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670 results about "Nafion" patented technology
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Nafion is a brand name for a sulfonated tetrafluoroethylene based fluoropolymer-copolymer discovered in the late 1960s by Walther Grot of DuPont. Nafion is a brand of the Chemours company. It is the first of a class of synthetic polymers with ionic properties that are called ionomers. Nafion's unique ionic properties are a result of incorporating perfluorovinyl ether groups terminated with sulfonate groups onto a tetrafluoroethylene (PTFE) backbone. Nafion has received a considerable amount of attention as a proton conductor for proton exchange membrane (PEM) fuel cells because of its excellent thermal and mechanical stability.
Integrated process for the production of viny acetate from acetic acid via ethy acetate
This invention provides an integrated three step economical process for the production of vinyl acetate monomer (VAM) from acetic acid in the vapor phase. First, acetic acid is selectively hydrogenated over a hydrogenating catalyst composition to form ethyl acetate which is cracked to form ethylene and acetic acid in the second step and in a subsequent step so formed ethylene and acetic acid is reacted with molecular oxygen over a suitable catalyst to form VAM. In an embodiment of this invention reaction of acetic acid and hydrogen over platinum and copper supported on silica selectively produces ethyl acetate in a vapor phase at a temperature of about 250° C., which is cracked over a NAFION catalyst to form ethylene and acetic acid at a temperature of about 185° C., which is mixed with molecular oxygen and reacted over a palladium / gold / potassium catalyst supported on titania to form VAM at a temperature of about 150° C. to 170° C.
Owner:CELANESE INT CORP
Polymer electrolyte membrane fuel cells
InactiveUS6946211B1Improve performanceImprove toleranceSolid electrolytesPrimary cellsThermoplasticGas diffusion electrode
A method for preparing polybenzimidazole or polybenzimidazole blend membranes and fabricating gas diffusion electrodes and membrane-electrode assemblies is provided for a high temperature polymer electrolyte membrane fuel cell. Blend polymer electrolyte membranes based on PBI and various thermoplastc polymers for high temperature polymer electrolyte fuel cells have also been developed. Miscible blends are used for solution casting of polymer membranes (solid electrolytes). High conductivity and enhanced mechanical strength were obtained for the blend polymer solid electrolytes. With the thermally resistant polymer, e.g., polybenzimidazole or a mixture of polybenzimidazole and other thermoplastics as binder, the carbon-supported noble metal catalyst is tape-cast onto a hydrophobic supporting substrate. When doped with an acid mixture, electrodes are assembled with an acid doped solid electrolyte membrane by hot-press. The fuel cell can operate at temperatures up to at least 200° C. with hydrogen-rich fuel containing high ratios of carbon monoxide such as 3 vol % carbon monoxide or more, compared to the carbon monoxide tolerance of 10-20 ppm level for Nafion®-based polymer electrolyte fuel cells.
Owner:DANISH POWER SYST
Reduction of the loss of zinc by its reaction with oxygen in galvanized steel and batteries
InactiveUS20070125644A1Improve Coulombic efficiencyMinimal porosityMachining electrodesFuel and primary cellsElectrochemical responseChemical reaction
A non-porous Zn2+ conducting inorganic lamellar layer is formed on the zinc coating of galvanized steel or on a zinc anode of an electrochemical cell. The layer reduces the rate of the unwanted chemical reaction of zinc and oxygen but allows desired electrochemical reactions underlying the cathodic protection of the steel and the efficient utilization of zinc anodes in electrochemical cells, e.g., a physiological buffer solution or serum as their electrolytes. The ion conducting non-porous lamellar layer having a hopeite phase Zn3(PO4)2.4H2O may be formed spontaneously on, e.g., NAFION® coated zinc anodes discharged in neutral pH saline phosphate solutions.
