1754results about "Organic diaphragms" patented technology

The invention belongs to the technical field of anion exchange membranes, and relates to a cross-linked polyaromatic piperidine anion exchange membrane and a preparation method thereof. The exchange membrane structure comprises a copolymer structure of the following repetitive structural units, the selected rigid main chain polyaromatic hydrocarbon can ensure the mechanical strength of the anion exchange membrane, meanwhile, the toughness of the anion exchange membrane is further enhanced by adopting a cross-linked structure, and a formed cross-linked network can reduce swelling of the anion exchange membrane, so that the anion exchange membrane is more stable in performance. The mechanical performance is improved; according to the invention, ether-free skeleton polyaromatic hydrocarbon is selected as a main chain and has the characteristic of strong alkali-resistant stability, six-membered nitrogen heterocyclic ions are adopted as functional groups, and a large steric hindrance structure can hinder nucleophilic substitution and elimination reaction, so that the alkali-resistant stability of the anion exchange membrane is improved, and the service life of the anion exchange membrane is prolonged. And in the # imgabs0 #, X is equal to 0.05 to 0.15.

The invention provides an alkaline electrolytic water hydrogen production diaphragm based on zirconium oxide modification, the alkaline electrolytic water hydrogen production diaphragm comprises a support layer and a hydrophilic modified coating on the support layer, the hydrophilic modified coating is obtained by coating the support layer with a casting liquid prepared from modified zirconium oxide particles, a film-forming polymer and an organic solvent and then carrying out non-solvent induced phase inversion, the modified zirconium oxide particles are prepared by adding micron-sized zirconium oxide and alkali liquor into a ball mill for ball milling, and the particle size of the zirconium oxide subjected to ball milling treatment is 20-100nm. According to the method, the structure of the micron-sized zirconium oxide particles is regulated and controlled by combining a ball milling-alkali etching synchronous process. Through combination of ball milling treatment and alkali etching treatment, the dispersion degree and the reaction opportunity of the zirconium oxide powder can be effectively improved, and the efficiency of the etching process is remarkably improved. The obtained modified zirconium oxide particles endow the diaphragm with excellent hydrophilicity, alkali resistance and OH <-> ion conduction performance, and the diaphragm has excellent performance when being used as an alkaline electrolytic water hydrogen production diaphragm.

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.

To provide: a solid polymer electrolyte membrane for alkaline water electrolysis excellent in omnidirectional large pressure resistance generated on a diaphragm partitioning an anode chamber and a cathode chamber of a water electrolysis apparatus and having a gas blocking property stably suppressing mixing of an oxygen gas and a hydrogen gas; and an alkaline water electrolysis apparatus.SOLUTION: There is provided a solid polymer electrolyte membrane which contains a nonwoven fabric comprising a fluorine-containing polymer having an ion exchange group and a polymer having a hydrogen permeability coefficient within a predetermined range, in which the weight of the fluorine-containing polymer per unit area of the solid polymer electrolyte membrane is within a predetermined range.SELECTED DRAWING: Figure 1

The present invention provides a method for manufacturing a dried ion exchange membrane that can manufacture a water electrolysis device having suppressed liquid leakage.　The method for producing a dried ion exchange membrane according to the present invention is a method in which a wet ion exchange membrane, which was obtained as a result of an ion exchange membrane that includes a fluoropolymer having ion exchange groups being wetted using a liquid medium, is dried to remove the liquid medium, thereby obtaining a dried ion exchange membrane, wherein the wet ion exchange membrane is dried from a state where the amount of the liquid medium adhering to the surface of the wet ion exchange membrane is 40 g / m2 to 600 g / m2.

The invention provides a modified alkaline electrolytic water hydrogen production diaphragm and a preparation method thereof. The modified diaphragm comprises a base membrane loaded with a Cu < 2 + > complexed chitosan alkali-resistant ion conduction unit, and the Cu < 2 + > complexed chitosan alkali-resistant ion conduction unit is obtained by loading chitosan through the base membrane and soaking in a Cu < 2 + > complexed solution for complexing. By introducing a copper-chitosan complex structure, a stable ionic conduction channel is constructed in an alkaline environment, and the alkali resistance and ionic conductivity of the membrane are effectively improved. According to the modified alkaline diaphragm for hydrogen production by electrolysis of water, the problems of insufficient alkali resistance, limited ion transmission capability and the like of a diaphragm material in the prior art are solved, and a new solution is provided for preparing the diaphragm for hydrogen production by electrolysis of alkaline water with long service life, high efficiency and low cost.

