402 results about "Perfluorosulfonic acid" patented technology

The invention belongs to the technical field of analysis and detection, and discloses a method for detecting perfluorinated and polyfluoroalkyl substances in cosmetics, which comprises the following steps: (1) mixing a perfluorinated and polyfluoroalkyl substance standard solution and an isotope internal standard solution to obtain a mixed standard solution; detecting the mixed standard solution by adopting a liquid chromatograph-mass spectrometer, drawing a standard curve, and calculating to obtain a linear equation; (2) mixing a cosmetic sample with the isotope internal standard solution, adding an extracting solution, extracting, and filtering to obtain a mixed solution to be detected; detecting the mixed to-be-detected solution by adopting the liquid chromatograph-mass spectrometer to obtain a detection result, and substituting the detection result into the linear equation to obtain the content of the perfluoro and polyfluoroalkyl substances in the mixed to-be-detected solution, the perfluoro and polyfluoroalkyl substances comprise perfluorocarboxylic acid, perfluorosulfonic acid, a fluorine polymer, perfluoroalkyl ether sulfonic acid, saturated fluorine telomere acid and perfluoroether carboxylic acid.

The invention relates to the technical field of proton exchange membranes, and provides a covalent grafted heteropoly acid modified perfluorosulfonic acid membrane as well as a preparation method and application thereof. According to the invention, polypropylene glycol monoalkyl ether and Keggin type vacancy heteropoly acid are subjected to covalent grafting, and then the obtained covalent grafted heteropoly acid is used as an additive to modify the perfluorosulfonic acid membrane, so that the leakage problem of heteropoly acid in the proton exchange membrane can be effectively relieved, and meanwhile, the excellent proton conduction performance of heteropoly acid is also retained; moreover, the polypropylene glycol monoalkyl ether has relatively large molecular weight, so that the heteropoly acid can be anchored more firmly in the perfluorosulfonic acid membrane, and the proton conduction capability of the heteropoly acid is fully exerted. The result of the embodiment shows that the covalent grafted heteropoly acid modified perfluorosulfonic acid membrane provided by the invention shows excellent proton conduction performance and chemical stability, and has a wide application prospect.

The invention is applicable to the technical field of proton exchange membranes, and particularly relates to a perfluorosulfonic acid proton exchange composite membrane which is prepared by the following steps: preparing a perfluorosulfonic acid resin solution: dissolving the perfluorosulfonic acid resin solution in a mixed solvent to form a membrane casting solution; impregnating and filling: impregnating a porous base membrane in the obtained perfluorinated sulfonic acid resin solution, and keeping at 20-80 DEG C for 1-120 minutes; drying and forming: taking out the impregnated film, and drying to form a composite film; and protonation treatment: treating the composite membrane in an acid solution, and washing to be neutral to obtain the perfluorosulfonic acid proton exchange composite membrane. According to the invention, the problems of deformation and damage of the battery in operation are effectively avoided; meanwhile, the high proton conductivity is ensured, so that the ion transmission efficiency is maintained; the introduction of the ePTFE porous skeleton enhances the membrane body and reduces the use amount of the perfluorinated sulfonic acid resin at the same time, the composite membrane is compact in structure and balanced in performance, and the durability and reliability of the fuel cell are greatly improved.

The invention belongs to the technical field of membrane electrodes, and particularly relates to a hydrogen fuel cell catalyst layer slurry based on hydrophilic and hydrophobic regulation and a preparation method of a membrane electrode. The slurry of the catalyst layer comprises the following contents: the slurry of the PEM close to the cathode side comprises a Pt / C catalyst, deionized water, a perfluorosulfonic acid ionic polymer solution and isopropanol; the mass ratio, namely I / C ratio, of the ionic polymer to the carbon carrier is 0.8-1.2; the GDL cathode side slurry comprises a Pt / C catalyst, deionized water, a perfluorosulfonic acid ionic polymer solution, a PTFE aqueous solution (polytetrafluoroethylene aqueous solution) and isopropanol, and the mass ratio of the ionic polymer to the carbon carrier, namely I / C ratio, is 0.3-0.5. High hydrophilic ionomer content is reserved on the side, close to the cathode, of the PEM, proton conduction and catalyst active site wetting are guaranteed, the proportion of hydrophobic ionomers and hydrophobic materials is increased on the GDL side, a drainage channel is formed, liquid water is prevented from blocking gaps, then the performance of the membrane electrode is remarkably improved, and the interface contact resistance is stabilized to be 1.64-1.76 m omega (2.5 A / cm < 2 >).