Owner:BOARD OF RGT THE UNIV OF TEXAS SYST
Non-noble metal catalyst for oxygen reduction, and preparation and application of catalyst
ActiveCN105749947AIncreased oxygen reduction activityHigh activityPhysical/chemical process catalystsCell electrodesReduction ActivityFreeze-drying
Disclosed is a non-noble metal catalyst for oxygen reduction. The catalyst comprises a flake-like graphene carrier; a nitrogen-doped carbon skeleton arranged between neighbor flake layers of the flake-like graphene carrier; the graphene flake layers are separated by the nitrogen-doped carbon skeleton; and nanometer particles are adhered to the flake layers of graphene. The nanometer particles are one or more than two of carbon-coated non-noble metal particles, carbon-coated non-noble metal carbide particles, and carbon-coated non-noble metal nitride particles. A preparation method of the non-noble metal catalyst for oxygen reduction comprises: adding graphite oxide and non-noble metal precursor salt into water; performing mixing and standing; adding nitrogen-containing micro-molecules, a Nafion solution, and an oxidizing agent; performing uniform mixing; allowing the obtained solution to be evaporated; performing freeze-drying; and performing temperature programming thermal treatment and other after-treatment to obtain the non-noble metal catalyst for oxygen reduction. The catalyst has advantages of high oxygen reduction activity, good mass transfer performance, and low price.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Microfluidic device for acoustic cell lysis
ActiveUS9096823B1Efficient couplingAvoid thermal lysisBioreactor/fermenter combinationsShaking/oscillating/vibrating mixersLysisMagnetic bead
A microfluidic acoustic-based cell lysing device that can be integrated with on-chip nucleic acid extraction. Using a bulk acoustic wave (BAW) transducer array, acoustic waves can be coupled into microfluidic cartridges resulting in the lysis of cells contained therein by localized acoustic pressure. Cellular materials can then be extracted from the lysed cells. For example, nucleic acids can be extracted from the lysate using silica-based sol-gel filled microchannels, nucleic acid binding magnetic beads, or Nafion-coated electrodes. Integration of cell lysis and nucleic acid extraction on-chip enables a small, portable system that allows for rapid analysis in the field.
Owner:NAT TECH & ENG SOLUTIONS OF SANDIA LLC
Lithium negative electrode protective film, preparation method and lithium metal secondary battery
ActiveCN109004276AHigh elastic modulusHigh mechanical strengthMaterial nanotechnologyFinal product manufactureSolid state electrolyteCopper foil
The invention relates to a lithium negative electrode protection film, a preparation method and a lithium metal secondary battery, belonging to the field of lithium metal secondary batteries. The lithium anode protective film is composed of lithium salt, ionic liquid, inorganic nanoparticles and lithium-treated Nafion polymer. Ionic liquids containing lithium salts are adsorbed on the surface of inorganic nanoparticles and uniformly dispersed in lithium-treated Nafion polymers. By arranging a mixed solution of lithium salts and ionic liquids; Mixing the mixed solution and the inorganic nanoparticles by sealed ball milling to obtain a quasi-solid electrolyte; The quasi-solid electrolyte is mixed with a lithium-treated Nafion polymer solution, coated on the surface of lithium or copper foil,and the protective film is prepared after the solvent is completely volatilized. As that lithium negative electrode protective film can inhibit the generation of lithium dendrite, the lithium negative electrode protective film has good mechanical properties and chemical stability, high lithium ionic conductivity and good film for performance; A lithium metal secondary battery provide with that lithium anode protective film has excellent electrochemical performance.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Novel ordering membrane electrode and preparation method and application thereof
ActiveCN102881925AReduce loadIncrease profitCell electrodesFuel cell detailsComposite electrolyteNanowire
The invention relates to a novel ordering membrane electrode and a preparation method and application thereof. The membrane electrode consists of a composite electrolyte membrane and a catalyst layer. The composite electrolyte membrane is a proton exchange membrane modified by Pd metal or Pd-Cu alloy or Pd-Ag alloy or Pd-Ni alloy or Pd-Ag-Ni alloy, the catalyst layer is an ordering catalyst layer which comprises a composite electrolyte membrane metal layer consists of conducting polymer nanowires distributed on the surface in an ordering array mode and Nafion self-assembled Pt-PDDA catalyst adhered to the surfaces of the conducting polymer nanowires. The novel ordering membrane electrode has the advantages of being low in Pt bearing capacity, high in utilization rate and the like and can effectively reduce the cost of a fuel-cell catalyst. In addition, the novel ordering membrane electrode can enhance mass transfer of fuel in the catalyst layer while effectively reducing liquid fuel penetration and accordingly improves the fuel utilization rate.
