1308 results about "Ionomer" patented technology

Proton exchange membranes are described. The proton exchange membranes comprise a reinforced membrane, a continuous nonporous hydrogen recombination catalyst coating layer comprising a mixture of hydrogen recombination catalyst and a proton conducting ionomer, and a continuous nonporous cross-linked polyelectrolyte multilayer coating comprising alternating layers of a polycation polymer and a polyanion polymer. Catalyst coated membranes incorporating the proton exchange membranes and methods of making the proton exchange membranes are also described.

The invention belongs to the technical field of engineering plastics, and particularly relates to a high-flame-retardant composite material and a preparation method thereof. The composite material comprises the following components: long-carbon-chain semi-aromatic nylon, a fiber reinforced filler, a flexibilizer, alkyl aluminum phosphinate, nano montmorillonite, a zinc ion ionomer, a coupling agent, a lubricant and an antioxidant. Alkyl aluminum phosphinate is used as a main flame retardant, and nano-montmorillonite and a zinc ion ionomer are used as auxiliary flame retardants. The nano-scale montmorillonite has certain adsorption performance, and can prevent the alkyl aluminum phosphinate flame retardant from being separated out in the processing process. The zinc ion ionomer is easier to disperse in a long-carbon-chain semi-aromatic nylon resin matrix relative to alkyl aluminum phosphinate and nano-montmorillonite, and ion groups contained in the zinc ion ionomer can generate an ionic crosslinking effect with ions in alkyl aluminum phosphinate and nano-montmorillonite, so that the mechanical property and the thermal stability of the composite material are improved; and moreover, the melt viscosity is improved, and the molten drop phenomenon during combustion is prevented.

A advanced fuel cell (AFC) assembly comprises a variety of features improving its performance, reliability, durability, and manufacturability include an ion exchange membrane such as a proton exchange membrane comprising polymers of perfluorinated sulfonic acid or hydrocarbon compounds supported by an inert endoskeletal structure of greater mechanical strength preventing deformation damage from handling, temperature cycling, and ionomer swelling and contraction from humidity cycling. The endoskeleton may be attached to wider exoskeletal pillars used for singulating one membrane from another after fabrication and to a thicker handle used to transport the membrane during processing prior to separation. Other AFC features include a asymmetric catalyst coated membrane inhibiting fuel cross over, oxygen back streaming, and CO atmospheric poisoning; a graded heterogenous gas diffusion layer for enhanced charge and gas transport; and a self-aligned gasket-less assembly with integrated sealant preventing gas leakage.

The invention discloses a membrane electrode heat treatment method for changing catalyst layer ionomer clusters. The membrane electrode heat treatment method comprises the following steps: 1) coating the surface of a proton exchange membrane with a catalyst; (2) carrying out heat treatment on the membrane electrode obtained in the step (1); and (3) carrying out acid treatment on the proton exchange membrane subjected to heat treatment. The invention also discloses application of the membrane electrode heat treatment method for changing the catalyst layer ionomer cluster in water electrolysis hydrogen production and fuel cells. According to the membrane electrode heat treatment method provided by the invention, the migration rates of the main chain and the side chain of the ionomer in the catalyst layer are improved to different degrees by carrying out heat treatment on the membrane electrode, so that the cluster structure of the ionomer in the catalyst layer is changed, the ohmic loss is reduced, and the overall electrolysis performance of the membrane electrode is improved; therefore, the running cost of hydrogen production by electrolysis of water and the running process of the fuel cell is reduced.

The present disclosure relates to polymers synthesized from ionomers having an aromatic hydrocarbon-containing backbone and an amine-containing ionic or ionizable moiety with polystyrene. The linkage between the ionomer and the polystyrene is made through covalent bonds or linking moieties. Electrochemical cells having polymer electrolyte membranes composed of the combined polymers are also described.

