35results about How to "Improve proton conductivity" patented technology

The invention provides a proton exchange membrane, a preparation method thereof and a fuel cell, and relates to the technical field of fuel cells. The proton exchange membrane comprises a base material with a porous structure, pores of the base material contain active components, and the active components comprise a heteropolyacid modified MOF material and sulfonated polyfluorene biphenyl indole; the weight ratio of the heteropoly acid to the MOF material is 1: (1-3). The proton exchange membrane provided by the invention has the characteristics of excellent mechanical durability, high proton conductivity and ultra-thinness, and can improve the mechanical strength, ductility and chemical stability of the membrane while reducing the expansion of the membrane.

This invention discloses a method for preparing a Pt / C catalyst by vacuum impregnation with an ionic liquid and its application. First, a carbon support is mixed with water and alcohol, ball-milled, and then mixed with nitric acid to obtain an acid-treated carbon support. Next, a precursor solution is prepared by mixing a platinum salt, an organic solvent, a surfactant, and water, and then an imidazole ionic liquid is added to it in portions to obtain a precursor solution containing the ionic liquid. This solution is mixed with the acid-treated carbon support and vacuum ball-milled to obtain a mixed slurry. This slurry is then vacuum freeze-dried to obtain a freeze-dried powder. Reduction and heat treatment are then performed to obtain the ionic liquid-doped Pt / C catalyst. The catalyst is then coated onto both sides of a proton exchange membrane to form a catalytic layer. Through this method, this invention not only effectively inhibits the aggregation, migration, and ripening of platinum particles during electrochemical processes, thereby significantly improving the catalyst's durability, but also enhances the catalyst's proton conductivity under low humidity conditions.

The invention relates to a nitro-containing carbon chain polymer, a polymer binder, a polymer film and application of the nitro-containing carbon chain polymer, the nitro-containing carbon chain polymer is prepared by Friedel-Crafts reaction of raw materials such as a nitrogen heterocyclic monomer, an aromatic monomer and a nitro-containing ketone monomer, and the nitro-containing carbon chain polymer contains nitro, so that free radicals can be quenched, and the nitro-containing carbon chain polymer can be used as a polymer binder. The free radical resistance of the polymer is improved, so that the damage of hydroxyl radicals to the polymer is relieved, and the stability of the polymer is improved. The ion exchange membrane or ionomer adhesive prepared from the nitro-containing carbon chain polymer has excellent free radical resistance.

The invention relates to a preparation method of a multifunctional composite proton exchange membrane, and aims to design a special membrane for electrochemical equipment such as a fuel cell and a water electrolysis device so as to improve the proton conduction efficiency and chemical stability of the electrochemical equipment. In an experiment, the polyether sulfone proton exchange membrane is prepared through an optimized electrostatic spinning process, and nanofibers with a high specific surface area and a specific pore structure are formed, so that the proton exchange capacity and the mechanical stability of the membrane are enhanced. The invention also covers a preparation method of the membrane, in which sulfonated polyethersulfone is dissolved in a suitable solvent, a nanofiller and a suitable tackifier are added, electrostatic spinning is carried out by adjusting parameters such as voltage, flow rate and collection distance, and then heat treatment and chemical treatment steps are carried out to optimize the performance of the membrane. The preparation method is characterized in that the mechanical strength, the chemical stability and the proton conductivity of the membrane are remarkably improved by applying an electrostatic spinning technology and adding a modified material, and the membrane can keep excellent performance even under harsh operation conditions, so that the membrane becomes an ideal choice for high-efficiency electrochemical application. According to the invention, the performance and the stability of the electrochemical equipment are obviously improved, and important technical support is provided for promoting the development and the application of the electrochemical field.