Owner:孙公权
Doped polyaniline directly-carbonized composite electrocatalyst, preparation method and application
Owner:HUNAN UNIV OF SCI & TECH
Proton exchange membrane materials for the advancement of direct methanol fuel-cell technology
A new class of hybrid organic-inorganic materials, and methods of synthesis, that can be used as a proton exchange membrane in a direct methanol fuel cell. In contrast with Nafion® PEM materials, which have random sulfonation, the new class of materials have ordered sulfonation achieved through self-assembly of alternating polyimide segments of different molecular weights comprising, for example, highly sulfonated hydrophilic PDA-DASA polyimide segment alternating with an unsulfonated hydrophobic 6FDA-DAS polyimide segment. An inorganic phase, e.g., 0.5–5 wt % TEOS, can be incorporated in the sulfonated polyimide copolymer to further improve its properties. The new materials exhibit reduced swelling when exposed to water, increased thermal stability, and decreased O2 and H2 gas permeability, while retaining proton conductivities similar to Nafion®. These improved properties may allow direct methanol fuel cells to operate at higher temperatures and with higher efficiencies due to reduced methanol crossover.
Owner:NAT TECH & ENG SOLUTIONS OF SANDIA LLC
Organic fuel cell methods and apparatus
InactiveUS20060204810A1Poor fuel wetting propertyImprove wettabilitySolid electrolytesFuel cells groupingElectrical batteryOrganic fuel
A liquid organic, fuel cell is provided which employs a solid electrolyte membrane. An organic fuel, such as a methanol / water mixture, is circulated past an anode of a cell while oxygen or air is circulated past a cathode of the cell. The cell solid electrolyte membrane is preferably fabricated from Nafion™. Additionally, a method for improving the performance of carbon electrode structures for use in organic fuel cells is provided wherein a high surface-area carbon particle / Teflon™-binder structure is immersed within a Nafion™ / methanol bath to impregnate the electrode with Nafion™. A method for fabricating an anode for use in a organic fuel cell is described wherein metal alloys are deposited onto the electrode in an electro-deposition solution containing perfluorooctanesulfonic acid. A fuel additive containing perfluorooctanesulfonic acid for use with fuel cells employing a sulfuric acid electrolyte is also disclosed. New organic fuels, namely, trimethoxymethane, dimethoxymethane, and trioxane are also described for use with either conventional or improved fuel cells.
Owner:CALIFORNIA INST OF TECH +1
Integrated process for the production of vinyl acetate from acetic acid via acetaldehyde
InactiveUS20100168466A1High selectivity and yieldOrganic compound preparationPreparation from ketenes/polyketenesAcetic anhydridePalladium
This invention provides an integrated multistep economical process for the production of vinyl acetate monomer (VAM) from acetic acid in the vapor phase. First, acetic acid is selectively hydrogenated over a hydrogenating catalyst composition to form acetaldehyde. Acetaldehyde so formed can be converted to ethylidene diacetate via reaction with acetic anhydride. In a subsequent step so formed ethylidene diacetate is thermally decomposed to form VAM and acetic acid. Alternatively, acetaldehyde formed in the first step can selectively be reacted with ketene to form VAM. In an embodiment of this invention reaction of acetic acid and hydrogen over platinum and iron supported on silica selectively produces acetaldehyde in a vapor phase at a temperature of about 300° C., which is selectively hydrogenated over platinum supported catalyst to form ethanol and dehydrated over NAFION catalyst to form ethylene at a temperature of about 185° C., which is mixed with molecular oxygen, acetic acid and reacted over a palladium / gold / potassium catalyst supported on titania to form VAM at a temperature of about 150° C. to 170° C.
Owner:CELANESE INT CORP
Preparation process of hydrogen fuel battery membrane electrode
ActiveCN106784944AIncrease profitReduce utilizationFinal product manufactureFuel cellsHydrogen fuel cellSlurry
The invention discloses a preparation process of a hydrogen fuel battery membrane electrode, and belongs to the field of battery membrane electrodes. The membrane electrode is prepared by the aid of an ultrasonic spraying process and a heat transfer printing process. The preparation process includes the steps: firstly, sequentially spraying a transfer printing medium with carbon powder slurry, electric catalyst slurry and binding agent slurry by the aid of the ultrasonic spraying process; secondly, loading a catalyst layer on a proton exchange membrane by the aid of the heat transfer printing process; finally, performing hot-pressing for self-made diffusion layers by the aid of the ultrasonic spraying process to obtain the membrane electrode. According to the preparation process, the diffusion layers are closely combined by the aid of actions among Nafion slurry, the proton exchange membrane and carbon powder slurry and the diffusion layers, electrochemical performance of the membrane electrode is greatly improved by the aid of the heat transfer printing process, the service life of the membrane electrode is prolonged, the problems such as wrinkle and swelling of the proton exchange membrane are solved, a lot of time for paving and treating the membrane is saved, and mass production of the membrane electrode is facilitated.