The invention provides a novel polynorbornene anion exchange ionomer containing a polar functional group as well as a preparation method and application of the novel polynorbornene anion exchange ionomer. The polynorbornene has excellent thermal stability and chemical stability. Meanwhile, the AEI main chain of the polynorbornene has no aryl group, so that the adsorption influence caused by the aryl group is avoided. The synthesized addition polynorbornene AEI in the form of quaternary ammonium salt can be dissolved in a low-boiling-point solvent, and it is ensured that a membrane electrode can be prepared through a solvent casting method. Besides the solubility of the AEI, the addition polynorbornene-based AEI in the form of quaternary ammonium salt is modified by utilizing a thiol-ene click reaction, an anion exchange ionomer containing a polar functional group can be prepared, the interaction between the AEI and an electrolytic catalyst is improved, the reaction is simple and easy to operate, the universality is high, and the method is suitable for industrial production. And the current density in the AEMWE system containing the AEI can be effectively improved.

The invention relates to an anion exchange membrane based on isopropyl piperidone and biphenyl and a preparation method of a membrane electrode, the preparation method comprises the following steps: respectively dissolving an aromatic monomer and IPD in a first solvent, and mixing to obtain a mixed solution, the aromatic monomer being BP or TP; dropwise adding an acidic initiator into the mixed solution for reaction at the reaction temperature of-5 DEG C to 0 DEG C to obtain a nitrogen heterocyclic ring polymer intermediate; adding a quaternization reagent into the nitrogen-containing heterocyclic ring polymer intermediate to realize quaternization modification of nitrogen atoms to obtain a quaternization ionomer; and forming a film to obtain the AEM film. The preparation method of the membrane electrode comprises the following steps: respectively forming a cathode catalyst layer and an anode catalyst layer on two opposite sides of an AEM membrane through ultrasonic spraying to obtain the MEA. The AEM membrane and the MEA obtained according to the invention have the characteristics of excellent stability and high water electrolysis performance, can significantly improve the efficiency and durability of AEMWE, and are suitable for the fields of hydrogen production by water electrolysis and the like.

The invention discloses a catalyst layer for a fuel cell and a preparation method thereof, the catalyst layer comprises an anode catalyst and a cathode catalyst, the anode catalyst layer comprises a Pt-C catalyst, high dielectric micromolecular alcohol, sulfonated lignin doped conductive polymer nanoparticles, a hydrophilic adhesive, an ionomer solution and deionized water; the cathode catalyst layer comprises a catalyst, an ionomer solution, high-dielectric micromolecular alcohol, polytetrafluoroethylene and deionized water; the technical problems that an existing catalyst layer for a fuel cell is poor in water management effect, and an adopted water management material is poor in conductivity can be solved. The preparation method is simple and convenient, and the preparation difficulty and the operation difficulty of operators are greatly reduced.

The invention relates to the technical field of electrochemical carbon dioxide reduction reaction catalysts, and discloses a preparation method and application of a mixed ionomer modified cuprous oxide catalyst, a hydrophobic ionomer and a proton exchange ionomer are used for performing surface modification on cuprous oxide powder, an effective hydrophobic structure is constructed on a Cu2O active site in a physical coating form, and the cuprous oxide modified cuprous oxide catalyst is prepared. A stable and controllable hydrophobic gas-liquid-solid three-phase reaction micro-interface is formed, so that the problems of low C-2 Faraday efficiency, poor selectivity, serious competitive hydrogen evolution reaction, carbonate deposition and the like in the existing process of preparing a C-2 product by electrocatalytic carbon dioxide reduction are solved, and the industrial current density (gt; and the method has the advantages of simple process flow, low price, high product selectivity and the like.

The invention provides a random copolymerization sulfonated phenyl polyphenyl ionomer material and a preparation method thereof, belongs to the technical field of proton exchange membrane materials of fuel cells, and aims to solve the technical problems of low conductivity and poor chemical stability of proton exchange membranes. The ionomer takes monomers I and II as raw materials, the raw materials are dissolved in a reaction medium of a polar solvent, a catalyst is added into a reaction system at the temperature of 70-100 DEG C, and the reaction continues for 3-6 h under the condition; pouring a reaction solution into a concentrated hydrochloric acid aqueous solution after the reaction is finished, separating out a precipitate, and filtering; and washing with concentrated hydrochloric acid and deionized water, and finally drying to obtain the target ionomer. The preparation method has the characteristics that the synthesis is simple, the cost is low, the molecular weight of the obtained polymer is high, the proton exchange membrane is good in conductivity, high in water absorption and the like, and the prepared proton exchange membrane has a wide application prospect when being used as a proton exchange membrane of a hydrogen fuel cell.

