195 results about "Nafion" patented technology

The invention discloses a composite electrode material for removing uranium through photoelectrocatalysis and a preparation method and application of the composite electrode material, and belongs to the technical field of catalytic materials and wastewater treatment.The preparation method of the composite electrode material comprises the following steps that a ZIF-8 material, copper salt and ferric salt are mixed, and a first metal composite material is prepared; reacting the first metal composite material with a KOH solution to prepare a second metal composite material; carrying out carbonization treatment on the second metal composite material, and then carrying out acid treatment by using acid to obtain a bimetallic atom catalytic material; the preparation method comprises the following steps: dispersing a bimetallic atom catalytic material and a g-C3N4 material in a mixed solution containing phytic acid and a Nafion solution to obtain catalyst ink; and coating the catalyst ink on a substrate, and carrying out illumination drying to obtain the composite electrode material. According to the composite electrode material, under the synergistic effect of the bimetallic single atomic cluster catalyst and g-C3N4, respective advantages are fully exerted, and efficient deposition removal of uranium is achieved.

The invention relates to the technical field of gas sensors, and particularly discloses an electrochemical formaldehyde sensor electrode, a preparation method thereof and an electrochemical formaldehyde sensor. The electrochemical formaldehyde sensor comprises an electrochemical formaldehyde sensor electrode and a binary electrolyte, the electrochemical formaldehyde sensor electrode comprises a polytetrafluoroethylene film, the polytetrafluoroethylene film is coated with slurry for an electrochemical formaldehyde sensor electrode; and the slurry is formed by mixing nano manganese dioxide, platinum carbon and a Nafion solution. According to the electrochemical formaldehyde sensor, the electrode prepared from the slurry formed by mixing the nano manganese dioxide, the platinum carbon and the Nafion solution has relatively high catalytic activity, so that the sensor shows extremely high sensitivity and extremely good linearity on formaldehyde, and the electrochemical formaldehyde sensor has relatively high catalytic activity by regulating and controlling the proportion of the binary electrolyte. The electrochemical formaldehyde sensor has the advantages of high sensitivity, low cost, fast response, high detection precision and the like.

The invention relates to the field of fuel cells, and discloses a preparation method of an MOF (at) COF core-shell heterostructure doped Nafion-based proton exchange membrane, and the preparation method comprises the following steps: step 1, preparing MOF-NH2 powder; step 2, preparing MOF-NH2 (at) COF-SO3H powder, and preparing a COF-SO3H powder; and step 3, dispersing the MOF-NH2 (at) COF-SO3H powder into a 5% Nafion dispersion liquid, and drying to form the film. The proton exchange membrane is based on Nafion, COF and MOF, the MOF and the COF form an MOF-coated COF core-shell heterostructure, pore channels of the COF are modified by sulfonic acid, so that water molecules can be effectively confined, the water retention rate is increased, and a rigid MOF framework provides enough strength to prevent the proton exchange membrane from swelling.

The invention discloses an electrocatalytic oxidation method for highly selectively converting 5-hydroxymethylfurfural into 2, 5-furandicarboxylic acid by using a cobalt-nickel bimetallic catalyst, and belongs to the technical field of electrochemistry. Firstly, foamed nickel is pretreated; secondly, preparing a cobalt-nickel mixed solution, synthesizing the catalyst by adopting a solvothermal method, and characterizing the catalyst; and thirdly, preparing a three-electrode system by taking the cobalt-nickel catalyst as a working electrode, a spiral platinum wire electrode as a counter electrode, a Hg / HgO electrode as a reference electrode, an alkaline solution as an electrolyte and a Nafion 117 proton membrane as a diaphragm to realize conversion. And finally, testing the stability and cyclicity of the cobalt-nickel catalyst. Under the same potential, the material has the highest current density, the maximum electrochemical active area and the optimal charge transfer rate; the self-degradation of HMF can be effectively inhibited, the electrocatalytic oxidation has lower initial potential than the oxygen evolution reaction, and the electrode cycle stability is good; the method is simple in process, mild in condition and beneficial to industrial production.

