257 results about "Gas diffusion electrode" patented technology

The invention relates to the technical field of air electrode preparation, in particular to a metal-loaded super-hydrophobic air electrode, a preparation method and chlorine production application, the air electrode comprises a high-hydrophobicity gas diffusion layer obtained through polytetrafluoroethylene modification, and the metal-loaded super-hydrophobic air electrode is prepared through a corona etching and electrochemical in-situ deposition technology. A uniform and highly-dispersed metal catalyst layer directly grows on the surface of the polytetrafluoroethylene substrate, so that the gas diffusion electrode with excellent mass transfer performance and an efficient catalytic function is obtained; the prepared electrode is used for carrying out electrochemical catalysis on a water body containing chloride ions by adopting a cyclic voltammetry method, and active chlorine can be efficiently generated in situ; the prepared metal-loaded super-hydrophobic air electrode has the advantages of being low in oxygen mass transfer resistance, high in catalyst utilization rate, free of generation of by-products, capable of efficiently generating active chlorine and the like, and has wide application potential in actual water environment disinfection.

The present application relates to a kind of full solid-state lithium ion membrane reactor with symmetrical structure and its application, the reactor is in situ construction on the both sides of solid-state lithium ion conductor film with Pt and / or Ni as catalyst, with single-walled carbon nanotube etc. Conductive material is used as current collector gas diffusion electrode, the reactor can work in nitrogen hydrogen mixture atmosphere, integration is high, scale is flexible.The present application changes the working mode of traditional reactor using liquid electrolyte, replaces inefficient nitrogen and proton mass transfer with efficient lithium ion mass transfer, couples lithium-mediated nitrogen reduction and hydrogen oxidation reaction to synthesize ammonia, and the maximum working current density is increased to 1000mA / cm 2 , and can work at 40mA / cm 2 Current density for a long time, with innovation and broad industrial application prospect.

Catalyst system for catalyzed electrochemical reactions comprising an electrically conductive support and a catalyst comprising indium and bismuth and zinc wherein the amount of zinc is 1- 50 wt.% based on the total amount of indium and bismuth and zinc, and gas-diffusion electrode comprising such catalyst system, electrochemical cell containing said gas-diffusion electrode and method for the electrochemical reduction of carbon dioxide with the help of such catalyst system.

The invention discloses an electro-catalysis device for promoting peracetic acid synthesis by using anode oxygen and a process method, and relates to the technical field of peracetic acid synthesis. Comprising a cathode cover plate, a gas runner chamber, a cathode chamber, an anode chamber and an anode cover plate which are arranged in sequence, a gas diffusion electrode is adopted as a cathode, a rhombic titanium mesh coated with IrO2 is adopted as an anode electrode, the gas diffusion electrode is located between the gas runner chamber and the cathode chamber, the anode electrode is located between the cathode chamber and the anode chamber, and the anode cover plate is located between the cathode chamber and the anode chamber. A proton exchange membrane is arranged between the anode electrode and the cathode chamber, an anion exchange membrane is arranged between the gas diffusion electrode and the cathode chamber, and the gas diffusion electrode and the anode electrode extend to the outside through a copper adhesive tape. According to the method, the electro-catalysis device is constructed, high-concentration hydrogen peroxide on a catalyst interface is utilized, and oxygen generated by excavating the anode is used as a source of cathode oxygen, so that the yield of the peracetic acid is greatly increased, and in-situ generation of the peracetic acid and excavation of the oxygen generated by the anode are realized.