The invention provides a membrane electrode, a preparation method thereof and a monocell, the membrane electrode comprises a double-cathode catalyst layer, a proton exchange membrane and a gas diffusion layer, the double-cathode catalyst layer comprises a first catalyst layer and a second catalyst layer; the first catalyst layer is connected with the proton exchange membrane, and the second catalyst layer is connected with the gas diffusion layer; the raw materials of the double-cathode catalyst layer comprise a platinum-containing catalyst and an ionomer; the particle size D50 of platinum in the first catalyst layer is smaller than the particle size D50 of platinum in the second catalyst layer. The double-cathode catalyst layer is arranged, and the particle size D50 of platinum in the first catalyst layer is smaller than the particle size D50 of platinum in the second catalyst layer, so that the utilization rate of the material is improved to the maximum extent, the cost is reduced, the performance and the overall durability of the membrane electrode are improved, and the membrane electrode has good development potential.

The invention discloses a preparation method of a self-humidifying membrane electrode of a proton exchange membrane fuel cell, relates to a preparation method of a membrane electrode, and aims to solve the technical problem of poor performance of the conventional self-humidifying membrane electrode. The method comprises the following steps: 1, synthesizing a COFs material by using 2, 4, 6-triformyl phloroglucinol and 2, 5-diaminobenzene sulfonic acid through a two-phase method; 2, preparing slurry a by using a Pt / C catalyst and a perfluorosulfonic acid ionomer solution; preparing self-humidifying catalyst layer slurry b from a COFs material, a Pt / C catalyst and a perfluorosulfonic acid ionomer solution; and 3, coating the slurry a on the anode surface of the proton exchange membrane, and coating the slurry b on the cathode surface to obtain the self-humidifying membrane electrode. According to the electrode, H2 / O2 is used as fuel, and the power density is 756.3 mW / cm < 2 > under the relative humidity of 20%; h2 / air is used as fuel, the power density is 437.8-879.7 mW / cm < 2 > under the relative humidity of 50%, and the material can be applied to the field of fuel cells.

The present invention provides a catalyst-layer-equipped electrolyte membrane and an application of the same, said catalyst-layer-equipped electrolyte membrane comprising: an anode catalyst layer containing an ionomer and an anode catalyst component that is composed of iridium-containing manganese dioxide, the molar ratio of iridium to manganese in the anode catalyst component being 0.011-0.182, and the logarithm log(amount of ionomer / amount of anode catalyst component) of the ratio of the amount of the ionomer to the amount of the anode catalyst component being −1.40 to −0.46; a proton exchange membrane; and a cathode catalyst layer.

The invention relates to a membrane electrode with high oxygen permeability and a preparation method thereof, the membrane electrode comprises a proton exchange membrane, an anode catalyst layer and a cathode catalyst layer, the anode catalyst layer and the cathode catalyst layer are arranged on two sides of the proton exchange membrane, and anode catalyst slurry comprises an anode catalyst, an ionomer and a dispersing solvent in a mass ratio of 1: (1-10): (10-1000); the cathode catalyst slurry comprises a cathode catalyst, an ionomer, an ionic liquid and a dispersing solvent in a mass ratio of 1: (1-10): (1-10): (10-1000). Compared with the prior art, in order to solve the problem that oxygen mass transfer of a porous carbon carrier in a fuel cell catalyst layer is difficult, the method that ionic liquid and ionomer are mixed in advance, then slurry is prepared, and the slurry is sprayed to prepare the membrane electrode is adopted, so that a compact structure formed by an ionomer membrane on the surface of a catalyst is weakened, and the distribution uniformity of the ionomer membrane is improved; the local oxygen mass transfer resistance is obviously reduced, and the performance of the fuel cell under high current density is improved.

