1371 results about "Gas diffusion layer" patented technology

A advanced fuel cell (AFC) assembly comprises a variety of features improving its performance, reliability, durability, and manufacturability include an ion exchange membrane such as a proton exchange membrane comprising polymers of perfluorinated sulfonic acid or hydrocarbon compounds supported by an inert endoskeletal structure of greater mechanical strength preventing deformation damage from handling, temperature cycling, and ionomer swelling and contraction from humidity cycling. The endoskeleton may be attached to wider exoskeletal pillars used for singulating one membrane from another after fabrication and to a thicker handle used to transport the membrane during processing prior to separation. Other AFC features include a asymmetric catalyst coated membrane inhibiting fuel cross over, oxygen back streaming, and CO atmospheric poisoning; a graded heterogenous gas diffusion layer for enhanced charge and gas transport; and a self-aligned gasket-less assembly with integrated sealant preventing gas leakage.

The present disclosure relates to a field of a fuel cell test, and in particular, to a method and an apparatus for optimizing design based on performance evaluation of a gas diffusion layer of a fuel cell. The method includes: determining an overall porosity of the gas diffusion layer of the fuel cell according to production requirements, and obtaining a plurality of porosity structures with the overall porosity; obtaining performance evaluation indexes of the gas diffusion layer of the fuel cell, and constructing a performance evaluation system for the gas diffusion layer of the fuel cell; calculating, with reference to evaluation functions and index weight ratios, performance comprehensive scores of the plurality of porosity structures in the performance evaluation system of the gas diffusion layer of the fuel cell; determining an optimal design scheme in the plurality of porosity structures according to the performance comprehensive scores.

The invention discloses a PEM electrolytic cell GDL performance test method and system based on multi-dimensional parameters. The method comprises the steps that a sensor array is used for collecting the gas transmission rate, conductive resistance and mechanical deformation data in real time when a GDL gas diffusion layer operates; preprocessing and synchronously analyzing the acquired data to generate a feature matrix with multi-dimensional performance parameters; based on the generated feature matrix, a deep reinforcement learning algorithm is adopted to dynamically adjust test conditions so as to optimize a test process; performing comprehensive scoring on test results under different working conditions by using an adaptive weighted fusion algorithm; and according to the comprehensive score and the actual working condition demand, dynamically adjusting the test process through a feedback control mechanism until the test result meets the actual working condition demand. Through the integrated sensor array module, real-time monitoring and analysis of multi-dimensional parameters are realized. The comprehensive performance of the GDL in an actual working condition environment can be comprehensively considered through the multi-dimensional parameter comprehensive evaluation capability, and a more comprehensive and accurate basis is provided for performance evaluation of the GDL.

The invention relates to the technical field of fuel cells, in particular to a preparation method of carbon fiber paper for a gas diffusion layer of a fuel cell. Comprising the following steps: adding phenolic resin, a dispersing agent, an anti-settling agent, asphalt and a graphitization template agent into a mixed solvent, and mixing and dispersing to prepare a resin impregnation liquid; and immersing the carbon fiber raw paper into the resin impregnation liquid for impregnation, drying, and then carrying out hot-pressing curing and graphitization treatment to obtain a final product. Part of phenolic resin is replaced with asphalt, a graphitization template agent is introduced, the graphitization temperature of the carbon fiber paper is reduced, the graphitization degree of resin carbon is improved, and the problems that asphalt and the graphitization template agent are difficult to disperse and easy to settle in phenolic resin impregnation liquid are solved by optimizing the formula of the resin impregnation liquid; according to the present invention, the asphalt, the phenolic resin and the graphitization template agent are loaded on the carbon paper body paper through the one-step impregnation, such that the advantages of simple process, low graphitization temperature and low energy consumption are provided, and the prepared carbon fiber paper has good conductivity.

