384 results about "Gas diffusion electrode" patented technology

Improved performance ion exchange membranes for use in REM, AEM and DMFC fuel cells, buffered fuel cells, hydrolysis, other applications comprise a molecular matrix of homopolymers, di-monomer, heteropolymers, copolymers, or block-polymers of fluorocarbon and hydrocarbon compounds combined with (i) skeletal support grid to improve durability, handling, reduce membrane swelling, and sequester dopants and nanoparticles from leakage; (ii) microporous membrane formed using a sacrificial filler process enhancing conductivity and limiting fuel crossover; (iii) hetero-ionomeric matrix of two-or-more membrane-bound acids e.g. sulphonic and phosphonic acid expanding usable range; (iv) permanent fillers enhancing conductivity and porosity including nanoparticles, metal-oxides, zeolites, silicates, GOs, CNTs, MOFs, POSS, and others; (v) ionic liquid doping to enhance membrane conductivity; (vi) membrane nanocoating preventing H2O2 diffusion; and / or (vii) catalytic nanocoating with metals, metal-oxides, and MOFs preventing atmospheric toxin catalyst poisoning. Combined with a heterogenous GDI, the IEM is integrated into iBFC power blade and energy bank applications.

The invention belongs to the technical field of electrochemistry, and particularly relates to a gas diffusion electrode for efficiently producing hydrogen peroxide in situ and a preparation method thereof. The gas diffusion electrode is composed of a carbon paper substrate, a carbon black gas diffusion layer and a carbon nitride modified carbon nanotube catalyst layer. The preparation method of the gas diffusion cathode comprises the following steps: mixing a carbon nanotube, g-C3N4, isopropanol, 60wt% of PTFE emulsion and water to prepare a mixed solution, and loading a compound of the carbon nanotube and g-C3N4 on one side of a carbon paper substrate by adopting an ultrasonic impregnation mode to prepare a catalyst layer; the other side of the carbon paper substrate is impregnated with carbon black and PTFE emulsion to prepare a diffusion layer, and the diffusion layer is uniformly coated, dried and annealed to prepare the gas diffusion cathode. The gas diffusion electrode is used for efficiently producing hydrogen peroxide through in-situ electrocatalysis, the yield of hydrogen peroxide can reach 1050 mg / L after 1.5 h, the current efficiency is 76%, and the energy consumption is 5.56 KWh / Kg.

The invention relates to a preparation method and application of a sandwich-structured gas diffusion electrode, and belongs to the fields of electrochemical catalysis, carbon dioxide utilization and renewable energy sources. According to the preparation method, a catalyst layer, a cation layer and a protective layer are prepared on a gas diffusion substrate in a layered manner; the catalytic layer, the cation layer and the protective layer respectively play roles in catalyzing CO2 reduction, adjusting the microenvironment, preventing cation leakage and the like. When applied, the sandwich-structured gas diffusion electrode GDE prepared by the method can be assembled on electrochemical carbon dioxide reduction modules such as a flow battery and a membrane electrode assembly (MEA) to carry out electrochemical reduction reaction of CO2, has high activity and high stability, and can avoid adding inorganic alkali metal cations into catholyte to inhibit hydrogen evolution side reaction. Based on the invention, GDE can be prepared through a microenvironment engineering means, and the performance of the electrochemical reduction reaction of carbon dioxide is improved.

The invention discloses a multistage sewage treatment device and method combining biological treatment and electro-Fenton, and relates to the field of water pollution control, the device is composed of a three-chamber microbial fuel cell reactor, and the three-chamber microbial fuel cell reactor is sequentially composed of a microbial anode chamber, an electro-Fenton cathode chamber and a photosynthesis chamber from left to right. The biological anode chamber consists of filled anaerobic granular sludge and a carbon brush electrode serving as an electron collector; and the core structure of the electro-Fenton cathode chamber is a gas diffusion cathode loaded with nano FeCo2O4. The microbial anode chamber and the electro-Fenton cathode chamber are isolated by a proton exchange membrane, and the gas diffusion electrode separates the electro-Fenton cathode chamber and the photosynthesis chamber at the same time. According to the invention, the combination of two clean energy sources, namely microbial energy and light energy, is realized, the efficient removal capability of aerobic and anaerobic biological treatment technologies and the synergistic mechanism of microorganisms and algae for purifying sewage are combined, the efficiency of the microbial fuel cell is further optimized, and the removal of ammonia nitrogen and refractory organic pollutants in the sewage is realized.

