138 results about "Nafion" patented technology

The invention belongs to the field of proton exchange membrane water electrolysis hydrogen production, and particularly relates to a functionalized ionic liquid modified PVDF / Nafion composite proton exchange membrane as well as a preparation method and application thereof, which are used for solving the technical problems of high cost, low mechanical strength, swelling at high temperature and low conductivity of a Nafion composite membrane. A PVDF / Nafion solution is subjected to functionalized ionic liquid modification to obtain a membrane casting solution, and then the membrane casting solution is coated and dried to obtain the functionalized ionic liquid modified PVDF / Nafion composite proton exchange membrane. According to the ionic liquid modified PVDF / Nafion composite proton exchange membrane disclosed by the invention, the usage amount of Nafion resin is reduced, the cost is reduced, and meanwhile, the proton conductivity is improved by adding the ionic liquid; the ionic liquid functionalized by different cations can form a hydrogen bond network with sulfonic acid groups of Nafion and fluorine atoms of PVDF, so that the mechanical property and the thermal stability of the proton exchange membrane are improved, and the proton exchange membrane has a good application prospect.

The invention discloses a zinc-bromine flow battery multifunctional bipolar plate and a preparation method and application thereof.The method comprises the steps that polyaniline is added into a cetyltrimethylammonium bromide ethanol solution, after stirring and ultrasonic treatment, a mixed solution is obtained and sprayed to the positive electrode side of a pretreated polypropylene bipolar plate, and after drying, the zinc-bromine flow battery multifunctional bipolar plate is obtained; the polyaniline modified polypropylene bipolar plate is obtained; the preparation method comprises the following steps: dissolving beta-cyclodextrin in a NaOH solution, adding epoxy chloropropane, stirring for reaction, washing to be neutral, drying, grinding and sieving to obtain a cyclodextrin polymer, dispersing the cyclodextrin polymer in a Nafion solution to obtain a cyclodextrin polymer solution, spraying the cyclodextrin polymer solution on the negative electrode side of a polyaniline modified polypropylene bipolar plate, and drying to obtain the multifunctional bipolar plate of the zinc-bromine flow battery. Polyaniline is loaded on the positive electrode side of the bipolar plate to reduce a bromine permeation source and bromine reaction activation energy, a cyclodextrin polymer Nafion solution is used for modifying and stabilizing the pH value of an electrolyte on the negative electrode side, uniform and compact deposition of zinc is promoted, formation of sharp dendrites is reduced, and the electrochemical performance and long-term stability of the battery are improved.

The application discloses a kind of sulfonic acid group covalent organic framework / Nafion composite material for proton conduction and preparation method and application thereof, belong to fuel cell technical field.The application first utilizes double sulfonic acid group organic aromatic amine ligand and aldehyde group ligand to construct a kind of sulfonic acid functional two-dimensional covalent organic framework material COF-(SO3H)2 by condensation reaction.COF-(SO3H)2 is compounded with Nafion polymer to prepare proton exchange membrane, and the proton exchange membrane material has excellent proton conduction, and the proton conductivity is 1.338*10 ‑1 S·cm ‑1 (80ºC).The proton exchange membrane material of the application is prepared by solvothermal process and casting method, and the preparation method is simple and easy to operate, which provides a new choice for proton conduction material in fuel cell, and expands the application value of covalent organic framework material.

The invention relates to a preparation method of a water electrolysis hydrogen production composite electrode based on a zwitterionic polymer binder. According to the method, a traditional ionic binder Nafion is replaced with a zwitterionic polymer polysulfobetaine methacrylate, an electrode-electrolyte interface is optimized through a unique electrically neutral hydration layer structure, the rapid desorption behavior of bubbles is enhanced, and efficient transmission of reaction ions is also promoted; and regulating and controlling the mass ratio of the PSBMA binder to the catalyst by using a spraying process. The invention aims to overcome the defects of high cost, insufficient mass transfer and poor interface stability of the existing Nafion binder, and provides the composite electrode taking PSBMA as the binder and the preparation method of the composite electrode, and the provided composite electrode is simple in preparation process and controllable in cost, and has good popularization and application prospects.

