PEM electrolyzed water membrane electrode assembly and preparation method thereof

Abstract

The invention discloses a PEM water electrolysis membrane electrode assembly and a preparation method, and relates to the technical field of proton exchange membrane water electrolysis hydrogen production. The assembly comprises a cathode catalyst layer, an anode catalyst layer, a cathode gas diffusion layer, an anode gas diffusion layer, a frame film and an adhesive layer, and the adhesive layer contains UV curing adhesive and pressure-sensitive adhesive which are located between the edge of the catalyst layer and the gas diffusion layer and between the edge of the catalyst layer and the frame film and on the outer side of the frame film respectively. According to the preparation method, a continuous process is adopted, the catalyst layer is formed through intermittent coating, the gas diffusion layer and the frame film are positioned and attached by spraying the UV curing adhesive, the pressure-sensitive adhesive is sprayed after UV curing, and the negative electrode is prepared through repeated operation of turning over. Swelling of the proton exchange membrane can be inhibited, dislocation of a gas diffusion layer is avoided, the attaching sealing performance of the frame membrane is improved, the flatness and uniformity of the assembly are improved, the hydrogen leakage risk is reduced, and the method is suitable for efficient green hydrogen preparation.

Description

Technical Field

[0001] This invention belongs to the field of proton exchange membrane (PEM) water electrolysis hydrogen production technology, specifically relating to a membrane electrode assembly for PEM water electrolysis and its preparation method, which is particularly suitable for efficient, stable and low-cost green hydrogen production scenarios. Background Technology

[0002] With the global energy structure shifting towards clean energy, green hydrogen, as a zero-carbon energy carrier, has attracted widespread attention for its production technology. Electrolysis of water is one of the core technologies for green hydrogen production. Among them, proton exchange membrane (PEM) electrolysis technology has become a focus of industry research and application due to its advantages such as compact structure, high electrolysis efficiency, ability to produce high-purity hydrogen under high pressure, and good compatibility with intermittent wind and solar renewable energy sources.

[0003] The membrane electrode assembly (MEA) is the "heart" of a PEM electrolyzer, and its performance directly determines the efficiency, stability, and cost of hydrogen production through water electrolysis. An ideal MEA must meet multiple requirements, including low permeability, excellent proton conductivity, good water absorption, low swelling ratio, outstanding chemical and mechanical stability, low cost, and high durability. Currently, the mainstream fabrication technology for MEAs is catalyst-coated membrane (CCM) technology. This involves coating the proton exchange membrane with a catalyst through methods such as transfer printing, direct spraying, or deposition, and then assembling porous transport layers (i.e., gas diffusion layers) for the anode and cathode on both sides of the CCM.

[0004] The membrane electrode technology used in PEM water electrolysis almost universally employs catalyst-coated membrane (CCM) technology. Generally, the catalyst is transferred to both sides of the proton exchange membrane (PEM) via transfer printing, direct spraying, or deposition. In a PEM electrolyzer, porous transport layers for the anode and cathode are assembled on either side of the CCM. The advantage of this preparation method is that the CCM is easy to mass-produce. However, due to the unique hydrophilic and hydrophobic properties of the PEM, membrane swelling and deformation are prone to occur during the coating of the catalyst slurry on the second side, leading to uneven catalyst layer or membrane electrode swelling failure. Furthermore, misalignment of the cathode and anode gas diffusion layers can easily occur during electrolyzer assembly, potentially resulting in increased impedance and PEM puncture. Alternatively, a porous transport electrode can be fabricated by coating the catalyst layer onto the gas diffusion layer, thus creating a gas diffusion layer electrode. This method leads to higher consumption of precious metal catalysts and significantly increases ohmic losses within the electrolyzer. It is generally believed that the CCM configuration provides better contact between the membrane and catalyst, reducing interfacial impedance and improving proton conductivity and durability. However, this method still requires bonding the anode and cathode gas diffusion layers during the fabrication of subsequent membrane electrode assemblies. Due to the unevenness of the CCM, the gas diffusion layer may have stretching and bending defects, causing breakage damage during the assembly of the electrolytic cell. In addition, in order for the membrane electrode assembly to have sufficient support and sealing, a frame membrane needs to be bonded to the blank area around the CCM. Due to the swelling and wrinkling of the sheet-like CCM structure in the air, the frame membrane is prone to bubbles and wrinkles during the bonding process, resulting in poor sealing and other defects after the electrolytic cell is assembled, posing a safety hazard.

[0005] Therefore, developing a technology that can effectively solve the above problems and stably prepare membrane electrode assemblies with high flatness and high uniformity has become an urgent need in the field of PEM water electrolysis for hydrogen production. Summary of the Invention

[0006] In view of the above-mentioned defects of the prior art, the purpose of the present invention is to provide a membrane electrode assembly for PEM water electrolysis and a preparation method thereof, so as to solve the problems of proton exchange membrane swelling and deformation, gas diffusion layer misalignment damage, frame membrane bonding defects and low production efficiency, and realize efficient, stable and continuous production of membrane electrode assemblies.

[0007] To achieve the above objectives, the present invention provides a membrane electrode assembly for PEM water electrolysis, comprising: a cathode catalyst layer, an anode catalyst layer, a cathode gas diffusion layer, an anode gas diffusion layer, a frame membrane, and an adhesive layer; the cathode catalyst layer and the anode catalyst layer are respectively disposed on both sides of the proton exchange membrane, the cathode gas diffusion layer and the anode gas diffusion layer respectively cover the sides of the cathode catalyst layer and the anode catalyst layer away from the proton exchange membrane, the frame membrane is disposed at the edge of the proton exchange membrane and surrounds the catalyst layer and the gas diffusion layer, and the adhesive layer comprises a UV-curable adhesive and a pressure-sensitive adhesive, the UV-curable adhesive is located between the edge of the catalyst layer and the gas diffusion layer and the frame membrane, and the pressure-sensitive adhesive is located on the side of the frame membrane away from the proton exchange membrane.

