25 results about "Nafion" patented technology

The application discloses a kind of glucose oxidase sensors based on modified multi-walled carbon nanotube modification, it is related to glucose oxidase sensor technical field, including the following steps: (1) modified multi-walled carbon nanotube preparation;(2) glassy carbon electrode is carried out surface polishing treatment;(3) obtain modified multi-walled carbon nanotube dispersion;(4) obtain glucose oxidase liquid;(5) glucose glucose oxidase liquid impregnation electrode;(6) using Nafion solution covers electrode;The sensor obtained after the electrode is modified by introducing modified multi-walled carbon nanotube in the application, not only has higher glucose detection sensitivity, but also has excellent stability.

The application discloses a preparation method of a novel catalyst coated membrane (CCM) functional layer, and belongs to the technical field of membrane electrode assemblies (MEA) of proton exchange membrane fuel cells (PEMFC). 2 The SiO2 with a nominal BET of 150 m 2 / g and a 20 wt% Nafion solution are configured into a solution, and the solvent for the solution is a mixture of isopropyl alcohol and water, wherein the mass ratio of Nafion to oxide is 1; S2, the slurry is subjected to 14 h ball milling and 30 min ultrasonic removal of agglomeration; S3, the SiO2 / Nafion slurry is sprayed onto the PEM cathode / anode surface by using an ultrasonic spraying instrument; S4, the catalyst slurry with an I / C ratio of 0.6 is sprayed onto the PEM cathode / anode surface to which the reinforced functional layer has been added by using the ultrasonic spraying instrument; and S5, the conventional MPL, GDL, sealing ring, flow channel, bipolar plate, insulating plate and clamp are pressed and assembled, and no additional sealing is required. By adding the functional layer, the water retention capacity of the membrane electrode is significantly improved, so that the membrane electrode can still maintain excellent proton conduction and output high power under low-humidity working conditions.

The present application relates to the technical field of biosensor, especially to a glucose sensor based on composite film and a preparation method thereof, after fixing layered MoS2 semiconductor material on a substrate, the present application continues to prepare ion gel film on the substrate, then modifies glucose oxidase on the surface of the ion gel film, after incubation and fixation, modifies a layer of Nafion film on the surface of the ion gel film, because glucose oxidase oxidizes and decomposes glucose to generate protons, with the selective proton passing effect of the Nafion film, the protons pass through the Nafion film to the porous network structure formed by the ion gel film and the layered MoS2 semiconductor material, and cooperate with the cations in the ion gel film to attract more carriers, and form a double-layer structure on the surface of MoS2, cooperate with the current multiplication effect, improve the transmission efficiency of the carriers, and improve the sensitivity of the sensor.

The detection method can be used to detect the presence of uranium hexafluoride (UF6) in a gas stream (G). The detection method comprises humidifying the gas stream by circulating the gas stream (G) in contact with a sulfonated tetrafluoroethylene-based fluoropolymer copolymer, in particular Nafion, and then detecting the presence of hydrogen fluoride (HF) in the gas stream (G) by means of a sensor.

This invention discloses a method for preparing a boron-doped self-supporting three-dimensional non-metallic carbon-based catalytic electrode and its application in electrocatalytic nitrogen reduction. Using starch, boric acid, and sodium carboxymethyl cellulose as raw materials, the boron-doped self-supporting three-dimensional non-metallic carbon-based catalytic electrode is obtained through freeze-drying and carbonization, or freeze-drying, pre-carbonization, and carbonization. This electrode can be used as a catalytic cathode for the electrochemical reduction of nitrogen. The product exhibits rich morphology and porosity. Boron doping intensifies the hybridization of the electronic structure and increases defects. This change effectively regulates nitrogen adsorption to promote the entire electrochemical reduction of nitrogen, resulting in an ammonia yield of 10 μg·h⁻¹. ‑1 ·mg ‑1 The invention eliminates the need for complex steps such as Nafion and carbon cloth treatment, making it convenient, efficient, and low-cost. The boron-doped self-supporting three-dimensional non-metallic carbon-based catalytic electrode produced is virtually pollution-free when discarded and easy to recycle.

The application discloses a preparation method and application of a porous ceramic substrate electrochemical gas sensor, and the method comprises the following steps: pressing Fe, Mn and Al2O3 composite ceramic powder into a porous ceramic blank, and firing to obtain a porous FeMn@Al2O3 ceramic substrate; printing platinum paste on the FeMn@Al2O3 ceramic substrate, and sintering to obtain a porous electrochemical gas sensor substrate; dotting catalyst slurry on working electrodes and counter electrodes on the modified porous electrochemical gas sensor substrate, uniformly coating pretreated nafion solution on surfaces of the working electrodes and the counter electrodes after drying, and drying and solidifying to form a proton exchange membrane; dotting dilute sulfuric acid solution on the proton exchange membrane, and sealing one side of the whole electrode by using silica sol, so that the porous ceramic substrate electrochemical gas sensor is obtained. The electrochemical gas sensor has the advantages of good selectivity, high stability, simple preparation, low cost, strong adaptability, environmental friendliness and the like.