The invention discloses a PEM proton exchange membrane for water electrolysis and a preparation method thereof, and relates to the technical field of water electrolysis. The proton exchange membrane is composed of five layers of structures including a modified sulfonated composite resin layer, an enhancement layer, a water retention layer, a catalyst layer and an anti-permeation layer, the preparation method comprises the following steps: the modified sulfonated composite resin layer is prepared by dispersing perfluorinated sulfonic acid resin and sulfonated lignin in a solvent, coating and drying; the reinforcing layer is prepared by blending a PTFE (Polytetrafluoroethylene) emulsion, a carbon nanotube and a tetrafluoroethylene-hexafluoropropylene copolymer, and then carrying out casting sintering, plasma treatment and hot press molding; the water retention layer is prepared by adopting an electrostatic spinning technology; the catalyst layer is formed by spraying a precursor solution step by step and drying; the anti-permeation layer is prepared through photoetching-etching array construction, resin coating and fluorosilane modification. The prepared proton exchange membrane has excellent mechanical strength, proton conductivity and stability, and is suitable for the field of PEM water electrolysis.

The invention provides catalyst slurry as well as a preparation method and application thereof. The method comprises the following steps: premixing a first ionomer solution and a catalyst, and adding a first solvent into the system for first mixing to form first slurry; performing second mixing on the first slurry, a second ionomer solution and a second solvent to form second slurry; performing high-pressure nano-dispersion on the second slurry to obtain catalyst slurry; wherein the first ionomer solution is prepared from the following components in percentage by weight: 5 to 30 percent of perfluorinated sulfonic acid resin and 70 to 95 percent of water; the second ionomer solution is prepared from the following components in percentage by weight: 5 to 30 percent of perfluorinated sulfonic acid resin, 10 to 70 percent of alcohol solvent and 0 to 50 percent of water. On the basis, the catalyst slurry is better in stability, and the membrane electrode performance is better.

The invention relates to a gas diffusion layer suitable for low-humidity operation and a preparation method and application thereof.The gas diffusion layer comprises a hydrophobic substrate layer and a microporous layer, the microporous layer comprises hydrophilic particles, hydrophobic particles and perfluorinated sulfonic acid resin, and the microporous layer is of a leaf vein-like bionic design structure. According to the gas diffusion layer disclosed by the invention, the microporous layer constructs an efficient gas and water transmission channel by utilizing hydrophilic particles and hydrophobic particles, and the microporous layer structure of the gas diffusion layer is subjected to'leaf vein 'bionic design, so that the gas diffusion layer has high gas transmission characteristic while having high moisture retention; the problem of poor reaction gas transmission in the membrane electrode of the proton exchange membrane fuel cell under high moisture retention is effectively solved, and high-performance stable operation of the membrane electrode of the proton exchange membrane fuel cell under low reaction gas humidification is realized.

The invention discloses an inorganic-organic composite solid electrolyte as well as a preparation method and application thereof, and relates to the technical field of electrolytes. The inorganic-organic composite solid electrolyte comprises a polymer matrix, a filler and a lithium salt, wherein the polymer matrix is lithium perfluorosulfonate, the filler is lithium lanthanum zirconium oxide, and the lithium salt is LiTFSI. The inorganic-organic composite solid electrolyte is high in ionic conductivity, good in stability and capable of inhibiting growth of lithium dendrites, an electrochemical window can reach 4.6 V or above, and the inorganic-organic composite solid electrolyte can adapt to most of electrode materials in the market and is suitable for preparing batteries, especially lithium batteries. The obtained battery has excellent electrochemical stability, lithium stability, cycling stability, ion migration performance and rate capability, and can be applied to the field of new energy automobiles.