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 dopamine sensor working electrode based on an MOF material and a preparation method thereof, and belongs to the technical field of electrochemical sensing. The working electrode is composed of a pure MOF Cu-HHTP modified glassy carbon electrode and a Nafion film covering the surface of the glassy carbon electrode, and the preparation method of the working electrode comprises the following steps: synthesizing Cu-HHTP (Cu < 2 + > and a hexahydroxy triphenyl ligand are coordinated to form a two-dimensional honeycomb layer) through a solvothermal method, dispensing Cu-HHTP dispersion liquid on the surface of the glassy carbon electrode, and then covering the glassy carbon electrode with the Nafion film to form the combined electrode. The dopamine sensor prepared by the preparation method disclosed by the invention has high sensitivity, high anti-interference capability and long-term stability. The preparation process is simple, complex conductive additives are not needed, and the method is suitable for rapid and accurate detection of dopamine in complex biological samples.

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 provides a method for removing nitrate in water by using a modified zero-valent iron aerogel electrocatalyst, which comprises the following steps: preparing a mixed solution of ferrous sulfate and sodium sulfide, preparing a sodium borohydride solution, mixing and magnetically stirring the mixed solution and the sodium borohydride solution to obtain black colloid, and finally obtaining vulcanized zero-valent iron aerogel, dispersing the obtained sulfurized zero-valent iron aerogel and a Nafion solution in absolute ethyl alcohol to prepare a catalyst mixed solution; potassium nitrate and potassium hydroxide are dissolved in a pure water solution to serve as electrolyte, a sulfurized zero-valent iron aerogel electrode is used as a cathode, a platinum sheet is used as an anode, a mercuric oxide electrode is used as a reference electrode, and an electrocatalytic reduction reaction is carried out by using a three-electrode system. The technology not only can improve the efficiency of water nitrate pollution treatment, but also conforms to the concept of green and low-carbon development, and has a wide environment application prospect.

The invention belongs to the technical field of fuel cells, and discloses a metal organic framework material with proton conductivity and a preparation method and application thereof. Pyrazolo [3, 4-c] pyridine is used as a ligand, a binuclear cuprous cluster is used as a connection point, a two-dimensional layered structure is constructed through the ligand and the binuclear cuprous cluster, a cuprous multi-nitrogen heterocyclic metal organic framework is formed, the cuprous multi-nitrogen heterocyclic metal organic framework is oxidized, and the cuprous multi-nitrogen heterocyclic metal organic framework is obtained. Divalent copper ions and monovalent copper ions exist in the oxidized cuprous multi-nitrogen heterocyclic metal organic framework, and the metal organic framework material with proton conductivity is obtained. The proton conductivity of the metal organic framework material can be remarkably improved by adopting a metal post-synthesis modification oxidation technology, and the proton conductivity of the metal organic framework material is comparable with that of commercial Nafion, and an oxidized sample shows extremely high chemical stability; the problem of poor stability of a non-fluorinated hydrocarbon polymer proton exchange membrane and inorganic solid acid researched in the prior art is solved.

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 discloses a method for synthesizing a NiFeCu array catalyst through a template method and the NiFeCu array catalyst, and relates to the technical field of catalysts.The method comprises the following steps that foamy copper is cleaned, and surface oxides and pollutants are removed; uniformly mixing an ammonium persulfate solution with the concentration of 0.1-0.2 mol / L and a NaOH solution with the concentration of 1 mol / L according to the volume ratio of 1: 1 to obtain a mixed solution I, and putting the cleaned foamy copper into the mixed solution I to react for 20-60 minutes to obtain a Cu (OH) 2 / CuF array template; the Cu (OH) 2 / CuF array template is placed in a second mixed solution containing oxalic acid, a nickel source and an iron source to react for 30-120 min, and a NiFeCu array catalyst of a nanorod array structure is obtained; when applied to an OER working electrode, the NiFeCuOX array catalyst is formed through activation, a nafion binder needed by a similar powder catalyst is not needed, effective contact between an electrolyte and the catalyst and rapid release of oxygen can be guaranteed, and the electrochemical performance is greatly improved.

