10 results about "Nafion membrane" patented technology

The application discloses an integrated system and method for online observation of stable isotopes of multiple methane emission pathways in rice fields, collects methane gas emitted by plants and non-plant mediation respectively, pre-processes the gas by using a Nafion membrane drying tube and a correction algorithm, realizes continuous measurement of data by using a cavity ring-down spectrum-based analyzer, controls semi-automatic or full-automatic switching of different cavities by using a multi-channel switching and control module, and finally analyzes stable isotope characteristics of plant-mediated and non-plant-mediated emission by using a data processing module combined with a Keeling plot method, so that integrated, continuous and online observation of methane emission pathways in rice fields is realized, and real-time performance, comparability and model verification capability of data are significantly improved.

The invention relates to the technical field of proton exchange membrane materials and preparation, and particularly discloses an enhanced ether-free skeleton hydrocarbon proton exchange membrane as well as a preparation method and application thereof. The proton exchange membrane comprises an ether-free skeleton polyphenyl high polymer matrix, a sulfonate group grafted to a side chain of the matrix, and a polyether-ether-ketone woven mesh reinforcement layer compounded in the matrix, the ether-free skeleton polyphenyl high polymer is prepared through super acid catalysis one-step polymerization, the sulfonate group is introduced through chemical modification to endow proton conduction capacity, and the polyether-ether-ketone woven mesh cloth is combined with a high polymer matrix through a pouring composite process to improve mechanical performance and stability. According to the invention, the problems of environmental harm, supply chain limitation and high cost of the existing perfluorosulfonic acid membrane are solved, the chemical stability is obviously improved compared with that of the traditional sulfonated polyether ether ketone membrane, and the membrane has more advantages in the aspects of dimensional stability, ion selectivity, vanadium ion permeability and comprehensive electrical property of the all-vanadium redox flow battery compared with a commercial Nafion membrane; and the method has extremely high commercial application value.

The invention discloses a method for preparing a high-quality two-dimensional conjugated metal organic framework (2D c-MOFs). At present, 2D c-MOFs synthesized by using a conventional solvothermal method are generally of a polycrystalline structure, the grain size is small, and research on intrinsic properties of the 2D c-MOFs is hindered. An H-shaped pool is used as a reaction container, an organic ligand and a transition metal salt solution are arranged on the two sides of the H-shaped pool respectively, and a Nafion membrane (cation exchange membrane) is arranged between the H-shaped pool and the transition metal salt solution. By utilizing the selective permeability of the membrane to metal cations, the membrane is diffused to a ligand side and is subjected to coordination reaction, so that nucleation and growth kinetics are accurately adjusted, and high-quality 2D c-MOFs are obtained. The preparation method is simple, convenient to operate, high in universality and suitable for growth of various 2D c-MOFs, the obtained material has high crystallinity and large grain size, and a foundation is laid for revealing an intrinsic structure and expanding application of the material.

The invention discloses a flow battery composite diaphragm and a preparation method thereof, and belongs to the technical field of flow battery manufacturing. According to the preparation method of the flow battery composite diaphragm provided by the invention, the front and back surfaces of a Nafion membrane are subjected to solvent spraying activation to swell the Nafion membrane, then the swelled surface is coated with a Nafion solution containing a nano material through electrostatic spraying and pre-dried, and an ultrathin blended layer is formed; and then carrying out heat treatment on the composite membrane to obtain the composite diaphragm with a sandwich structure. According to the method, the surface swelling treatment and the electrostatic spraying technology are combined, so that fusion of the coating and the base film is promoted, and layering and nanoparticle agglomeration are prevented; the ultra-thin blending coating with high nano filler content is constructed on the two sides of the Nafion film through electrostatic spraying, the permeability of vanadium ions is reduced, and meanwhile the original conductivity and mechanical performance of a base body are kept.

An amide-containing aromatic diamine has the following structural formula: where Ar is a group with an aromatic ring structure. The preparation method includes the following steps: (1) mixing and reacting components including aromatic diamine, p-nitrobenzoic acid, alkyl phosphoric anhydride and polar aprotic organic solvent; (2) adding carboxylic acid and halogen-free quaternary ammonium salt to the product obtained in step (1) to obtain a mixed solution, which is placed in the cathode cell of an H-type electrolytic cell; the anode cell and the cathode cell are separated by a Nafion membrane; adding the same polar aprotic organic solvent and halogen-free organic electrolyte as the cathode cell to the anode cell of the H-type electrolytic cell, and adding a metal ion-free reducing agent; and conducting the reaction by electrolysis; (3) purifying the cathode reaction solution obtained in step (2) by post-treatment to obtain the amide-containing aromatic diamine. The yield, purity and whiteness of the amide-containing aromatic diamine are higher.