Owner:KUSN INNOVATION INST OF NANJING UNIV
Preparation method for ordered ultra-thin catalyst layer, catalyst layer and application
ActiveCN106159285AIncrease the reaction areaIncrease profitCell electrodesElectrical conductorProton
The invention relates to a preparation method for an ordered ultra-thin electrode of a proton exchange membrane fuel cell. The preparation method comprises the steps of preparing an ordered electrode structure and establishing an ultra-thin catalyst layer; a process of impregnating and annealing is carried out on a carbon paper to obtain TiO<2> seed crystals; then a TiO<2> nanorod is grown through a hydrothermal method; a TiN ordered array is prepared through NH<3> etching; and the array is loaded with a catalyst to establish the ordered ultra-thin catalyst layer without containing a proton conductor (such as Nafion). The established ordered ultra-thin catalyst layer can be used for the proton exchange membrane fuel cell, other fuel cells and electrochemical devices.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Process for preparing perfluorinated sulfonic resin solution by using waste ion exchange membrane in chlor-alkali industry
The invention discloses a method for preparing perfluoro sulfonic resin with abandoned ion exchange membrane in alkali-chloride industry, comprising following steps: swelling said abandoned ion with lower alcohol, emulsifying it with emulsion machine to resin particle, adding alcohol / water solvent and resin particle into autoclave, dissolving resin particle under high temperature and pressure and protection of nitrogen; getting solid mixture of perfluoro sulfonic resin and solution, separating with solid-liquid separation method and getting perfluoro sulfonic resin solution and solid perfluoro sulfonic resin. The resin solution is characterized by transparent, low content of foreign matter, high purity, similar property to that of Nafion EW 1100 solution, usage in field of mending ionic membrane pinhole and other mechanical damage, preparation of fuel battery proton exchange membrane and stereoscopic electrode and chemical catalysis.
Owner:SUNRISE POWER CO LTD
Side chain type sulphonation polyarylether ketone based on naphthalene ring and preparation thereof
The invention pertains to the chemical field of macromolecules, in particular relates to naphthalene ring based side-chain-type sulfonation polyaromatic ether ketone ketone with different degree of sulphonation and different lengths of side-chain obtained through the reaction of polyaromatic ether ketone ketone containing phenol hydroxynaphthoic acid and sultone as well as a preparation method of the sulfonation polyaromatic ether ketone ketone. The series of sulfonation polyaromatic ether ketone ketone polymer film can be widely applied to proton exchange membrane fuel cells. For instance, bisphenol A polyaromatic ether ketone ketone containing dibutyltin naphthalene acid prepared by the method has excellent proton conductivity performance, the proton conductivity of bisphenol A polyaromatic ether ketone ketone containing dibutyltin naphthalene acid group (SNPAEK-80) with sulphonation degree of 80 percent can reach more than 0.1 at the temperature of 60 DEG C and up to 0.18 at the temperature of 80 DEG C and the proton conductivity performance is higher than that of Nafion films.
Owner:JILIN UNIV
Preparation method of hydrogen evolution electric catalyst based on metal-organic framework compound
InactiveCN105289733AImprove the degree of ordered pore structureHigh degree of crystallizationOrganic-compounds/hydrides/coordination-complexes catalystsElectrodesPtru catalystOrganosolv
The invention discloses a preparation method of a hydrogen evolution electric catalyst based on a metal-organic framework compound. The method includes the following steps that 1, cupric acetate aquo-complex Cu (OAc) <2>H<2>O is dissolved in acetic acid for preparing a cupric acetate solution; 2, trimesic acid (H<3>BTC) particles are dissolved in absolute ethyl alcohol for preparing a trimesic acid solution; 3, the trimesic acid solution is transferred to and mixed with the cupric acetate solution; 4, the mixed solution is subjected to ultrasonic operation; 5, the mixed solution is placed in a centrifugal tube for centrifugal operation and activating treatment; 6, a centrifugal product obtained after activating treatment is placed in a drying oven for being dried; 7, after samples and organic solvent are mixed according to proportion, the Cu-MOF@Nafion hydrogen evolution catalyst is obtained. The obtained Cu-MOF@Nafion hydrogen evolution catalyst has unique physical properties of good transmission protons, good electrochemical stability is achieved, efficiency of a hydrogen evolution reaction can be improved, and the recycling service life can be greatly prolonged.