The invention belongs to the technical field of fuel cells, and particularly relates to a gradient pore cathode catalyst layer membrane electrode and a preparation method thereof.The preparation method comprises the following steps that a perfluorinated sulfonic acid resin solution is added into a water-alcohol mixed solvent to be cured, and a low-molecular-weight pore-forming agent and a high-molecular-weight pore-forming agent are added respectively; coating the cathode side of the proton exchange membrane with inner catalyst layer slurry containing a low-molecular-weight pore-forming agent to form a cathode inner catalyst layer; coating the gas diffusion layer side with outer catalyst layer slurry containing a high molecular weight pore forming agent to form a cathode outer catalyst layer; and packaging the proton exchange membrane coated with the cathode inner catalyst layer and the anode catalyst layer by using a frame, respectively adhering a gas diffusion layer coated with the cathode outer catalyst layer and an anode gas diffusion layer, performing hot pressing to prepare a membrane electrode, and removing the pore-forming agent. The pore structures of the inner and outer catalyst layers are adjusted by using pore-forming agents with different molecular weights, and the gradient pore catalyst layer is constructed, so that the oxygen transmission resistance of the membrane electrode is reduced, and the battery performance is improved.

The invention belongs to the technical field of fuel cells, and particularly relates to carbon paper for a gas diffusion layer with a water-gas management function and a preparation method of the carbon paper. The carbon paper for the gas diffusion layer comprises at least three alternately stacked carbon layer structures, odd layers are macroporous carbon layers, and the macroporous carbon layers are formed by dipping carbon fiber base paper in a mixed solution of resin and a conductive material and drying the carbon fiber base paper; the even-numbered layers are small-hole carbon layers, and the small-hole carbon layers comprise resin and conductive materials and are coated on the surfaces of the odd-numbered layers; the odd-numbered layers and the even-numbered layers are compounded through a hot-pressing process to form a composite material; the composite material is subjected to high-temperature heat treatment to form a carbon paper A conductive network is formed in the carbon paper, the carbon paper with higher conductivity is prepared, part of the conductive material is filled in the carbon paper to build a microporous structure, the low-gram-weight base paper forms a macroporous structure, and the conductive material and the resin are mixed to form a microporous structure, so that the water and gas management capability is favorably improved.

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 discloses a bipolar plate structure optimization method and system based on flow field data analysis, and relates to the technical field of fuel cells. The method comprises the following steps: establishing a parameterized bipolar plate runner geometric solid model; performing compression deformation simulation of a gas diffusion layer on the bipolar plate flow channel geometric solid model to obtain physical field data of the gas diffusion layer, and calculating a porosity distribution field and a local mass transfer impedance coefficient field based on the physical field data; based on the porosity distribution field and the local mass transfer impedance coefficient field, multi-physics field coupling simulation is carried out, and a local performance contribution degree field is obtained; constructing a comprehensive loss function according to the local mass transfer impedance coefficient field and the local performance contribution degree field; and with the purpose of minimizing the comprehensive loss function, iterative optimization is carried out on the design variables through an optimization algorithm until convergence conditions are met, and an optimal design variable combination is output. Through parametric modeling, multi-physics field coupling simulation and comprehensive loss function evaluation, efficient optimization of the bipolar plate design is realized.

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 relates to a membrane electrode and a preparation method thereof and a PEM electrolytic bath, the membrane electrode comprises a proton exchange membrane and functional layers located on the two sides of the proton exchange membrane, each functional layer comprises a gas diffusion layer and a catalyst layer, the catalyst layer is located between the proton exchange membrane and the gas diffusion layer, and the gas diffusion layer and the catalyst layer are each of a porous structure; a conductive structure is arranged between the gas diffusion layer and the catalyst layer, and the conductive structure exists in the form of a layered structure or a dotted structure. According to the membrane electrode disclosed by the invention, the gas diffusion layer and the catalyst layer form a multi-stage porous structure, so that the membrane electrode can reduce the dosage of a catalyst under the same catalytic activity, reduce the material cost of the catalyst and enhance the binding capacity between the catalyst layer and the gas diffusion layer. The conductive structure improves the conductivity of the membrane electrode, reduces the corrosion of the gas diffusion layer in the long-time working process, and improves the bonding performance between the gas diffusion layer and the catalyst layer.