The invention relates to an electrochemical carbon dioxide reduction device without a prefabricated anion exchange membrane and application of the electrochemical carbon dioxide reduction device, and belongs to the fields of electrochemistry, carbon dioxide utilization and renewable energy sources. The device comprises an anode for catalyzing an oxygen evolution reaction, a cathode formed by a gas diffusion electrode, an extraction chamber arranged between the anode and the cathode, a cation exchange membrane covering the surface of the anode, a diaphragm covering the surface of the cathode, and ion exchange resin filled in the extraction chamber and used as a solid electrolyte. The device is used for a carbon dioxide reduction reaction, and an extracting solution can be used in an extracting chamber to extract a liquid product solution of carbon dioxide reduction; the components of the liquid product solution only contain the components of the extracting solution and the components of the liquid product. Based on the invention, the use of expensive prefabricated anion exchange membranes with unstable acidic conditions can be avoided, a product with higher purity of a liquid product can be directly obtained, and an additional operation unit for separating the liquid product from metal cations can be omitted.

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 a preparation method and application of a CuO / MgO nano-catalyst, and relates to a preparation method and application of a nano-catalyst. The invention aims to solve the problem that in the existing electrocatalytic CO2 reduction technology, under high current density, an oxide catalyst is easy to generate various reduction products, and high C2H4 selectivity is difficult to achieve. The method comprises the following steps: 1, preparing a precursor solution; 2, hydrothermal reaction; and 3, roasting. According to the application, the CuO / MgO nano-catalyst is used as a raw material for preparing a gas diffusion electrode and is used for electrocatalytic CO2 reduction. The preparation method is used for preparation and application of the CuO / MgO nano-catalyst.

The invention discloses a preparation method of a circulation type gas diffusion electrode for electrochemical CO2 reduction, and belongs to the technical field of electrochemical CO2 reduction. The circulation type gas diffusion electrode directly conveys carbon dioxide to the surface of a cathode in the electrochemical CO2 reduction process; the specific preparation method comprises the following steps: adding N-methyl-2-pyrrolidone into polyethyleneimine, and carrying out ultrasonic treatment; the preparation method comprises the following steps: adding copper powder into a transparent and uniform mixed solution of N-methyl-2-pyrrolidone and polyethyleneimine, and carrying out magnetic stirring; and calcining the uniform mixture of N-methyl-2-pyrrolidone, polyethyleneimine and copper powder and the hollow fiber of polyethyleneimine and copper powder in a smelting furnace to obtain the FTGDE electrode. By adopting the preparation method of the circulation type gas diffusion electrode for electrochemical CO2 reduction, disclosed by the invention, efficient transmission and utilization of carbon dioxide are ensured, and the electrochemical reduction reaction efficiency is improved.

The invention provides an integrated gas diffusion electrode based on additive manufacturing, a preparation method of the integrated gas diffusion electrode and an integrated PEM electrolysis water membrane electrode, and relates to the field of membrane electrodes. The integrated gas diffusion electrode comprises a bipolar plate, a diffusion layer, a metal catalyst layer and an alloy catalyst layer which are integrally formed, and a gas flow channel for gas circulation is formed in the bipolar plate. The preparation method comprises the following steps: carrying out additive manufacturing on the bipolar plate by using continuous laser and forming a gas flow channel; carrying out additive manufacturing on the diffusion layer by using continuous laser; carrying out additive manufacturing on the metal catalyst layer by using ultrafast laser; and carrying out additive manufacturing on the alloy catalyst layer by using an ultrafast laser and aerosol injection process. The integrated PEM electrolyzed water membrane electrode is made of a proton exchange membrane and an integrated gas diffusion electrode. According to the invention, high performance of the membrane electrode can be ensured, the number of components and the volume and weight of the membrane electrode can be reduced by using an additive manufacturing technology, and configuration is simplified.

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 purpose of the present invention is to provide a gas diffusion electrode which reduces electrical resistance in a thickness direction without impairing gas diffusibility, and improves power generation performance when used in a fuel cell. The present invention relates to a gas diffusion electrode having a microporous layer on at least one surface of a conductive porous substrate. The gas diffusion electrode is characterized in that the microporous layer includes carbon black and graphite particles with an aspect ratio of 10 or more, and the ratio of the thickness of a portion in which the microporous layer is sunk of the conductive porous substrate to the thickness of a portion in which the microporous layer is not sunk of the conductive porous substrate is 5-20% inclusive.