Owner:SOUTHWEST UNIVERSITY
Electrode production of fuel battery membrane with proton exchange membrane
ActiveCN1713424AIncrease contactTightly boundCell electrodesFinal product manufacturePtru catalystNafion
The method includes following steps: 1) the carbon paper or carbon fabric is dipped in PTFE latex, and then dried to get conduction base; 2) the VXCÊ72 carbon black or acetylene black is mixed with PTFE latex to form synthetic size that is coated on the conducting base; after drying, forms a gas diffusion layer; 3) prepares catalyst slurry; 4) the catalyst slurry is coated on the diffused layer; after hot pressing, it is cooled at the condition of keeping pressure, and the gas diffusion electrode is formed; 5) the Nafion film is set between two gas diffusion electrodes with catalysis layer; after hot pressing, it is cooled at the condition of keeping pressure.
Owner:BYD CO LTD
Composite type proteon exchange film for high-temp. direct methanol fue cell and preparation process thereof
InactiveCN1385915AImprove proton conductivityReduce penetrationLead-acid accumulator electrodesFuel cellsFuel cellsMethanol fuel
This invention relates to electric chemical fuel battery technology, the raw material of the compound proton exchange film with millimicron micropore structure used in the high temperature direct, carbinol fuel battery is processed with PVDF and PVA added by mixed inorganic multi-element acid millimicron ceramic powder by doctoblade hot pressure, brie-coated, rolling process or imprenated methods. The carbinol permeability at 80-180 deg.c in smaller than Nafion film with good performance of cardinal resistance, available in the operation at high temperature (above 100deg.c) of direct carbinolfuel battery proton exchange film.
Owner:SOUTH CHINA UNIV OF TECH
Method for preparing poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) composite modified electrode
InactiveCN102621206AHigh affinityReduce manufacturing costMaterial electrochemical variablesElectrochemical biosensorIonic liquid
The invention discloses a method for preparing a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) composite modified electrode. The method comprises the following steps of: uniformly mixing PEDOT:PSS aqueous dispersion liquid and Nafion, which are taken as raw materials, and then directly dispensing a mixture on the surface of a composite modified electrode; and in the conventional three-electrode system, performing secondary electrochemical doping by using hydrophobic ionic liquid, and thus obtaining the PEDOT:PSS composite modified electrode which is high in water resistance and high in conductivity. The PEDOT:PSS composite modified electrode which is prepared by the method fully combines the film-forming property of the PEDOT:PSS aqueous dispersion liquid, the adhesion characteristic, biological compatibility and anti-interference characteristic of the Nafion, high conductivity and hydrophobicity of the ionic liquid and the electrochemical catalysis characteristic of a nanometer material, can be applied to electrochemical biosensors or electrochemical sensors, is directly applicable to electrochemical detection of auxin, roxithromycin, vitamin C, benzenediol isomer, organophosphorus, glucose, hydrogen peroxide and the like, and has the characteristics of good detection effect, short response time, high water resistance, wide linear range, high sensitivity, high anti-interference, high stability and the like.
Owner:JIANGXI SCI & TECH NORMAL UNIV
Graphene/bismuth composite material and modifying method of screen printed electrode
InactiveCN104475752AHigh heavy metal ion detection repeatabilityPromote formationMaterial electrochemical variablesWater solubleRepeatability
The invention discloses a graphene / bismuth composite material and a modifying method of a screen printed electrode. A preparation method of the graphene / bismuth composite material includes dissolving and mixing to form a mixture containing 1-25mmol / L of water-soluble bismuth salt, 10-100mg / L of graphene oxide and 1-25mmol / L of reductant; heating to enable the mixture for reaction to obtain the graphene / bismuth composite material. The modifying methodincludes mixing the graphene / bismuth composite material at a mass ratio of 20-200:1 with Nafion liquid; coating a mixture on the screen printed electrode; drying to obtain a modified screen printed electrode with high heavy-metal ion detection repeatability. In addition, the preparation method is easy in raw material getting, convenient in synthesis, quick in reaction and free of pollution in the process of production, and large-scale production can be realized quickly.
