3244 results about "Membrane electrode assembly" patented technology

The present application provides a battery cell, a battery, and an electrical device, belonging to the field of battery technology. The battery cell includes a positive electrode sheet and an electrolyte solution. A coating mass of a positive electrode active material layer on a single side of the positive electrode sheet is 410 mg / 1540.25 mm2 to 550 mg / 1540.25 mm2, and a membrane resistance of the positive electrode sheet is ≥1Ω. A conductivity of the electrolyte solution is ≤14 mS / cm. The battery cell has thick coated electrode sheets, where the lower membrane resistance of the positive electrode sheet indicates its higher conductivity, which is conducive to reducing solid-state ohmic resistance of the battery cell. The higher conductivity of the electrolyte solution is conducive to reducing liquid-phase ohmic impedance of the battery and alleviating concentration polarization to some extent.

The invention provides a self-iteration membrane electrode assembly defect detection method, device and equipment. The method provided by the invention comprises the following steps: taking a pre-trained initial defect detection model as a current detection model, and performing defect positioning and defect type identification on a surface image of a to-be-detected membrane electrode assembly by utilizing the current detection model to obtain a detection result of the to-be-detected membrane electrode assembly; determining the detection precision of the current detection model according to the plurality of detection results; when the detection precision is smaller than a preset precision value, defect position labeling and defect type labeling are carried out on the stored surface images of the membrane electrode assembly to be detected, and the plurality of labeled surface images are determined as iterative training samples; and combining the iterative training sample and an initial training sample used for training the initial defect detection model, training the current detection model to obtain an iterative defect detection model, and carrying out defect detection. The self-iteration membrane electrode assembly defect detection method provided by the invention is used for improving the detection precision of defect detection.

The invention relates to the technical field of electrolytic hydrogen production, and discloses a PEM electrolytic cell energy-economy collaborative optimization method based on digital twinning, which comprises the following steps: S1, calibrating parameters of a membrane electrode mathematical model by using a standard test for a single cell of a PEM electrolytic cell, and establishing a high-precision physical simulation model; s2, constructing a high-precision digital twin system based on the high-precision physical simulation model; s3, inputting multi-dimensional data of electricity price fluctuation, hydrogen demand prediction and equipment state, and performing collaborative optimization analysis through an optimization decision algorithm; s4, forming a PEM electrolytic cell control optimization instruction; and S5, the physical entity PEM electrolytic bath executes the instruction. According to the method, the'electricity price-demand-equipment 'dynamic relation is planned as a whole from the global perspective, the process steps cover data-driven modeling, multi-target decision, digital twinning cooperation and closed-loop feedback, balance needs to be achieved among algorithm efficiency, model precision and engineering feasibility, and energy-economy-life multi-target cooperation is achieved.

The invention relates to an anion exchange membrane based on isopropyl piperidone and biphenyl and a preparation method of a membrane electrode, the preparation method comprises the following steps: respectively dissolving an aromatic monomer and IPD in a first solvent, and mixing to obtain a mixed solution, the aromatic monomer being BP or TP; dropwise adding an acidic initiator into the mixed solution for reaction at the reaction temperature of-5 DEG C to 0 DEG C to obtain a nitrogen heterocyclic ring polymer intermediate; adding a quaternization reagent into the nitrogen-containing heterocyclic ring polymer intermediate to realize quaternization modification of nitrogen atoms to obtain a quaternization ionomer; and forming a film to obtain the AEM film. The preparation method of the membrane electrode comprises the following steps: respectively forming a cathode catalyst layer and an anode catalyst layer on two opposite sides of an AEM membrane through ultrasonic spraying to obtain the MEA. The AEM membrane and the MEA obtained according to the invention have the characteristics of excellent stability and high water electrolysis performance, can significantly improve the efficiency and durability of AEMWE, and are suitable for the fields of hydrogen production by water electrolysis and the like.