The application discloses a method for preparing Nafion-Li or Nafion membrane by array capillary and application thereof in batteries. The research result shows that the array capillary can precisely control the transfer of polymer solution to form a uniform ultrathin liquid film, and on this basis, the dynamic viscosity of the liquid film can be well controlled to inhibit the Marangoni flow and capillary flow caused by liquid evaporation, thereby forming a uniform and ultrathin Nafion-Li or Nafion membrane. The method solves the problem that the prior art cannot prepare an ultrathin and uniform ion-selective membrane. The Nafion-Li or Nafion membrane prepared according to the strategy exhibits high ion selectivity and lithium ion transmission flux in lithium batteries, effectively inhibits the shuttle effect of polysulfides, and improves the coulombic efficiency and energy efficiency of the batteries.

The invention relates to the technical field of fuel cells and polymer composite materials, and particularly discloses an organic-inorganic composite filling cross-linked proton exchange membrane and a preparation method thereof. According to the proton exchange membrane, bacterial cellulose is used as a three-dimensional porous framework, the surface of the bacterial cellulose is coated with a silicon dioxide, titanium dioxide or zirconium dioxide inorganic oxide layer in situ, and sulfydryl active sites are introduced through a sulfydryl-containing silane coupling agent; then, under ultraviolet irradiation, sulfydryl and 2-acrylamide-2-methyl propane sulfonic acid (AMPS) are subjected to a sulfydryl-alkene click reaction, a poly PAMPS continuous network covalently crosslinked with the inorganic framework is formed, pores are filled with the poly PAMPS continuous network, and a three-in-one composite structure with the organic framework, the inorganic enhancement layer and the sulfonic group conduction phase is constructed. Compared with the existing Nafion membrane or pure PAMPS membrane, the membrane disclosed by the invention has high proton conductivity, excellent mechanical strength, low swelling property and good chemical resistance stability, and is suitable for electrochemical devices such as fuel cells, water electrolysis hydrogen production and the like.

The invention relates to an underwater fuel cell technology, in particular to a single cell and a hydrogen fuel cell system with the same. Comprising an anode plate, a proton exchange layer and a peroxide layer which are sequentially arranged from front to back, a hydrogen inlet and a hydrogen outlet are formed in the left side and the right side of the anode plate respectively, and gas inlet flow channels are formed in the front end face and the rear end face of the anode plate, so that the gas inlet flow channels are arranged in a double-face mode; two openings are formed in the exchange layer and are respectively communicated with the hydrogen inlet and the hydrogen outlet, and hydrogen firstly enters through the hydrogen inlet. And the power generation process depends on the oxygen selection effect of the PTFE oxygen permeation membrane and the proton conduction of the Nafion membrane, so that a sustainable development scheme without an oxygen bottle is realized, and the practicability of underwater application is remarkably improved. And particularly, the PTFE film is used, so that the system is suitable for energy supply of underwater platforms such as submersible and deep sea detection equipment.

The application provides a low-loading IrO2 electrolytic water membrane electrode, a preparation method and application thereof, and the preparation method comprises the following steps: S1, dispersing iridium dioxide and a polymer in a mixed solution to obtain a spinning precursor solution; the mixed solution comprises a Nafion solution, water and isopropyl alcohol; S2, performing electrostatic spinning on the spinning precursor solution to obtain an IrO2 nanofiber layer; S3, performing hot pressing transfer printing on the Nafion membrane to form an anode catalytic layer; S4, spraying a cathode catalyst slurry on the other side of the Nafion membrane, and performing hot pressing to form a cathode catalytic layer, and finally obtaining the low-loading IrO2 electrolytic water membrane electrode. The low-loading IrO2 electrolytic water membrane electrode with high ordering degree, uniform and controllable fiber diameter and uniform catalyst particle distribution is constructed, the utilization rate of the catalyst is improved while the loading of the noble metal catalyst is reduced, the three-phase interface of the membrane electrode is enlarged, and the high activity is achieved in water electrolysis catalysis.

The invention discloses a sulfonated polyaryletherketone proton exchange membrane and a preparation method thereof, and belongs to the technical field of fuel cells, and the method comprises the following steps: synthesizing a BDHPM monomer, carrying out polycondensation, bromination, phosphonic acid grafting and sulfonation to obtain PhSPAEK-x, carrying out composite membrane casting with 2-methylimidazole, annealing, and carrying out sulfuric acid protonation and strong phosphoric acid doping to prepare a PA / MeIm-PhSPAEK-x membrane. According to the membrane, PhSPAEK-x is used as a matrix, imidazole and phosphoric acid are compounded, a phosphoric acid pool is formed inside, the maximum power density is larger than or equal to 118 mWcm <-2 > under 130 DEG C / 20% RH, the maximum power density is larger than or equal to 487 mWcm <-2 > under 80 DEG C / complete humidification, the phosphoric acid retention rate is larger than or equal to 50%, and the thermal decomposition temperature is gt; the temperature is 400 DEG C; the membrane is simple in preparation process, low in cost and free of fluorine pollution, can replace a Nafion membrane and is suitable for proton exchange membrane fuel cells.