly an inorganic component, the SEI film layer can isolate direct contact between zinc and water, the hydrogen evolution process is inhibited, and the service life of the SEI film layer is prolonged. Meanwhile, transmission of zinc ions is promoted. According to the additive, dendrite-free growth and side reaction inhibition of the zinc negative electrode are realized, and the cycle life of the battery is prolonged.

The invention belongs to the technical field of energy storage materials, and relates to a zinc-loving hydrophobic interface modification layer of a zinc metal negative electrode, a preparation method and application, the interface modification layer is an M-XF nanometer layer constructed on the surface of the zinc negative electrode, M is zinc-loving metal nanometer particles having solid solubility with zinc metal, and XF is fluoride nanometer particles having hydrophobicity; during preparation, zinc-loving metal M and hydrophobic fluoride XF are co-sputtered and deposited on metal zinc through radio frequency magnetron sputtering, and target materials during sputtering are zinc-loving metal M and fluoride XF target materials; the zinc-loving hydrophobic interface modification layer can be used for preparing an aqueous zinc ion battery; the metal M in the modified layer homogenizes the current density distribution on the surface of the zinc negative electrode to form a dendrite-free negative electrode / electrolyte interface; the XF nanoparticles isolate the zinc metal negative electrode and free water molecules, so that a hydrogen evolution side reaction and a self-corrosion side reaction are inhibited; the zinc-hydrophilic and hydrophobic bifunctional interface modification layer induces uniform zinc deposition, and side reactions such as hydrogen evolution on the surface of the electrode are inhibited.

The invention discloses a preparation method and application of a pine needle nanosheet composite copper-cobalt alloy phosphide hydrogen evolution catalyst, and relates to the technical field of electro-catalysis. The copper-cobalt alloy phosphide hydrogen evolution catalyst is obtained by adopting electrolyte containing a copper source, a cobalt source, a phosphorus source and an inorganic fluoride complexing agent, taking foamed nickel as a working electrode and carrying out electro-deposition by utilizing a constant voltage method. On the basis of low cost and a simple synthesis method, the electronic structure of the catalyst is adjusted, and the electron transfer efficiency and the stability of active sites are improved, so that an excellent water electrolysis hydrogen evolution effect is realized, and a new solution is provided for the development of the field of clean energy.

The utility model discloses a sample cutting platform for processing oxygen, nitrogen and hydrogen analysis samples, relates to the field of detection devices, and specifically comprises a first supporting frame, a second supporting frame fixedly arranged at the top of the first supporting frame, an n-shaped component for fixing a handle of a sample cutting forceps, and an adjusting nut adaptively connected to the n-shaped component, the bottom ends of four second supporting rods are fixed on the top surface of the first rectangular frame; the length dimension of the second rectangular frame is smaller than the length dimension of the first rectangular frame, two n-shaped components are respectively installed on two opposite sides of the first rectangular frame, two threaded ends of the n-shaped components pass through the first rectangular frame and are connected with the adjusting nut, the two n-shaped components can also be installed on the second rectangular frame, the n-shaped component can fix the handle of the sample cutting forceps, and the operation is convenient, the first rectangular frame and the second rectangular frame form two planes with a height difference, both of which are used to install the sample cutting forceps, and are suitable for people of different heights to perform sample cutting operations.

The invention discloses a preparation method and application of a polypyrrole-derived porous carbon material, and relates to a preparation method and application of a porous carbon material. The invention aims to solve the problems of short circuit and short service life of the battery caused by dendritic crystal growth, corrosion and hydrogen evolution of the current aqueous zinc ion battery in practical application. According to the invention, pyrrole is used as a precursor, and the porous carbon material is prepared through potassium permanganate etching; the porous carbon material has a nitrogen-doped structure with enriched pyridine nitrogen and a large number of defects; by controlling the etching time, the nitrogen doping type and the defect content can be accurately adjusted; wherein the doped nitrogen element contains pyridine nitrogen and pyrrole nitrogen structures with zinc affinity, so that zinc ions can be effectively enriched. The prepared zinc negative electrode with the porous carbon coating on the surface has the advantages of being long in cycle life and good in stability, the coating preparation process is simple, and the zinc negative electrode has industrialization prospects.