Owner:FUPAIT ENVIRONMENT TECH SUZHOU
Micro direct methanol fuel cell membrane electrode and preparation method thereof
ActiveCN103022509AIncrease the effective surface areaImprove performanceCell electrodesFuel cell detailsPtru catalystEngineering
The invention discloses a micro direct methanol fuel cell membrane electrode and a preparation method thereof, and relates to a fuel cell and a preparation method thereof. The membrane electrode comprises an anode diffusion layer, an anode catalyst layer (3), a proton exchange membrane, a cathode catalyst layer (5) and a cathode diffusion layer, wherein the cathode catalyst layer (5) includes an inner layer (5a), an intermediate layer (5b) and an outer layer (5c); the outer layer (5c) is nearest to the cathode diffusion layer; and the inner layer (5a) is nearest to the proton exchange membrane. The preparation method comprises the following steps: taking carbon paper or carbon cloth as a supporting layer, then coating the diffusion layer formed by a carbon material, polytetrafluoroethylene and the like, coating a size formed by a catalyst, Nafion resin, a pore forming substance and the like for several times, and performing heat treatment and pressing to form the membrane electrode. The micro direct methanol fuel cell membrane electrode can inhibit the water permeation of the proton exchange membrane, enhance the splashing effect from the cathode to the anode, and improve the gas diffusion mass propagation speed.
Owner:INFORMATION SCI RES INST OF CETC
Preparation method of composite proton exchange membrane
ActiveCN101864163AInhibit swellingImprove proton conductivityFinal product manufactureCell component detailsElectrical conductorHeteropoly acid
The invention discloses a preparation method of a composite proton exchange membrane, comprising the following steps of: sulfonating, preparing a sulfonated polyether ether ketone solution; preparing polyaniline filter liquid, preparing membrane preparing liquid, casting to form a membrane, and the like. The composite membrane is prepared by using SPEEK (sulfonated polyether ether ketone) as a basal body and PANI (Polyaniline) and HPA (Heteropoly acid) as dopants, a material source is wide and does not need to be imported, a preparation process is simple, and used instruments are simple, thereby the cost of the membrane is reduced. A hydrogen bond formed by PANI and SPEEK is used for avoiding the swelling of the SPEEK and reducing methanol penetration, and the proton conductivity of the composite membrane is improved by the HPA. By changing the composition and the ratio between an alkaline polymer and a proton conductor, the novel PEM (proton exchange membrane) reaches optimum balance among high proton conductivity, low methanol penetration and low HPA dropout rate, the proton conductivity reaches 10-2S / cm, the methanol penetration rate of the composite proton exchange membrane is a half lower than that of an Nafion 117 membrane, and the HPA wastage rate does not reach 5 percent.
Owner:SUZHOU DACHENG YOUFANG DATA TECH CO LTD
Electrochemical sensor for sensitively detecting heavy metal cadmium ions and preparation method of electrochemical sensor
InactiveCN108318568AEnhanced electron transport capabilitiesImprove electrocatalytic performanceMaterial electrochemical variablesElectrochemical gas sensorPorous carbon
The invention aims at providing an electrochemical sensor for sensitively detecting heavy metal cadmium ions and a preparation method of the electrochemical sensor. The structure of the sensor is formed by an electrochemical workstation, an electrolytic cell and electrodes; the electrodes include a platinum wire counter electrode, a silver / silver chloride reference electrode and a working electrode, wherein the working electrode refers to a glassy carbon electrode adopting nitrogen-sulfur codoping and graphite porous carbon / Nafion / bismuth film modification. The electrochemical sensor can realize sensitive detection of trace heavy metal cadmium ions, the detection linear range is 4-80 micrograms / L, and the detection limit reaches 0.1 microgram / L. By combining with good properties of a bismuth film, a Nafion film and a nitrogen-sulfur codoped porous carbon material, the electrochemical sensor has the performances of high sensitivity, good selectivity, wide linear range, good reproducibility, good stability and the like and can be applied to detecting the heavy metal cadmium ions in an actual water sample.