The invention discloses a method for preparing a platinum-based alloy catalyst by using a plasma enhanced chemical vapor deposition low-temperature technology, relates to a preparation method of a platinum-based alloy catalyst, and aims to solve the technical problems that a carbon layer is not uniformly coated and metal particles of the catalyst are easy to agglomerate in a high-temperature calcination process in the existing platinum-based alloy catalyst prepared by carbon coating. The method comprises the following steps: 1, preparing Pt / C by a polyhydric alcohol reduction method; 2, pre-treating a Pt / C catalyst; 3, preparing M-Pt / C by a dipping evaporation method; 4, PECVD carbon shell coating is carried out; (5) alloying; and 6, removing a part of carbon shell to obtain the platinum-based alloy catalyst. When the Pt / C catalyst is used for preparing a membrane electrode of a proton exchange membrane fuel cell, the peak power density can reach 1.72-1.89 W / cm < 2 > under a hydrogen-air condition, which is improved by 20.3% and 32.2% compared with a membrane electrode of a commercial 20% Pt / C catalyst, and the Pt / C catalyst can be used in the field of proton exchange membrane fuel cells.

The invention relates to a titanium oxide nanowire supported iridium catalyst as well as a preparation method and application thereof. The catalyst comprises a titanium oxide nanowire carrier and elemental iridium supported on the titanium oxide nanowire carrier. According to the catalyst, the titanium oxide nanowire is used as a carrier, and the catalyst prepared by loading elemental iridium on the titanium oxide nanowire is used as an anode catalyst, so that higher mass specific activity and lower oxygen evolution overpotential can be obtained; the membrane electrode prepared by using the composite material has the characteristics of low noble metal catalyst loading capacity and low electrolytic water decomposition voltage.

The invention relates to an electrode and a membrane electrode assembly for a zero-gap electrolyzer, a zero-gap electrolyzer, the use of a metal phthalocyanine, and a method for producing an electrode. An electrode (1, 1a, 1b) for a zero-gap electrolyzer (11) comprises a metal phthalocyanine (4). In this way, a particularly effective and cost-efficient catalyst can be provided.

The invention provides a membrane electrode, a preparation method thereof and a monocell, the membrane electrode comprises a double-cathode catalyst layer, a proton exchange membrane and a gas diffusion layer, the double-cathode catalyst layer comprises a first catalyst layer and a second catalyst layer; the first catalyst layer is connected with the proton exchange membrane, and the second catalyst layer is connected with the gas diffusion layer; the raw materials of the double-cathode catalyst layer comprise a platinum-containing catalyst and an ionomer; the particle size D50 of platinum in the first catalyst layer is smaller than the particle size D50 of platinum in the second catalyst layer. The double-cathode catalyst layer is arranged, and the particle size D50 of platinum in the first catalyst layer is smaller than the particle size D50 of platinum in the second catalyst layer, so that the utilization rate of the material is improved to the maximum extent, the cost is reduced, the performance and the overall durability of the membrane electrode are improved, and the membrane electrode has good development potential.

The invention belongs to the technical field of conductive connection, and particularly relates to an assembling mechanism for keeping combined pole pieces clamped, in particular to a pole piece assembling mechanism, an electric pile material pre-assembling device and a working method of the electric pile material pre-assembling device. Wherein the pole piece assembling mechanism is provided with an assembling plate; a rotating arm; a first lifting assembly; a second lifting assembly; the pressing frame is provided with a square opening matched with the pressing plate. And elastic anti-clamping pieces are embedded in the side walls of the pressing plates. The elastic anti-clamping piece is arranged on the side wall of the pressing plate, so that when the pressing frame is separated from the pressing plate, the elastic anti-clamping piece can automatically and dynamically adjust the levelness of the pole piece frame falling into the pressing plate, and the problem that the pole piece frame is inclined and clamped is effectively avoided; when the pressing frame and the pressing plate are pressed in a matched mode, the elastic anti-clamping piece is pressed to retract, accurate assembly of the pole piece frame and the membrane electrode is guaranteed, pole piece damage caused by rigid contact is prevented through the elastic buffering effect, and therefore the assembly yield of the galvanic pile pole piece is remarkably increased.