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 belongs to the technical field of fuel cell membrane electrode preparation, and particularly discloses a preparation method for improving fuel cell catalyst layer ionomer distribution, which comprises the following steps: placing a carbon nanotube in dilute nitric acid, carrying out uniform ultrasonic dispersion, then carrying out oil bath heating, carrying out continuous acidification treatment, then carrying out suction filtration, and drying to obtain a carbon nanotube catalyst layer; carbon nano tube powder subjected to acidizing treatment is obtained; mixing the acidized carbon nanotube powder with a Nafion solution in proportion, and removing a solvent through rotary evaporation to obtain a carbon nanotube-Nafion compound; mixing the carbon nanotube-Nafion compound with a commercial Pt / C catalyst, deionized water and ethanol in proportion, and performing ultrasonic treatment under an ice bath condition to obtain uniformly dispersed cathode catalyst slurry; and spraying the uniformly dispersed cathode catalyst slurry on the cathode side of the proton exchange membrane to obtain the catalyst layer for improving ionomer distribution.

The application discloses a kind of glucose oxidase sensors based on modified multi-walled carbon nanotube modification, it is related to glucose oxidase sensor technical field, including the following steps: (1) modified multi-walled carbon nanotube preparation;(2) glassy carbon electrode is carried out surface polishing treatment;(3) obtain modified multi-walled carbon nanotube dispersion;(4) obtain glucose oxidase liquid;(5) glucose glucose oxidase liquid impregnation electrode;(6) using Nafion solution covers electrode;The sensor obtained after the electrode is modified by introducing modified multi-walled carbon nanotube in the application, not only has higher glucose detection sensitivity, but also has excellent stability.

The invention relates to a preparation method of a trace Fe optimized Ru nano-catalyst and application of the trace Fe optimized Ru nano-catalyst in hydrodechlorination reaction of parachlorophenol. The preparation method comprises the following specific steps: firstly, dissolving ruthenium chloride hydrate and ferric trichloride into ethylene glycol, adding PVP (Polyvinyl Pyrrolidone) into the solution, fully mixing, adjusting the pH value of the solution to 3-4, transferring into a glass bottle, and heating and reacting in an oil bath pan at 180 DEG C; and centrifuging, washing and drying the obtained product to obtain a black powdery solid, namely the Ru-Fe nano-catalyst. The hydrodechlorination process is carried out in a double-chamber electrolytic tank separated by a Nafion 117 membrane, an electrolyte is a Na2SO4 solution, a Ru-Fe electrode taking carbon cloth as a carrier is used as a working electrode, a Pt sheet is used as a counter electrode, and an Ag / AgCl electrode is used as a reference electrode. The Ru-Fe nano-catalyst provided by the invention has the advantages of stable structure, uniform metal distribution and excellent electron synergistic effect, and can efficiently catalyze hydrodechlorination of p-chlorophenol and generate cyclohexanol. The preparation process is simple, convenient and environment-friendly, has a good industrial application prospect, and is particularly suitable for green treatment and resource conversion of chlorine-containing organic wastewater.

The application discloses a preparation method of a novel catalyst coated membrane (CCM) functional layer, and belongs to the technical field of membrane electrode assemblies (MEA) of proton exchange membrane fuel cells (PEMFC). 2 The SiO2 with a nominal BET of 150 m 2 / g and a 20 wt% Nafion solution are configured into a solution, and the solvent for the solution is a mixture of isopropyl alcohol and water, wherein the mass ratio of Nafion to oxide is 1; S2, the slurry is subjected to 14 h ball milling and 30 min ultrasonic removal of agglomeration; S3, the SiO2 / Nafion slurry is sprayed onto the PEM cathode / anode surface by using an ultrasonic spraying instrument; S4, the catalyst slurry with an I / C ratio of 0.6 is sprayed onto the PEM cathode / anode surface to which the reinforced functional layer has been added by using the ultrasonic spraying instrument; and S5, the conventional MPL, GDL, sealing ring, flow channel, bipolar plate, insulating plate and clamp are pressed and assembled, and no additional sealing is required. By adding the functional layer, the water retention capacity of the membrane electrode is significantly improved, so that the membrane electrode can still maintain excellent proton conduction and output high power under low-humidity working conditions.