Owner:HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
Preparation method of high-performance and voltage-reversal-resistant membrane electrode assembly
ActiveCN111082078AReduce corrosionImprove performanceCell electrodesFuel cellsPolyesterPtru catalyst
The invention provides a preparation method of a high-performance and voltage-reversal-resistant membrane electrode assembly. The method comprises the following steps: 1. sequentially adding a catalyst, an anti-reversal-electrode electrolyzed water catalytic material and a proper amount of nafion solution into a beaker, carrying out stirring for 10 minutes, adding a dispersing agent, and carryingout uniformly dispersing to obtain anode slurry; 2, spraying the anode slurry on the anode side of a proton exchange membrane; 3, adding a catalyst and a proper amount of nafion solution into a beaker, carrying out stirring for 10 minutes, adding a dispersing agent, and uniformly dispersing to obtain cathode slurry; 4, spraying the cathode slurry on the cathode side of the proton exchange membraneto obtain the required CCM; 5, applying 70kg / cm < 2 > of force to the prepared CCM, the gas diffusion layer and the polyester frame through an oil press, and performing hot pressing to prepare MEA; and step 6, assembling the prepared MEA into a single battery, and carrying out performance test and anti-reverse pole test. According to the invention, the anti-reverse-pole electrolytic water catalytic material is added into the anode catalytic layer, so that reverse poles caused by gas shortage can be effectively reduced.
Owner:SUNRISE POWER CO LTD
Electrolytic ozone generator and preparation technique for cathode catalysis layer thereof
InactiveCN101250710ALong continuous service lifeImprove current efficiencyElectrolysis componentsContinuous useDiamond electrodes
The invention relates to an electrolytic type ozone generator and a process for preparing a cathode catalyst layer of the electrolytic type ozone generator. The electrolytic type ozone generator comprises a round Nafion film, a round anode component and a round cathode component which are arranged on two axial sides of the Nafion film. The electrolytic type ozone generator adopts a diamond electrode which is doped with porous boron as an anode, the cathode catalyst layer adopts a process for preparing platinum-on-carbon and an electrolysis chamber for preparing ozone is optimally designed, not only the performance is greatly increased, but also the current efficiency of a borocarbon electrode to produce the ozone is greatly increased, the current efficiency can reach 30% under room temperature to the maximum, and the continuous service life of the electrodes can be greatly prolonged compared with lead dioxide electrodes which are used in a large number at present.
Owner:SHAANXI UNIV OF SCI & TECH
Electrochemical detection method for detecting trace heavy metal ions in water with modified graphene oxide composite modified electrode
ActiveCN105717174AMeet detectionFulfil requirementsMaterial electrochemical variablesOxide compositeMaterials science
The invention provides an electrochemical detection method for detecting trace heavy metal ions in water with a modified graphene oxide composite modified electrode. The method includes the steps that graphene oxide is ultrasonically dispersed into a Nafion solution containing bismuth, and GO-Bi-Nafion suspension is obtained; the polished, cleaned and dried surface of a glassy carbon electrode is uniformly coated with the GO-Bi-Nafion suspension, and a GO-Bi-Nafion / GCE is obtained. The developed graphene oxide material meets the requirements for detection and deep removal of heavy metal ions in water. The electrode material with high electrochemical activity has the advantages that sample treatment is easy, cost is low, the speed is high, and trace heavy metal can be detected when applied to electrochemical transducer rapid determination of heavy metal in water. In addition, the development of the heavy metal water pollution detection and treatment technology in China is promoted by the electrochemical detection method, and the modified graphene oxide composite modified electrode will have great economic and social benefits after industrialization.
Owner:山东济清科技服务有限公司
Method for preparing enzyme electrode with MWCNTs-TiO2/Nafion composite medium
InactiveCN101603940AExplanation of validityImprove catalytic abilityMaterial electrochemical variablesBiocompatibility TestingCore shell nanocomposites
The invention discloses a method for preparing an enzyme electrode with an MWCNTs-TiO2 / Nafion composite medium. In the method, MWCNTs-TiO2 core-shell nanocomposite materials are scattered into Nafion to prepare an organic-inorganic composite membrane as a fixed matrix for biological molecules for structuring a hemoglobin electrode, and a hemoglobin biosensor with fast response, high sensitivity and strong catalytic capacity is prepared by using the properties of large specific surface area, high surface reactivity, strong adsorption capacity, large electrical conductivity and the like of the MWCNTs-TiO2 core-shell nanocomposite materials and the properties of membrane forming, high chemical stability, high anti-interference capacity and the like of the Nafion. The biosensor has good biocompatibility, stability and repeatability, and has potential application in structuring biosensors. The sensor can be used for detecting the substances of hydrogen peroxide, trichloroacetic acid and the like, and has the advantages of low sensitivity, low detection limit and the like.