The invention discloses a porous polybenzimidazole / proton conductor type polyamide composite ionic membrane as well as a preparation method and application thereof, and belongs to the technical field of polymer electrolyte membranes. The preparation method specifically comprises the following steps: blending proton conductor type polyamide, polybenzimidazole and an organic solvent to form a uniform system, then adding an organic pore-forming agent, pouring the volatile solvent to form a membrane, and finally soaking in acid liquor to obtain the porous polybenzimidazole / proton conductor type polyamide composite ionic membrane. The proton conductor type polyamide synthesized by the invention has certain proton conductivity, and the intrinsic proton conductivity of the ionic membrane can be improved by adding the proton conductor type polyamide into the polybenzimidazole ionic membrane instead of more dependence on adsorption of acids (including phosphoric acid, sulfuric acid and the like). Besides, due to the addition of the triethanolamine pore-forming agent, a tiny and disconnected porous structure can be formed in the ionic membrane, and higher acid absorption is obtained on the premise of ensuring the air tightness and high vanadium resistance of the ionic membrane, so that higher proton conductivity is obtained.

The invention belongs to the technical field of fuel cell proton exchange membranes, and discloses a cross-linking type polybenzimidazole proton exchange membrane with oxidation resistance and high proton conductivity and a preparation method of the cross-linking type polybenzimidazole proton exchange membrane. According to the cross-linking type polybenzimidazole, after polymerization of raw material monomers is completed, a silane coupling agent is added as a cross-linking agent, and polybenzimidazole containing the cross-linking agent is obtained through reaction. The polybenzimidazole containing the cross-linking agent can be prepared into a cross-linking type polybenzimidazole proton exchange membrane by using a solution casting method. According to the cross-linked polybenzimidazole disclosed by the invention, a stable and uniform Si-O-Si cross-linked network is constructed by adding the cross-linking agent and taking a hydroxyl group on the polybenzimidazole as a main reaction site, so that synchronous improvement of antioxidant stability and proton conductivity is synergistically realized. The polybenzimidazole proton exchange membrane containing the cross-linking agent has a good application prospect in the aspect of proton exchange membrane fuel cells.

[Task] Provided is an electrochemical cell, a power generation method using the electrochemical cell, and a manufacturing method of a hydrogen gas using the electrochemical cell that are suitable for the use in a temperature range between 200°C and 600°C. [Solution] A fuel cell 1 (electrochemical cell) includes a proton conductor 5 represented by (Li, H)14-2xZn1+x(GeO4)4 where a portion of lithium ions of Li14-2xZn1+x(GeO4)4 where x is a number equal to or more than 0 is substituted with protons, the proton conductor having electric conductivity of 0.01 S / cm or more at 300°C, an anode 6 provided on one side of the proton conductor, a cathode 7 provided on another side of the proton conductor, a first separator 9 provided on an anode side of the proton conductor to define an anode chamber 8, and a second separator 12 provided on a cathode side of the proton conductor to define a cathode chamber 11.

The invention discloses a cross-linked polymer-molecular cluster non-fluorine composite proton exchange membrane and a preparation method and application thereof, the cross-linked polymer-molecular cluster non-fluorine composite proton exchange membrane is mainly prepared from branched polyethyleneimine (PEI), polyvinyl chloride (PVC) and phosphotungstic acid (PW12), quaternized PEI and PVC are subjected to a cross-linking reaction, and then the prepared membrane is immersed in a PW12 solution to prepare the cross-linked polymer-molecular cluster non-fluorine composite proton exchange membrane. Wherein the mass ratio of the PEI to the PVC can be adjusted as required, the mass fraction of the PW12 solution is preferably 5-20%, the proton exchange membrane has good mechanical properties, thermal stability and excellent proton conductivity, and the preparation method is simple, low in cost and environmentally friendly.