The present application relates to a kind of ultra-thin b orientation ZSM-5 zeolite molecular sieve membrane, preparation method and application in vanadium oxidation liquid flow battery, belong to liquid flow battery technical field. Low defect density, thin and [0k0] plane out orientation ZSM-5 zeolite separation membrane made of zeolite nanosheet realizes enhanced ion selectivity and ion conductivity, so as to improve battery performance. Therefore, VFB equipped with ZSM-5 zeolite membrane shows excellent vanadium resistance, self-discharge time reaches 116.2 hours, far more than Nafion 212 (45.9 hours). In addition, under 80mA cm ‑2 Current density, the performance of VFB remains stable in 1000 cycles.

The invention provides a proton exchange membrane as well as a preparation method and application thereof, and particularly relates to the technical field of proton exchange membranes. The proton exchange membrane has a layered structure, and the layered structure comprises a bottom layer, a middle layer and a top layer which are stacked in sequence; the bottom layer is a short-chain-chain perfluorinated sulfonic acid resin layer, the middle layer is a mixed perfluorinated sulfonic acid resin layer, the top layer is a long-chain-chain perfluorinated sulfonic acid resin layer, no obvious physical interface exists between the layers, and a three-dimensional interlocking structure is formed between every two adjacent layers through mutual diffusion and cocrystallization of molecular chain segments; wherein the number of the middle layers is larger than or equal to 1, and resin in the middle layers is short-branch-chain perfluorinated sulfonic acid resin and long-branch-chain perfluorinated sulfonic acid resin. Smooth connection of components and performance is achieved through the intermediate layer in gradient transition, and the overall mechanical strength, chemical durability and proton transmission efficiency of the membrane are remarkably improved. In addition, the three-dimensional interlocking structure enhances the interlayer bonding force, so that the film can still keep the structural integrity under the long-term operation condition.

The invention discloses a carbon nanotube / cadmium selenide quantum dot heterojunction photoelectric catalyst as well as a preparation method and application thereof. The method comprises the following steps: activating single-wall and / or multi-wall carbon nanotubes by aqua regia at room temperature, dispersing the single-wall and / or multi-wall carbon nanotubes in an aqueous solution containing CdCl2. 5H2O, adding a Na2SeSO3 selenium source and 3-mercaptopropionic acid, and reacting at 110-150 DEG C, so that CdSe quantum dots with the particle size of 1-5 nm are subjected to in-situ nucleation growth on the surfaces and / or the interiors of the carbon nanotubes and form a heterojunction interface. The obtained catalyst and Nafion are prepared into ink drops, the ink drops are coated on conductive glass to construct a photocathode, in an H-type electrolytic tank with a light path, a high-purity CO2 saturated bicarbonate aqueous solution is used as an electrolyte, Ag / AgCl is used as a reference electrode, and under irradiation of an LED light source with the maximum wavelength being 450 nm and bias voltage ranging from-0.1 V (vs. RHE) to-1.0 V (vs. RHE), CO is generated through water-phase photoelectrocatalysis CO2 reduction. The photoelectrocatalyst has the characteristics of simple synthesis method and excellent photoelectrocatalytic reduction effect of carbon dioxide.