The hydrogen evolution electrode comprises a nickel net substrate, a transition layer located on the surface of the nickel net substrate and a porous catalyst layer located on the surface of the transition layer, and the contact face of the transition layer and the porous catalyst layer is of a micropore structure. Wherein the average thickness of the transition layer is 5-15 microns; and the average thickness of the porous catalyst layer is 0.1-10 [mu] m. The porous catalyst layer at the outermost layer can provide enough active sites for hydrogen evolution reaction, and the transition layer positioned between the nickel net substrate and the porous catalyst layer can reduce stress between metal materials, so that the combination effect of active substances and the nickel net substrate is improved, and the hydrogen evolution reaction efficiency is improved. And the pore structure gradually enlarged from the inner transition layer to the outer catalyst layer is beneficial to removal of hydrogen bubbles generated in the electrolysis process. The hydrogen evolution electrode with the designed structure has very high electrochemical hydrogen evolution performance, the structural stability of the electrode can still be kept after the electrode works for a long time, and the service life of the electrode is effectively prolonged.

The invention relates to an R-STO photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. Cubic-phase SrTiO3 nanoparticles are synthesized by adopting a high-temperature molten salt medium, reduced graphene oxide attached to the surface of SrTiO3 is reduced by using ascorbic acid to obtain RGO / SrTiO3 nanoparticles, and then a final product named R-STO photocatalyst is obtained by using a photodeposition method and can be applied to the field of photocatalytic full water splitting. Compared with an existing photocatalyst, the R-STO photocatalyst is good in controllability and high in stability, the cubic-phase SrTiO3 nanoparticles with the special morphology can effectively inhibit photogenerated electrons and hole recombination, the separation efficiency of carriers is further improved, and synchronous water decomposition, hydrogen evolution and oxygen production can be achieved. The method is green and environment-friendly, simple, convenient to operate and low in material preparation cost, conforms to the green and environment-friendly concept advocated at present, and has a wide application market prospect.

This invention relates to the field of big data analytics, specifically to a big data-based residual oil hydrotreating analysis system, comprising a data acquisition module, a path identification module, a disturbance confirmation module, an efficiency evaluation module, and a section output module. In this invention, multi-source dynamic data from the residual oil hydrotreating process is synchronized in time and reconstructed periodically. Path deviation behavior is screened based on dual thresholds for the direction and magnitude of feed rate changes. Disturbance trends are classified and identified by combining rate difference gradients. Furthermore, the directional matching relationship between aromatic concentration and hydrotreating efficiency is correlated, constructing a coupling response labeling mechanism among multi-source indicators. This enables dynamic tracking of the intrinsic causal relationship between feed disturbances and efficiency changes, clearly distinguishing between trend fluctuations and random disturbances. High-confidence coupling identification labels are output within the overlapping intervals of multi-source data, enhancing the perception of complex changes in the reaction process and improving the real-time performance and accuracy of operational condition judgment.

The invention relates to the technical field of fuel cells and water electrolysis, in particular to a defect Ru nanocluster-oxygen coordinated Ru monatomic double-active-site porous nanosheet electrocatalyst for hydrogen hydroxide precipitation and a preparation method of the defect Ru nanocluster-oxygen coordinated Ru monatomic double-active-site porous nanosheet electrocatalyst. And preparing the defect Ru nanocluster-oxygen coordinated Ru monatomic double-active-site porous nanosheet electrocatalyst. The invention has the following advantages: in the defective Ru nanocluster-oxygen coordinated Ru monatomic double-active site porous nanosheet electrocatalyst prepared by low-temperature self-assembly, carbonization, acid pickling, wet impregnation and in-situ reduction, the defective Ru nanoclusters and oxygen coordinated Ru monatomic double-active sites are highly dispersed and adjacent to each other; in addition, the electrocatalyst has a large specific surface area and high porosity, and utilization of active sites is facilitated. The electrocatalyst has very high electrocatalytic activity, and is suitable for a hydroxide reaction of a hydroxyl exchange membrane fuel cell anode and a hydrogen evolution reaction of an electrolyzed water cathode.