The invention relates to an ionic liquid covalently grafted hexagonal boron nitride composite proton exchange membrane as well as a preparation method and application thereof. The ionic liquid covalently grafted hexagonal boron nitride composite proton exchange membrane is prepared from the following raw materials: Nafion resin and ionic liquid covalently grafted hexagonal boron nitride. The ionic liquid in the ionic liquid covalently grafted hexagonal boron nitride can convey protons to adjacent proton acceptors to complete proton conduction, so that the electrochemical performance of the composite membrane is improved; hexagonal boron nitride can improve the mechanical property and stability of the proton exchange membrane, through covalent grafting with the ionic liquid, uniform dispersion of hexagonal boron nitride nanosheets in a polymer matrix can be improved, the overall uniformity of the proton exchange membrane is improved, and meanwhile, the problem of unstable membrane performance caused by leaching of the ionic liquid is avoided; the proton conductivity, the mechanical strength, the antioxidant stability and the thermal stability of the proton exchange membrane are improved.

The invention discloses a sulfonated fluorine-containing polyimide-metal organic framework composite membrane as well as a preparation method and application thereof, and belongs to the technical field of all-vanadium redox flow battery diaphragms. The method comprises the following steps: synthesizing sulfonated fluorine-containing polyimide FSPI by using a high-temperature one-step method; preparing a metal organic framework MIL-101 (Cr) by adopting a hydrothermal method; the preparation method comprises the following steps: preparing a metal organic framework alpha-Fe2O3 / MIL-101 (Cr) by adopting a hydrothermal method; and preparing the sulfonated fluorine-containing polyimide-metal organic framework composite membrane FSPI / alpha-Fe2O3 / MIL-101 (Cr) by adopting a tape casting method. An ion transmission channel is regulated and controlled by introducing a metal organic framework alpha-Fe2O3 / MIL-101 (Cr) into sulfonated fluorine-containing polyimide. And the regulated ion transmission channel is larger than hydrated protons (lt, 0.24 nm) and smaller than hydrated vanadium ions (gt, 0.6 nm), so that the ion selectivity of the sulfonated fluorine-containing polyimide diaphragm is improved. The composite membrane prepared by the invention has high proton conductivity, good vanadium resistance and excellent ion selectivity. When the prepared composite membrane is used in the all-vanadium redox flow battery, the cycling stability of the battery is improved.

The invention discloses a composite proton exchange membrane and a preparation method thereof, the composite proton exchange membrane comprises a base membrane, a first coating and a second coating, the first coating and the second coating are coated on two sides of the base membrane, the first coating comprises polyvinyl alcohol and perfluorinated sulfonic acid resin, and the second coating comprises polyvinyl alcohol and perfluorinated sulfonic acid resin. The thickness of the composite proton exchange membrane is 20-80 [mu] m, the thickness of the first coating is 2-38 [mu] m, and the thickness of the second coating is 2-38 [mu] m. According to the invention, the base membrane is used as a supporting material, relatively high mechanical properties are provided, a proton transmission channel is provided through the polyvinyl alcohol composite perfluorosulfonic acid, and extremely strong hydrogen bond interaction exists between molecules and in molecules of polyvinyl alcohol, so that the membrane has excellent proton conduction performance, and the performance of the membrane is improved. Meanwhile, due to the introduction of polyvinyl alcohol, the perfluorosulfonic acid and the base membrane have good binding capacity. The barrier property of the composite proton exchange membrane on hydrogen permeation is synergistically improved.

This invention discloses a PPTA-modified perfluorosulfonic acid proton exchange membrane and its preparation method. The PPTA-modified perfluorosulfonic acid proton exchange membrane has a layered structure, with the middle layer being a mixture of perfluorosulfonic acid polymer and PPTA. The preparation method of the perfluorosulfonic acid polymer and PPTA mixture includes: mixing a pore-forming agent, PPTA resin, and concentrated sulfuric acid, stirring until the pore-forming agent and PPTA resin are uniformly dispersed in the concentrated sulfuric acid, and then vacuum degassing to obtain a PPTA porous casting solution; coating the PPTA porous casting solution onto a substrate, immersing it in pure water, and after solidification, peeling it off from the substrate, and then immersing it in ultrafiltration water to obtain a PPTA porous membrane; immersing the PPTA porous membrane in the perfluorosulfonic acid casting solution, and then drying it to obtain the perfluorosulfonic acid polymer and PPTA mixture layer. The perfluorosulfonic acid polymer and PPTA mixture layer can improve the thermal stability, mechanical strength, and swelling resistance of the membrane, and also has the advantage of reducing methanol permeability. It also increases the proton conductivity of the composite membrane.