[0008] Preferably, the cathode catalyst is a Pt / C type catalyst with a particle size of 8-15 nm and a Pt content of 10-100%; the anode catalyst is any one of Ir black, IrO2, and RuO2 with a particle size of 3-8 nm.

[0009] Preferably, the anode gas diffusion layer is any one of titanium felt, porous titanium plate, or gradient titanium felt, with a porosity of 30-65% and a thickness of 0.2-0.8 mm; the cathode gas diffusion layer is any one of carbon cloth, carbon paper, or porous carbon plate, with a porosity of 40-80% and a thickness of 0.1-0.4 mm.

[0010] Preferably, the border film is any one of PEN, PI, and PPS, and has a thickness of 50-150 μm.

[0011] Preferably, the curing time of the UV-curable adhesive is 20-40 seconds, and the curing pressure of the pressure-sensitive adhesive is 0.2-0.5 MPa.

[0012] Another aspect of the present invention provides a method for preparing a membrane electrode assembly for PEM water electrolysis, comprising the following steps:

[0013] (1) Preparation of anode catalyst slurry and cathode catalyst slurry;

[0014] (2) The roll-up proton exchange membrane is mounted on a coating equipment, and the anode catalyst slurry is coated onto the proton exchange membrane using intermittent coating. After drying, an anode catalyst layer is formed.

[0015] (3) Cut the roll edge film into a structure with a hollow center, and the hollow area is the same size as the anode gas diffusion layer;

[0016] (4) Spray UV-curable adhesive at the edge of the anode catalyst layer to form an adhesive ring, and attach it to the anode gas diffusion layer so that the four sides of the gas diffusion layer are pressed against the inner edge of the adhesive ring.

[0017] (5) The frame film from step (3) is attached to the remaining part of the UV-cured adhesive ring, and a half-film electrode assembly with a frame film is obtained by UV curing.

[0018] (6) Spray pressure-sensitive adhesive onto the border film area;

[0019] (7) Turn the product over and repeat steps (2)-(6) on the other side of the proton exchange membrane to prepare cathode-related components. After cutting, the membrane electrode assembly is obtained.

[0020] Preferably, in step (1), the composition of the anode catalyst slurry by mass ratio is:

[0021] Anode catalyst: Deionized water: Binder: Alcohol = 1:2-5:10-15:30-50;

[0022] The composition of the cathode catalyst slurry by mass ratio is as follows:

[0023] Cathode catalyst: Deionized water: Binder: Alcohol = 1:3-6:8-12:50-70;

[0024] The adhesive is a 5%-20% perfluorosulfonic acid resin solution; the alcohol is n-propanol or isopropanol.

[0025] Preferably, in step (2), the parameters of the intermittent coating are: coating speed 1-5m / min, coating thickness 400-800μm, and drying temperature 70-90℃.

[0026] Preferably, in step (4), the spraying parameters of the UV curing adhesive are: flow rate 3-6 mL / min, width 50-100 mm, speed 50-200 mm / s, and the spraying area surrounds the anode catalyst layer; the four sides of the anode gas diffusion layer are pressed into the adhesive ring for 3-5 mm of width; in step (5), the frame film is attached to the remaining 45-97 mm area of ​​the adhesive ring, and the UV curing time is 30-60 s.

[0027] Preferably, in step (6), the spraying parameters of the pressure-sensitive adhesive are: flow rate 3-6 mL / min, width 50-100 mm, and speed 50-200 mm / s.

[0028] Preferably, in step (3), the middle part of the frame film is automatically cleaned by a roller die after cutting.

[0029] Finally, this invention provides a system for preparing membrane electrode assemblies for PEM water electrolysis, characterized in that it comprises:

[0030] The unit includes a slurry preparation unit, a coating and drying unit, a frame film cutting unit, a UV adhesive spraying unit, a gas diffusion layer lamination unit, a UV curing unit, a pressure-sensitive adhesive spraying unit, and a slitting unit.

[0031] The slurry preparation unit is used to prepare anode catalyst slurry and cathode catalyst slurry;

[0032] The coating and drying unit is used to intermittently coat the catalyst slurry onto the rolled-up electron exchange membrane and dry it to form a catalyst layer.

[0033] The edge film cutting unit is used to cut the roll edge film into a hollow structure in the middle, and the hollow area is the same size as the gas diffusion layer.

[0034] The UV adhesive spraying unit is used to spray UV-curable adhesive at the edge of the catalyst layer to form an adhesive ring;

[0035] The gas diffusion layer bonding unit is used to bond the gas diffusion layer to the inner edge of the UV-curable adhesive ring.

[0036] The UV curing unit is used to cure the UV-curable adhesive after the frame film is applied.

[0037] The pressure-sensitive adhesive spraying unit is used to spray pressure-sensitive adhesive onto the border film area;

[0038] The slitting unit is used to slit the finished product into sheets;

[0039] Each unit is connected sequentially along the production line to achieve continuous production.

[0040] Preferably, the coating and drying unit includes an unwinding mechanism, an intermittent coating mechanism, and a drying tunnel; the unwinding mechanism is used to carry the rolled ion exchange membrane, the intermittent coating mechanism has a coating speed of 1-5 m / min and a coating thickness of 400-800 μm, and the drying temperature of the drying tunnel is 70-90℃.

[0041] Preferably, the UV adhesive spraying unit includes a multi-nozzle assembly and a first control module. The first control module is used to adjust the spraying flow rate to 3-6 mL / min, the spraying width to 50-100 mm, and the spraying speed to 50-200 mm / s, and the spraying area surrounds the catalyst layer.

[0042] Preferably, the border film cutting unit includes a roller die and a blowing mechanism. The roller die is used to cut the border film, and the blowing mechanism is used to automatically remove the cut-out middle part.