The invention discloses a transition metal-based composite electrode for hydrogen production by alkaline electrolysis of water and a preparation method thereof, and the preparation method comprises the following steps: 1) uniformly dissolving a first transition metal salt and a second transition metal salt in the same organic alcohol respectively, and then mixing the two obtained salt-alcohol solutions to obtain a uniform and stable electro-deposition solution; and (2) a two-electrode system is adopted, the conductive substrate serves as a cathode, the cathode and an anode are immersed in the electrodeposition liquid for electrochemical deposition, then washing and drying are conducted, and the transition metal-based composite electrode evenly deposited with the binary alloy particle layer is obtained. According to the method, the single organic alcohol is selected as the electrode liquid solvent, and the front transition metal chlorate is selected as the solute, so that the introduction of the oxometallate is avoided, the direct conversion from the low-valence front transition metal ions to the rough alloy particle deposition layer is realized, the deposition energy consumption is effectively reduced, and the deposition efficiency is improved. And meanwhile, the catalyst has higher intrinsic hydrogen evolution activity and good mechanical strength and chemical stability, and is suitable for popularization.

The invention belongs to the technical field of photocatalytic materials, and particularly relates to a Cu-doped MnMoO4 photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: grinding copper sulfate pentahydrate into a MnMoO4 precursor, and changing the molar ratio of a copper source to obtain the MnMoO4-x% Cu composite material with different molar ratios, which can be applied to the field of hydrogen evolution by photocatalytic decomposition of water. Compared with an existing photocatalyst, the Cu-doped MnMoO4 photocatalyst has the advantages that the controllability is good when the Cu-doped MnMoO4 is used as a catalyst, the separation efficiency of current carriers is further improved, and the Cu-doped MnMoO4 photocatalyst is relatively high in hydrogen yield and relatively good in stability when being applied to photocatalytic water decomposition. The method is green and environment-friendly, simple, convenient to operate and low in material preparation cost, conforms to the green and environment-friendly concept advocated at present, and has a wide application market prospect.

An automatic control method for a hydrogen refueling station comprises the following steps: a controller enters a working state, transmits a control instruction to a multi-type sensor, and monitors a pressure parameter, a flow parameter and a temperature parameter of hydrogen of the hydrogen refueling station; the controller receives the monitored pressure parameters, flow parameters and temperature parameters, displays the parameters on a user interaction interface, and analyzes and processes the parameters in real time; manual control is carried out through a user interaction interface, hydrogenation related parameters are adjusted, data recording is carried out at the same time, and subsequent hydrogenation analysis and adjustment are facilitated; when abnormal data occurs or hydrogen leakage is monitored, the controller automatically triggers an alarm and cuts off a power supply, operation of all equipment is stopped, and meanwhile, an emergency exhaust assembly is arranged to ensure that pressure can be safely released when overpressure occurs.

The invention provides a synergistic method of an alkaline water electrolysis hydrogen evolution catalyst, and belongs to the technical field of water electrolysis hydrogen production, the method comprises the following steps: S1, selecting or preparing a certain amount of a hydrogen evolution catalyst A; s2, taking a certain amount of transition metal hydride B, and compounding the transition metal hydride B with the hydrogen evolution catalyst A in the S1 to obtain a composite material C; and S3, performing electrochemical testing on the hydrogen evolution catalyst A, the transition metal hydride B and the composite material C to obtain an electrolyzed water cathodic polarization curve. According to the method, the catalyst and the transition metal hydride are compounded, the alkaline hydrogen evolution catalytic activity can be improved, the power consumption of hydrogen production through water electrolysis is reduced, and the synergistic technology has the advantages of being low in cost, remarkable in effect and high in universality and has important application value in the field of hydrogen production through alkaline water electrolysis.