The invention discloses a hydrophobic gas diffusion electrode loaded with silver nanoparticles and application of the hydrophobic gas diffusion electrode in electrocatalytic carbon dioxide reduction, and belongs to the technical field of electrocatalysis. The hydrophobic gas diffusion electrode comprises a gas diffusion layer and a catalyst layer sprayed on the gas diffusion layer; the catalyst layer comprises a silver nanoparticle catalytic material, a first ionomer and a second ionomer; wherein the first ionomer is a fluororesin ionomer, and the second ionomer is a quaternized polysulfone ionomer. A system for preparing CO by reducing CO2 through electro-catalysis is constructed, the system comprises an MEA electrolytic cell, a cathode, an anode and an anion exchange membrane, and the cathode adopts the hydrophobic gas diffusion electrode loaded with the silver nanoparticles. The preparation method is mild in preparation condition and environmentally friendly, the modified hydrophobic gas diffusion electrode has high hydrophobicity, efficient conversion of CO2 can be achieved under the high current density, FECO can reach 96.5% under the high current density, and excellent catalytic performance is shown.

The invention provides a Bi-doped SnO catalyst and a preparation method and application thereof, a gas diffusion electrode and a preparation method and application thereof, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: mixing divalent metal tin salt, a regulator and bismuth salt in water to obtain a mixed solution; and mixing the mixed solution with a sodium hydroxide solution, and reacting to obtain the Bi-doped SnO catalyst. The preparation method is simple, rapid, low in cost, green and free of organic solvent or high-temperature treatment, and the prepared catalyst is stable in structure and lasting in performance. The Faraday efficiency of a gas diffusion electrode prepared by adopting the Bi-doped SnO catalyst for synthesizing formic acid through electrocatalytic reduction of CO2 at-850 mA / cm < 2 > is as high as 98%, the gas diffusion electrode can stably run for more than 140 h under N2 purging in a solid electrolytic tank, and the concentration of formic acid continuously produced exceeds 5 mol / L.

This utility model discloses a device for preparing a gas diffusion electrode, comprising: a bottom support plate and a diffusion electrode carrier limiting groove, wherein the diffusion electrode carrier limiting groove is disposed on the upper end of the bottom support plate; and a roller baffle disposed on the outer side of the upper end of the bottom support plate. This device for preparing a gas diffusion electrode uses a handle to move the front and rear slurry coating rollers on the roller movement track groove, making the coating process more controllable. Different specifications of the structure can be selected according to usage needs, facilitating large-scale use. By pulling the movement of the front and rear slurry coating rollers and connecting the pump connecting hose to the slurry output connector, controllable and uniform preparation of the electrode catalyst is achieved, providing a simple and effective method and equipment for large-scale mass production.

According to the membrane-free electrochemical energy storage device, in the thickness direction of a partition plate, a first energy storage device and a second energy storage device are arranged on the two sides of the partition plate correspondingly and connected with the partition plate; the first energy storage device comprises a first end plate, a first sealing gasket, a first current collector, a first gas diffusion electrode, a first porous membrane, a first auxiliary electrode, a second porous membrane, a first porous electrode, a second current collector and a second sealing gasket; the second energy storage device comprises a second end plate, a third sealing gasket, a third current collector, a second gas diffusion electrode, a third porous membrane, a second auxiliary electrode, a fourth porous membrane, a second porous electrode, a fourth current collector and a fourth sealing gasket; the metal strip is connected between the first auxiliary electrode and the second auxiliary electrode. Therefore, the membrane-free electrochemical energy storage device provided by the invention can perform short-term energy storage and can also perform long-term energy storage, and the energy storage effect and the energy storage cost can be both considered.

The present invention relates to a gas diffusion electrode comprising a metal M selected from Ag, Au, Cu, Pd and mixtures and / or alloys and / or salts thereof and at least one binder, wherein the gas diffusion electrode comprises hydrophilic and hydrophobic pores and / or channels, wherein an ion transport material is at least partially contained in the pores and / or channels of the gas diffusion electrode and / or an ion transport material is at least partially applied to the surface of the gas diffusion electrode; the present invention also relates to a method for preparing the gas diffusion electrode, the use of the gas diffusion electrode in the reduction of CO2 and / or CO, and an electrolysis cell and an electrolysis system each comprising the gas diffusion electrode.