The application discloses a kind of artificial synapse devices with color / electric dual weight regulation.The composition of the device includes: the surface edge of substrate, source electrode and drain electrode are respectively distributed with interval, and the surface of substrate between source electrode and drain electrode is covered with nanowire film;Nafion film and ion glue are sequentially covered on nanowire film.The device obtained by the application can realize the dual regulation of color weight and conductance weight under electric stimulation, and make the two weights have extremely short synaptic plasticity, and after removing stimulation for only 1 second, excitatory chroma is completely reduced to 0, and residual excitatory post-synaptic current is reduced to 1 / 3000 of initial value.

The invention relates to a fuel cell proton exchange membrane and a preparation method thereof, and the preparation method comprises the following steps: uniformly mixing a neutral Nafion solution and organic alcohol, and carrying out heat preservation treatment at 200-240 DEG C to obtain a resin solution; coating a first layer of resin solution on a substrate, covering the porous membrane on the first layer of resin solution, pre-drying, then coating a second layer of resin solution on the porous membrane, and pre-drying to obtain a composite membrane; and performing drying, heat treatment and post-treatment on the composite membrane to obtain the fuel cell proton exchange membrane. According to the invention, the organic alcohol is added into the neutral Nafion solution, and the resin solution meeting the requirements of the subsequent process can be obtained at one time through heat preservation treatment; the composite film is prepared by coating, so that the defect that bubbles are easily generated by negative-pressure impregnation is avoided; the proton exchange membrane is simple in preparation steps, low in cost and high in efficiency; the obtained proton exchange membrane is good in conductivity performance and excellent in mechanical performance.

The invention discloses a membrane electrode hot-pressing process optimization and Nafion dosage regulation and control system and method, and relates to the technical field of hydrogen fuel cell core component preparation. The method comprises the following steps: firstly, through a process parameter optimization algorithm and a Nafion dosage calculation model, outputting an optimal hot-pressing parameter and Nafion dosage scheme based on catalyst characteristics, and establishing association mapping; then relevant hardware assemblies are integrated to achieve hot pressing, regional coating and hot pressing-packaging synchronous forming, and finally membrane electrode data are collected through three types of monitoring assemblies and fed back to an intelligent software regulation and control module to trigger parameter self-adaptive adjustment. According to the scheme, the defects of poor interface contact, low mass transfer efficiency, frequent flooding and short service life in a traditional process are overcome, precise adaptation with a high-activity ultra-low platinum loading catalyst is realized, the proton conduction efficiency and the gas diffusivity of a membrane electrode are improved, the service life of the membrane electrode is prolonged, and the comprehensive cost of a fuel cell stack is reduced.

The present application relates to the technical field of biosensor, especially to a glucose sensor based on composite film and a preparation method thereof, after fixing layered MoS2 semiconductor material on a substrate, the present application continues to prepare ion gel film on the substrate, then modifies glucose oxidase on the surface of the ion gel film, after incubation and fixation, modifies a layer of Nafion film on the surface of the ion gel film, because glucose oxidase oxidizes and decomposes glucose to generate protons, with the selective proton passing effect of the Nafion film, the protons pass through the Nafion film to the porous network structure formed by the ion gel film and the layered MoS2 semiconductor material, and cooperate with the cations in the ion gel film to attract more carriers, and form a double-layer structure on the surface of MoS2, cooperate with the current multiplication effect, improve the transmission efficiency of the carriers, and improve the sensitivity of the sensor.

The application discloses a method for underwater two-dimensional AC flow field sensing by using a tubular IPMC sensor. The method processes a tubular IPMC sensor by using Nafion tube, and performs an underwater one-dimensional AC flow field sensing characterization experiment on the tubular IPMC sensor, and uses the tubular IPMC sensor to perform underwater two-dimensional AC flow field sensing. The application solves the problem that existing IPMC AC flow speed sensors lack effective algorithms and models, and has important significance for promoting the application of intelligent flexible materials and the development of underwater sensing technology.