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 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.

Provided is a porous separator selected from (a) to (c). (a) Porous membranes containing hydrophilic inorganic particles, an aromatic porous support, and an organic polymer including a hydrophilic organic polymer that has a sulfo group and / or a carboxy group and has an acid value of 0.3 mmol / g or higher; (b) porous membranes containing no porous support and containing hydrophilic inorganic particles and an organic polymer including a hydrophilic organic polymer that has a sulfo group and / or a carboxy group and has an acid value of 0.3 mmol / g or higher, the hydrophilic inorganic particle content of said porous membranes being 10 mass% or greater; (c) porous membranes containing no hydrophilic inorganic particles and containing an aromatic porous support and an organic polymer including a hydrophilic organic polymer that has a sulfo group and / or a carboxy group and has an acid value of 0.3 mmol / g or higher.

The invention discloses an alkaline electrolyzed water diaphragm based on nickel oxyhydroxide and a preparation method and application of the alkaline electrolyzed water diaphragm, and relates to the technical field of composite diaphragms.The alkaline electrolyzed water diaphragm is prepared through a phase inversion method, and nanometer nickel oxyhydroxide NiOOH particles are selected as inorganic nanometer filler; the mass percent of the nickel oxyhydroxide in the membrane casting solution is 15-30%. A strong chemical bond formed by nickel ions and hydroxyl in the hydroxyl nickel oxide crystal endows the material with excellent structural stability, and the material shows excellent solubility resistance, hydrolysis resistance and structural collapse resistance in a strong alkaline electrolysis environment and can tolerate high-concentration OH <-> erosion for a long time; meanwhile, the intrinsic high-oxidation-resistance characteristic is achieved.

A new polyelectrolyte multilayer coated proton-exchange membrane for electrolysis and fuel cell applications has been developed for electrolysis and fuel cell applications. The polyelectrolyte multilayer coated proton-exchange membrane comprises: a cation exchange membrane, and a polyelectrolyte multilayer coating on one or both surfaces of the cation exchange membrane. The polyelectrolyte multilayer coating comprises alternating layers of a polycation polymer and a polyanion polymer. The polycation polymer layer is deposited on and is in contact with the cation exchange membrane. The top layer of the polyelectrolyte multilayer coating can be either a polycation polymer layer or a polyanion polymer layer.

The invention relates to a sodium carboxymethyl cellulose modified ultrathin alkaline water electrolysis composite diaphragm as well as a preparation method and application thereof. The alkaline electrolytic water diaphragm provided by the invention not only has excellent hydrophilicity and low surface resistance, but also has high gas barrier property and excellent mechanical property. In addition, the diaphragm is simple in preparation process and low in cost, and has industrial application potential.

The present techniques relate to a microchanneled solid electrolyte (MSE), an electrolyzer and a method including or using the MSE for in-situ regeneration and collection of CO2 during a CO2 electroreduction operation. The MSE includes an anion conducting layer configured to conduct (bi) carbonate anions from a surface of an adjacent cathode; a cation conducting layer configured to conduct protons from a surface of an adjacent anode; and an integrated channel layer comprising multiple microchannels formed between the anion conducting layer and the cation conducting layer. The microchannels define a hollow path extending across the integrated channel layer for receiving the (bi) carbonate anions from the anion conducting layer and the protons from the cation conducting layer, thereby locally regenerating and collecting CO2 along and within the microchannels.