[0043] Preferably, the pressure-sensitive adhesive spraying unit includes a multi-nozzle assembly and a second control module, the second control module being used to adjust the spraying flow rate to 3-6 mL / min, the spraying width to 50-100 mm, and the spraying speed to 50-200 mm / s.

[0044] Preferably, the curing time of the UV curing unit is adjustable, with an adjustment range of 30-60 seconds.

[0045] Compared with the prior art, the present invention has the following significant advantages:

[0046] 1. In the preparation of the membrane electrode assembly, the present invention sprays a layer of UV-curable adhesive around the catalyst layer while preparing the anode catalyst layer, and attaches the anode gas diffusion layer at the same time. On the one hand, the anode gas diffusion layer can just cover the anode catalyst layer, avoiding the risk of incomplete coverage and the gas diffusion layer falling off during assembly. On the other hand, since the area of ​​the UV-curable adhesive ring is large enough, the frame film can just fit around the UV-curable adhesive ring, providing good curing support for the proton exchange membrane and effectively reducing the risk of swelling and wrinkling of the membrane electrode assembly after cutting.

[0047] 2. In this invention, after the frame film is attached, a layer of pressure-sensitive adhesive is sprayed onto the surface of the frame film. This is mainly because during the assembly of the membrane electrode assembly into the electrolytic cell, the frame film and the bipolar plate come into contact. The pressure-sensitive adhesive present has a stronger and tighter contact with the bipolar plate during the pressing process of the electrolytic cell. Furthermore, due to the pressure, it has a better sealing effect, which can prevent risks such as hydrogen leakage during the actual operation of the electrolytic cell.

[0048] 3. In the preparation of the membrane electrode assembly, the present invention adopts a continuous preparation process, which not only solves the risks of traditional spraying and re-lamination, coating and re-lamination processes, such as unevenness caused by lamination misalignment and swelling, but also improves production efficiency and produces membrane electrode assemblies with high uniformity. In addition, in the preparation of the catalyst layer on the other side, the proton exchange membrane is supported by a frame membrane at the edge and by a gas diffusion layer in the middle, which has a good stretching effect on the proton exchange membrane and avoids the risk of swelling of the proton exchange membrane.

[0049] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0050] Figure 1 This is a schematic cross-sectional view of the membrane electrode assembly of the present invention;

[0051] Figure 2 This is a front structural schematic diagram of the membrane electrode assembly of the present invention;

[0052] Figure 3 This is a process flow diagram of the preparation method of the present invention.

[0053] In the diagram: 1. Proton exchange membrane; 2. Catalyst layer; 2-1. Anode catalyst layer; 2-2. Cathode catalyst layer; 3. UV adhesive layer; 4. Gas diffusion layer; 4-1. Anode gas diffusion layer; 4-2. Cathode gas diffusion layer; 5. Frame membrane; 6. Pressure-sensitive adhesive. Detailed Implementation

[0054] The following description, with reference to the accompanying drawings, illustrates several preferred embodiments of the present invention to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0055] In the accompanying drawings, components with the same structure are indicated by the same numerical designation, and components with similar structures or functions are indicated by similar numerical designations. The dimensions and thicknesses of each component shown in the drawings are arbitrary, and the present invention does not limit the dimensions and thicknesses of each component. To make the illustrations clearer, the thickness of some components has been appropriately exaggerated in the drawings.

[0056] like Figure 1 and Figure 2 As shown, this embodiment provides a membrane electrode assembly for PEM water electrolysis, including: a cathode catalyst layer, an anode catalyst layer, a cathode gas diffusion layer, an anode gas diffusion layer, a frame membrane, and an adhesive layer; wherein:

[0057] The cathode catalyst layer and the anode catalyst layer are respectively disposed on both sides of the proton exchange membrane;

[0058] The cathode gas diffusion layer and the anode gas diffusion layer respectively cover the side of the cathode catalyst layer and the anode catalyst layer away from the proton exchange membrane;

[0059] The border membrane is disposed at the edge of the proton exchange membrane and surrounds the catalyst layer and the gas diffusion layer;

[0060] The adhesive layer includes a UV-curable adhesive and a pressure-sensitive adhesive. The UV-curable adhesive is located between the edge of the catalyst layer and the gas diffusion layer and the frame membrane, while the pressure-sensitive adhesive is located on the side of the frame membrane away from the proton exchange membrane.

[0061] The preferred parameters and materials for each part of the membrane electrode assembly for PEM water electrolysis in this embodiment are described below:

[0062] 1. Catalyst layer

[0063] 1.1 Cathode Catalyst

[0064] The cathode catalyst is a Pt / C type catalyst with a particle size of 8-15 nm and a Pt content of 10-100%. This range was chosen because Pt / C catalysts have excellent hydrogen evolution activity, and the 8-15 nm particle size can balance catalytic activity and precious metal utilization (too small a particle size easily leads to agglomeration, while too large a particle size reduces the specific surface area); the Pt content of 10-100% can be flexibly adjusted according to the cost and performance requirements of the application scenario (high Pt content is suitable for high current density scenarios, while low Pt content can reduce costs).

[0065] Hydrogen Evolution at the Cathode (HER): Pt is the most active catalyst for HER. Pt / C dispersion of Pt particles via a carbon support can reduce the amount of Pt required. Particle size design of 8-15 nm: Pt particles smaller than 8 nm tend to agglomerate, reducing active sites; larger than 15 nm, the specific surface area decreases, leading to decreased activity. An adjustable Pt content range of 10-100% can meet the needs of different scenarios (e.g., 10% Pt / C is suitable for low-cost scenarios, while 100% Pt is suitable for high current density scenarios).