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 belongs to the technical field of fuel cells, and discloses a Preyssler type polyacid crystalline material, the structural formula of the Preyssler type polyacid crystalline material is {[Cd5 (mu2-H2O) (H2O) 14 (H5P5W30O110) (btp) 4]. 8H2O} n, and the asymmetric unit of the Preyssler type polyacid crystalline material comprises 2.5 crystallographically independent Cd (II) ions, a half {P5W30} unit, 2 btp ligands, 8 coordinated water molecules and 4 free water molecules. The powder proton conductivity of the compound reaches 1.70 * 10 <-3 > S cm <-1 > under the conditions of 85 DEG C and 98% RH, the proton conductivity of a composite membrane formed by the compound and Nafion reaches 2.20 * 10 <-2 > S cm <-1 >, and large-scale commercial application of proton exchange membrane fuel cells can be achieved.

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 belongs to the technical field of ocean in-situ monitoring, and relates to a gas measuring device and method suitable for ocean in-situ long-term monitoring. The device comprises a gas-liquid separation module, a dehumidification module, a detection module and a calibration module which are arranged in a pressure-resistant cabin, two water through holes are oppositely formed in the pressure-resistant cabin; two ends of a degassing pipe in the gas-liquid separation module are respectively communicated with the two water ports, one end of the degassing pipe is provided with a water pump, and sample gas separated by the degassing pipe enters the dehumidification module through a gas outlet; the dehumidification module comprises a Nafion tube, a cold trap and a drying tube which are connected in sequence, and a refrigeration sheet is attached to the cold trap; a gas detector in the detection module is connected with the drying pipe through a sample gas pipe, a gas pump and a normally open solenoid valve are arranged on the sample gas pipe, and gas detected by the gas detector returns to the degassing pipe through a Nafion pipe; and the calibration module is connected to the sample gas pipe behind the normally open solenoid valve. The device can accurately, stably and continuously monitor the concentration of a specified type of gas in seawater, and can meet the requirement of ocean in-situ long-term monitoring.

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 application discloses a non-metal modified hydrogen evolution material and a preparation method. The Sx-CoPTA is prepared by a ligand regulation strategy, a precursor solution is prepared from cobalt nitrate hexahydrate, 4,4-biphenyldicarboxylic acid, 1,4-benzenedithiol, N,N-dimethylformamide, ethanol and water, and during the preparation, ultrasonic treatment, stirring, washing, drying and low-temperature centrifugal reaction treatment are carried out, and finally, the S-CoPTA is generated, and the hydrogen evolution electrode material is synthesized by smearing the Nafion solution on the nickel foam. The catalytic electrode material S1-CoPTA prepared by the application has a large specific surface area of the MOF material, breaks the original symmetrical structure of the MOF material, effectively improves the conductivity of the MOF material, and further improves the hydrogen evolution efficiency of the electrode material, and has a center structure and a function simulation similar to the [Fe-Fe] hydrogenase.

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 belongs to the technical field of electrocatalytic nitrate reduction synthesis of ammonia, and particularly relates to a preparation method of a cobalt-iron alloy catalyst, which at least comprises the following steps: 1, preparing a cobalt-iron oxide precursor by adopting an epoxide gel method; and 2, mixing the cobalt-iron oxide precursor powder obtained in the step 1 with an alcohol solvent, water and a Nafion solution, carrying out ultrasonic treatment to prepare ink, spraying the ink on a current collector, and then carrying out electroreduction on a loaded cathode material with a constant current in an electrolyte protected by argon to generate the cobalt-iron alloy catalyst. Compared with the prior art, the CoxFey alloy catalyst with a lattice expansion effect and an adjustable electronic structure is prepared by combining an alloying strategy with an in-situ electrochemical reduction method, so that the problem of adsorption-activation imbalance of an intermediate of a Co-based catalyst in a low-concentration NO3 <-> environment is relieved, and the practical process of electro-catalysis NO3 <-> RR for low-concentration NO3 <-> wastewater treatment is accelerated.

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.