The invention provides a method for high-efficiency electrocatalytic reduction of carbon dioxide by an ionic liquid system cooperating with a cadmium sulfide catalyst. The electrocatalytic reduction process of the method is carried out by placing a three-electrode system in an H-shaped electrolytic cell filled with ionic liquid. The three-electrode system comprises a reference electrode, a counter electrode and a working electrode, the silver / silver ion electrode is the reference electrode, the platinum net electrode is the counter electrode, and a cadmium sulfide catalyst which is loaded on carbon paper and has a large specific surface area and high conductivity is the working electrode. The method specifically comprises the following steps: mixing a cadmium sulfide catalyst with acetone, adding a Nafion solution, carrying out ultrasonic treatment to obtain a uniformly mixed suspension, uniformly dispensing the suspension on carbon paper, and naturally airing at room temperature to obtain a working electrode; and placing the working electrode in the ionic liquid-acetonitrile-aqueous solution electrolyte, and continuously introducing carbon dioxide gas to carry out a constant-potential electrochemical reduction reaction. The electro-catalysis system is easy to operate and mild in reaction condition, the preparation method of the cathode catalyst is simple, industrial development value is achieved, and an important and practical way is provided for fixation and recycling of carbon dioxide.

The invention belongs to the technical field of catalysts, and particularly relates to an electrode with sulfide tolerance and a preparation method thereof. The preparation method comprises the following steps: preparing a mixed solution by taking a palladium precursor, a molybdenum precursor Mo (CO) 6, a reducing agent, a morphology regulating agent and a surface protecting agent as raw materials, then carrying out hydrothermal reaction on the mixed solution, generating an ultrathin PdMo alloy nanosheet in situ in the mixed solution in the reaction process, and sequentially carrying out demulsification, washing and drying to obtain the PdMo NSs alloy nanosheet. And taking the PdMo NSs alloy nanosheet, carbon powder, Nafion and a solvent as raw materials, enabling the PdMo alloy nanosheet to be uniformly anchored on the carbon powder, and then drying to obtain the electrode with sulfide tolerance. The electrode with sulfide tolerance prepared by the method disclosed by the invention realizes the consideration of activity, stability and sulfur resistance, and overcomes the technical defects existing in the existing preparation method.

The invention provides a proton exchange membrane electrolyzed water anode slurry and a preparation method thereof. The proton exchange membrane electrolyzed water anode slurry comprises 10%-30% of iridium-based catalysts with different valence states, 5%-15% of water, 35%-65% of an organic alcohol solvent, 15%-35% of a Nafion resin solution and 0.06%-0.6% of a surfactant. The iridium-based catalysts with different valence states comprise a first catalyst and a second catalyst; the first catalyst is selected from one or a combination of more than two of Ir elementary substance, IryCo (1-y) and IrzNi (1-z), and 0 lt; yt; Yt; 1, 0lt; zlt, zlt; 1; the second catalyst is a doped ruthenium-iridium-terbium oxidation-state catalyst, and the molecular formula of the second catalyst is Tb2RuxIr (2-x) O7, 0lt; xlt; 2. By introducing the combination of the anionic surfactant and the cationic surfactant, the agglomeration of catalyst particles can be effectively reduced, and the dispersity of the catalyst and the stability of the slurry are improved.

The application relates to the field of gas sensors, and particularly discloses an electrochemical acetylene sensor electrode, a preparation method thereof and an electrochemical acetylene sensor. The electrochemical acetylene sensor electrode comprises a polytetrafluoroethylene film and a slurry coated on the polytetrafluoroethylene film, wherein the slurry comprises nano gold particles, nano magnesium oxide, nano barium oxide, modified conductive carbon powder and a Nafion solution in a weight ratio of (0.47-0.50):(0.02-0.20):(0.02-0.18):(1-3):(0.6-2.0); and the modified conductive carbon powder is obtained by mixing potassium permanganate, deionized water and conductive carbon and then performing ball milling. The application realizes the effects of high sensitivity and high linearity of acetylene gas, greatly improves the selectivity of the electrochemical acetylene sensor, and has the advantages of low detection limit, high sensitivity and good selectivity.