A movable phosphine hydrogen analysis and treatment device comprises a main body, a heat dissipation opening is formed in the front face of the main body, an air inlet and a charging port are formed in the right side of the main body, an air outlet is formed in the left side of the main body, corresponding strap frames are arranged on the two sides of the main body, and a display screen, indicator lamps and operation keys are arranged at the top of the main body. A protection assembly is arranged on the air inlet and comprises a fixing block, a sealing cover and an air pump, the air pump is located in the main body and communicates with the air inlet, a sensor is arranged on the left side of the air pump, a signal converter is arranged on the left side of the sensor, and a data analyzer is arranged above the signal converter; and a tail gas treatment device is arranged on the left side of the data analyzer, the tail gas treatment device communicates with the gas outlet, the gas inlet can be protected through the protection assembly when the gas inlet is not used, it is prevented that foreign matter enters the gas inlet, cleaning is difficult, meanwhile, operation of the device is affected, and the use safety of the device is improved.

The present invention provides a porous conductive ceramic membrane loaded with a photoelectric catalyst, and a preparation method and application thereof. The porous conductive ceramic membrane is prepared by phase inversion casting, and has the advantages of high strength, high stability, high porosity, high specific surface area, strong acid and alkali resistance, high conductivity, high hydrogen evolution efficiency, etc. The photoelectric catalyst is modified on the porous conductive ceramic membrane, which can be used as an important material for photolysis and electrolysis hydrogen production.

The present invention discloses a method for preparing a self-supporting hydrogen evolution reaction catalyst based on corrosion-coordination engineering. The method adopts a metal spontaneous corrosion strategy and controls the metal corrosion process by adding an appropriate amount of sodium gluconate. The sodium gluconate can compete with the chloride ions in the ruthenium chloride solution for adsorption onto the surface of the foamed iron. At the same time, the carboxyl groups in the gluconate radicals can combine and coordinate with the ruthenium ions to reduce the corrosion effect of the chloride ions and the ruthenium ions. The prepared self-supporting hydrogen evolution electrocatalyst has a high corrosion rate at 1 mol L ‑1 In KOH solution, only 90~110mV overpotential is required to reach 100mA cm ‑2 Current density, with excellent electrocatalytic hydrogen evolution performance.

The present invention relates to the technical field of electrocatalytic hydrogen evolution, and in particular to a hexagonal pentlandite, a preparation method thereof and electrocatalytic hydrogen evolution. The space group of the hexagonal pentlandite provided by the present invention is P63 / mmc; the unit cell parameters include: α=90°, β=90°, γ=120°; #imgabs0##imgabs1# The hexagonal pentlandite provided by the present invention can be used as a hydrogen evolution catalyst with good hydrogen evolution performance. As a hydrogen evolution catalyst, the hexagonal pentlandite has a particle size of 0.2 to 2 μm and an electrocatalytic hydrogen evolution performance of 10 mA cm ‑2 The overpotential is not higher than 60mV at high current density (≤205.8mA cm ‑2 ) for 50 h without any activity loss, and the hydrogen evolution performance is much higher than that of cubic pentlandite, and the hydrogen evolution performance is significantly higher than that of known nano-sulfide hydrogen evolution catalysts.