The invention belongs to the field of proton exchange membrane fuel cells, and particularly relates to a preparation method of a perfluorinated sulfonic acid resin dispersion liquid, which comprises the following steps: S1, blending water, alcohol and a third solvent according to a ratio, and uniformly stirring at room temperature to obtain a blended solvent; s2, adding the perfluorinated sulfonic acid resin into the blending solvent, and stirring to obtain the perfluorinated sulfonic acid resin dispersion liquid. Compared with the prior art, the problems that in the prior art, the preparation process is complex, and the prepared dispersion liquid is high in viscosity are solved; the preparation can be completed at normal temperature and normal pressure, and the prepared perfluorinated sulfonic acid resin dispersion liquid is relatively low in viscosity and convenient to further process and form a film.

The invention provides a composite proton exchange membrane as well as a preparation method and application thereof. The composite proton exchange membrane comprises a polymer porous supporting layer and perfluorinated sulfonic acid resin layers arranged on the surfaces of the two sides of the polymer porous supporting layer. The perfluorosulfonic acid resin layer contains a functional additive, the functional additive comprises a metal oxide-loaded three-dimensional self-supporting material, and the three-dimensional self-supporting material is composed of sulfonated graphene and carbon nanotubes. The functional additive is introduced into the perfluorinated sulfonic acid resin layer, sulfonated graphene with good conductivity and water solubility enables the composite proton exchange membrane to show extremely high functional density in the use process of a battery, and the mechanical strength of the composite proton exchange membrane is improved by introducing the carbon nanotubes with good conductivity and water solubility; and the introduction of the metal oxide prolongs the service life of the composite proton exchange membrane. Therefore, by introducing the functional additive, the electrical property and the service life of the composite proton exchange membrane are remarkably improved, and the composite proton exchange membrane has a good development prospect.

The application discloses an anode catalyst layer and a preparation method thereof and a membrane electrode, relates to the technical field of proton exchange membrane water electrolysis, and the anode catalyst layer is a single-layer structure and is prepared from an anode catalyst slurry after drying, the anode catalyst slurry comprises the following components in parts by weight: 0.05-10 parts of a polymer compound; 0.5-10 parts of an iridium catalyst; 0.5-12 parts of a perfluorosulfonic acid resin; and 5-120 parts of a solvent; wherein the polymer compound is used to form a reinforcing structure in the anode catalyst layer, the polymer compound comprises at least one of sodium hydroxymethyl cellulose, polyvinylidene fluoride, polyacrylic acid, polyimide or butadiene styrene rubber, and the mass of the polymer compound is 20-100% of the mass of the anode catalyst. By introducing the polymer compound, the mechanical performance and electrochemical performance of the membrane electrode can be improved.

The invention belongs to the technical field of high polymer materials, and particularly relates to a composite proton exchange membrane and a preparation method thereof. According to the prepared composite proton exchange membrane, the perfluorosulfonic acid resin capable of being industrially applied is selected as a base membrane material, and the modified polybenzimidazole polymer resin is added, so that the problem of high ion permeation rate of a perfluorosulfonic acid proton exchange membrane in the prior art is solved; interpenetration and permeation of the electrolyte in the use process of the perfluorosulfonic acid proton exchange membrane can be reduced, cross contamination of positive and negative electrolyte is greatly reduced, and the service life of the electrolyte is prolonged. The PBI is functionalized, so that the proton transmission capacity of the PBI is improved, and the proton exchange membrane formed by blending the functionalized PBI and the perfluorinated sulfonic acid resin can keep excellent vanadium resistance, excellent proton transmission capacity and relatively high ion selectivity at the same time. The preparation process is simple, and the prepared proton exchange membrane can meet the performance and long-term stability use requirements of a flow battery.

The invention provides perfluorosulfonic acid resin and a polymerization method. The polymerization method comprises the following steps: mixing perfluoromethyl vinyl ether, perfluorosulfonyl fluoride vinyl ether and a fluorine-containing solvent to obtain a mixed solution; and adding an initiator into the mixed solution, introducing a tetrafluoroethylene monomer, carrying out a copolymerization reaction, carrying out solid-liquid separation, and carrying out transformation and drying to obtain the perfluorinated sulfonic acid resin. The perfluoromethyl vinyl ether monomer is introduced into a copolymerization system, so that the rigidity of a polymer main chain is effectively reduced, and the flexibility and low-temperature mechanical strength of the resin are enhanced; the crystallinity is effectively reduced, the Tg is adjusted, and the catalyst is suitable for low-temperature proton exchange membrane fuel cells and other application scenes; the introduction of perfluoromethyl vinyl ether improves the compatibility between the main chain and the sulfonyl fluoride-containing side chain, and is beneficial to the formation of a clearer and more continuous hydrophilic / hydrophobic microphase separation structure. A stable proton conduction network is facilitated, and the electrochemical performance of the resin under harsh working conditions is remarkably improved.