The invention discloses a method and a system for generating a two-dimensional aggregate structure model of a catalyst layer. The method comprises the following steps: acquiring target quantities corresponding to carriers, catalyst particles and ionomers respectively; generating a carrier in the catalyst layer grid, and marking a grid region where the carrier is located by adopting a first mark value; available blank adjacent points of the catalyst layer grid areas marked by adopting the first mark values are obtained, catalyst particles are generated at the available blank adjacent points, and the grid areas where the catalyst particles are located are marked by adopting second mark values; obtaining placement points in the remaining area of the catalyst layer grid to generate an ionomer, and marking the grid area where the ionomer is located by adopting a third mark value; and filling gaps of the generated ionomer, and marking an ionomer connected component meeting an area threshold condition by adopting a third mark value to obtain a catalyst layer two-dimensional aggregate structure model. By utilizing the scheme of the invention, the real distribution state and dependency relationship of each phase in the catalyst layer can be accurately reflected.

The invention discloses a method for evaluating the ink performance of a proton exchange membrane fuel cell, and relates to the technical field of proton exchange membrane fuel cell detection. The method mainly adopts an electrochemical workstation to perform performance test on the dispersed slurry, simulates stress conditions under specific working conditions, effectively distinguishes electrochemical active area attenuation caused by ionomer agglomeration and platinum particle separation in the slurry in combination with electrochemical response differences, and is relatively high in test result precision, short in period and high in accuracy. And the slurry development marginal cost can be obviously reduced.

The present invention belongs to the field of electrochemistry, and specifically relates to an anion membrane electrode and a preparation method thereof, and a device for preparing synthesis gas by gas-phase electrolysis of carbon dioxide. The preparation method is as follows: a porous membrane protective layer is covered on the surface of a vacuum heating plate, and then an anion membrane is covered; then an anion exchange ionomer solution and a cathode catalyst anion exchange ionomer solution are sprayed on the surface in sequence. The present invention can reduce the structural damage to the anion membrane caused by the temperature fluctuation of the metal plate surface during the heating process of the vacuum heating plate by introducing a porous membrane protective layer between the anion membrane and the vacuum heating plate; the anion exchange ionomer layer is introduced between the catalyst layer and the anion membrane to increase the bonding strength between the catalyst layer and the anion membrane and increase the stability of the membrane electrode; during the volatilization process of the heating solvent, the solvent can be promoted to volatilize at low temperature by blowing dry, thereby accelerating the membrane electrode preparation process and improving the stability of the membrane electrode, thereby extending the service life of the device.

The invention discloses a copper-based current collector modified by a self-repairing artificial interface layer, a preparation method of the copper-based current collector and application of the copper-based current collector in a negative-electrode-free lithium battery. According to the self-repairing artificial interface layer, an ionomer with a self-repairing function is prepared from a nitrogen-containing water-soluble comonomer, a quaternary ammonium salt monomer, double-bond-terminated polyoxyethylene and a dopamine self-repairing monomer in a solution polymerization mode, and the ionomer with the self-repairing function is prepared into a solution to serve as an electrophoresis solution; and depositing the ionomer on the exposed copper-based current collector by adopting an electrophoretic deposition method. The artificial interface layer obtained by the method is compact and uniform, the thickness is adjustable, and the effects of accelerating lithium ion transmission, homogenizing lithium deposition, self-repairing and the like can be achieved. When the copper-based current collector modified by the self-repairing artificial interface layer is used for the negative-electrode-free lithium battery, the cycle life of the copper-based current collector is obviously prolonged, and a new solution is provided for developing the high-performance negative-electrode-free lithium battery.