[0066] 1.2 Anode Catalyst

[0067] The anode catalyst uses any one of Ir black, IrO2, or RuO2, with a particle size of 3-8 nm. Since the oxygen evolution reaction occurs at the anode, it needs to withstand a strong oxidizing environment. Ir and Ru-based oxides possess excellent antioxidant properties and oxygen evolution activity; a particle size of 3-8 nm ensures high catalytic activity (large specific surface area) while avoiding agglomeration problems caused by excessively small particle size.

[0068] Oxygen Evolution Reaction (OER): OER kinetics are slow and require resistance to strong oxidizing environments. Ir black, IrO2, and RuO2 are currently the most effective OER catalysts. Particle size design of 3-8 nm: Smaller particle sizes can provide more active sites, but particles smaller than 3 nm are prone to agglomeration due to excessively high surface energy; particles larger than 8 nm have insufficient activity.

[0069] 2 Gas diffusion layer

[0070] 2.1 Anode Gas Diffusion Layer

[0071] The anode gas diffusion layer is made of any one of titanium felt, porous titanium plate, or gradient titanium felt, with a porosity of 30-65% and a thickness of 0.2-0.8 mm. The anode is located in an acidic, strongly oxidizing environment, and titanium-based materials exhibit excellent corrosion resistance; the 30-65% porosity ensures efficient oxygen and water transport, and the 0.2-0.8 mm thickness balances mechanical strength and gas diffusion resistance.

[0072] Titanium-based materials (titanium felt, porous titanium plates, etc.) exhibit excellent stability in acidic and strongly oxidizing environments. Porosity: 30-65%; below 30%, oxygen and water transport is hindered; above 65%, mechanical strength is insufficient. Thickness: 0.2-0.8mm; too thin (<0.2mm) is easily oxidized and corroded, while too thick (>0.8mm) increases gas diffusion resistance.

[0073] 2.2 Cathode Gas Diffusion Layer

[0074] The cathode gas diffusion layer is made of any one of carbon cloth, carbon paper, or porous carbon plate, with a porosity of 40-80% and a thickness of 0.1-0.4 mm. The cathode undergoes the hydrogen evolution reaction; carbon-based materials offer excellent conductivity and are relatively inexpensive. The high porosity of 40-80% facilitates hydrogen escape, and the thinner thickness (0.1-0.4 mm) reduces ohmic losses.

[0075] Carbon-based materials (carbon cloth, carbon paper, etc.) have excellent electrical conductivity and low cost. Porosity 40-80%: higher than the anode, facilitating rapid hydrogen escape (hydrogen solubility is low, requiring higher porosity to reduce diffusion resistance). Thickness 0.1-0.4mm: thinner thickness can reduce ohmic losses (the resistance to hydrogen evolution reaction at the cathode is lower, further reducing ohmic losses is necessary).

[0076] 3-border membrane

[0077] The border membrane is made of any one of PEN (polyethylene naphthalate), PI (polyimide), or PPS (polyphenylene sulfide), with a thickness of 50-150 μm. These materials have excellent chemical resistance, high temperature resistance, and mechanical strength, effectively supporting the proton exchange membrane and preventing edge leakage; the 50-150 μm thickness balances the requirements for support and lightweight components.

[0078] 4 adhesive layers

[0079] 4.1 UV-curable adhesive

[0080] The UV-curable adhesive has a curing time of 20-40 seconds, which allows for rapid curing to enable continuous production. At the same time, it ensures a strong bond with the catalyst layer, gas diffusion layer and frame film, preventing component delamination.

[0081] The UV-curable adhesive cures rapidly (20-40 seconds) to suit continuous production. The adhesive ring formed at the edge of the catalyst layer simultaneously performs three functions: ① positioning the gas diffusion layer (preventing misalignment); ② bonding the frame membrane (ensuring sealing); ③ curing and supporting the proton exchange membrane (inhibiting swelling). The 50-100mm width design of the adhesive ring includes an inner 3-5mm for fixing the gas diffusion layer and an outer 45-97mm for bonding the frame membrane, balancing positioning and support requirements.

[0082] 4.2 Pressure-sensitive adhesive

[0083] The pressure-sensitive adhesive has a curing pressure of 0.2-0.5 MPa, which allows it to fit tightly with the bipolar plate during electrolytic cell assembly, enhancing sealing and preventing hydrogen leakage.

[0084] Pressure-sensitive adhesive is applied to the surface of the frame membrane. Under the assembly pressure (0.2-0.5 MPa) of the electrolytic cell, it deforms, filling the microscopic gaps between the frame membrane and the bipolar plate, forming a secondary seal and significantly reducing the risk of hydrogen leakage. Its synergy with UV-curable adhesive achieves end-to-end protection of "positioning-bonding-sealing".

[0085] like Figure 3 As shown, this embodiment provides a method for preparing a membrane electrode assembly for PEM water electrolysis, using a continuous production line, including the following steps:

[0086] 1. Preparation of anode catalyst slurry and cathode catalyst slurry

[0087] Anode catalyst slurry by mass ratio:

[0088] Anode catalyst: Deionized water: Binder: Alcohol = 1:2-5:10-15:30-50;

[0089] Cathode catalyst slurry by mass ratio:

[0090] Cathode catalyst: Deionized water: Binder: Alcohol = 1:3-6:8-12:50-70;

[0091] The binder is a 5%-20% perfluorosulfonic acid resin solution (to enhance the adhesion between the catalyst layer and the proton exchange membrane and the proton conduction), and the alcohol is n-propanol or isopropanol (to adjust the viscosity of the slurry and improve the uniformity of coating).

[0092] 2. Coating the anode catalyst layer

[0093] The roll-up proton exchange membrane is mounted on a coating device, and the anode catalyst slurry is coated onto the proton exchange membrane using intermittent coating. The coating parameters are: speed 1-5 m / min, thickness 400-800 μm, and drying temperature 70-90℃ (to remove solvent while avoiding thermal damage to the proton exchange membrane). After drying, an anode catalyst layer is formed.