The invention provides a perfluorosulfonic acid diaphragm and a preparation method and application thereof, and belongs to the technical field of battery diaphragms.The perfluorosulfonic acid diaphragm is characterized in that lithium-containing sulfonic acid polyamide is combined with PTFE and PP / PE base membranes to construct a base membrane-functional layer-protective layer three-layer structure, and the interlayer synergistic effect is achieved through the micropore filling technology; the lithium-containing sulfonic acid polyamide layer provides an ion conduction channel, PTFE fills micropores to enhance stability and wettability, the limitation that a traditional single coating is prone to stripping is broken through, and the lithium-containing sulfonic acid polyamide composite coating has the advantages of being high in ionic conductivity, good in mechanical performance, good in thermal stability and the like, is particularly suitable for solid-state batteries, lithium metal batteries and other scenes needing to absolutely obstruct dendritic crystals, and improves the safety of the batteries.

The invention relates to a gas diffusion cathode for anion exchange membrane water electrolysis hydrogen production and a preparation method of the gas diffusion cathode. The gas diffusion cathode is composed of a hydrophobic conductive substrate such as carbon paper or carbon cloth and the like and a catalytic layer, and the catalytic layer takes nickel-based non-noble metal powder and at least one of alloys or derivatives of the nickel-based non-noble metal powder and the alloys as catalytic active components. One or more of carbon powder, carbon nanotubes, carbon nanofibers, graphene, nano graphite powder and the like are used as conductive agents, and polytetrafluoroethylene, polyvinylidene fluoride or perfluorosulfonic acid resin is used as binding agents, so that the gas diffusion cathode is formed. According to the gas diffusion cathode for anion exchange membrane water electrolysis hydrogen production, nickel-based non-noble metal active components are deposited on a conductive substrate of a porous composite structure, the preparation process is simple, an electrode with a uniform catalyst can be obtained, and compared with the similar technology, the gas diffusion cathode has the obvious advantages of high catalyst utilization rate and high current density; the cathode is applied to various water electrolysis electrochemical reduction reactors or electrolytic tanks.

The invention provides a composite proton exchange membrane, a preparation method thereof and a proton exchange membrane fuel cell. The composite proton exchange membrane comprises reinforced base cloth and modified perfluorinated sulfonic acid resin layers arranged on the surfaces of the two sides of the reinforced base cloth. The modified perfluorinated sulfonic acid resin layer is doped with a modifier, and the modifier comprises heteropoly acid and sulfonated polyether-ether-ketone. The heteropoly acid and the sulfonated polyether ether ketone are introduced at the same time, and the heteropoly acid can adsorb more water molecules, so that the water retention capacity of the membrane at high temperature and low humidity is improved; sulfonated polyetheretherketone can quickly transfer protons, increase the total number of ion transfer groups in the membrane and improve the conductivity of the membrane; the glass transition temperature of the sulfonated polyetheretherketone is high, and the sulfonated polyetheretherketone also has better stability at high temperature; therefore, the electrical properties of the composite proton exchange membrane are greatly improved through the synergistic cooperation of the two components, and the composite proton exchange membrane also has extremely high conductivity even in a high-temperature and low-humidity environment. The fuel cell prepared on the basis of the composite material shows extremely high electrical properties.

The invention relates to a solid acid catalyst for propylene oligomerization and a preparation method and application thereof, and belongs to the technical field of propylene oligomerization catalysis. In order to solve the problems of low reaction efficiency, low selectivity, uncontrollable reaction and easy inactivation of the catalyst in the process for preparing dodecene by oligomerization of propylene, the invention provides a solid acid catalyst which takes mesoporous silica as a carrier and loaded perfluorosulfonic acid as an active center, and the loading capacity of the perfluorosulfonic acid is 5-40wt%. The amount and activity of the acid are adjusted by adjusting the loading amount of the perfluorosulfonic acid, active sites are uniformly distributed, the operability is high, the catalyst shows good propylene conversion rate and dodecene selectivity under the mild conditions of 90 DEG C and 2.0 MPa, the thermal stability is excellent, the catalyst still has good selectivity and conversion rate after being repeatedly used for four times, and the catalyst shows excellent stability. The solid acid catalyst provided by the invention can be regenerated through nitric acid protonation, the problem that the solid acid catalyst is easy to inactivate is solved, and the solid acid catalyst is green and environment-friendly.