Systems and methods of the various embodiments may provide bifacial sealed gas diffusion electrode (GDE) assemblies. In some embodiments, a bifacial sealed gas diffusion electrode (GDE) assembly includes active electrode layers on two opposing sides of the assembly. Various embodiments may provide architecture and / or sealing methods for GDE assemblies. In various embodiments, the GDE assemblies may be for use in devices. In various embodiments, the devices may be primary or secondary batteries. In various embodiments, these devices may be useful for energy storage. For example, bifacial sealed GDE assemblies of the various embodiments may form cathode electrodes (sometimes called air electrodes) of a battery, such as a metal-air battery.

This invention discloses a platinum-based catalyst for the hydrogenation reaction, its preparation method, and an electrode. The catalyst uses orthorhombic niobium pentoxide (T-Nb₂O₅) as a support to support the active component platinum. The support is resistant to strong acids and electrochemical corrosion at potentials above 1.0 V (vs RHE). The catalyst exhibits a hydrogenation reaction current density of not less than 200 mA·cm⁻¹ at 0.45 V (vs RHE). ‑2 In preparation, ammonium niobate oxalate hydrate was used as the niobium source, and the mixture was gelled via a sol-gel method. The gel was then heat-treated at 600-700℃ to obtain an orthorhombic niobium pentoxide support. The pH was adjusted to less than 3, and platinum was reduced with sodium borohydride to prepare the catalyst. This catalyst was then used to fabricate a hydrogen depolarization anolyte gas diffusion electrode with a platinum loading of 0.5-1.0 mg·cm³. ‑2 It can operate continuously and stably for no less than 120 hours with a cell voltage in the range of 1.25-1.45V. The catalyst of this invention has high activity and excellent stability, and can be used as a hydrogen depolarization anode in hydrometallurgy, significantly reducing electrolysis energy consumption and making it suitable for industrial applications.

The present invention relates to a method for achieving efficient electrocatalytic hydrogenation using a metal-free heterocyclic molecular catalyst. The method comprises using a five-membered or six-membered heterocyclic organic compound as the metal-free molecular catalyst, assembling an electrolytic cell using a gas diffusion electrode loaded with the metal-free molecular catalyst as the cathode and a corresponding anode, and an anion exchange membrane (or proton exchange membrane) as the cathode and anode separator, to perform the electrocatalytic semi-hydrogenation of alkynes. The method achieves activity and selectivity comparable to or even exceeding that of conventional metal catalysts during the electrocatalytic hydrogenation process.

The application discloses a kind of silicon dioxide carbon tube membrane electrode and its construction method and application.The construction process of the membrane electrode is as follows: carbon-based metal catalyst or the mixture of carbon-based metal catalyst and silicon dioxide carbon tube is dispersed in water, then organic solvent and binder solution are added in turn, to obtain catalyst ink;The catalyst ink is sprayed on carbon paper, and heat treatment is carried out in a protective atmosphere to obtain a gas diffusion electrode.If the aforementioned does not add silicon dioxide carbon tube, silicon dioxide carbon tube-organic solvent solution needs to be sprayed on the surface of the catalyst layer.The electrode is modified by silicon dioxide carbon tube, which on the one hand constructs a long-range ordered proton transport channel of membrane-catalyst-silicon dioxide carbon tube, and on the other hand adjusts the PA distribution in the membrane electrode assembly, suppresses PA loss, and improves the overall performance of the electrode.When applied to proton exchange membrane fuel cells, it can effectively solve the problems of poor stability, low activity and catalyst deactivation under high temperature conditions.

Single channel liquid membrane cell assemblies and cell bodies are disclosed. In some embodiments, the single channel liquid membrane cell assembly includes an elongate cell body having an elongate opening, a first bipolar plate adjacent the cell body, and a first gas diffusion electrode disposed between the cell body and the first bipolar plate. The first gas diffusion electrode spans across the entire length and width of the elongate opening of the cell body. The single channel liquid membrane cell assembly additionally includes a second bipolar plate adjacent the cell body such that the cell body is disposed between the first and second bipolar plates. The elongate opening horizontally defines an open area and the first gas diffusion electrode and the second bipolar plate vertically define the open area therebetween.