This invention discloses a method for preparing an aramid nanofiber-reinforced perfluorosulfonic acid proton exchange membrane, comprising the following steps: S1, mixing aramid nanofibers, a membrane-forming solvent, potassium tert-butoxide, and methanol to obtain an aramid nanofiber dispersion; S2, mixing the aramid nanofiber dispersion and a perfluorosulfonic acid solution, stirring, and degassing to obtain a first mixed solution; S3, mixing the first mixed solution and a coagulant to obtain a second mixed solution, and coating the mixture to obtain a composite membrane; S4, allowing the composite membrane to stand, drying, and annealing to obtain an aramid nanofiber-reinforced perfluorosulfonic acid proton exchange membrane precursor; S5, post-processing the aramid nanofiber-reinforced perfluorosulfonic acid proton exchange membrane precursor to obtain the aramid nanofiber-reinforced perfluorosulfonic acid proton exchange membrane. The introduction of aramid nanofibers in this invention improves the mechanical stability, ion exchange capacity, water absorption swelling rate, and proton conductivity of the aramid nanofiber-reinforced perfluorosulfonic acid proton exchange membrane.

The invention provides carboxyl porphyrin-containing catalyst slurry as well as a preparation method and application thereof, and relates to the field of proton exchange membrane fuel cells. The catalyst slurry containing carboxyl porphyrin comprises a carboxyl porphyrin compound, a platinum-based catalyst, a perfluorosulfonic acid electrolyte, water and alcohol. The carboxyl porphyrin compound provided by the invention has a double-effect synergistic effect of an oxygen adsorption effect and a proton transfer effect in a platinum-based catalyst, so that the activity of a fuel cell is improved; and through interaction with a sulfonic acid group in an electrolyte, the carboxyl can weaken the poisoning effect of the sulfonic acid group on the platinum catalyst, so that the high activity of the platinum catalyst is maintained, meanwhile, proton transmission is accelerated, and the overall performance of the fuel cell is improved. According to the carboxyl metalloporphyrin-assisted platinum-based catalyst, the power density and the mass activity of a fuel cell are remarkably improved, the use amount of noble metal is reduced, and a wide application prospect is shown.

This invention discloses a polyaromatic hydrocarbon for preparing proton exchange membranes, its preparation method, and its application, belonging to the field of proton exchange membrane material preparation technology. This invention solves problems such as low molecular weight, uneven sulfonation, chain breakage in sulfonated polymers, poor dimensional stability, and poor mechanical properties in proton exchange membrane materials. Using aromatic monomers and 3,5-difluorotrifluoroacetophenone as raw materials, this invention employs a superacid-catalyzed Friedel-Crafts hydroxyalkylation reaction to prepare fluorinated aromatic polymers. Then, sulfonic acid groups are introduced onto the fluorinated aromatic polymers via nucleophilic substitution followed by sulfonation, preparing monosulfonated and disulfonated fluorinated sulfonic acid polymers. Proton exchange membranes are then prepared using these polymers as raw materials. The significant polarity difference between the hydrophobic fluorinated benzene ring side groups and the hydrophilic disulfonic acid groups in this invention is more conducive to forming a microphase separation structure and constructing continuous proton transport channels. Simultaneously, the hydrophobic fluorinated segments effectively suppress membrane swelling and improve its dimensional stability.

The present invention discloses a composite proton exchange membrane and its preparation method and application, belonging to the field of new energy fuel cell technology. The method comprises the following steps: 1) preparing a proton conductor composed of iodine niobium oxide HNbO(IO3)4, boron phosphate BPO4 and inorganic oxide MO2; 2) mixing the proton conductor prepared in step 1 with a polymer matrix solution and forming a membrane by a casting method; 3) soaking in phosphoric acid to obtain a phosphoric acid-doped proton exchange membrane. Compared with the prior art, the composite proton exchange membrane prepared by the present invention has a higher proton conductivity at 100-200°C, a stronger phosphoric acid retention capacity, and the battery based on membrane assembly can operate stably at 100-200°C.