The present invention discloses a method for preparing a catalytic layer for a fuel cell, comprising the following steps: preparing a pore-forming agent solution, wherein the pore-forming agent solution comprises a perfluorosulfonic acid resin, a first solvent, and a pore-forming agent; spraying the pore-forming agent solution onto both sides of a proton exchange membrane according to a network path to form a network of protruding pore-forming agent layers; coating the pore-forming agent layer with a catalyst slurry to form a catalyst layer; and first drying at 30-50°C and then drying at 100-150°C to obtain the catalytic layer for a fuel cell. The present invention also provides a catalytic layer for a fuel cell and a fuel cell. The preparation method provided by the present invention, by pre-spraying a layer of pore-forming agent slurry, not only solves the membrane swelling problem, but also enables the catalyst layer to form regular cracks, can alleviate the volume change problem during repeated charge and discharge, and improve the durability of the fuel cell membrane electrode.

The application discloses a PEM water electrolysis hydrogen production membrane electrode and a preparation method thereof, and relates to the technical field of water electrolysis hydrogen production. The PEM water electrolysis hydrogen production membrane electrode comprises a proton exchange membrane and cathode and anode catalyst layers located on both sides of the proton exchange membrane, wherein the cathode catalyst layer and the anode catalyst layer both comprise a catalyst, a perfluorosulfonic acid ionomer, a solvent and a perfluorosulfonic acid ionomer dispersion promoter; and the perfluorosulfonic acid ionomer dispersion promoter is at least one of dimethyl sulfoxide, tetrahydrofuran and N-methyl pyrrolidone. The PEM hydrogen production membrane electrode catalyst layer prepared by the application has the dispersion promoter of the ionomer added, the dispersion degree of the ionomer in the catalyst layer is increased, a good catalyst / ionomer microporous structure catalyst layer is constructed, the transmission resistance of the gas and water is reduced, and the performance of the membrane electrode is improved. The preparation method adopted by the application does not need special treatment process and equipment, is simple and fast in operation, and is easy to realize batch production.

The invention discloses a heat-resistant stable perfluorosulfonic acid composite proton exchange membrane and a preparation method thereof, and relates to the technical field of proton exchange membranes. The perfluorosulfonic acid composite proton exchange membrane is composed of a perfluorosulfonic acid resin base membrane and a composite layer, the composite layer comprises aramid nanofiber (ANF), graphene oxide, sulfonated graphene and a core-shell structure inorganic phase (silicotungstic acid (at) SiO2), and a three-dimensional cross-linked network is formed through a gradient heat treatment process; and coating a perfluorosulfonic acid resin base membrane with the membrane casting solution, and carrying out gradient heat treatment after stepped drying to prepare the perfluorosulfonic acid composite proton exchange membrane. The perfluorosulfonic acid composite proton exchange membrane researched and developed by the invention solves the problems of mechanical strength attenuation and insufficient ion selectivity of a traditional proton exchange membrane in a high-temperature and high-humidity environment, and is suitable for energy equipment such as a fuel cell and a flow battery.

The invention discloses a negative-pressure-resistant enhanced PFA (Polyfluoroalkoxy) lining pipeline material and a manufacturing process thereof. The material comprises the following components in parts by weight: 100 parts of PFA resin, 1-10 parts of fluorinated nanofiller, 5-15 parts of perfluorinated sulfonic acid resin and 8-35 parts of an expanded polytetrafluoroethylene fiber skeleton. The material has a multi-scale reinforced structure: an expanded polytetrafluoroethylene skeleton is embedded into a PFA matrix to form a macroscopic reinforced structure, the perfluorinated sulfonic acid resin is attached to the surface of the skeleton to form an interface compatibilization layer, and the fluorinated nano filler is dispersed in the matrix to form a nano reinforced phase. The process comprises the steps of skeleton plasma activation and interface compatibilization treatment, nano filler and PFA melt blending, pressure forming, heat treatment and the like. The mechanical strength, creep resistance and negative pressure resistance of the PFA lining material are remarkably improved, and the PFA lining material is suitable for the fields of chemical engineering, pharmacy, semiconductors and the like.