The utility model relates to a gasification furnace burner leakage analysis system, which comprises a gasification furnace and a burner, the burner is arranged on the gasification furnace, the burner is provided with a cooling water circulation system, and the cooling water circulation system comprises a gas-liquid separator with an inlet connected with the burner; the on-line hydrogen analysis sampling pipe is connected with a gas outlet of the gas-liquid separator; an inlet of the burner cooling water tank is connected with a liquid outlet of the gas-liquid separator; the overflow pipe is arranged on the side wall of the burner cooling water tank; the tail end of the overflow pipe extends below the liquid level of the liquid seal tank; the manual analysis sampling pipe is arranged on the overflow pipe; and the burner cooling water pump provides power for the cooling water circulation system. Cooling water is introduced into a gas-liquid separator, the hydrogen content of separated gas is detected, whether leakage occurs or not is judged, separated liquid enters a nozzle cooling water tank and enters a liquid seal tank through an overflow pipe, if bubbles are generated at the tail end of the overflow pipe, sampling and analysis are carried out through a manual analysis sampling pipe on the overflow pipe, and if leakage gas exists, the nozzle leaks.

The utility model discloses a thermal conductivity type hydrogen analyzer which comprises a hydrogen conveying pipeline and hydrogen analysis equipment, the hydrogen conveying pipeline is connected with a shunting pipeline penetrating through the hydrogen analysis equipment, and the hydrogen analysis equipment is internally connected with a sealed detection box; a gas inlet cavity, a stable detection cavity and a backflow cavity which are communicated with one another are sequentially formed in the sealed detection box from front to back, a top plate of the hydrogen analysis equipment is connected with a thermal conductivity type analyzer, the thermal conductivity type analyzer is connected with a sensing module extending into the stable detection cavity, and the flow dividing pipeline is connected with a gas inlet pipeline communicated with the gas inlet cavity. And the shunting pipeline is connected with a backflow pipeline communicated with the backflow cavity. Compared with the prior art, the hydrogen analysis device has the advantages that the split-flow hydrogen analysis equipment is arranged in the hydrogen conveying pipeline and is matched with a thermal conductivity type analyzer, so that the analysis accuracy can be ensured while rapid analysis is carried out.

The utility model provides a hydrocarbon analysis gasification device for an air separation unit, which comprises a main cooler, a vaporizer and a capillary tube used for connecting a to-be-detected position of the main cooler and the vaporizer, the capillary tube is spirally arranged along the vaporizer, the outlet end of the capillary tube is connected with at least two outlet pipelines, and the at least two outlet pipelines are provided with stop valves; according to the utility model, the safety and accuracy of hydrocarbon analysis of the air separation device are improved, and the gasification stability of hydrocarbon liquid oxygen is ensured.

The application discloses an automatic clamping and dumping experimental device for hydrogen permeation detection samples of enamel steel, an automatic dumping mechanism is fixedly installed on a rack, an automatic lifting clamping mechanism is fixedly arranged on a turnover bearing platform, a hydrogen analysis pool is arranged on a lifting bearing platform of the automatic lifting clamping mechanism, a hydrogen charging pool is arranged above the hydrogen analysis pool, a sample to be tested is clamped between the hydrogen charging pool and the hydrogen analysis pool through an O-shaped sealing ring, automatic clamping and sealing between the sample to be tested, the hydrogen charging pool and the hydrogen analysis pool are realized through the automatic lifting clamping mechanism; a sealing pressure sensing unit is used for detecting pressure changes when the hydrogen charging pool, the sample to be tested and the hydrogen analysis pool are moved upwards on the lifting bearing platform to realize clamping and sealing, and transmitting pressure signals to a control host; the control host is connected with the automatic lifting clamping mechanism, the automatic dumping mechanism and the sealing pressure sensing unit respectively, and is used for controlling sample clamping, sealing detection and dumping recovery processes.