The embodiment of the invention provides a polymer, a preparation method and application thereof. Relates to the technical field of multi-metal oxygen cluster hybrid materials. The polymer comprises a single-vacancy polyoxometalate, transition metal ions and a nitrogen-containing polymer, the transition metal ions are complemented to gaps of the single-vacancy polyoxometalate to form covalent bonds with oxygen atoms, and the transition metal ions are connected with N atoms in the nitrogen-containing polymer through covalent bonds. PEM prepared from the polymer has relatively high water absorption and proton conductivity, and is easily dissolved in an organic solvent.

The invention discloses a composite membrane for a high-temperature proton exchange membrane fuel cell as well as a preparation method and application of the composite membrane. According to the composite membrane, polybenzimidazole (PBI) is used as a matrix, chloromethylated polysulfone (CMPSF) is introduced as a covalent cross-linking agent and reacts with imidazole groups in the PBI to form a three-dimensional covalent cross-linked network, and the mechanical strength and dimensional stability of the membrane are remarkably improved; meanwhile, a nitrogen-rich ionic polymer (NIP) synthesized by a specific precursor is introduced, and rich basic nitrogen sites of the NIP can form strong hydrogen bond interaction with phosphoric acid, so that the phosphoric acid adsorption and retention capability of the membrane is greatly enhanced, and additional proton jump sites are provided. Through the synergistic effect, the proton conductivity of the composite membrane exceeds 160 mS cm <-1 >, the tensile strength exceeds 10 MPa and the peak power density reaches 1000 mW cm <-2 > magnitude under the conditions of 160 DEG C and no water, and the composite membrane has excellent long-term stability. According to the invention, the contradiction between the mechanical property and proton conductivity of the traditional phosphoric acid doped PBI membrane is effectively solved, and a reliable electrolyte material is provided for a high-performance and long-life high-temperature proton exchange membrane fuel cell.

[Problem] Developed is a polymer electrolyte membrane having excellent proton conductivity even under low-humidity conditions, and having excellent mechanical strength and chemical stability. [Solution] A polymer electrolyte membrane containing a block copolymer having one or more ionic segments and one or more nonionic segments, wherein the ion exchange capacity (meq / g) of the block copolymer is more than 2.0 and less than 3.1, wherein the polymer electrolyte membrane has a co-continuous phase-separation structure, wherein the average period size (nm) of the co-continuous phase-separation structure is less than 110 nm as observed by transmission electron microscopy, and wherein the average period size (nm) of the co-continuous phase-separation structure and the ion exchange capacity (meq / g) satisfy the relation of: average period size (nm) / ion exchange capacity (meq / g) > 21.

This invention discloses a method for preparing a polybenzimidazole membrane regulated by a grafting and crosslinking strategy, comprising the following steps: First, at a temperature of 60-100°C, a polybenzimidazole compound is dissolved in a first solvent, a solution containing a quaternary ammonium salt grafting agent is added, and the mixture is sonicated to obtain grafted polybenzimidazole powder; Second, the grafted polybenzimidazole powder obtained in the first step is dissolved in a second solvent, and sonicated at a temperature of 40-80°C for 0.1-2 h, a sulfonating agent is added dropwise, and the mixture is sonicated until homogeneous to obtain a sulfonated polybenzimidazole casting solution; Third, the mixture is dried to obtain a polybenzimidazole membrane regulated by the grafting and crosslinking strategy. The grafted and crosslinked polybenzimidazole membrane prepared by the method of this invention exhibits ideal proton conductivity, high selectivity, and chemical stability, which is of great significance for promoting the large-scale application of polybenzimidazole membranes in vanadium redox flow batteries.