The invention discloses a preparation method of a gas-liquid fluctuation resistant backflow electrolyzed water microchannel, and relates to the technical field of preparation of hydrogen by electrolyzed water, the preparation method comprises the following steps: S1, selecting a polar plate of an unprocessed flow channel, and designing and processing a Tesla valve array structure comprising a Tesla island; s2, selecting a processed polar plate, and processing a micro-column array at a position close to the side wall of the Tesla structure channel; s3, respectively coating the anode side and the cathode side of the proton exchange membrane with iridium oxide and platinum carbon to prepare a catalyst layer of the membrane electrode; s4, preparing a diffusion layer, and hot-pressing the proton exchange membrane loaded with the catalyst layer and the diffusion layer together to form a membrane electrode with catalytic activity; and S5, assembling the polar plate and the membrane electrode to form the proton exchange membrane water electrolysis device with the Tesla structure and the local wettability channel. According to the invention, the phenomenon of gas-liquid backflow of the electrolytic water flow channel under large current can be effectively inhibited, and the loss of active sites caused by blockage of the flow channel by the backflow electrolytic gas is avoided.

The invention belongs to the technical field of fuel cells, and particularly relates to a preparation method of a dry-method membrane electrode and the prepared dry-method membrane electrode. The preparation method of the dry-method membrane electrode comprises the following steps: firstly, dispersing carbon carrier powder in water, and then adding a perfluorosulfonic acid resin solution to disperse again; drying the obtained dispersion system, adding platinum black powder, and grinding to obtain a powder mixture; and finally, electrostatically spraying the powder mixture on two sides of the proton exchange membrane, and carrying out hot rolling to obtain the proton exchange membrane. According to the manufacturing method of the dry-process membrane electrode, the swelling deformation of the membrane when the membrane encounters a solvent is effectively avoided; and agglomeration caused by hydrophilicity and high autohension of the perfluorosulfonic acid resin powder is effectively avoided, coating of the perfluorosulfonic acid resin on the catalyst is improved, proton conduction is effectively improved, and anode transmission resistance is reduced.

The invention discloses a fuel cell test system and method. The fuel cell test system comprises a test stack and a test analysis device, the test analysis device is connected with the test stack to detect the performance of the test stack, and the test stack comprises two end plates and more than two test single cells arranged between the two end plates. The pseudo single pools are arranged between two adjacent test single pools; and the test analysis device is respectively connected with the more than two test single cells so as to obtain performance parameters of different test single cells in the same test pile. The fuel cell test system provided by the invention can perform rapid detection and effective comparison on the performance of various test single cells, is beneficial to rapid model selection of single cell membrane electrodes, and improves the development efficiency of fuel cells.

The invention relates to a membrane electrode with high oxygen permeability and a preparation method thereof, the membrane electrode comprises a proton exchange membrane, an anode catalyst layer and a cathode catalyst layer, the anode catalyst layer and the cathode catalyst layer are arranged on two sides of the proton exchange membrane, and anode catalyst slurry comprises an anode catalyst, an ionomer and a dispersing solvent in a mass ratio of 1: (1-10): (10-1000); the cathode catalyst slurry comprises a cathode catalyst, an ionomer, an ionic liquid and a dispersing solvent in a mass ratio of 1: (1-10): (1-10): (10-1000). Compared with the prior art, in order to solve the problem that oxygen mass transfer of a porous carbon carrier in a fuel cell catalyst layer is difficult, the method that ionic liquid and ionomer are mixed in advance, then slurry is prepared, and the slurry is sprayed to prepare the membrane electrode is adopted, so that a compact structure formed by an ionomer membrane on the surface of a catalyst is weakened, and the distribution uniformity of the ionomer membrane is improved; the local oxygen mass transfer resistance is obviously reduced, and the performance of the fuel cell under high current density is improved.