The application provides a method for improving the performance of Ru-MnO2 catalyst slurry based on liquid-electric effect. The catalyst is dispersed in 500 μL of deionized water, 500 μL of isopropyl alcohol and 20 μL of Nafion, and then subjected to liquid-electric effect treatment by applying a pulse voltage between two parallel carbon paper electrodes, and at the same time, the slurry is placed in an ice bath to maintain the temperature at 0 DEG C. The slurry after liquid-electric effect treatment is subjected to ice bath ultrasonic dispersion. The Ru-MnO2 catalyst slurry obtained is uniform and has superior catalytic performance. The experiment shows that the sample treated for 20 minutes has the lowest overpotential and the best catalytic activity at 10 mA / cm 2 current density in 0.5 M H2SO4, and the catalytic activity is the best. The method is simple in operation, green and environmentally friendly, has high controllability and good repeatability.

提供了一种可再充电锂离子电池。电池包括具有集流体的正极和涂覆在集流体上的电极活性层。电极活性层包括正极活性材料和与正极活性材料和液体电解质直接接触的锂化Nafion(Li‑Nafion)。Li‑Nafion直接沉积在正极材料的外表面积上，使得Li‑Nafion成为液体电解质和正极材料之间的界面。Li‑Nafion可以沉积为覆盖单个正极材料颗粒的外表面的一部分的涂层或多个颗粒。具有Li‑Nafion覆盖的正极材料颗粒的正极提供了改进的放电率性能、循环稳定性以及快速充电能力，这是由高电压稳定性和锂离子传导能力产生的。

Method and system for detecting a uranium hexafluoride leak. The detection method allows for the detection of the presence of uranium hexafluoride (UF6) in a gas stream (G). The detection method comprises humidifying the gas stream by circulating the gas stream (G) through contact with a copolymer fluoropolymer based on sulfonate tetrafluoroethylene, in particular Nafion, and then detecting the presence of hydrogen fluoride (HF) in the gas stream (G) using a sensor. Figure for the abstract: Figure 1

A lithium-mediated electrochemical method for ammonia synthesis, relating to the field of ammonia synthesis technology, solves the technical problems of severe side reactions, limited nitrogen mass transfer, and poor interfacial stability in existing lithium-mediated ammonia synthesis systems. Tetra(4-formylphenyl)porphyrin iron and an amino-containing multifunctional organic ligand are added to a mixed solvent of n-butanol and o-dichlorobenzene. An acid catalyst is added, and after stirring until homogeneous, the mixture is degassed and sealed for reaction. The solid product is collected by centrifugation, washed, and dried to obtain COF powder. This powder is then added to an ethanol-water solution, followed by ultrasonic dispersion with Nafion solution. The powder is then drop-coated / sprayed onto the surface of a carbon paper current collector and dried. This powder is used as the working electrode, with a platinum mesh as the counter electrode, a platinum wire as the quasi-reference electrode, and a LiBF4 tetrahydrofuran solution as the electrolyte. Ethanol is used as the proton donor, and electrolysis is performed under a nitrogen atmosphere using a constant current. This invention can be applied to the field of ammonia synthesis technology.

Provided are a cathode catalyst layer and a preparation method and use thereof, and a fuel cell. The method includes: mixing a catalyst, water, and an alcohol with a pore-forming agent to obtain a mixture; dispersing the mixture into a Nafion solution to obtain a slurry; and coating the slurry onto a surface of a diffusion layer to obtain a coated diffusion layer, and subjecting the coated diffusion layer to calcination and freeze-drying in sequence to obtain the cathode catalyst layer.

The application discloses a kind of glucose oxidase sensors based on chitosan modification, it is related to glucose oxidase sensor processing technical field, comprising the following steps: (1) modifier preparation;(2) obtain pretreated electrode;(3) obtain modified electrode;(4) the modified electrode is soaked in glucose oxidase liquid, then take out, PBS phosphoric acid buffer elution, after drying, again carry out surface drop Nafion solution, again carry out drying, enzyme is fixed to electrode surface, and glucose oxidase sensor is prepared;The application provides a kind of glucose oxidase sensors based on chitosan modification, after the combination of multiple processing of the application, the current response sensitivity of glucose oxidase sensor can be significantly improved, by the improvement of current response sensitivity, detection accuracy can be further improved, and the detection range and detection limit are obviously improved.