This invention discloses a Sn-Cu3Sn1 / Cu catalyst and its preparation, as well as a supported copper-tin catalyst electrode and its preparation and application. The microstructure of the Sn-Cu3Sn1 / Cu catalyst consists of a Cu3Sn1 alloy layer reconstructed on the surface of copper nanoparticles, with Sn atoms grown at the Sn sites of the Cu3Sn1 alloy as termination sites. The supported copper-tin catalyst electrode is obtained by uniformly mixing a slurry containing the Sn-Cu3Sn1 / Cu catalyst with a 5%-25% (w / w) Nafion solution, uniformly coating the mixed slurry onto an electrode material, and then drying. This invention provides the application of the supported copper-tin catalyst electrode in the electrocatalytic selective hydrogenation of acetylene, exhibiting advantages such as high conversion rate, high selectivity, and high Faradaic efficiency.

The invention provides a proton exchange membrane for a flow battery, a preparation method of the proton exchange membrane and the flow battery. The method comprises the following steps: mixing an organic solvent and perfluorinated sulfonic acid resin, and stirring to obtain a perfluorinated sulfonic acid resin solution; adding bismuth citrate nano powder into the perfluorosulfonic acid resin solution, and emulsifying and dispersing to obtain a prefabricated membrane solution; under vacuum, irradiating the prefabricated membrane liquid with ultraviolet light to obtain a membrane preparation liquid; coating a substrate with the film-making liquid to obtain a wet film attached to the substrate; and drying and annealing the wet membrane attached to the base material, and stripping the formed membrane from the base material to obtain the proton exchange membrane. The proton exchange membrane contains the bismuth citrate catalyst, so that the overresistance of the membrane is effectively reduced, and meanwhile, the hydrogen evolution reaction of a negative electrode is inhibited.

The present invention relates to an electrode for a hydrogen evolution reaction in an alkaline water electrolysis cell, wherein the electrode comprises: a co-catalyst consisting of a composite containing a Lewis acid-containing material and a metal-organic framework (MOF); and a catalyst surrounded by the co-catalyst. According to the present invention, the water dissociation step of the alkaline hydrogen evolution reaction is promoted, hydrogen gas generated by the hydrogen evolution reaction can easily permeate through the structure, and Nafion is uniformly dispersed by the large pores created by the MOF, thereby implementing the co-catalyst effect across the entire surface while minimizing catalyst poisoning.

The application discloses a sensor preparation method for nitrite detection and application, and the method comprises the following steps: annealing an indium oxide precursor to obtain indium oxide particles, and then compounding the indium oxide particles with gold nanoparticles to obtain gold-indium oxide nanocomposites. The gold-indium oxide nanocomposites are dispersed in an ethanol solution, ultrapure water and a Nafion solution to prepare a suspension of the gold-indium oxide nanocomposites, and the suspension is dripped on a glassy carbon electrode by using a pipette gun. The electrode is dried to be ready for electrochemical test. The sensor prepared by the method can realize rapid and accurate detection of nitrite in aquaculture, has high sensitivity, selectivity and anti-interference, and overcomes the defects of high price, long time and complex operation of traditional detection methods, and has certain guiding and reference significance for the aquaculture industry.

The detection method can be used to detect the presence of uranium hexafluoride (UF6) in a gas stream (G). The detection method comprises humidifying the gas stream by circulating the gas stream (G) in contact with a sulfonated tetrafluoroethylene-based fluoropolymer copolymer, in particular Nafion, and then detecting the presence of hydrogen fluoride (HF) in the gas stream (G) by means of a sensor.

