20results about How to "Improve proton conductivity" patented technology

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 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.

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 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.

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.

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 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.

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 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 application belongs to the technical field of metal organic framework material preparation, and particularly relates to a super-microporous Cr-MOF material, a preparation method thereof and proton conduction application. 15 H 11 Cr 3.5 O 16.5 X 3.5 , X is one of OH or Cl, the ligand is uniform benzene tetraformic acid, the three-dimensional structure contains gourd-shaped pore channels, the pore wall is rich in uncoordinated-COOH, X functional groups and coordinated water, is easy to form a continuous hydrogen bond network, realizes efficient proton conduction. The material has a thermal stability of 330 DEG C or above, and has excellent water and acid stability. The application is synthesized by a solvent-free mechanical grinding-thermal reaction method. The method does not need organic solvents, and is suitable for large-scale production. The material has excellent proton conduction performance, and is suitable for fields such as proton exchange membrane fuel cells.

The application discloses a reinforcing layer for a wide-temperature-range proton exchange membrane and a manufacturing method thereof, which comprises an ePTFE layer, nanofiber layers respectively formed on two sides of the ePTFE layer, and phytic acid adsorbed in the nanofiber layers; the phytic acid modified polymer nanofiber layer and the ePTFE layer are combined to form the reinforcing layer for the wide-temperature-range proton exchange membrane. The ePTFE layer has strong strength and stability, and can enhance the strength of the proton exchange membrane; the polymer layer which can be spun and has proton conduction capacity or has proton conduction capacity after post-modification is deposited on the ePTFE layer through the electrospinning technology, so that the proton conduction rate of the proton exchange membrane can be effectively improved; the reinforcing layer formed has high strength and high proton conduction capacity; and the proton exchange membrane prepared from the reinforcing layer can meet the use requirements in a high-temperature and low-humidity environment.

The application relates to the technical field of batteries, and discloses a proton exchange membrane, a preparation method thereof and a battery, wherein the proton exchange membrane comprises a perfluorosulfonic acid base, polymer fibers, a first reinforcing body and a second reinforcing body; the polymer fibers and the perfluorosulfonic acid base are crosslinked to form a crosslinked network through covalent bonds; the mass ratio of the polymer fibers to the perfluorosulfonic acid base is 5-10:1; the first reinforcing body is a zero-dimensional material or a one-dimensional material and is arranged in the polymer fibers in an axial direction; the mass ratio of the polymer fibers to the first reinforcing body is 100:1-10; the second reinforcing body is a two-dimensional material or a three-dimensional material with proton conduction capacity and is dispersedly distributed in the perfluorosulfonic acid base; and the mass ratio of the perfluorosulfonic acid base to the second reinforcing body is 100:1-10. Through the technical scheme, the proton conductivity, the mechanical property and the dimensional stability of the proton exchange membrane are simultaneously improved.

The application discloses a kind of double wide area-high acid retention gel state mixed matrix PBI proton exchange membrane and its preparation method and application, the gel state proton membrane is by flexible zirconium-glutamic acid (L-Glu-Zr (P)) or UiO-66 series metal organic framework, polybenzimidazole (PBI), phosphoric acid and water composition, its preparation method includes: with polyphosphoric acid as solvent, under the protection of inert gas, aromatic tetraamine monomer, dicarboxylic acid phenyl monomer high-temperature polycondensation forms PBI polymer solution, adds metal organic framework particle and disperses uniformly, mixed solution is scraped on substrate and experiences from solution to gel state membrane The phase transition process;Proton exchange membrane prepared in the application all shows excellent acid retention capacity, proton transport characteristics, fuel cell performance and stability under the service window of double wide area (temperature-20~240 DEG C, humidity 0~80%RH), has very good application prospect in fuel cell field.

This invention discloses a PPTA / PFSA blend proton exchange membrane, its preparation method, and its application. The preparation method of the PPTA / PFSA blend proton exchange membrane includes the following steps: Under a nitrogen or inert gas environment and with stirring, perfluorosulfonic acid is added in batches to a first membrane-forming solvent and stirred until homogeneous. Then, a co-solubilizing salt is added and stirred until homogeneous to obtain solution B. p-phenylenediamine is added to solution B at 10–15°C and stirred until homogeneous to obtain solution C. A terephthaloyl chloride solution is poured into solution C at -10–0°C to undergo a low-temperature reaction, resulting in solution D. Polyvinylpyrrolidone is added and stirred until homogeneous to obtain a casting solution, wherein terephthaloyl chloride is dissolved in a second membrane-forming solvent to form a terephthaloyl chloride solution. After degassing the casting solution, it is poured onto a substrate, coated, exposed to air for at least 10 seconds, and then immersed in water for phase inversion to form a membrane, thus obtaining a PPTA / PFSA blend proton exchange membrane on the substrate. The preparation method of this invention can simultaneously improve the mechanical strength and proton conductivity of the proton exchange membrane.