The invention belongs to the field of proton exchange membrane water electrolysis hydrogen production, and particularly relates to a functionalized ionic liquid modified PVDF / Nafion composite proton exchange membrane as well as a preparation method and application thereof, which are used for solving the technical problems of high cost, low mechanical strength, swelling at high temperature and low conductivity of a Nafion composite membrane. A PVDF / Nafion solution is subjected to functionalized ionic liquid modification to obtain a membrane casting solution, and then the membrane casting solution is coated and dried to obtain the functionalized ionic liquid modified PVDF / Nafion composite proton exchange membrane. According to the ionic liquid modified PVDF / Nafion composite proton exchange membrane disclosed by the invention, the usage amount of Nafion resin is reduced, the cost is reduced, and meanwhile, the proton conductivity is improved by adding the ionic liquid; the ionic liquid functionalized by different cations can form a hydrogen bond network with sulfonic acid groups of Nafion and fluorine atoms of PVDF, so that the mechanical property and the thermal stability of the proton exchange membrane are improved, and the proton exchange membrane has a good application prospect.

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 invention relates to a catalyst ink, a process for coating substrates with this ink, the coated substrates obtained by the process, and their use. The objective was to provide a catalyst ink that has a high solids content and, at the same time, is easy to doctor. The catalyst ink should, if possible, contain no solvents known to be carcinogenic, mutagenic, or toxic to reproduction. The coated substrates produced with the catalyst ink should be usable, in particular, in alkaline membrane water electrolysis as catalytically active or activatable anion exchange membranes. This objective was achieved by a solvent mixture containing alkanol and acetonitrile. The improvement lies in the fact that both the weight fraction of acetonitrile and the weight fraction of alkanol are greater than the weight fraction of the binder contained in the catalyst ink.

To provide an electrolyte membrane having excellent solubility, that is, good film-forming properties and excellent alkali durability and the electrolyte membrane is particularly suitable for anion exchange-membrane water electrolysis and can generate hydrogen efficiently.SOLUTION: There is provided an electrolyte membrane using a polymer whose molecular weight distribution index (Mw / Mn) satisfies the following expression (equation 1).SELECTED DRAWING: None

A bipolar membrane in which a cation-exchange membrane and an anion-exchange membrane are joined to each other, wherein a leakage ratio of gluconic acid at 60° C. is not more than 1.0%, and the cation-exchange membrane is supported by a polyolefin reinforcing member and, further, contains a polyvinyl chloride.

The present disclosure provides a dispersion-cast ion-conducting membrane for a proton exchange membrane water electrolyser, the membrane comprising a dispersion cast ion- conducting polymer layer which layer comprises an ion-conducting polymer, the ion- conducting polymer layer having a maximum burst strength of greater than or equal to 10.5 MPa.

Hybrid electrocatalyst layers for use in an electrochemical cell and processes for making the same are described. The hybrid electrocatalyst layers include at least one ion-conducting layer and at least one nonionic conductive catalyst layer. The processes for making the hybrid electrocatalyst layers include a sintering step, which provides greater durability of the hybrid electrocatalyst layers.

The invention relates to the technical field of diaphragms, in particular to an alkaline electrolyzed water porous diaphragm and a preparation method and application thereof.The preparation method comprises the following steps that engineering thermoplastic resin and a diluent are mixed in a nitrogen atmosphere in a sealed mode to obtain a mixed solution, and then the mixed solution is heated to obtain a membrane casting solution; the membrane casting solution is cast on a glass plate at the temperature of 200-350 DEG C, the casting thickness of the membrane casting solution on the glass plate is controlled to be 100-500 microns, then the glass plate where the membrane casting solution is cast is placed at the room temperature to be cooled and then placed in cooling water to be cooled again, so that the membrane casting solution is solidified on the glass plate to form a membrane, and the glass plate and the membrane are separated to obtain an alkaline electrolytic water liquid membrane; and immersing the alkaline electrolyzed water liquid membrane into heated acetone to extract the diluent, thereby obtaining the alkaline electrolyzed water porous diaphragm. The diaphragm prepared by the preparation method of the alkaline electrolyzed water porous diaphragm has relatively low ion impedance and relatively high mechanical strength and alkali resistance.

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 relates to a high-entropy perovskite material and a preparation method and application thereof, the chemical formula of the high-entropy perovskite material is ABO3, the A-site element is La element, and the B-site element is selected from 5-10 transition metal elements; the high-entropy perovskite material has a two-dimensional Tailing structure, nano-particles are arranged in a cross-linking manner, and gaps are formed among the particles. Compared with the prior art, the two-dimensional Turing structure high-entropy perovskite material is endowed with excellent electro-catalytic water decomposition hydrogen production performance due to unique morphology and components, is adaptive to fluctuation power of clean energy such as wind energy and solar energy, and has a wide industrial application prospect.