The present invention provides a platinum-nickel catalyst gas diffusion electrode, its preparation method and application, belonging to the technical field of electrode materials. First, a conductive material and a polymer are dispersed in ethanol to obtain a dispersion liquid, and then the dispersion liquid is coated on a Ni mesh and subjected to calcination treatment to obtain a gas diffusion layer electrode. Then, the gas diffusion layer electrode is placed in an electrolyte for electrodeposition, and then calcination treatment is carried out to obtain the platinum-nickel catalyst gas diffusion electrode. The platinum-nickel catalyst gas diffusion electrode prepared by the present invention effectively solves the problem of slow kinetics of the 2e- electrochemical oxygen reduction reaction under neutral conditions, reduces the usage amount of noble metals, increases the production of hydrogen peroxide, shows high catalytic activity and stability, and can also remove harmful substances such as malachite green in water bodies.

The application discloses a needle coke-based gas diffusion cathode and a preparation method thereof, and the preparation method comprises the following steps: step one, taking high-conductivity needle coke powder, and performing alkali modification treatment on the needle coke powder to obtain modified needle coke; performing iron salt impregnation calcination treatment on the alkali modified needle coke to obtain iron-loaded needle coke; step two, mixing the modified needle coke and the iron-loaded needle coke with anhydrous ethanol and polytetrafluoroethylene respectively, and pressing the mixture into a gas diffusion layer and an iron-loaded needle coke catalytic layer, and then pressing the gas diffusion layer and the iron-loaded needle coke catalytic layer on both sides of a titanium mesh by using a hydraulic press to obtain a needle coke-based gas diffusion electro-Fenton cathode precursor; and step three, calcining the electrode precursor in a muffle furnace to improve the stability of the electrode precursor, and obtaining a needle coke-based gas diffusion electro-Fenton cathode. The gas diffusion electrode prepared by combining the high-conductivity and stable needle coke and PTFE can form a three-phase system on the surface of the electrode, so that the oxygen can be better contacted with the surface of the electrode, the generation efficiency of H2O2 is improved, and then the treatment effect of the electro-Fenton system on the organic matter is improved.

The invention relates to the technical field of catalysts, and provides a Ce-doped graphene NiFe-LDH bifunctional catalyst as well as a preparation method and application thereof. The preparation method of the bifunctional catalyst comprises the following steps: performing hydrothermal reaction on graphene oxide, a nickel source, an iron source and a cerium source in an aqueous solution containing a protective agent and a precipitator at 100-120 DEG C to obtain the Ce-doped graphene NiFe LDH bifunctional catalyst. According to the invention, NiFi-LDH is used as a framework, synergistic doping of Ce and transition metals (Ni, Fe) on graphene-loaded layered double hydroxides (LDH) is realized, and the graphene-loaded layered double hydroxides have substantially high porosity and can be printed on a gas diffusion electrode as a bifunctional catalyst layer to improve the electrochemical reaction efficiency. The preparation method provided by the invention has the characteristics of mild synthesis conditions, easily available raw materials, simple process and strong expandability, and is easy to realize industrial application. The catalyst provided by the invention has excellent OER and HER performances, and the activity and stability of the NiFe-LDH catalyst in alkaline water electrolysis are effectively improved.

The invention discloses a copper cyanoaurate hexagonal sheet loaded cuprous oxide material as well as a preparation method and application thereof. The copper cyanoaurate hexagonal sheet loaded cuprous oxide material comprises a copper cyanoaurate hexagonal sheet and cuprous oxide loaded on the copper cyanoaurate hexagonal sheet. According to the preparation method, copper ammonium chloride and potassium cyanoaurate are taken as raw materials, a copper cyanoaurate hexagonal sheet is prepared by a hydrothermal method, and then cuprous oxide is loaded on the copper cyanoaurate hexagonal sheet, so that the copper cyanoaurate hexagonal sheet loaded cuprous oxide material is obtained. The invention provides application of the copper cyanoaurate hexagonal sheet loaded cuprous oxide material as a catalyst for electrocatalytic reduction of carbon dioxide, and provides a gas diffusion electrode, and the catalyst in the gas diffusion electrode is the copper cyanoaurate hexagonal sheet loaded cuprous oxide material. The preparation process is simple and environment-friendly; the prepared material has higher ethylene selectivity and stability in the reaction of electrocatalytic reduction of carbon dioxide.