The invention relates to the technical field of membrane electrodes, in particular to a membrane electrode catalyst layer with a gradient aperture structure and a manufacturing method thereof.The catalyst layer is attached to the side face of a proton exchange membrane through hot pressing, and the catalyst layer at least comprises three catalyst sub-layers; the catalytic sublayer comprises ultrapure water, an organic solvent, a catalyst, a foaming agent and an ionomer; in the direction far away from the proton exchange membrane, the mass ratio of the catalyst to the foaming agent in different catalytic sub-layers is gradually reduced, and the pore diameter and the porosity in the catalytic layers are gradually increased. The membrane electrode catalyst layer provided by the embodiment of the invention can reduce the probability of'flooding 'of the gas diffusion layer (GDL) and improve the transmission performance of battery gas and reactants.

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 present invention relates to a poly (arylpiperidinium) copolymer ionomer which does not have an aryl ester bond in a polymer backbone and has a branched piperidinium group introduced into a repeating unit, thereby having excellent chemical stability, excellent mechanical properties, and excellent mechanical properties. And meanwhile, the polymer has the advantages of high molecular weight, low swelling ratio, high dimensional stability, high ionic conductivity and limited phenyl adsorption effect. Furthermore, the anion exchange membrane prepared from the branched poly (arylpiperidinium) copolymer ionomer can be operated under low humidity conditions and is excellent in water management, and thus can be applied to membranes and binders for alkaline fuel cells, water electrolysis devices, carbon dioxide reduction, vanadium redox flow batteries, or metal-air batteries.

The present invention relates to water-insoluble polymer membranes (AEM) on the basis of new side-chain functionalized copolymers and their use as alkaline anion exchange membrane materials, for example in alkaline water electrolyzers, fuel cells or flow batteries.

The invention discloses an anode composite catalyst layer and slurry thereof, a preparation method and a membrane electrode, the anode composite catalyst layer is located between a proton exchange membrane and a gas diffusion layer of the membrane electrode, the anode composite catalyst layer comprises an iridium catalyst layer, the iridium catalyst layer has a first surface and a second surface which are opposite, the first surface faces the proton exchange membrane, and the second surface faces the gas diffusion layer. The second surface faces the gas diffusion layer, and the iridium catalyst layer comprises a first ionomer and an iridium catalyst dispersed in the first ionomer; the platinum conducting layer is provided with a third surface and a fourth surface which are opposite to each other, the third surface is in contact with the second surface of the iridium catalyst layer, the fourth surface faces the gas diffusion layer, and the platinum conducting layer comprises a second ionomer and platinum nano-particles which are dispersed in the second ionomer and have the particle size ranging from 10 nm to 500 nm. According to the anode composite catalyst layer, the membrane electrode has relatively low contact resistance and excellent stability.

The preparation method comprises the following steps: mixing a catalyst, a pore forming agent, an ionomer and a solvent, carrying out ultrasonic treatment in an ice-water bath until the mixture is uniformly dispersed, then coating a polytetrafluoroethylene membrane with the mixture to obtain a catalytic layer, and then carrying out hot pressing and transferring the catalytic layer to two sides of a proton exchange membrane to obtain the membrane electrode. The catalyst layer of the prepared membrane electrode has a cross-linked porous network structure formed in situ when the pore forming agent is pyrolyzed and separated in the hot-pressing transfer printing process, so that the specific surface area of a three-phase interface and the utilization rate of a noble metal catalyst are increased, the gas and liquid mass transfer resistance of the membrane electrode is reduced, and the material transmission capability is improved; the performance of the membrane electrode is improved, and the membrane electrode has more excellent stability.