The invention discloses a preparation method of a proton exchange membrane water electrolysis hydrogen production membrane electrode, and belongs to the technical field of proton exchange membranes, a catalyst carrier is prepared, S101, a polyimide membrane is inversely fixed in a magnetron sputtering vacuum coating chamber, a cavity cover of the magnetron sputtering vacuum coating chamber is closed, vacuumizing is performed, and a substrate is heated; and S102, argon is introduced into a cavity of the magnetron sputtering vacuum coating chamber, coating is started, the power of the bismuth metal target is set to be 0.2-0.5 kW, and the deposition time is 60-1800 s. In the invention, the physical vapor deposition method is utilized to load the catalyst on the surface of the metal oxide carrier with high specific surface area and ordered nanostructure, so that the exposure of active sites of the catalyst is increased, the dosage of the noble metal catalyst is reduced, and the bonding strength between the catalyst and the carrier is enhanced; the catalyst is not easy to separate from the surface of the carrier, and large-scale slurry agglomeration is avoided.

The invention discloses a reactor core of an air-cooled fuel cell stack, the stack and a thermal management design method of the stack, and belongs to the technical field of fuel cells. The reactor core of the air-cooled fuel cell stack comprises a plurality of bipolar plates and a plurality of membrane electrodes which are sequentially stacked, the bipolar plate is formed by combining an anode plate and a cathode plate, a hydrogen runner is arranged on the anode surface, far away from the cathode plate, of the anode plate, and an air runner is arranged on the cathode surface, far away from the anode plate, of the cathode plate; and an air cooling runner is arranged between the anode plate and the cathode plate. The air-cooling fuel cell stack comprises the stack core, and the opening direction of the air-cooling flow channel on the stack core is opposite to the air supply direction of an air-cooling fan. By adopting the air-cooled fuel cell stack, the problems of difficulty in balancing oxygen and membrane water content, environmental sensitivity, unstable performance and the like of a cathode open type air-cooled fuel cell polar plate structure can be solved, the stack performance is improved, and the service life is prolonged.

The invention provides a self-humidifying CO2 membrane electrode structure and a preparation method thereof. The self-humidifying CO2 membrane electrode structure comprises an electrolyte isolation plate, the electrolyte isolation plate is provided with an anode side and a cathode side, the anode side is sequentially provided with a cation exchange membrane, an anode catalyst layer, a current collector and an anode electrode plate, and the cathode side is sequentially provided with an anion exchange membrane, a cathode catalyst layer and a cathode electrode plate; the anode electrode plate is provided with a first inlet, hydrogen enters the anode electrode plate from the first inlet and is subjected to a hydrogen oxidation reaction under the action of an anode catalyst to generate protons and electrons, and the protons are migrated to the electrolyte isolation plate through the cation exchange membrane; the cathode electrode plate is provided with a second inlet, CO2 gas enters the cathode electrode plate from the second inlet and is subjected to a reduction reaction under the action of a cathode catalyst to generate a reduction product and OH <->, and OH <-> is migrated to the electrolyte isolation plate through the anion exchange membrane to react with protons. The long-term operation stability of the membrane electrode structure is remarkably improved.

The present invention belongs to the field of electrochemistry, and specifically relates to an anion membrane electrode and a preparation method thereof, and a device for preparing synthesis gas by gas-phase electrolysis of carbon dioxide. The preparation method is as follows: a porous membrane protective layer is covered on the surface of a vacuum heating plate, and then an anion membrane is covered; then an anion exchange ionomer solution and a cathode catalyst anion exchange ionomer solution are sprayed on the surface in sequence. The present invention can reduce the structural damage to the anion membrane caused by the temperature fluctuation of the metal plate surface during the heating process of the vacuum heating plate by introducing a porous membrane protective layer between the anion membrane and the vacuum heating plate; the anion exchange ionomer layer is introduced between the catalyst layer and the anion membrane to increase the bonding strength between the catalyst layer and the anion membrane and increase the stability of the membrane electrode; during the volatilization process of the heating solvent, the solvent can be promoted to volatilize at low temperature by blowing dry, thereby accelerating the membrane electrode preparation process and improving the stability of the membrane electrode, thereby extending the service life of the device.