[0094] 3. Cut the frame film

[0095] The roll-to-edge film is cut into a hollowed-out structure, with the hollowed-out area being the same size as the anode gas diffusion layer. After cutting, the middle part is automatically cleaned by a roller die to ensure that the edges of the edge film are clean.

[0096] 4. Spray UV-curable adhesive and attach the anolyte gas diffusion layer.

[0097] A UV-curable adhesive ring is formed by spraying UV-curable adhesive around the edge of the anode catalyst layer. Spraying parameters: flow rate 3-6 mL / min, width 50-100 mm, speed 50-200 mm / s. The spraying area surrounds the anode catalyst layer.

[0098] The anode gas diffusion layer is bonded together, with its four sides pressed against the inner edge of the rubber ring (pressing width 3-5mm), ensuring precise alignment between the gas diffusion layer and the catalyst layer.

[0099] 5. Apply the frame film and UV cure.

[0100] The frame film from step 3 is attached to the remaining portion (45-97mm area) of the UV-cured adhesive ring, and then UV-cured (30-60s) to obtain a half-film electrode assembly with a frame film.

[0101] 6. Spray pressure-sensitive adhesive

[0102] Pressure-sensitive adhesive is sprayed onto the edge membrane area. Spraying parameters: flow rate 3-6 mL / min, width 50-100 mm, speed 50-200 mm / s, to prepare for subsequent sealing with the bipolar plate.

[0103] 7. Prepare and cut cathode-related components.

[0104] Turn the product over and repeat steps 2-6 on the other side of the proton exchange membrane to prepare the cathode catalyst layer, cathode gas diffusion layer, frame membrane and adhesive layer. After slitting, the membrane electrode assembly is obtained.

[0105] This embodiment also provides a system for preparing membrane electrode assemblies for PEM water electrolysis. The system includes the following units connected sequentially along a production line to achieve continuous preparation:

[0106] Slurry preparation unit: used to prepare anode and cathode catalyst slurries, equipped with stirring and dispersing equipment to ensure slurry uniformity.

[0107] Coating and drying unit: including unwinding mechanism (carrying the roll of ion exchange membrane), intermittent coating mechanism (coating speed 1-5m / min, thickness 400-800μm) and drying tunnel (drying temperature 70-90℃).

[0108] The frame film cutting unit includes a roller die (for cutting the central hollow structure) and a blowing mechanism (for automatically removing the central part after cutting).

[0109] UV adhesive spraying unit: includes a multi-nozzle assembly and a first control module, which adjusts the spraying flow rate to 3-6 mL / min, the width to 50-100 mm, and the speed to 50-200 mm / s, with the spraying area surrounding the catalyst layer.

[0110] Gas diffusion layer bonding unit: Precisely bond the gas diffusion layer to the inner edge of the UV-curable adhesive ring.

[0111] UV curing unit: Curing time is adjustable (30-60s), which cures the UV-curable adhesive after the frame film is attached.

[0112] Pressure-sensitive adhesive spraying unit: includes a multi-nozzle assembly and a second control module, with adjustment parameters the same as those of the UV adhesive spraying unit.

[0113] Slitting unit: Slitting the finished product into sheets to obtain membrane electrode assemblies of the required size.

[0114] The present invention will be described in detail below through specific embodiments and comparative examples, but its protection scope is not limited to the embodiments described.

[0115] Example 1

[0116] (1) Weigh 20g of 3nm iridium black catalyst, add 40g of deionized water, 300g of 5% perfluorosulfonic acid resin solution and 600g of isopropanol, stir and disperse evenly to obtain anode catalyst slurry for later use.

[0117] (2) Weigh 50g of 15nm 10% Pt / C catalyst, add 300g of deionized water, 600g of 5% perfluorosulfonic acid resin solution and 2500g of isopropanol, stir and disperse evenly to obtain cathode catalyst slurry for later use.

[0118] (3) The roll-up proton exchange membrane is mounted on a coating equipment and an intermittent coating method is adopted. The coating speed is 1m / min and the coating thickness is 400nm. The anode catalyst slurry prepared in step (1) is coated on the proton exchange membrane and dried in an oven at 70°C to form an anode catalyst layer.

[0119] (4) A 50μm thick roll PEN border film is mounted on the auxiliary equipment of the coating equipment and cut by a roller die to form a border film with a hollow center. The length and width of the hollow part are the same as the size of the anode gas diffusion layer.

[0120] (5) The proton exchange membrane containing the anode catalyst layer prepared in step (3) is sprayed through the first spraying area. The multi-nozzle spraying parameters are set to 3 mL / min, the spraying speed is 50 mm / s, and the spraying width is set to 50 mm. The UV curing adhesive is sprayed on the edge of the anode catalyst layer to form a UV curing adhesive ring with a width of 50 mm. Then, a titanium felt with a thickness of 0.2 mm and a porosity of 30% is attached. The four sides of the titanium felt are just attached to the UV curing adhesive ring within 3 mm to obtain a semi-finished product with an anode gas diffusion layer.

[0121] (6) Attach the hollowed-out frame film obtained in step (4) to the remaining part of the UV curing ring of the semi-finished product prepared in step (5), so that the frame film and the remaining 47mm wide UV ring are completely bonded together, and the half-film electrode assembly with frame film is obtained after curing in the UV curing channel for 30s.

[0122] (7) Using a multi-nozzle collaborative spraying method, the spraying parameters are set as follows: spraying flow rate 3 mL / min, spraying width 50 mm, and spraying speed 50 mm / s. A layer of pressure-sensitive adhesive is sprayed above the frame membrane area of ​​the semi-membrane electrode assembly prepared in step (6) for later use.

[0123] (8) Turn the product prepared in step (7) over and repeat steps (2) to (7) on the other side of the proton exchange membrane to prepare cathode-related components. Then, the membrane electrode assembly is obtained by cutting the sheet.