The present invention discloses a method for preparing a two-dimensional material composite proton exchange membrane for hydrogen isotope separation, comprising the following steps: (1) preparing a PFSA type polymer solution; (2) preparing a nanosheet dispersion; (3) preparing a composite proton exchange membrane: adding the nanosheet dispersion to the PFSA type polymer solution, mixing evenly, pouring the nanosheet dispersion into a mold under heating conditions and standing to form a membrane, finally cooling to room temperature, and taking out the formed membrane, which is the two-dimensional material composite proton exchange membrane for hydrogen isotope separation. The two-dimensional material composite proton exchange membrane prepared by the present invention has good mechanical properties and hydrogen isotope screening ability, and can be applied to a proton exchange membrane (PEM) electrolyzer to significantly reduce the energy consumption of electrolytic separation of protium and tritium, and improve the protium and tritium separation coefficient.

The invention discloses a method for preparing a hydrogel electrolyte with a wide voltage window by regulating a polyacid, wherein phosphotungstic acid is dispersed in a matrix of polyvinyl alcohol-polyethylene glycol to prepare PW 12 ‑PVA‑PEG‑hydrogel electrolyte, using PW 12 The higher hydrogen evolution reaction overpotential can broaden the voltage window of the electrolyte, while using PW 12 The "proton sponge" property of the gel electrolyte is used to ensure high ionic conductivity, while also extending the mechanical properties. This method has a simple preparation process, high material preparation repeatability, low equipment requirements, and the chemicals used are cheap and readily available, so it has broad prospects in industrial applications.

The present invention relates to the manufacture of hydrophobic dual emulsions (hydrophobic bio-binders) to be integrated into bio-cathode inks to provide cathode ink formulations for hydrophobic bio-cathodes.

The invention belongs to the technical field of fuel cell proton exchange membranes, and discloses a PBI-SO2-Cl / UiO-66-NH2 (at) CNT composite proton exchange membrane and a preparation method thereof. According to the PBI-SO2-Cl / UiO-66-NH2-coated CNT proton exchange membrane disclosed by the invention, UiO-66-NH2-coated CNT is stably fixed into a PBI-SO2-Cl polymer through a covalent bond, a sulfonyl chloride group in the PBI-SO2-Cl and an amino group in the UiO-66-NH2-coated CNT form a sulfonyl imide group, chemical crosslinking is enhanced, and UiO-66-NH2 grows on CNT-COOH, so that particles in a free state are greatly reduced, loss of the particles is inhibited, and the proton exchange membrane has the advantages that the proton exchange membrane has a good proton exchange effect on the CNT-COOH and the UiO-66-NH2-coated CNT proton exchange membrane is prepared. The stability and proton conductivity of the composite membrane are enhanced, and the proton exchange membrane has a good application prospect in the aspect of high-temperature proton exchange membrane fuel cells.

The application provides a carbon nanotube composite anti-poisoning cathode catalytic layer and a preparation method and application thereof. The cathode catalytic layer comprises a three-dimensional porous framework formed by carbon nanotube composites interwoven and jointed with each other, the carbon nanotube composite comprises multi-walled carbon nanotubes and an ionomer, the ionomer is uniformly dispersed on the outer wall of the multi-walled carbon nanotubes; a catalyst is distributed on the surface and inside of the three-dimensional porous framework; the tube diameter of the multi-walled carbon nanotubes is 40nm-80nm; the porosity of the catalytic layer is 50.4%-59.3%, and more than 95wt% of the ionomer contained is combined on the carbon nanotubes. The cathode catalytic layer of the application adopts large-diameter carbon nanotubes combined with ionomers, can significantly improve the proton conduction and oxygen transmission capacity of the cathode catalytic layer and reduce the poisoning effect of the ionomer on the catalyst, and enhance the effective efficiency and activity of the catalyst. In addition, the proton conduction capacity and operating power of the fuel cell under a high-temperature environment are enhanced.