The invention discloses a modeling method and device for multiple physical fields of a membrane electrode electrolytic cell. The modeling method comprises the following steps: S1, obtaining related structural parameters, physical property parameters and chemical reaction parameters of a device; s2, according to the obtained physical property parameters, constructing an MEA multi-physical field numerical model; s3, analyzing a calculation result of the numerical model, and determining salting-out potential and salting-out current density of the CO2 membrane electrode assembly under working condition operation; s4, various design parameters of the MEA are adjusted, and the most suitable design parameters are determined according to the salting-out occurrence condition and the combination of the comprehensive performance of the device; and S5, under the corresponding salting-out potential, inhibiting salting-out by regulating and controlling related input parameters. The MEA multi-physical field model constructed by the method reflects information of various design parameters MEA more truly under working conditions or non-working conditions, is beneficial to deepening understanding of substance transfer on an MEA electrochemical performance influence factor mechanism, and provides guidance for practical application of CO2MEA.

The invention relates to the technical field of membrane electrodes, in particular to a membrane electrode catalyst layer with a gradient aperture structure and a manufacturing method thereof.The catalyst layer is attached to the side face of a proton exchange membrane through hot pressing, and the catalyst layer at least comprises three catalyst sub-layers; the catalytic sublayer comprises ultrapure water, an organic solvent, a catalyst, a foaming agent and an ionomer; in the direction far away from the proton exchange membrane, the mass ratio of the catalyst to the foaming agent in different catalytic sub-layers is gradually reduced, and the pore diameter and the porosity in the catalytic layers are gradually increased. The membrane electrode catalyst layer provided by the embodiment of the invention can reduce the probability of'flooding 'of the gas diffusion layer (GDL) and improve the transmission performance of battery gas and reactants.

The invention belongs to the technical field of membrane electrodes, and particularly relates to a hydrogen fuel cell catalyst layer slurry based on hydrophilic and hydrophobic regulation and a preparation method of a membrane electrode. The slurry of the catalyst layer comprises the following contents: the slurry of the PEM close to the cathode side comprises a Pt / C catalyst, deionized water, a perfluorosulfonic acid ionic polymer solution and isopropanol; the mass ratio, namely I / C ratio, of the ionic polymer to the carbon carrier is 0.8-1.2; the GDL cathode side slurry comprises a Pt / C catalyst, deionized water, a perfluorosulfonic acid ionic polymer solution, a PTFE aqueous solution (polytetrafluoroethylene aqueous solution) and isopropanol, and the mass ratio of the ionic polymer to the carbon carrier, namely I / C ratio, is 0.3-0.5. High hydrophilic ionomer content is reserved on the side, close to the cathode, of the PEM, proton conduction and catalyst active site wetting are guaranteed, the proportion of hydrophobic ionomers and hydrophobic materials is increased on the GDL side, a drainage channel is formed, liquid water is prevented from blocking gaps, then the performance of the membrane electrode is remarkably improved, and the interface contact resistance is stabilized to be 1.64-1.76 m omega (2.5 A / cm < 2 >).

The invention discloses a method for preparing a high-performance AEM water-electrolyzed hydrogen production membrane electrode, which comprises the following steps: respectively preparing an AEM water-electrolyzed hydrogen production anode and an AEM water-electrolyzed hydrogen production membrane cathode, then placing the AEM water-electrolyzed hydrogen production anode and the AEM water-electrolyzed hydrogen production cathode on two sides of an anion exchange membrane, and sealing edges to prepare the AEM water-electrolyzed hydrogen production membrane electrode, the preparation method comprises the following steps: mixing catalyst powder with a solvent to prepare catalyst prefabricated slurry, adding an anion exchange resin solution in batches, adding a hydrophobic binder to prepare catalyst slurry, coating the surface of a hydrophobic modified diffusion layer with the slurry, and finally coating the surface of the diffusion layer with the anion exchange resin solution to prepare the hydrophobic modified diffusion layer. And soaking in an organic solvent, and washing. According to the prepared AEM water electrolysis hydrogen production membrane electrode, on the basis that oxygen bubble retention can be reduced, the stability is improved, and meanwhile the activity of the membrane electrode is improved.