This invention discloses a method for preparing a boron-doped self-supporting three-dimensional non-metallic carbon-based catalytic electrode and its application in electrocatalytic nitrogen reduction. Using starch, boric acid, and sodium carboxymethyl cellulose as raw materials, the boron-doped self-supporting three-dimensional non-metallic carbon-based catalytic electrode is obtained through freeze-drying and carbonization, or freeze-drying, pre-carbonization, and carbonization. This electrode can be used as a catalytic cathode for the electrochemical reduction of nitrogen. The product exhibits rich morphology and porosity. Boron doping intensifies the hybridization of the electronic structure and increases defects. This change effectively regulates nitrogen adsorption to promote the entire electrochemical reduction of nitrogen, resulting in an ammonia yield of 10 μg·h⁻¹. ‑1 ·mg ‑1 The invention eliminates the need for complex steps such as Nafion and carbon cloth treatment, making it convenient, efficient, and low-cost. The boron-doped self-supporting three-dimensional non-metallic carbon-based catalytic electrode produced is virtually pollution-free when discarded and easy to recycle.

The utility model relates to the technical field of electrochemistry, and discloses a Luggin capillary gas diffusion electrolytic cell, which comprises a working electrode, a Luggin capillary, a Nafion tube, a reference electrode, a counter electrode and electrolyte, the gas diffusion electrolytic cell further comprises a thermometer and an exhaust passage, the outer wall of the Luggin capillary is fixedly connected to the bottom side of the gas diffusion electrolytic cell, and the outer wall of the Nafion tube is fixedly connected to the bottom side of the gas diffusion electrolytic cell. The Nafion tube is arranged in an opening, close to the end of the working electrode, of the Luggin capillary tube in a penetrating manner, the working electrode, the reference electrode and the counter electrode are all arranged in the electrolyte, and the counter electrode and the working electrode are oppositely arranged in the electrolytic tank body. According to the utility model, the Luggin capillary tube is fixedly arranged on the bottom side of the gas diffusion electrolytic tank, so that the solution resistance reduction effect of the Luggin capillary tube is exerted, the uniform distribution of electric field lines between the working electrode and the counter electrode is not influenced, the uniformity of an electric field between the working electrode and the counter electrode is ensured, and more accurate data can be obtained.

The utility model discloses a trace methane and nitrous oxide isotope component separation, conversion and enrichment device, and belongs to the technical field of isotope analysis and test. Comprising a methane sample tube, a nitrous oxide sample tube, a helium bottle, a first Nafion trap, a VOC adsorption trap, a combustion tube, a four-way valve, an eight-way valve, a carbon dioxide removal assembly, a first enrichment cold trap, a second enrichment cold trap and a chromatographic column, the helium tank is communicated with the gas inlet ends of the methane sample tube and the nitrous oxide sample tube, the gas outlet end of the methane sample tube is communicated with the first Nafion trap and the VOC adsorption trap, the VOC adsorption trap is communicated with the carbon dioxide removal assembly through a four-way valve, the carbon dioxide removal assembly is communicated with a combustion tube, the combustion tube is communicated with the first enrichment cold trap through an eight-way valve, and the combustion tube is communicated with the second enrichment cold trap through an eight-way valve. The first enrichment cold trap is communicated with a second enrichment cold trap through an eight-way valve, and the second enrichment cold trap is communicated with the chromatographic column. According to the utility model, methane or nitrous oxide gas in the air can be separated, converted and enriched, so that methane or nitrous oxide in the air can be measured by instruments such as a mass spectrometer and the like.

The invention discloses a humidity-driven deformation color-changing flexible film based on a magnetic field induction method and a preparation method and application thereof, and relates to the technical field of humidity-driven flexible films. The preparation method comprises the following steps: (1) preparing magnetic MXene coated Fe3O4 particles; (2) preparing a Nafion / crystal violet / MXene coated Fe3O4 mixed solution; (3) inducing the accumulation of the magnetic MXene coated Fe3O4 particles in the mixed solution through a magnetic field; and (4) preparing the structured Nafion-crystal violet-MXene coated Fe3O4 film with the corresponding humidity. The obtained film is made of Nafion / crystal violet / MXene coated Fe3O4 materials, when the film is stimulated by humidity, the film can be bent and deformed, the color is changed from yellow to green, and the film has the advantages of being high in deformation capacity and obvious in color changing effect and has application potential in the fields of drivers, bionic robots and the like.