The invention relates to the technical field of batteries, and provides a high-stability self-humidifying proton exchange membrane as well as a preparation method and application thereof. The high-stability self-humidifying proton exchange membrane is prepared from the following raw material components in parts by weight: 10 parts of sulfonated polyetheretherketone, 100 parts of perfluorinated sulfonic acid resin and 5 to 20 parts of ZrP / CeO2 composite material, the ZrP / CeO2 composite material comprises the following raw materials: zirconium phosphate and cerium oxide in a weight ratio of 1: (1-2). According to the technical scheme, the problems of relatively poor stability and relatively low proton conductivity of the proton exchange membrane in related technologies are solved.

The application relates to the technical field of polybenzimidazole, and discloses a polybenzimidazole copolymer, a novel proton exchange membrane and a preparation method and application thereof; the proton exchange membrane comprises a matrix and a proton active component; the matrix is a polybenzimidazole homopolymer; the proton active component is a polybenzimidazole copolymer; and the polybenzimidazole copolymer comprises a first structural unit and a second structural unit. The proton exchange membrane of the application adopts a polybenzimidazole homopolymer as the matrix, and simultaneously adopts a polybenzimidazole copolymer containing a nitrogen-containing heterocyclic structural unit as the proton active component, so that the proton exchange membrane of the application has higher acid loading capacity (especially phosphoric acid loading capacity) and proton conductivity, and simultaneously has good mechanical properties and dimensional stability.

The invention discloses a composite porous ion conducting membrane as well as a preparation method and application thereof, and belongs to the technical field of battery diaphragms. The composite porous ion conducting membrane comprises a polyolefin porous membrane supporting layer, a coating is compounded on the surface of one side of the polyolefin porous membrane supporting layer; the coating layer comprises a polybenzimidazole polymer; the polybenzimidazole polymer comprises a six-membered cycloalkane structure. In order to improve the selectivity of the polyolefin porous membrane, the surface of the polyolefin porous membrane is coated with a functional coating, and the composite porous ion conduction membrane with high selectivity, high conductivity and high stability is prepared.

This invention relates to the field of proton exchange membrane (PEM) preparation technology, and discloses a modified PAN and quercetin-doped sulfonated polyaryletherketone (PAEK) PEM, its preparation method, and its applications. The method includes the following steps: synthesizing sulfonated PAEK via monomer copolymerization; obtaining modified PAN by carboxyl modification of polyacrylonitrile (PAN); and then blending SPAEK, modified PAN, and quercetin to form a membrane. In this invention, the cyano groups of the modified PAN form an acid-base crosslinking network with the sulfonic acid groups of SPAEK to inhibit swelling, and its carboxyl groups participate in proton conduction; the polyphenolic hydroxyl groups of quercetin construct a hydrogen bond network to enhance structural density and act as a free radical scavenger to improve antioxidant stability. This invention, through the synergistic effect of the three components, successfully solves the technical problems of SPAEK membranes, such as difficulty in balancing proton conductivity and dimensional stability, and poor antioxidant performance. The resulting composite membrane possesses high proton conductivity, low swelling rate, and excellent oxidation stability, making it suitable for vanadium redox flow batteries.

The invention provides a high-proton-conduction and high-durability fuel cell proton membrane and a preparation method thereof, and belongs to the technical field of proton membranes. Comprising the following steps: S1, weighing a free radical quenching agent and a first solvent, stirring and mixing, and carrying out ultrasonic dispersion to obtain a first dispersion liquid; s2, weighing a stabilizer and a second solvent, stirring in a nitrogen protective atmosphere, then keeping stirring, carrying out microwave heating and reflux reaction, injecting the first dispersion liquid, and continuously mixing and stirring to obtain first sol; s3, dispersing the first sol and the ionomer solution through thin film shearing to obtain a to-be-coated film solution; s4, preparing the proton membrane with an enhancement layer from the membrane solution through a solution membrane forming method. The proton membrane preparation technology is simple and easy to operate, the equipment cost and the maintenance cost are low, and industrial continuous mass production is easy to achieve.