The invention provides a proton exchange membrane and a preparation method and equipment thereof.The proton exchange membrane comprises at least two membrane layers which are arranged in a stacked mode, side chain structures of perfluorinated sulfonic acid resin in the at least two membrane layers are the same, and the side chain structures of perfluorinated sulfonic acid resin in the at least two membrane layers are identical from one side of the proton exchange membrane to the other side of the proton exchange membrane. The equivalent mass of the perfluorinated sulfonic acid resin in the at least two film layers is gradually reduced in sequence; and / or the equivalent masses of the perfluorinated sulfonic acid resins in the at least two membrane layers are the same, and the molar masses of side chains of the perfluorinated sulfonic acid resins in the at least two membrane layers are sequentially increased from one side of the proton exchange membrane to the other side of the proton exchange membrane. According to the proton exchange membrane, the conductivity of the membrane layers is gradually increased from one side of the proton exchange membrane to the other side of the proton exchange membrane, so that the proton dragging capability of the cathode can be improved, the proton transmission resistance of the proton exchange membrane is reduced, and meanwhile, the stability of the proton exchange membrane is ensured.

The invention belongs to the field of lithium ion batteries, and particularly relates to a semi-solid lithium battery diaphragm and a preparation method thereof.The semi-solid lithium battery diaphragm comprises a base membrane and gradient functional coatings coated on the two sides of the base membrane, the base membrane is a polyimide membrane, and each gradient functional coating comprises a bonding layer on the bottom layer, a regulating layer on the surface layer and a filling layer located between the bonding layer and the regulating layer; the bonding layer comprises a component A, and the component A comprises a polymer matrix, a disulfide bond-containing cross-linking agent, a coupling agent and a first solvent; the polymer matrix comprises polyimide and polyurethane; the filling layer comprises a component B and a component A, and the component B comprises core-shell particles and a dispersing agent, wherein the core-shell particles are formed by coating Li1. 3Al0. 3Ti1. 7 (PO4) 3 particles with ZrO2; the regulation and control layer comprises perfluorinated sulfonic acid resin, a plasticizer, an interface stabilizer, a second solvent and deionized water. Through the synergistic effect of all the layers in the gradient functional coating, the self-repairing performance of a damaged interface of the diaphragm can be achieved, and the strength of the diaphragm is improved.

The invention provides a catalyst coating proton membrane and a preparation method thereof, a membrane electrode and a fuel cell, and belongs to the technical field of fuel cells, the catalyst coating proton membrane comprises a proton exchange membrane and a catalytic material coating attached to the proton exchange membrane; the preparation slurry of the catalytic material coating comprises graphene aerogel, a catalyst, perfluorinated sulfonic acid resin and a dispersing solvent; the doping amount of the graphene aerogel in the preparation slurry of the catalytic material coating is 1-3wt%. By coupling the characteristics of the graphene carbon aerogel, the catalyst and the perfluorosulfonic acid resin, the rapid dynamic response of the fuel cell to the variable load is realized, and the dynamic response problem is solved from the membrane electrode level.

The invention belongs to the technical field of preparation of perfluorosulfonic acid proton exchange membranes, and particularly relates to a preparation process of a composite enhanced perfluorosulfonic acid proton exchange membrane. The preparation process comprises the following steps: (1) preparing a first polytetrafluoroethylene substrate film; (2) preparing a membrane preparation solution; and (3) coating a glass plate with the membrane-making liquid, flatly covering the membrane-making liquid with a first polytetrafluoroethylene substrate membrane, coating the first polytetrafluoroethylene substrate membrane with the membrane-making liquid again, and finally carrying out heat treatment and post-treatment to prepare the composite enhanced perfluorosulfonic acid proton exchange membrane. According to the preparation process of the composite enhanced perfluorosulfonic acid proton exchange membrane, the first polytetrafluoroethylene substrate membrane and the perfluorosulfonic acid resin membrane preparation liquid have a synergistic effect, and the interfacial compatibility of the first polytetrafluoroethylene substrate membrane and the perfluorosulfonic acid resin membrane preparation liquid is improved; the finally prepared composite enhanced perfluorosulfonic acid proton exchange membrane has excellent mechanical strength, proton conduction effect and capability of inhibiting gas permeation.