To provide an ion conductive polymer having improved ion conductivity, and a separation membrane containing the same.SOLUTION: The present disclosure relates to an ion-conducting polymer having a repeat unit comprising a quaternary ammonium and at least one ether group.SELECTED DRAWING: None

Proton exchange membranes are described. The proton exchange membrane includes: a reinforcing membrane; a continuous non-porous hydrogen recombination catalyst coating, the continuous non-porous hydrogen recombination catalyst coating comprising a mixture of a hydrogen recombination catalyst and a proton conducting ionomer; and a continuous non-porous cross-linked polyelectrolyte multilayer coating, the continuous non-porous cross-linked polyelectrolyte multilayer coating comprising alternating layers of a polycationic polymer and a polyanionic polymer. Catalyst coated membranes incorporating proton exchange membranes and methods of making proton exchange membranes are also described.

A separator for alkaline water electrolysis comprising: - a porous support (100) and on at least one side of the support, in order: - an optional porous layer including a Polymer A (200), and - a non-porous layer including a Polymer B (300), characterized in that the separator is obtainable by coating on the porous support (100) or the optional porous layer (200) a Polymer B solution having a viscosity of at least 400 mPa.s, measured at 20°C and a shear rate of 100 s-1, and wherein the separator has a Bubble Point, measured according to ASTM F316, of at least 5 bar.

The present invention relates to separation membrane material, a method for producing same, and a separation membrane and a water electrolysis apparatus comprising same. More specifically, the separation membrane material has excellent electrochemical properties such as ionic conductivity, mechanical properties, and chemical durability, and the membrane that is produced is superbly uniform.

Systems and methods for a catalyzed asymmetric bipolar membrane are described. The catalyzed asymmetric bipolar membrane can maintain a desired current density over a long period of time at a low operating voltage. The catalyzed asymmetric bipolar membrane can be implemented in an electrodialysis cell for various applications such as carbon capture.

Provided is a versatile nonwoven fabric having excellent heat resistance and mechanical strength and applicable to applications requiring heat resistance; or a nonwoven fabric having excellent heat resistance, mechanical strength, and permeability. Moreover, provided is a separator for electrochemical elements having excellent heat resistance and mechanical strength. Furthermore, provided is a membrane support having excellent heat resistance, mechanical strength, and ion permeability.The nonwoven fabric of the present invention comprises a polymethylpentene component and a polyethylene component, wherein the polyethylene component is fused, and wherein the polymethylpentene component accounts for 30% by volume or more of the total fibers constituting the nonwoven fabric, and the polyethylene component accounts for 30% by volume or more of the total fibers constituting the nonwoven fabric. The separator for electrochemical elements of the present invention comprises the nonwoven fabric. Another nonwoven fabric of the present invention comprises core-sheath composite fibers having a polyethylene component as a sheath component and a polymethylpentene component as a core component, wherein the polyethylene component as the sheath component of the core-sheath composite fiber is fused, wherein the polymethylpentene component accounts for 30% by volume or more of the total fibers constituting the nonwoven fabric, and the polyethylene component accounts for 30% by volume or more of the total fibers constituting the nonwoven fabric, wherein a thickness of the nonwoven fabric is 100 μm or less, and the nonwoven fabric has a direction with a tensile strength per mass per unit area of 2.0 N / 5 cm-width or more, or wherein a ratio (L / D) of a fiber diameter (D, unit: μm) to a length (L, unit: μm) of the core-sheath composite fiber is 350 or more. The membrane support of the present invention comprises the other nonwoven fabric.

The present invention relates to an ion exchange membrane containing asymmetric ion channel units, and the ion exchange membrane is based on covalent organic frameworks (COFs) and contains ion channel units having different diameters, degrees of hydrophilicity, and charge characteristics, such that an ion exchange membrane having both excellent ion conductivity and ion selectivity may be produced.