The invention relates to the technical field of fuel cells, in particular to a preparation method of multi-gradient pore structure carbon fiber paper for a gas diffusion layer of a fuel cell and the carbon fiber paper. The preparation method comprises the following steps: carrying out mechanical treatment on artificial fibers, and carrying out solid-liquid separation to obtain mechanically treated artificial fiber slurry; mixing the fiber slurry with nanofibers and surface modified carbon fibers to prepare composite fiber slurry; an inclined wire wet forming process is adopted, the pore structures of the carbon fiber base paper are regulated and controlled by adjusting the proportion of fibers with different sizes, and the carbon fiber base paper with different pore structures is subjected to multi-layer compounding according to a certain gradient of low, medium and high; after compounding, the carbon fiber paper with a multi-gradient pore structure is prepared through the processes of resin impregnation, hot-pressing curing, carbonization, graphitization and the like. The preparation method provided by the invention is simple and convenient in process flow, meets the requirements of high conductivity, high air permeability and high strength of the carbon fiber paper, optimizes the drainage capacity of the battery, and improves the battery performance.

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 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 relates to a gas diffusion layer double-layer microporous structure and a preparation method thereof, and belongs to the technical field of fuel cells. The gas diffusion layer comprises a substrate layer, a hydrophobic microporous layer and a hydrophilic microporous layer which are stacked in sequence; wherein a polymer with a metal ion adsorption function is added into the hydrophilic microporous layer, so that metal ion pollution can be reduced, and the degree of adverse effects on the battery performance due to the fact that metal ions enter the catalyst layer is reduced; the super-hydrophobic macroporous structure of the hydrophobic microporous layer ensures the excellent drainage capacity of the proton exchange membrane fuel cell during high-current-density operation, and the hydrophilic microporous layer serving as a transition layer has the functions of reducing contact resistance and improving the performance of a low-current-density region in the proton exchange membrane fuel cell. Through the design, the double-layer microporous structure of the gas diffusion layer prepared by the invention has the characteristics of efficient water management and metal ion capture function.

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

The invention provides a gas diffusion layer and a preparation method and application thereof. The preparation method of the gas diffusion layer comprises the following steps: S1, providing a porous nickel felt which is made of nickel fibers; s2, mixing a hydrophilic modifier, a solvent and graphene oxide to obtain a coating liquid; and S3, the surface of one side of the porous nickel felt is coated with the coating liquid, and the gas diffusion layer is obtained after drying treatment. The porous nickel felt is adopted as a base material of the gas diffusion layer, and compared with traditional foamed nickel or a nickel net, the porous nickel felt can provide a pore channel structure and improve the mechanical strength of a base body at the same time, so that the effect of supporting the catalyst layer can be achieved, and hydrogen can be conveniently discharged. The introduction of the hydrophilic modifier can improve the hydrophilicity of the gas diffusion layer, thereby improving the electrochemical reaction efficiency of the cathode. The surface of the graphene oxide contains a large number of oxygen-containing functional groups, and the conductivity of the gas diffusion layer can be improved by introducing the graphene oxide into the coating liquid and coating.

The invention relates to the technical field of new energy materials, and discloses a gradient porous three-dimensional interpenetrating network direct ammonia fuel cell membrane electrode. The gradient porous three-dimensional interpenetrating network direct ammonia fuel cell membrane electrode comprises an exchange membrane, an anode catalyst layer, a cathode catalyst layer and a gas diffusion layer, wherein the anode catalyst layer and the cathode catalyst layer have gradient pore size distribution from the exchange membrane side to the gas diffusion layer side; wherein the interiors of the anode catalyst layer and the cathode catalyst layer are provided with three-dimensional interpenetrating network structures. According to the invention, the utilization rate of the catalyst is improved by 30-50%, the mass transfer resistance is reduced by 40-60%, the interface contact is improved, the controllability of the preparation process is improved, the structural stability is enhanced, the power density of the direct ammonia fuel cell reaches 250-300mW / cm < 2 >, the performance retention rate after 5000 cycles can reach 85% or more, and the method has remarkable technical advantages and application prospects.