The invention discloses a method for synthesizing p-aminophenol through electrolytic reduction, which comprises the following steps: carrying out electrolysis by adopting a diaphragm electrolytic cell and taking an oxidation reaction of hydrogen as an anode reaction, taking a reduction reaction of nitrobenzene as a cathode reaction, taking a sulfuric acid aqueous solution as an anode liquid and taking an aqueous solution containing nitrobenzene and sulfuric acid as a cathode liquid, and recycling an electrolysis product in the cathode liquor to obtain the p-aminophenol. According to the invention, the oxidation reaction of hydrogen is used as the anode reaction, a membrane electrode or a gas diffusion electrode is preferably used as the anode, and an iridium oxide anode and a lead anode are not used, so that the cost is effectively reduced or pollution is avoided; the electrolytic reaction is carried out under the condition that the pressure intensity of the anode chamber is not lower than that of the cathode chamber, the electrolytic voltage is reduced by about 1.6-2.3 V (compared with an iridium oxide anode), the energy consumption is obviously reduced, and the yield of p-aminophenol is improved by about 10%.

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 discloses an efficient CO2 electroreduction method and device for anode and cathode acid electrolyte connected in series, and the method comprises the following steps: pumping an acid electrolyte into an anode chamber, and enabling the acid electrolyte to react on the surface of an anode electrode to obtain an acid electrolyte containing dissolved oxygen; an acidic electrolyte containing dissolved oxygen is introduced into the cathode chamber, and the dissolved oxygen generates an OOH * intermediate at the cathode electrode; cO2 is introduced into the surface of the catalyst layer of the cathode gas diffusion electrode, the OOH * intermediate can reduce the energy barrier of CO2 molecule activation, and a stable * COOH intermediate and a stable * OCHO intermediate are obtained; and a * OCHO intermediate, the * OCHO intermediate continuing to be electrically reduced to form a product. The acidic electrolyte is introduced from the anode side, the coupling anode OER is driven by the acidic electrolyte from the anode side to the cathode side, the proton concentration on the two sides is effectively balanced, and continuous and stable operation of CO2 electroreduction is facilitated; the dissolved oxygen generated by the anode OER can participate in CO2 electroreduction, and the dissolved oxygen in the electrolyte is beneficial to adjusting the oxidation state of the catalyst in the CO2 electroreduction process, so that an efficient catalytic environment is maintained; meanwhile, the OOH * intermediate can reduce the energy barrier of CO2 molecule activation and stabilize the intermediate of the ECO2R product, so that the conversion efficiency of CO2 electroreduction is improved, and the efficient ECO2R process is realized.

The invention relates to an electroreduction method for synthesizing acetamide by coupling carbon dioxide and nitrate through electrocatalysis. The electroreduction method specifically comprises the steps that cobalt salt, copper salt, a nitrogen source and carbon source carbon black are mixed, heated and calcined, and a carbon nitride loaded copper-cobalt diatomic catalyst is prepared; loading the obtained carbon nitride loaded copper-cobalt diatomic catalyst on the surface of carbon paper to prepare a gas diffusion electrode of a three-chamber flow cell electrolytic tank; the obtained gas diffusion electrode is applied to a three-chamber flow cell electrolytic tank to prepare acetamide through electroreduction. The copper-cobalt double-atom catalyst is used for synthesizing acetamide through electrochemical coupling of carbon dioxide and nitrate, the acetamide Faraday efficiency in a flow cell can reach 18% or above, and the yield is 81.2 mg L <-1 >. H <-1 >. Compared with the prior art, the prepared copper-cobalt diatomic catalyst has high selectivity for generation of acetamide through co-reduction coupling of carbon dioxide and nitrate radicals, and synchronous treatment of greenhouse gas carbon dioxide and nitrate wastewater and value-increasing utilization of carbon and nitrogen resources can be achieved.

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.

The present invention concerns a gas diffusion electrode for the electrochemical reduction of carbon dioxide comprising an electrically conductive porous gas diffusion layer; at least one porous catalyst layer arranged adjacent to said gas diffusion layer, said at least one porous catalyst layer comprising a first porous catalyst layer comprising a copper-based first catalyst material, wherein said first porous catalyst layer comprises a mixture of said copper-based first catalyst material and a hydrophobic material, said porous catalyst layer being obtained from a precursor material which does not contain any ionomer; and an ionomer layer arranged adjacent to said at least one porous catalyst layer, said ionomer layer being obtained from a precursor material which does not contain any catalyst. The invention also concerns an electrochemical cell comprising such a gas diffusion electrode and a method for manufacturing such a gas diffusion electrode.