The application discloses a preparation method of an electrochemical sensor based on a hollow bowknot structure SeVs-LaSe2-CoSe2 / C nano material, a La1Co1-MOF precursor is synthesized through a one-step solvothermal method, a SeVs-LaSe2-CoSe2 / C sensing material is obtained by doping selenium powder and high-temperature pyrolysis, and the sensing material is gradually modified with acetylcholinesterase (AChE), Nafion and a clean glassy carbon electrode surface, so that an AChE-NF / SeVs-LaSe2-CoSe2 / C / GCE biosensor electrode is finally prepared; the method is simple and easy to control, the obtained material is a bowknot structure formed by super-thin hollow nanotubes, the electrochemical active surface area is increased, more active sites are provided for AChE loading, and the electrochemical performance of the sensor is greatly improved.

The application relates to a rGO loaded copper monatomic catalyst / g-C3N4 composite electrode material, a preparation method thereof and application, and relates to the technical field of uranium resource recovery and water treatment. The foregoing preparation method comprises the following steps: dissolving melamine in deionized water, stirring and dissolving, and then performing heating treatment; the obtained product is subjected to solid-liquid separation, washing and drying, and then is subjected to heat treatment in an inert atmosphere to obtain g-C3N4; graphene, copper oxalate and chitosan are added into an acidic aqueous solution, stirred, dried, and then subjected to heat treatment in an inert atmosphere to obtain a rGO loaded copper monatomic catalyst; the rGO loaded copper monatomic catalyst and the g-C3N4 are dispersed in an organic-water mixed solvent containing Nafion, and then phytic acid is added; the catalyst ink is obtained through ultrasonic treatment; the catalyst ink is coated on the surface of a substrate, and then dried to obtain the composite electrode material. The composite electrode material prepared by the application can realize efficient and high-selectivity photoelectrocatalytic reduction of uranium in water bodies such as uranium-containing wastewater, seawater, concentrated salt water of seawater desalination, concentrated seawater of a seawater salt factory, salt lake water and the like.

The application discloses a coating, a zinc negative electrode with the coating and a preparation method and application thereof. The coating is a Nafion film containing inorganic quantum dots; wherein the mass fraction of the inorganic quantum dots is greater than 50%. The thickness of the coating is 1-80 microns. The coating has the physical isolation of an organic layer and the high electrochemical activity of an organic layer, reduces dendrites and side reactions, and greatly improves the cycle performance of a zinc ion battery. The coating has the advantages of both the organic layer and the inorganic layer. The Nafion film is composed of hydrophilic and hydrophobic regions and has been proved to play an active role in zinc plating / demetalization and dendrites. The quantum dots have a large specific surface area, a semiconductor structure, small size quantum confinement and edge effects, are stable and easy to form composites, doped and functionalized. The quantum dot modified electrode has better electrochemical activity, conductivity and increased electron transmission path.

The application provides an electrochemical vat dyeing device and method. The electrochemical vat dyeing device is provided with a cathode chamber and an anode chamber, a cathode plate is arranged in the cathode chamber, and an anode plate is arranged in the anode chamber; a PES film coated with nano-particles is used as a diaphragm between the cathode chamber and the anode chamber; wherein the nano-particles include Ti4O7 nano-particles, CeO 2‑x at least one of ZrO2 nano-particles and CeO2 nano-particles, 2>x>0, and 2>y>0. 2‑y The electrochemical vat dyeing device provided by the application uses a PES film coated with ZrO2 nano-particles as a diaphragm, replaces a traditional Nafion film, and can be well applied to an electrochemical vat indigo process and is a good electrochemical vat indigo dyeing device. The electrochemical vat dyeing device provided by the application is used in an electrochemical vat indigo process, and realizes high current efficiency for electrochemical vat indigo under the premise of high-efficiency isolation of leucoindigo at low cost.

The application discloses a catalyst electrode suitable for carbon dioxide electro-reduction and a preparation method and application thereof in carbon dioxide electro-reduction. The preparation method comprises the following steps: dissolving cuprous oxide and a Nafion solution in a solvent to form a solution A; adding arginine into the solution A and uniformly mixing to obtain a catalyst ink; and coating the catalyst ink on a surface of a substrate and removing the solvent to obtain the catalyst electrode suitable for carbon dioxide electro-reduction. The application changes the structure of the binder Nafion by introducing arginine, so as to change the microenvironment of the catalyst surface, destroy the hydrogen bond network, inhibit the hydrogen evolution reaction, and promote the C-C coupling reaction.