The invention discloses a gas diffusion layer reconstruction and two-phase flow model combination method considering a binder structure, which comprises the following steps of: establishing a gas diffusion layer pure fiber structure by utilizing a random reconstruction method, reconstructing the binder structure by adopting a morphological closed operation algorithm, and regulating and controlling the size of a structure operator to obtain a two-phase flow model. The effective control on the structural volume ratio and the porosity of the binder is realized. A two-phase flow model is established based on reconstruction of a gas diffusion layer with a real structure, so that the flow process of liquid water in the gas diffusion layer is solved and calculated. According to the method, the pore structure of the gas diffusion layer of the fuel cell can be reconstructed more accurately, and structural parameter changes of the gas diffusion layer caused by the existence of the binder, including changes of key parameters such as porosity, pore diameter and tortuosity, can be obtained. The characteristics of the two-phase flow process in the gas diffusion layer can be visually, rapidly and accurately obtained, the relation between the structure of the gas diffusion layer and the two-phase flow process is defined, and the structure of the gas diffusion layer is optimized.

The invention discloses an anode composite catalyst layer and slurry thereof, a preparation method and a membrane electrode, the anode composite catalyst layer is located between a proton exchange membrane and a gas diffusion layer of the membrane electrode, the anode composite catalyst layer comprises an iridium catalyst layer, the iridium catalyst layer has a first surface and a second surface which are opposite, the first surface faces the proton exchange membrane, and the second surface faces the gas diffusion layer. The second surface faces the gas diffusion layer, and the iridium catalyst layer comprises a first ionomer and an iridium catalyst dispersed in the first ionomer; the platinum conducting layer is provided with a third surface and a fourth surface which are opposite to each other, the third surface is in contact with the second surface of the iridium catalyst layer, the fourth surface faces the gas diffusion layer, and the platinum conducting layer comprises a second ionomer and platinum nano-particles which are dispersed in the second ionomer and have the particle size ranging from 10 nm to 500 nm. According to the anode composite catalyst layer, the membrane electrode has relatively low contact resistance and excellent stability.

The invention discloses a thermally stable gas diffusion layer material and a fuel cell, and relates to the field of fuel cells. When the heat-stable gas diffusion layer material is prepared, short-cut polyacrylonitrile carbon fibers are subjected to papermaking and then cured, and 3-aminothiophene is oxidized and grafted to prepare a modified carbon paper base layer; the preparation method comprises the following steps: carrying out a reaction on a single-layer graphene oxide nanosheet, 6-amino-2-mercaptobenzothiazole and 3-aminoethyl thiophene to prepare a modified single-layer graphene oxide nanosheet; the preparation method comprises the following steps: reacting polyvinylidene fluoride powder, 3-allyl thiophene and single-ended vinyl silicone oil to prepare a modified polyvinylidene fluoride emulsion; and uniformly mixing the modified single-layer graphene oxide nanosheet, a modified polyvinylidene fluoride emulsion and isopropanol, spraying on the modified carbon paper base layer, and reacting with 3, 4-ethylenedioxythiophene to prepare the thermally stable gas diffusion layer material. The thermally stable gas diffusion layer material prepared by the method has excellent porosity, thermal stability, conductivity and corrosion resistance.

The invention discloses a multi-component atomic level oxide solid solution integrated electrode for electrolyzed water and a preparation method thereof, and belongs to the field of metal material surface plating. The electrode is composed of a gas diffusion layer, a nano array substrate and an atomic level oxide solid solution catalyst layer. The preparation method comprises the following steps: constructing a nano array microreactor on the surface of the gas diffusion layer; the method comprises the following steps: driving an atomic hierarchy solid solution to reconstruct by utilizing an array confinement effect through combination of precursor directional spraying and a heat treatment-rapid quenching process, and constructing a three-dimensional conformal ionomer network on the surface of the atomic hierarchy solid solution; and performing gold plating treatment on the back side of the electrode. Through the synergistic effect of spatial constraint and thermodynamic regulation of the nano microreactor, the traditional electrode interface mismatch bottleneck is broken through, and while precise construction of atomic-scale active sites is realized, the mechanical stability and oxygen evolution reaction kinetics of the electrode are improved. The preparation process has the advantages of controllable flow, strong large-scale expansibility and good industrial preparation prospect.