To provide a fuel battery cell that can improve durability of a membrane electrode joined body, and a method for designing a fuel battery cell.SOLUTION: A fuel battery cell comprises: a membrane electrode joined body that generates power by using reaction gas; a pair of gas diffusion layers that sandwich the membrane electrode joined body; and a pair of separators 14 that sandwich the membrane electrode joined body and the pair of gas diffusion layers. The gas diffusion layer has a Young's modulus of 1800 MPa or more and a thickness of 0.12 mm or more and 0.25 mm or less. The separator 14 has a groove 29 that has a branch part 31 and forms a channel 28 for supplying the reaction gas to the membrane electrode joined body. A value obtained by dividing the diameter D of an inscribed circle 33 of the branch part 31 in the groove 29 by a groove width W of a general part 32 other than the branch part 31 in the groove 29 is 2.5 or less.SELECTED DRAWING: Figure 3

A membrane-electrode assembly for a water electrolyser is provided. The membrane- electrode assembly comprises a polymer electrolyte membrane with a first face and a second face; an anode catalyst layer on the first face of the membrane, the anode catalyst layer comprising an oxygen evolution reaction catalyst; and a porous web of polymer fibres in contact with the anode catalyst layer, the polymer fibres comprising a conductive metal additive.

The invention discloses a catalyst for a high-temperature proton exchange membrane fuel cell as well as a preparation method and application of the catalyst. The catalyst of the high-temperature proton exchange membrane fuel cell comprises a carbon carrier and Pt nano-particles loaded on the carbon carrier, and at least part of the surface of the Pt nano-particles is coated with manganese dioxide. According to the catalyst of the high-temperature proton exchange membrane fuel cell, the Pt nano-particles are coated with the manganese dioxide, catalytic active sites of the catalyst can be protected after coating, the poisoning effect of phosphoric acid on the catalyst at high temperature is relieved, and the performance of the high-temperature proton fuel cell is improved. In addition, manganese dioxide not only can be used as a protective layer, but also can form a new proton conductor with phosphoric acid, so that a proton transmission channel of the membrane electrode under a high-temperature working condition is improved, and the performance of the high-temperature proton fuel cell is improved.

The invention discloses a nano-alloy catalyst for anion exchange membrane electrolyzed water and a preparation method of a membrane electrode of the nano-alloy catalyst, when any one of manganese salt, cerium salt, chromium salt, cobalt salt, lanthanum salt, ruthenium salt and iridium salt is not added, NiFe binary alloy powder is obtained, the content of Ni is 90%-100%, and the content of Fe is 0%-10%; when any one of manganese salt, cerium salt, chromium salt, cobalt salt, lanthanum salt, ruthenium salt and iridium salt is added, NiFe ternary alloy powder is obtained, the content of Ni is 76%-96%, the content of Fe is 4%, and the content of the third element is 0%-20%. The nano-alloy catalyst material for anion exchange membrane water electrolysis prepared according to the invention is good in corrosion resistance and high in stability, the total water splitting efficiency is further improved, the synthesis method is simple, the used metal salt is low in cost, the metal salt can be uniformly loaded on a substrate carrier through spraying, and industrial application of total water splitting under high current density is easy to realize.