[0124] Example 2

[0125] (1) Weigh 20g of 8nm IrO2 catalyst, add 100g of deionized water, 200g of 20% perfluorosulfonic acid resin solution and 1000g of n-propanol, stir and disperse evenly to obtain anode catalyst slurry for later use.

[0126] (2) Weigh 50g of 100% Pt catalyst with 8nm, add 150g of deionized water, 400g of 20% perfluorosulfonic acid resin solution and 3500g of n-propanol, stir and disperse evenly to obtain cathode catalyst slurry for later use.

[0127] (3) The roll-up proton exchange membrane is mounted on a coating equipment and an intermittent coating method is adopted. The coating speed is 5m / min and the coating thickness is 800nm. The anode catalyst slurry prepared in step (1) is coated on the proton exchange membrane and dried in an oven at 90°C to form an anode catalyst layer.

[0128] (4) A 150μm thick roll PPS border film is mounted on the auxiliary equipment of the coating equipment and cut by a roller die to form a border film with a hollow center. The length and width of the hollow part are the same as the size of the anode gas diffusion layer.

[0129] (5) The proton exchange membrane containing the anode catalyst layer prepared in step (3) is sprayed through the first spraying area. The multi-nozzle spraying parameters are set to 6 mL / min, the spraying speed is 200 mm / s, and the spraying width is set to 100 mm. The UV curing adhesive is sprayed on the edge of the anode catalyst layer to form a UV curing adhesive ring with a width of 100 mm. Then, a gradient titanium felt with a thickness of 0.8 mm and a porosity of 65% is attached. The four sides of the gradient titanium felt are just attached to the UV curing adhesive ring within 5 mm to obtain a semi-finished product with an anode gas diffusion layer.

[0130] (6) Attach the hollowed-out frame film obtained in step (4) to the remaining part of the UV curing ring of the semi-finished product prepared in step (5), so that the frame film and the remaining 95mm wide ring of the UV curing ring are completely bonded together, and the half-film electrode assembly with the frame film is obtained after curing in the UV curing channel for 60s.

[0131] (7) Using a multi-nozzle collaborative spraying method, the spraying parameters are set as follows: spraying flow rate 6 mL / min, spraying width 100 mm, and spraying speed 200 mm / s. A layer of pressure-sensitive adhesive is sprayed on the edge membrane area of ​​the half-film electrode assembly prepared in step (6) for later use.

[0132] (8) Turn the product prepared in step (7) over and repeat steps (2) to (7) on the other side of the proton exchange membrane to prepare cathode-related components. Then, the membrane electrode assembly is obtained by cutting the sheet.

[0133] Example 3:

[0134] (1) Weigh 20g of 5nm RuO2 catalyst, add 70g of deionized water, 240g of 10% perfluorosulfonic acid resin solution and 800g of isopropanol, stir and disperse evenly to obtain anode catalyst slurry for later use.

[0135] (2) Weigh 50g of 12nm 50% Pt / C catalyst, add 250g of deionized water, 500g of 10% perfluorosulfonic acid resin solution and 3000g of isopropanol, stir and disperse evenly to obtain cathode catalyst slurry for later use.

[0136] (3) The roll-up proton exchange membrane is mounted on a coating equipment and an intermittent coating method is adopted. The coating speed is 3m / min and the coating thickness is 600nm. The anode catalyst slurry prepared in step (1) is coated on the proton exchange membrane and dried in an oven at 80°C to form an anode catalyst layer.

[0137] (4) A 100μm thick roll PI border film is mounted on the auxiliary equipment of the coating equipment and cut by a roller die to form a border film with a hollow center. The length and width of the hollow part are the same as the size of the anode gas diffusion layer.

[0138] (5) The proton exchange membrane containing the anode catalyst layer prepared in step (3) is sprayed through the first spraying area. The multi-nozzle spraying parameters are set to 4.5 mL / min, the spraying speed is 100 mm / s, and the spraying width is set to 80 mm. The UV curing adhesive is sprayed on the edge of the anode catalyst layer to form a UV curing adhesive ring with a width of 80 mm. Then, a porous titanium plate with a thickness of 0.4 mm and a porosity of 40% is attached. The four sides of the titanium plate are just attached to the UV curing adhesive ring for 4 mm to obtain a semi-finished product with an anode gas diffusion layer.

[0139] (6) Attach the hollowed-out frame film obtained in step (4) to the remaining part of the UV curing ring of the semi-finished product prepared in step (5), so that the frame film and the remaining 76mm wide UV ring are completely bonded together, and the half-film electrode assembly with frame film is obtained after curing in the UV curing channel for 45s.

[0140] (7) Using a multi-nozzle collaborative spraying method, the spraying parameters are set as follows: spraying flow rate 4.5 mL / min, spraying width 80 mm, and spraying speed 100 mm / s. A layer of pressure-sensitive adhesive is sprayed above the frame membrane area of ​​the semi-membrane electrode assembly prepared in step (6) for later use.

[0141] (8) Turn the product prepared in step (7) over and repeat steps (2) to (7) on the other side of the proton exchange membrane to prepare cathode-related components. Then, the membrane electrode assembly is obtained by cutting the sheet.

[0142] Comparative Example 1 (without UV adhesive)

[0143] (1) Weigh 20g of 3nm iridium black catalyst, add 40g of deionized water, 300g of 5% perfluorosulfonic acid resin solution and 600g of isopropanol, stir and disperse evenly to obtain anode catalyst slurry for later use.

[0144] (2) Weigh 50g of 15nm 10% Pt / C catalyst, add 300g of deionized water, 600g of 5% perfluorosulfonic acid resin solution and 2500g of isopropanol, stir and disperse evenly to obtain cathode catalyst slurry for later use.

[0145] (3) The roll-up proton exchange membrane is mounted on a coating equipment and an intermittent coating method is adopted. The coating speed is 1m / min and the coating thickness is 400nm. The anode catalyst slurry prepared in step (1) is coated on the proton exchange membrane and dried in an oven at 70°C to form an anode catalyst layer.