The invention provides a membrane electrode and a proton exchange membrane fuel cell, and particularly relates to the technical field of fuel cells. The membrane electrode comprises an anode gas diffusion layer, an anode catalyst layer, a proton exchange membrane, a cathode catalyst layer and a cathode gas diffusion layer which are sequentially stacked, and the anode gas diffusion layer comprises a hydrophilic microporous layer. According to the membrane electrode provided by the invention, the hydrophilic microporous layer is arranged in the anode gas diffusion layer, and water vapor generated by the anode catalyst layer is absorbed and transferred by the hydrophilic microporous layer at the first time and then is transferred and discharged by the hydrophobic microporous layer, so that water and gas on the anode side are uniformly distributed, water logging is avoided, and the gas mass transfer process on the anode side is improved; and normal operation of the membrane electrode is further ensured.

The invention relates to a proton-exchange membrane fuel cell with improved contact properties between the gas diffusion layers (GDL) and the catalyst-coated polymer-electrolyte membrane (CCM), to a gas diffusion layer, to a method for producing a gas diffusion layer, and to a method for producing a proton-exchange membrane fuel cell which exhibits an improved contact at the boundary surface between the gas diffusion layers and the catalyst-coated polymer-electrolyte membrane. The gas diffusion layer comprises a carbon fiber nonwoven material or a carbon fiber paper comprising carbon fibers which have a main orientation direction with respect to the base surface of the nonwoven material or paper, said main orientation direction not being parallel to the main orientation of the channels of an adjacent flow distributor plate.

The invention discloses a PEM gas diffusion layer for hydrogen production by electrolyzing water, the gas diffusion layer is formed by metallurgical bonding of a titanium microporous layer and a titanium substrate layer, the total thickness of the gas diffusion layer is 110-490 [mu] m, the thickness of the titanium microporous layer is 10-100 [mu] m, the average aperture of the titanium microporous layer is 1-8 [mu] m, the thickness of the titanium substrate layer is 100-480 [mu] m, the average aperture of the titanium substrate layer is 10-25 [mu] m, and the thickness of the titanium substrate layer is 10-30 [mu] m. The invention also discloses a preparation method of the gas diffusion layer, which comprises the following steps: pressing titanium powder to obtain a green body thin strip, then spraying slurry on the green body thin strip, and finally degreasing and sintering. The pore diameter of the titanium substrate layer is regulated and controlled by controlling the particle size of the titanium powder, the feeding speed and the rotating speed of the roller, the pore diameter of the titanium microporous layer is regulated and controlled by controlling the slurry ratio, the particle size of the small-particle titanium powder and the pressure of the spray gun, and the gas diffusion layer for PEM water electrolysis hydrogen production, which ensures the gas-liquid transmission efficiency and effectively reduces the catalyst loading capacity, can be prepared only through one-step sintering.

A multiple-layer gas diffusion electrode for sustaining electrochemical reduction of gaseous CO2 and / or CO into multi-carbon products is provided, including a gas diffusion layer comprising a support layer, a microporous layer having pores that are sized to maintain the gaseous CO2 and / or CO, or a combination thereof available for electroreduction, and a catalytic layer comprising a catalyst favoring reduction of the CO2 and / or CO. There are also provided, a method for producing the gas diffusion electrode, a spacer being positionable between an ion exchange membrane and an anode of a membrane electrode assembly, a reactor including a membrane electrode assembly and a support structure, a stack reactor that can include the gas diffusion electrode and the spacer as described herein, a method to diagnose and isolate at least one faulty repeat cell unit in an electrolyzer stack reactor, and a rinsing method for facilitating operation of an electroreduction system.

The utility model provides a gas diffusion layer suitable for a cathode gas diffusion layer, and the gas diffusion layer is a multi-layer foam metal gas diffusion layer. The porosity of the multiple foam metal gas diffusion layers ranges from 50% to 90%. The multi-layer foam metal gas diffusion layer at least comprises a first diffusion layer and a second diffusion layer which are arranged in an overlapped mode, and the first diffusion layer is arranged close to the CCM unit. The utility model further discloses a membrane electrode structure and an air-cooled fuel cell. The gas diffusion layer provided by the utility model has more excellent thermal conductivity, is more beneficial to transfer heat generated by chemical reaction to the cathode flow channel so as to take away the heat, and is beneficial to discharge of water generated by the reaction. The air-cooled fuel cell provided by the utility model has relatively good moisture retention capability, and can effectively avoid the phenomena that the performance of the cell is reduced and the service life of the cell is quickly attenuated due to insufficient infiltration of the membrane electrode which is too dry.