The invention discloses a passive thermal management system and method for a proton exchange membrane fuel cell, the passive thermal management system comprises a fuel cell stack, the fuel cell stack comprises bipolar plate end plates arranged at two ends and a cell unit serially distributed between the two groups of bipolar plate end plates, the cell unit comprises a bipolar plate and a heat pipe array plate, the bipolar plate is internally provided with a groove, the heat pipe array plate is embedded in the groove of the bipolar plate, the phase change heat storage header is arranged at the top of the fuel cell stack and comprises a water-cooling heat exchange tube bundle in conduction fit with a cell unit and a temperature sensor, the temperature uniformity in the cell is improved, and the heat pipe array plate is compact in overall structure and high in heat exchange efficiency. The space utilization rate of the stack is effectively improved, the evaporation section and the condensation section of the capillary heat pipe both have good temperature conductivity, the temperature uniformity in the fuel cell stack is improved, the heat of the fuel cell stack can be quickly recovered, and the operation environment of the membrane electrode assembly can be effectively maintained; and the water-cooling heat exchange tube bundle is combined with real-time adjustment of the control module, so that convective heat exchange is enhanced, and heat preservation and rapid cold start of the fuel cell stack can be realized.

The present application discloses a control device for controlling cold starting of a fuel cell system. The fuel cell system comprises a stack, a load and a cooling loop; the stack comprises an electrode plate and a membrane electrode assembly; and the control device comprises: a measurement module, configured to measure an initial temperature T0 of the stack; a calculation module, configured to calculate an internal temperature T of the stack on the basis of the initial temperature T0 and the output current I and the output voltage U outputted from the stack to a load; a determination module, configured to compare the calculated internal temperature T with a threshold temperature Tth; and an adjustment module, configured to, when the internal temperature T is greater than the threshold temperature Tth, increase the flow volume Qcoolant of a coolant in a cooling circuit flowing through the stack. The present application further discloses a fuel cell system comprising the control device, a control method for the fuel cell system and a computer readable storage medium. The present application can realize rapid and safe cold starting of the fuel cell system.

The invention discloses a membrane electrode, a preparation method thereof and a fuel cell, the membrane electrode comprises a catalyst layer and a proton exchange membrane, the catalyst layer comprises an anode catalyst layer and a cathode catalyst layer, and the anode catalyst layer and the cathode catalyst layer are respectively arranged on two sides of the proton exchange membrane; the catalyst layer and the proton exchange membrane are both doped with phosphoric acid. By macroscopically regulating and controlling the PA content of the catalyst layer and the proton exchange membrane in the membrane electrode, more three-phase reaction interfaces are constructed, so that the Pt catalyst can be fully utilized, and unnecessary migration of PA is reduced, thereby avoiding the phenomenon of acid flooding, ensuring sufficient PA in the proton exchange membrane to provide sufficient proton conductivity, and improving the proton exchange efficiency. And the power density of the fuel cell is further improved.

The preparation method comprises the following steps: mixing a catalyst, a pore forming agent, an ionomer and a solvent, carrying out ultrasonic treatment in an ice-water bath until the mixture is uniformly dispersed, then coating a polytetrafluoroethylene membrane with the mixture to obtain a catalytic layer, and then carrying out hot pressing and transferring the catalytic layer to two sides of a proton exchange membrane to obtain the membrane electrode. The catalyst layer of the prepared membrane electrode has a cross-linked porous network structure formed in situ when the pore forming agent is pyrolyzed and separated in the hot-pressing transfer printing process, so that the specific surface area of a three-phase interface and the utilization rate of a noble metal catalyst are increased, the gas and liquid mass transfer resistance of the membrane electrode is reduced, and the material transmission capability is improved; the performance of the membrane electrode is improved, and the membrane electrode has more excellent stability.

The present invention relates to a membrane electrode for reducing the hydrogen content in oxygen of a PEM water electrolyzer and a preparation method thereof, by simply adding an organic silicone resin solution in the cathode catalyst slurry preparation process, changing the mass transfer and transfer from the catalyst layer to the porous transmission layer after hydrogen is generated in the test process, reducing the hydrogen flux of hydrogen permeating from the cathode to the anode, and thus reducing the hydrogen content in oxygen. The present invention has the advantages of low preparation cost, simple process and easy operation, and excellent performance.