[0146] (4) A 50μm thick roll PEN border film is mounted on the auxiliary equipment of the coating equipment and cut by a roller die to form a border film with a hollow center. The length and width of the hollow part are the same as the size of the anode gas diffusion layer.

[0147] (5) A titanium felt with a thickness of 0.2 mm and a porosity of 30% is attached to the surface of the proton exchange membrane containing the anode catalyst layer prepared in step (3) to obtain a semi-finished product with an anode gas diffusion layer;

[0148] (6) Attach the hollowed-out frame film obtained in step (4) around the semi-finished product prepared in step (5) so that the frame film just covers the part of the film outside the anode gas diffusion layer, and obtain a semi-film electrode assembly.

[0149] (7) Using a multi-nozzle collaborative spraying method, the spraying parameters are set as follows: spraying flow rate 3 mL / min, spraying width 50 mm, and spraying speed 50 mm / s. A layer of pressure-sensitive adhesive is sprayed above the frame membrane area of ​​the semi-membrane electrode assembly prepared in step (6) for later use.

[0150] (8) Turn the product prepared in step (7) over and repeat steps (2) to (7) on the other side of the proton exchange membrane to prepare cathode-related components. Then, the membrane electrode assembly is obtained by cutting the sheet.

[0151] Comparative Example 2 (without frame film)

[0152] (1) Weigh 20g of 3nm iridium black catalyst, add 40g of deionized water, 300g of 5% perfluorosulfonic acid resin solution and 600g of isopropanol, stir and disperse evenly to obtain anode catalyst slurry for later use.

[0153] (2) Weigh 50g of 15nm 10% Pt / C catalyst, add 300g of deionized water, 600g of 5% perfluorosulfonic acid resin solution and 2500g of isopropanol, stir and disperse evenly to obtain cathode catalyst slurry for later use.

[0154] (3) The roll-up proton exchange membrane is mounted on a coating equipment and an intermittent coating method is adopted. The coating speed is 1m / min and the coating thickness is 400nm. The anode catalyst slurry prepared in step (1) is coated on the proton exchange membrane and dried in an oven at 70°C to form an anode catalyst layer.

[0155] (4) The proton exchange membrane containing the anode catalyst layer prepared in step (3) passes through the first spraying area. The multi-nozzle spraying parameters are set to 3 mL / min, the spraying speed is 50 mm / s, and the spraying width is 50 mm. The UV curing adhesive is sprayed onto the proton exchange membrane at the edge of the anode catalyst layer to form a UV curing adhesive ring with a width of 50 mm. Then, a titanium felt with a thickness of 0.2 mm and a porosity of 30% is attached. The four sides of the titanium felt are just attached to the UV curing adhesive ring within 3 mm to obtain a semi-finished product with an anode gas diffusion layer.

[0156] (5) Using a multi-nozzle collaborative spraying method, the spraying parameters are set as follows: spraying flow rate 3 mL / min, spraying width 50 mm, and spraying speed 50 mm / s. A layer of pressure-sensitive adhesive is sprayed above the area around the anode gas diffusion layer of the semi-film electrode assembly prepared in step (4) for later use.

[0157] (6) Turn the product prepared in step (5) over and repeat steps (2) to (5) on the other side of the proton exchange membrane to prepare cathode-related components. Then, the membrane electrode assembly is obtained by cutting the sheet.

[0158] Comparative Example 3 (without pressure-sensitive adhesive sprayed)

[0159] (1) Weigh 20g of 3nm iridium black catalyst, add 40g of deionized water, 300g of 5% perfluorosulfonic acid resin solution and 600g of isopropanol, stir and disperse evenly to obtain anode catalyst slurry for later use.

[0160] (2) Weigh 50g of 15nm 10% Pt / C catalyst, add 300g of deionized water, 600g of 5% perfluorosulfonic acid resin solution and 2500g of isopropanol, stir and disperse evenly to obtain cathode catalyst slurry for later use.

[0161] (3) The roll-up proton exchange membrane is mounted on a coating equipment and an intermittent coating method is adopted. The coating speed is 1m / min and the coating thickness is 400nm. The anode catalyst slurry prepared in step (1) is coated on the proton exchange membrane and dried in an oven at 70°C to form an anode catalyst layer.

[0162] (4) A 50μm thick roll PEN border film is mounted on the auxiliary equipment of the coating equipment and cut by a roller die to form a border film with a hollow center. The length and width of the hollow part are the same as the size of the anode gas diffusion layer.

[0163] (5) The proton exchange membrane containing the anode catalyst layer prepared in step (3) is sprayed through the first spraying area. The multi-nozzle spraying parameters are set to 3 mL / min, the spraying speed is 50 mm / s, and the spraying width is set to 50 mm. The UV curing adhesive is sprayed on the edge of the anode catalyst layer to form a UV curing adhesive ring with a width of 50 mm. Then, a titanium felt with a thickness of 0.2 mm and a porosity of 30% is attached. The four sides of the titanium felt are just attached to the UV curing adhesive ring within 3 mm to obtain a semi-finished product with an anode gas diffusion layer.

[0164] (6) Attach the hollowed-out frame film obtained in step (4) to the remaining part of the UV curing ring of the semi-finished product prepared in step (5), so that the frame film and the remaining 47mm wide UV ring are completely bonded together, and the half-film electrode assembly with frame film is obtained after curing in the UV curing channel for 30s.

[0165] (7) Turn the product prepared in step (6) over and repeat steps (2) to (6) on the other side of the proton exchange membrane to prepare cathode-related components. Then, the membrane electrode assembly is obtained by cutting the sheet.

[0166] Comparative Example 4 (without diffusion layer)

[0167] (1) Weigh 20g of 3nm iridium black catalyst, add 40g of deionized water, 300g of 5% perfluorosulfonic acid resin solution and 600g of isopropanol, stir and disperse evenly to obtain anode catalyst slurry for later use.