Owner:NANJING UNIV OF TECH
Method for preparing enzyme electrode and rapidly detecting peroxide value of vegetable oil
InactiveCN102435650BHigh sensitivityHigh precisionMaterial analysis by electric/magnetic meansVegetable oilHorse radish peroxidase
The invention belongs to the field of food detection, and particularly relates to a method for preparing an enzyme electrode and rapidly detecting the peroxide value of vegetable oil. The method comprises the steps of: selecting a glassy carbon electrode for use; firstly preparing a Nafion-methylene blue membrane electrode, then adopting a bovine serum albumin-glutaraldehyde crosslinking method to fix horse radish peroxidase (HRP), and obtaining a final HRP electrode; and then using the HRP electrode to rapidly detect the peroxide value of the vegetable oil. The method is high in sensitivity, good in selectivity, high in accuracy, short in response time, less in interference and superior to the traditional iodometry, thus being a simple, rapid, convenient and easy method for measuring the peroxide value and having the potential of realizing automatic on-site measurement.
Owner:HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
Pt nano particle-carbon nano tube composite material, preparation method and application thereof
InactiveCN101624171AEvenly distributedChange contentIndividual molecule manipulationMetal/metal-oxides/metal-hydroxide catalystsElectrochemical biosensorCarbon nanotube
The invention provides a Pt nano particle-carbon nano tube composite material, a method and an application thereof. The invention is characterized in that ammonia is used for pretreating the carbon nano tube; the carbon nano tube pretreated by the ammonia, sodium citrate, chloroplatinic acid and methanol are used as raw materials; and Pt nano particles are reduced on the outer wall of the carbon nano tube in situ. The weight ratio of the carbon nano tube and chloroplatinic acid, the proportion of the methanol and the sodium citrate and the types of carbon nano tube are improved to obtain the Pt nano particles with smaller particle size and even distribution to wrap the carbon nano tube. The composite material is dispersed in Nafion solution, the mixed solution is dripped on a glassy carbon electrode for natural drying and a thin film modified electrode can be prepared. The electrode has excellent electrocatalytic performance to oxidation reaction of H2O2 and methanol. The method has simple technique, convenient operation, low cost and easy obtaining for the used raw materials, has good application prospect in the electrocatalytic biological sensor and a methanol fuel battery and is applicable to industrial production.
Owner:SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
Method for preparing anode of microorganism fuel battery with graphene and ferrous disulfide compound
ActiveCN106784829AImprove performanceLower anode electron transfer resistanceCell electrodesBiochemical fuel cellsIonCvd graphene
The invention discloses a method for preparing the anode of a microorganism fuel battery with a graphene and ferrous disulfide compound, and belongs to the field of environments, materials and energy. The method comprises the following steps: (1) gradually dropping a ferric trichloride and thiourea solution into a graphene oxide dispersion in a reaction kettle one droplet by one droplet, uniformly stirring, sealing the reaction kettle, and performing hydrothermal reaction for 12-24 hours within 140-200 DEG C so as to obtain a hydrogel sample; (2) washing the hydrogel sample for times with deionized water, performing freeze-drying, and crushing so as to obtain a nano powder of the graphene and ferrous disulfide compound; (3) mixing the nano powder with a 5% nafion solution, isopropanol and deionized water, uniformly oscillating, coating carbon cloth with the solution, fixing the carbon cloth with a fixing part, and drying the carbon cloth in air, so as to obtain the anode. The method has the advantages that the synthesis steps are very simple, obtained particles are uniform in morphology, graphene lamellas are overlapped to form a well-developed porous structure, good electrochemical properties and biocompatibility can be achieved, and the anode of the microorganism fuel battery has very good properties.
Owner:HARBIN INST OF TECH
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