This invention relates to the field of calcium-ion battery technology, specifically to an electrochemical activation method for PTCDI electrode material, which includes the following steps: (1) placing a 0.5M CaCl2 aqueous solution as the electrolyte in an electrolytic cell; (2) preparing a slurry from PTCDI, super P and Nafion film solutions, and coating the prepared slurry onto a carbon fiber paper substrate; (3) thoroughly drying the carbon fiber paper electrode coated with the slurry to obtain an electrode sheet; (4) placing the obtained electrode sheet in the electrolyte for electrochemical activation, and finally obtaining a calcium-ion battery negative electrode; (5) conducting electrochemical performance tests on the PTCDI negative electrode material. The electrochemical activation method for PTCDI electrode material of this invention can effectively increase the wettability between the PTCDI electrode and the electrolyte, and effectively improve its discharge specific capacity.

The application belongs to the technical field of solar cells, and discloses a PEDOT:PSS / Nafion composite film, a gallium arsenide-based heterojunction solar cell and a preparation method. The solar cell comprises a back electrode, a gallium arsenide substrate, a composite layer, a window layer and a front electrode. The product is obtained by spin coating PEDOT:PSS and Nafion on the gallium arsenide substrate through a spin coating process to form the composite layer composed of the PEDOT:PSS / Nafion composite film, which can reduce the series resistance of the device, accelerate the separation and transportation of carriers, significantly improve the photoelectric conversion efficiency of the device, has high light transmittance and excellent conductivity, and the solar cell combined with the gallium arsenide substrate has higher open-circuit voltage and excellent conversion efficiency. Meanwhile, the product also has a passivation effect, improves the interface properties between the product and the substrate, reduces the recombination of carriers at the interface, and then improves the performance of the semiconductor device.

The application discloses a current collector, a preparation method and application thereof. The current collector comprises a current collector substrate and a modification layer arranged on at least one surface of the current collector substrate; the modification layer comprises a Cu-ZnO composite material and a lithiated Nafion. The current collector has simple structure, low cost and good lithium affinity, can effectively inhibit the formation of dendrites, reduce the risk of cracking, and improve the cycle stability and safety of a battery.

This invention relates to the field of medical device technology, and more particularly to a microneedle sensor and its application, and an intelligent microneedle closed-loop system. The microneedle sensor includes: a microneedle working electrode, a microneedle electrode, and a microneedle reference electrode; the microneedle working electrode includes: a hollow microneedle and a carbon aerogel composite filled inside the hollow microneedle; the carbon aerogel composite is composed of carbon aerogel, mineral oil, glucose oxidase, tetrathionene, and Nafion solution. This microneedle sensor has high sensitivity (0.0448 mA / (cm²)). 2 It exhibits a wide linear range (0.25-30 mM) and strong anti-interference properties, maintaining 80% activity even after 5 days. Furthermore, this invention utilizes a microneedle sensor to construct an intelligent microneedle closed-loop system, enabling real-time blood glucose monitoring and on-demand drug delivery with no tissue inflammation even after seven days of continuous wear.

The present invention relates to an electrolyte membrane comprising a bipolar metal selective proton conductor. A hydrogen storage alloy is introduced therein to conduct, without hydration, protons, thereby enabling crossover to be completely blocked, and has excellent mechanical strength, and thus can replace a conventional Nafion electrolyte membrane. In addition, if the electrolyte membrane is applied to a proton-exchange membrane for a fuel cell, electrochemical performance of the fuel cell can be improved.

The application discloses a modified ionomer, which comprises a Nafion solution and an aliphatic multifunctional monomer. The modified ionomer provided by the application inhibits the agglomeration of the ionomer and IrO2 by using the aliphatic multifunctional monomer to self-assemble with the side chain sulfonic acid groups of the ionomer, the uniform distribution of the ionomer and the IrO2 catalyst improves the proton and electron transmission capacity, the porous structure promotes the gas and water transmission, and thus an anode catalyst layer with more micropores and more uniform distribution of the ionomer and the catalyst is obtained. The application further discloses a modification method of the modified ionomer and application of the modified ionomer in a membrane electrode. Test tests show that the membrane electrode prepared from the modified ionomer can make the electrolytic tank performance reach 2.98 A cm ‑2 @1.9 V 0.5 mg cm ‑2 , the catalyst utilization rate reaches 0.053 g Ir ·kW ‑1 , which is almost half of the target of 0.1 g Ir ·kW ‑1 of the International Renewable Energy Agency (IRENA) in 2026, and has good economic and social benefits.