The present invention relates to the field of fuel cell technology, and in particular, to a method for preparing carbon fiber paper for a fuel cell gas diffusion layer. The method comprises the following steps: adding phenolic resin, dispersant, anti-settling agent, asphalt and graphitization template agent into a mixed solvent for mixing and dispersing to obtain a resin impregnation solution; immersing carbon fiber base paper into the resin impregnation solution for impregnation, drying, and then subjecting to hot pressing curing and graphitization treatment to obtain a final product. Asphalt is used to replace part of the phenolic resin, and a graphitization template agent is introduced to reduce the graphitization temperature of the carbon fiber paper and improve the graphitization degree of the resin carbon. By optimizing the formula of the resin impregnation solution, the problem that asphalt and graphitization template agent are difficult to disperse and easy to settle in the phenolic resin impregnation solution is solved, and the asphalt, phenolic resin and graphitization template agent are loaded on the carbon paper base paper by a one-step impregnation method. The method has the advantages of simple process, low graphitization temperature and low energy consumption, and the prepared carbon fiber paper has good conductivity.

To make an adhesive less likely to spread beyond a desired application area when bonding a gas diffusion layer to an intermediate layer in the manufacturing stage of a fuel cell.SOLUTION: Using an adhesive coating system, an adhesive is applied on an intermediate layer in a manufacturing step of a fuel cell with the intermediate layer and gas diffusion layers on both sides of the intermediate layer. The adhesive application system has an application unit, a robot arm, and a controller. The application unit applies an adhesive when a valve is opened. The robot arm can move the application unit. The controller controls the valve and the robot arm. The controller linearly applies the adhesive to the intermediate layer from the application start point, by opening the valve before the application unit becomes located immediately on the application start point while moving the application unit by the robot arm.SELECTED DRAWING: Figure 3

The invention relates to the field of fuel cells, and particularly discloses a gas diffusion layer, a preparation method thereof and a proton exchange membrane fuel cell applying the gas diffusion layer, and the preparation method of the gas diffusion layer comprises the following steps: preparing porous substrate layer carbon paper; performing hydrophobic treatment on the porous substrate layer carbon paper to obtain hydrophobic carbon paper; a hydrophobic agent and water are mixed to obtain hydrophobic slurry A, conductive powder, a surfactant, a binder and an organic solvent are mixed and dispersed to obtain conductive powder slurry B, the hydrophobic slurry A and the conductive powder slurry B are mixed to form spraying slurry C, the spraying slurry C is sprayed on hydrophobic carbon paper while being stirred, drying and curing are conducted after spraying, and a microporous layer is formed. A gas diffusion layer is obtained; the invention further discloses the gas diffusion layer prepared by adopting the method and the proton exchange membrane fuel cell applying the gas diffusion layer. The application has the characteristics of solving the problems of dispersion uniformity of the conductive powder in the slurry and sedimentation in the coating process, improving the quality of the microporous layer and further improving the performance of the fuel cell.

The invention belongs to the technical field of flow batteries, and provides a flow battery system and a balancing method, and the flow battery system comprises a charging and discharging unit which comprises a negative electrode electrolyte storage tank, a first electric pile and a positive electrode electrolyte storage tank. And the composite reactor floats at the waterline position of the positive electrode electrolyte storage tank and comprises a gas diffusion layer, a second ion exchange membrane, a capillary action layer and an electrolyte transport layer which are sequentially stacked, and the gas diffusion layer is higher than the waterline position of the positive electrode electrolyte storage tank. By adopting the flow battery system with the composite reactor, the charge balance of the electrolyte can be recovered through the oxidation-reduction reaction, the electrolyte chemical reduction efficiency and the electrolyte balance efficiency of the flow battery system are improved, the positive electrode electrolyte and the negative electrode electrolyte of the flow battery can be ensured to be completely recovered to the initial state, and the service life of the flow battery is prolonged. And the power consumption and the cost for recovering the performance and the capacity of the flow battery system are greatly reduced.