The invention belongs to the technical field of electrolytic hydrogen evolution. Aiming at the problems of limited catalytic activity and low stability existing in the current NiMo alloy catalyst, the invention provides a nickel foam-supported nitrogen-phosphorus co-doped NiMo-based composite catalyst N, P-MoNi4 / Ni2Mo3O8 / Ni3Mo3C@NF and a preparation method and application thereof, which is obtained by a two-step hydrothermal method; a nitrogen-containing polymer is used as a carbon source and a nitrogen source, phosphomolybdic acid is used as a phosphorus source and a molybdenum source, and nickel foam is used as a carrier. Under hydrothermal conditions, the nitrogen-containing polymer and phosphomolybdic acid are co-modified onto a nickel foam skeleton to obtain a polyoxometalate / polymer composite supported by nickel foam; phosphomolybdic acid, nickel chloride and urea are then co-hydrothermally treated to grow nickel-molybdenum oxide nanoflowers on the polyoxometalate / polymer composite supported by nickel foam; and finally, high-temperature calcination is performed under an inert atmosphere to obtain N, P-MoNi4 / Ni2Mo3O8 / Ni3Mo3C@NF. The catalyst has hydrogen evolution performance and high stability similar to that of precious metal platinum.

The invention relates to the technical field of logging, in particular to a quantitative sample injection system and method for a petroleum logging non-hydrocarbon analyzer, and the quantitative sample injection system comprises a main box body, an air compressor, and a sample pump, a gas path control module, a carbon dioxide analysis module, a combustible gas analysis module, a hydrogen analysis module and a waste gas treatment module which are positioned in the main box body; the method comprises the following steps: (1) pipeline connection; the device is reasonable and compact in structure and ingenious in conception, and the pressure of sample gas supplied into the carbon dioxide analysis module, the combustible gas analysis module and the hydrogen analysis module is monitored in real time by arranging the first pressure sensor, the second pressure sensor and the third pressure sensor; by arranging a first pressure control valve, a second pressure control valve and a third pressure control valve, the pressure and the flow speed of sample gas supplied into the carbon dioxide analysis module, the combustible gas analysis module and the hydrogen analysis module are quantitatively adjusted, and the device has the characteristics of stability, reliability and quantification.

The utility model relates to the technical field of sample preparation equipment, in particular to a sample preparation device for hydrocarbon analysis, which can ensure the same pressure during stamping, ensure the accuracy of analysis results and facilitate subsequent use. Comprising a base, fixing holes are symmetrically formed in the left end and the right end of the bottom of the base, electric telescopic rods are installed in the fixing holes, push plates are fixedly installed at the telescopic ends of the electric telescopic rods, and two punching tables are fixedly installed at the top ends of the push plates and located in matching holes; two matching holes are formed in the left end and the right end of the top of the base, the two die holders are installed at the left end and the right end of the top of the base respectively, stamping holes matched with the matching holes are formed in the die holders, and the fixing assemblies are installed at the four corners of the bottom end of the base; the moving assembly is installed in the middle of the top end of the base, the stamping assembly is installed on the moving assembly, and the collecting assembly is installed on the die holder.

The invention relates to a water electrolysis device. The water electrolysis device comprises an oxygen evolution assembly, a hydrogen evolution assembly and a porous diaphragm arranged between the oxygen evolution assembly and the hydrogen evolution assembly; the oxygen evolution assembly comprises an anion exchange membrane, and a first hydrolysis catalyst layer and an oxygen evolution catalyst layer which are respectively loaded on two sides of the anion exchange membrane; the hydrogen evolution assembly comprises a proton exchange membrane, and a second hydrolysis catalyst layer and a hydrogen evolution catalyst layer which are respectively loaded on the two sides of the proton exchange membrane, and the first hydrolysis catalyst layer and the second hydrolysis catalyst layer are respectively arranged on the two sides of the porous diaphragm; the water electrolysis device further comprises a water tank, pure water is arranged in the water tank, and the lower end of the porous diaphragm extends into the pure water. The activation overpotential of the electrolyzed water and the content of precious metal iridium can be effectively reduced, and the ohmic resistance of the bipolar membrane electrolyzed water is reduced in a capillary liquid inlet mode; and high-efficiency and low-cost water electrolysis is realized.