The present invention addresses the problem of providing a conductive porous base material having high water repellency without containing fluorine.　The present invention is a conductive porous base material containing carbon fibers, wherein a resin containing nanocarbon aggregates is supported on the carbon fibers, the sliding angle is 2° to 60° inclusive, and the mass ratio F / C of the fluorine content to the carbon content is 0.01 or less.

The invention provides a gas diffusion electrode device for electrochemical lithium-mediated ammonia synthesis and an electrochemical ammonia synthesis method, and belongs to the technical field of electrochemical ammonia synthesis. The gas diffusion electrode device comprises a nitrogen runner, a sealing gasket, a working electrode, a catholyte chamber, a diaphragm, an anolyte chamber, an anode catalyst, a hydrogen runner and an electrolyte, the electrolyte comprises a lithium salt, an organic solvent, a proton shuttling agent and an interface additive. According to the invention, high nitrogen transmission is realized by adopting a circulating type gas diffusion electrode device, and a three-phase interface chemical environment of gas, electrolyte and the gas diffusion electrode is regulated and controlled by an interface additive, so that the ammonia production rate and the Faraday efficiency are remarkably improved, and continuous and efficient nitrogen reduction reaction is realized at normal temperature and normal pressure.

A gas diffusion electrode medium for a fuel cell, which has high water repellent performance and excellent anti-flooding performance, can exhibit high power generation performance, and has high productivity is provided. A long gas diffusion electrode medium is composed of a conductive porous medium having a microporous layer containing a carbonaceous powder and a water repellent substance on one surface of the conductive porous medium, in which 65% or more of linear cracks observed in the microporous layer from the top surface are inclined at 45° to 90° from a width direction of the gas diffusion electrode medium.

The Present invention relates to a gas diffusion electrode (GDE), preferably oxygen-depolarized cathode (ODC), comprising an inert conductive substrate and a catalytic coating, wherein the catalytic coating comprises ruthenium-rhodium sulphides, wherein rhodium sulphide content is comprised between 30% and 70% by weight referred to metals with respect to the total weight of said ruthenium-rhodium sulphides, wherein ruthenium sulphide content is comprised between 30% and 70% by weight referred to metals with respect to the total weight of said ruthenium-rhodium sulphides. The present invention also relates to the use of the aforementioned oxygen-depolarized cathode (ODC) in a hydrochloric acid electrolysis cell (HCl-ODC).

A gas diffusion electrode according to one embodiment of the present invention has a microporous layer, containing carbonaceous fine particles and a fluorine-based water-repellent resin, on at least one surface of a conductive porous substrate. In the gas diffusion electrode, the ratio (surface layer F / C) of elemental fluorine to elemental carbon detected, at 1,000 times magnification and an acceleration voltage of 2.0 kV by scanning electron microscope energy dispersive X-ray spectroscopy (SEM-EDX), on the surface on the side of the microporous layer with which the conductive porous substrate is not in contact is 0.35 or more and 0.60 or less.

Provided is an electrode catalyst having excellent catalyst activity, which contributes to the low cost of a PEFC. The electrode catalyst includes a hollow carbon carrier having nanopores with a pore diameter of 1 to 20 nm, and a plurality of catalyst particles supported on the carrier. The catalyst particles contain Pt (0 valence), are supported inside and outside the nanopores of the carrier, and in a case where analysis of the particle size distribution of the catalyst particles is performed using a three-dimensional reconstruction image obtained by electron tomography using STEM, the proportion of the catalyst particles supported inside the nanopores is 50% or more, and at least one nanopore having the shape of a continuous communication hole is formed in a cubic image having one side of 20 to 50 nm obtained from the three-dimensional reconstruction image of the catalyst block.