The invention provides a gas diffusion electrode section in-situ Raman test system. The gas diffusion electrode section in-situ Raman test system comprises a Raman spectrometer and an electrochemical reaction tank, the Raman spectrometer comprises a Raman lens; the electrochemical reaction tank comprises a gas flow field plate, a cathode flow field plate, an anode flow field plate, a liquid leakage prevention plate, a first light window, a second light window, a window sheet, a sealing gasket, a sealing plate, a first fastener, a second fastener, a gas diffusion electrode, an anode, a reference electrode and an ion exchange membrane. The test system provided by the invention can realize high-spatial-resolution in-situ Raman test of the section of the gas diffusion electrode, especially the section of the catalyst layer of the gas diffusion electrode.

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.

The present invention discloses an automated flow electrolytic cell for carbon dioxide electroreduction, comprising a testing mechanism, a first moving mechanism, a pushing mechanism, a second moving mechanism and a control system; the testing mechanism comprises an electrolyte flow path system and a gas flow path chamber, the pushing mechanism comprises a supporting splint, a plurality of holes are arranged on the supporting splint, and the holes are used to place gas diffusion electrodes loaded with catalysts; the control system is used to control the movement of the first moving mechanism and the second moving mechanism so that gas diffusion electrodes with different holes are assembled between the electrolyte flow path system and the gas flow path chamber and sealed to form an electrolytic cell, and work in coordination with a preparation system, a detection system, etc., for automatic screening of catalysts for carbon dioxide electroreduction. The present invention solves the problem of manually installing and disassembling the reaction cell and replacing the electrode through the combined application of the pushing mechanism and the testing mechanism, thereby improving the test efficiency and reproducibility.

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 discloses a method for an electrocatalytic production of formic acid in a single-chamber electrolysis system, belonging to the field of electrocatalysis. The cathode electrode and the anode electrode of the present invention are arranged in the single-chamber electrolysis system. The anode electrode is a self-supporting electrode loaded with a nickel-based layered double hydroxide catalyst, and the cathode electrode is a gas diffusion electrode sprayed with a copper-based, bismuth-based, tin-based or indium-based metal or alloy catalyst. In the examples provided by the present invention, a nickel foam electrode with electrochemically activated surface-grown NiV layered double hydroxide is used as the anode electrode for catalyzing the oxidation of glycerol to produce formic acid, and conductive carbon black loaded with Bi nanoparticles is sprayed onto the gas diffusion electrode as the cathode electrode for catalyzing the electrochemical reduction of CO2 to produce formic acid. The present invention realizes the simultaneous production of formic acid at the cathode and the anode in the single-chamber electrolysis system, greatly improves the energy efficiency of formic acid production, reduces the cost of the electrochemical reactor, and improves the stability of the reaction device. The scaled-up single-chamber electrolysis system provides a new idea for the industrial-scale production of formic acid.

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.

The invention belongs to the technical field of fuel cell materials, and particularly relates to a fuel cell membrane electrode, a preparation method and application. The fuel cell membrane electrode comprises a gas diffusion electrode and a self-supporting active component attached to the surface of the electrode, the gas diffusion electrode is foamed nickel, and the self-supporting active component is NiFeZnCoPt high-entropy metal alloy; and the atom ratio of a single metal element in the high-entropy metal alloy is 5-30%. The preparation method comprises the following steps that S1, foamed nickel is put into a hydrochloric acid solution to be soaked, deionized water and ethyl alcohol are sequentially used for ultrasonic cleaning, and the cleaned foamed nickel is put into a drying oven to be dried for use; s2, NiCl2. 6H2O, FeCl3. 6H2O, ZnCl2, CoCl2. 6H2O and PtCl2 are dissolved in deionized water, ammonium fluoride and urea are sequentially added, and a mixed solution is obtained after magnetic stirring is conducted; and S3, putting the cleaned foamed nickel into the mixed solution, putting the mixed solution into a high-pressure reaction kettle for reaction, cooling to room temperature after the reaction is finished, and centrifuging, cleaning and drying to obtain the fuel cell membrane electrode.