The invention discloses a multi-component atomic level oxide solid solution integrated electrode for electrolyzed water and a preparation method thereof, and belongs to the field of metal material surface plating. The electrode is composed of a gas diffusion layer, a nano array substrate and an atomic level oxide solid solution catalyst layer. The preparation method comprises the following steps: constructing a nano array microreactor on the surface of the gas diffusion layer; the method comprises the following steps: driving an atomic hierarchy solid solution to reconstruct by utilizing an array confinement effect through combination of precursor directional spraying and a heat treatment-rapid quenching process, and constructing a three-dimensional conformal ionomer network on the surface of the atomic hierarchy solid solution; and performing gold plating treatment on the back side of the electrode. Through the synergistic effect of spatial constraint and thermodynamic regulation of the nano microreactor, the traditional electrode interface mismatch bottleneck is broken through, and while precise construction of atomic-scale active sites is realized, the mechanical stability and oxygen evolution reaction kinetics of the electrode are improved. The preparation process has the advantages of controllable flow, strong large-scale expansibility and good industrial preparation prospect.

The invention provides organic phosphonic acid betaine and a preparation method thereof, and particularly relates to glycidyl-containing ammonium-phosphine type betaine, the organic phosphonic acid betaine can be used as a functional monomer for surface free radical grafting modification of high polymer materials such as polyolefin, or can be used as a functional monomer for copolymerization of acrylic ester, acrylonitrile or other olefin monomers, or can be used as a functional monomer for surface free radical grafting modification of high polymer materials such as polyolefin, or can be used as a functional monomer for surface free radical grafting modification of high polymer materials such as polyolefin. The amphiprotic ionomer can also be used for ring-opening grafting modification of starch, cellulose, polyurethane, polyamide and other high polymer materials containing amino or hydroxyl in the structure, and meanwhile, the obtained high polymer materials are endowed with the functional effects of amphiprotic ionization, hydrophilicity, antibacterial property, antifouling property and the like of phosphonic acid betaine. And the chemical stability in an acid-base water environment is high.

To provide a hydrogen ion conductive multi-layer composite membrane having excellent durability, ion conductivity, and hydrogen permeation reduction effect.SOLUTION: The present invention provides a hydrogen ion conductive multilayer composite membrane comprising: inner reinforced membranes comprising a porous PTFE layer impregnated with an ionomer composition and outer reinforced membranes positioned on both sides of the inner reinforced membrane, wherein the outer reinforced membranes comprise a porous PTFE layer impregnated with an ionomer composition.SELECTED DRAWING: Figure 1

The present invention provides an organic phosphonic acid betaine and a preparation method thereof, specifically an ammonium phosphonic acid betaine containing a glycidyl group. The organic phosphonic acid betaine can be used as a functional monomer for free radical grafting modification of the surface of a polymer material such as polyolefin, or can be mixed with acrylate, acrylonitrile or other olefin monomers for copolymerization to prepare an amphoteric ionomer. The organic phosphonic acid betaine can also be used for ring-opening grafting modification of polymer materials such as starch, cellulose, polyurethane, and polyamide containing amino or hydroxyl groups in their structures. At the same time, the phosphonic acid betaine imparts functional effects such as zwitterionization, hydrophilicity, antibacterial properties, and antifouling properties to the obtained polymer material. The organic phosphonic acid betaine also has high chemical stability in acidic and alkaline water environments.

A multilayer film having a first surface layer of a polyethylene or polypropylene polymer; a tear layer comprising from 70% to 95% by weight of a continuous phase polyethylene polymer and from 5% to 30% by weight of one or more dispersed phase olefin polymers selected from the group consisting of polybutylene, polypropylene, cycloolefin copolymers, EVOH and ionomers; and optionally a second surface layer of a polyethylene or polypropylene polymer. The multilayer film is oriented in the machine direction and is characterized by a ratio of transverse Elmandoff tear strength to longitudinal Elmandoff tear strength of greater than 10. A multilayer film may have a sealing layer added to form a laminate, and the laminate may be used to form a packaging product.

The invention belongs to the technical field of hydrogen fuel cells, and particularly relates to high-stability fuel cell catalyst slurry as well as a preparation method and application thereof, and the catalyst slurry comprises nonionic polyacrylamide, a catalyst, an ionomer solution and a water-alcohol mixed solution. The stability of the JM4000 hydrogen fuel cell catalyst slurry is improved by adding polyacrylamide (PAM) as a nonionic additive, and the dispersity, the stability and the electrochemical performance of the slurry are successfully improved.