This application discloses a crown ether modified perfluorosulfonic acid resin, its preparation method, its application, and an ion exchange membrane. The main chain of the crown ether modified perfluorosulfonic acid resin is a perfluorocarbon chain. The crown ether modified perfluorosulfonic acid resin includes repeating unit A, which is shown in formula (1): Formula (1); In formula (1), R0 is a crown ether group, a is a positive integer from 0 to 6, and b is a positive integer from 2 to 5. This application can effectively improve the persistence of the ion exchange membrane's free radical quenching effect, while also improving the oxygen resistance of the ion exchange membrane.

The invention particularly discloses a preparation method and application of a composite ion exchange membrane. The composite ion exchange membrane is prepared from the following components in parts by weight: 95 to 110 parts of perfluorinated sulfonic acid resin, 5 to 8 parts of functionalized multi-walled carbon nanotubes, 10 to 15 parts of phosphotungstic acid, 1 to 1.8 parts of cerium-tannin complex, 12 to 20 parts of polyphenylene sulfide enhanced net, 30 to 40 parts of sulfonated polyether ether ketone solution, 3 to 5 parts of MXene-silicotungstic acid compound and 1 to 3 parts of polyethyleneimine cross-linking agent. The preparation method comprises the following steps: preparing the functionalized multi-walled carbon nanotube and the cerium-tannin complex; blending the perfluorinated sulfonic acid resin and the functional filler to prepare a membrane casting solution, and coating to form a membrane; a PPS reinforced net and an SPEEK solution are subjected to composite reinforcement, the PPS reinforced net and the SPEEK solution are subjected to PEI crosslinking and then superposed with the membrane, an MXene-silicotungstic acid compound is sprayed on the surface, and the composite ion exchange membrane is obtained through hot pressing and acid activation, has high proton conductivity and excellent mechanical strength and chemical stability and can be applied to a proton exchange membrane electrolytic cell and an all-vanadium redox flow battery.

The invention belongs to the technical field of silicone rubber, and particularly discloses hydrophobic conductive liquid silicone rubber and a preparation method thereof. The liquid silicone rubber comprises a component A and a component B, the component A comprises addition type liquid silicone rubber base rubber and a platinum catalyst, and the component B comprises vinyl silicone oil, hydrogen-containing silicone oil, an inhibitor, a Nafion solution and fibrous silver-coated glass powder. According to the invention, fibrous silver coated glass powder is introduced into the component B as a conductive filler, and a Nafion solution is used for surface modification of the conductive filler, so that a conductive network with high efficiency and low percolation threshold is constructed, and the interfacial compatibility of the filler and a silicone rubber matrix is also significantly improved; the perfluorosulfonic acid structure of Nafion not only enhances the interaction with the silver surface, but also endows the surface of the material with the low-energy characteristic, and synergistically realizes high conductivity and high hydrophobicity. The hydrophobic conductive liquid silicone rubber disclosed by the invention not only has excellent hydrophobicity and conductivity, but also has excellent mechanical properties.

A proton exchange membrane for an energy conversion device, a hydrogen fuel cell stack for a vehicle, and a method for producing a proton exchange membrane. The proton exchange membrane contains a first layer of a perfluorosulfonic acid ionomer. Furthermore, the perfluorosulfonic acid ionomer contains a first additive coated with methoxy nonfluorobutane. The hydrogen fuel cell stack comprises one or more membrane electrode assemblies, each containing a proton exchange membrane.

The utility model provides a fuel cell membrane electrode. The fuel cell membrane electrode comprises a first gas diffusion layer, a first catalyst layer, a first perfluorinated sulfonic acid resin layer, a proton exchange membrane layer, a second perfluorinated sulfonic acid resin layer, a second catalyst layer and a second gas diffusion layer which are connected in sequence. According to the fuel cell membrane electrode provided by the utility model, the use amount of platinum can be reduced under the condition that the performance of the fuel cell is not reduced, so that the cost of platinum in the fuel cell is reduced.