The application relates to a preparation method and application of a citron-shaped CuO / Cu-MOF electrocatalyst. The application aims to solve the problem of the existing C2H4 selectivity limitation of CuO. The method comprises the following steps: 1, preparing a precursor solution; 2, hydrothermal reaction; 3, calcination; and 4, in-situ conversion. Application: the citron-shaped CuO / Cu-MOF electrocatalyst is used as a raw material to prepare a gas diffusion electrode, and is used for electrocatalytic CO2 reduction. The application is used for the preparation and application of the citron-shaped CuO / Cu-MOF electrocatalyst.

The disclosure relates to a catalyst suitable for electrochemical reduction reactions of one or more carbon oxides, comprising a nitride-doped multi-metallic material comprising a primary metal being copper and one or more secondary metals selected from silver, gold, platinum, palladium, ruthenium, iridium, osmium, and any mixture thereof, wherein the nitride-doped multi-metallic material comprises, as determined by XRD, copper, copper nitride and copper-Me alloy wherein Me is one of the secondary metals and to a gas diffusion electrode suitable for electrolysis of one or more carbon oxides comprising such a catalyst.

Provided are an ammonium nitrate manufacturing apparatus, which is an apparatus for manufacturing ammonium nitrate from a diluted nitrogen oxide, including: a cathode; an anode which is arranged to be opposite to and spaced apart from the cathode; and an electrolyte placed between the anode and cathode, wherein the cathode and the anode are independently of each other gas diffusion electrodes including: a porous substrate; metal organic frameworks (MOFs) dispersed in the porous substrate; and a metal catalyst placed on one surface of the porous substrate, and a method for manufacturing ammonium nitrate using the same.

The invention discloses a preparation method of a high-temperature proton exchange membrane fuel cell membrane electrode based on zeolite doping regulation, which comprises the following steps: activating zeolite through high-temperature roasting and phosphoric acid treatment, mixing the activated zeolite with a catalyst, a binder and the like to prepare catalyst slurry, and spraying the slurry on a gas diffusion electrode by using an ultrasonic spraying technology; and after heat treatment, assembling the electrode, the high-temperature proton exchange membrane and the polyimide film in sequence, and carrying out hot press molding to finally obtain the optimized membrane electrode of the high-temperature proton exchange membrane fuel cell. The invention provides the membrane electrode assembly with high activity and excellent durability, the introduction of zeolite significantly improves the activity, and in a durability test as long as 500 h, after 8 times of start-stop cycles, the battery voltage is almost not attenuated, and good stability is shown.

The present invention relates to a gas diffusion electrode, a use thereof, and a method for manufacturing the electrode.

The invention relates to the technical field of electrolysis electrodes, in particular to a gas diffusion layer and a preparation method and application thereof. The gas diffusion layer comprises a latticed current collector and a porous gas-permeable layer embedded in the latticed current collector, and the porous gas-permeable layer is composed of a hydrophobic polymer. According to the gas diffusion layer, a latticed current collector is adopted as a conductive framework, a three-dimensional continuous electron transmission channel is formed, the electron conduction efficiency is improved, and meanwhile energy consumption and heating caused by ohmic impedance are reduced; meanwhile, the hydrophobic polymer porous layer is embedded into grid pores of the current collector, a reinforcing steel bar-concrete type composite structure with a porous structure is constructed, and the porous structure can serve as a gas channel and is beneficial to gas diffusion; moreover, based on the hydrophobic effect of the hydrophobic polymer, the liquid gathered in the catalyst layer can be quickly led out, and the problem of water flooding of the gas diffusion electrode can be effectively avoided under the condition that the reaction system has more liquid.