[0168] (2) Weigh 50g of 15nm 10% Pt / C catalyst, add 300g of deionized water, 600g of 5% perfluorosulfonic acid resin solution and 2500g of isopropanol, stir and disperse evenly to obtain cathode catalyst slurry for later use.

[0169] (3) The roll-up proton exchange membrane is mounted on a coating equipment and an intermittent coating method is adopted. The coating speed is 1m / min and the coating thickness is 400nm. The anode catalyst slurry prepared in step (1) is coated on the proton exchange membrane and dried in an oven at 70°C to form an anode catalyst layer.

[0170] (4) A 50μm thick roll PEN border film is mounted on the auxiliary equipment of the coating equipment and cut by a roller die to form a border film with a hollow center. The length and width of the hollow part are the same as the size of the anode gas diffusion layer.

[0171] (5) The proton exchange membrane containing the anode catalyst layer prepared in step (3) passes through the first spraying area. The multi-nozzle spraying parameters are set to 3 mL / min, the spraying speed is 50 mm / s, and the spraying width is set to 50 mm. The UV curing adhesive is sprayed on the edge of the anode catalyst layer to form a UV curing adhesive ring with a width of 50 mm.

[0172] (6) Attach the hollowed-out frame film obtained in step (4) to the area of ​​the UV curing ring of the semi-finished product prepared in step (5), so that the frame film and the remaining 50mm wide ring of the UV curing ring are completely bonded together, and the half-film electrode assembly with the frame film is obtained after curing for 30s through the UV curing channel.

[0173] (7) Using a multi-nozzle collaborative spraying method, the spraying parameters are set as follows: spraying flow rate 3 mL / min, spraying width 50 mm, and spraying speed 50 mm / s. A layer of pressure-sensitive adhesive is sprayed above the frame membrane area of ​​the semi-membrane electrode assembly prepared in step (6) for later use.

[0174] (8) Turn the product prepared in step (7) over and repeat steps (2) to (7) on the other side of the proton exchange membrane to prepare cathode-related components. Then, the membrane electrode assembly is obtained by cutting the sheet.

[0175] The membrane electrode assembly prepared in this invention was tested to verify its operational performance, its operational capability after assembly into an electrolyzer, and the extent of hydrogen leakage. The effective catalyst layer area of ​​the prepared membrane electrode assembly was selected to be 50*60 cm, and the noble metal loading of the prepared membrane electrode was 0.4 mg Pt / cm³ at the cathode. 2 Precious metals, anode 1.0 mgIr / cm 2Five membrane electrode assemblies from each sample were assembled into an electrolytic cell for testing. In the comparative example, the membrane electrode assembly without a gas diffusion layer was manually stacked during the actual assembly process to form a complete electrolytic cell. The test conditions were: water temperature 60℃, flow rate 40000 mL / min, and rated current density 1.0 A / cm³. 2 Stable operation test.

[0176] Table 1 Test Results

[0177] Example <![CDATA[Energy consumption (kW·h / Nm 3 H2)]]> Average voltage (V) Hydrogen leak (ppm) Example 1 4.05 1.695 3 Example 2 4.09 1.712 2 Example 3 4.07 1.701 5 Comparative Example 1 4.11 1.721 50 Comparative Example 2 4.14 1.731 250 Comparative Example 3 4.07 1.713 430 Comparative Example 4 4.17 1.743 360

[0178] As shown in Table 1, the prepared electrolyzers operated stably under the same current density during actual operation. The use of UV-curable adhesive and pressure-sensitive adhesive in the preparation of the membrane electrode assembly resulted in stable performance, low energy consumption, and minimal hydrogen leakage, which is considered normal. In Comparative Example 1, the voltage increased due to the absence of UV-curable adhesive, caused by the lack of significant bonding support between the proton exchange membrane and the frame membrane, leading to proton exchange membrane swelling and a significant increase in hydrogen leakage. In Comparative Example 2, the absence of a frame membrane resulted in lower edge strength of the prepared membrane electrode assembly during actual assembly, and the swelling of the proton exchange membrane further increased resistance, leading to a substantial increase in hydrogen leakage. In Comparative Example 3, the absence of pressure-sensitive adhesive did not significantly alter the performance, but the lack of adhesive sealing between the membrane electrode assembly and other components such as bipolar plates resulted in the largest hydrogen leakage. In Comparative Example 4, the absence of a gas diffusion layer during membrane electrode assembly meant that the gas diffusion layer needed to be re-stacked during electrolyzer assembly, potentially leading to misalignment and other defects, resulting in a significant voltage increase and substantial hydrogen leakage.

[0179] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A membrane electrode assembly for PEM water electrolysis, characterized in that, include: The membrane comprises a cathode catalyst layer, an anode catalyst layer, a cathode gas diffusion layer, an anode gas diffusion layer, a frame membrane, and an adhesive layer. The cathode catalyst layer and the anode catalyst layer are respectively disposed on opposite sides of the proton exchange membrane. The cathode gas diffusion layer and the anode gas diffusion layer respectively cover the sides of the cathode catalyst layer and the anode catalyst layer away from the proton exchange membrane. The frame membrane is disposed at the edge of the proton exchange membrane and surrounds the catalyst layer and the gas diffusion layer. The adhesive layer includes a UV-curable adhesive and a pressure-sensitive adhesive. The UV-curable adhesive is located between the edge of the catalyst layer and the gas diffusion layer and the frame membrane. The pressure-sensitive adhesive is located on the side of the frame membrane away from the proton exchange membrane.

2. The membrane electrode assembly for PEM water electrolysis according to claim 1, characterized in that, The cathode catalyst is a Pt / C type catalyst with a particle size of 8-15 nm and a Pt content of 10-100%; the anode catalyst is any one of Ir black, IrO2, and RuO2 with a particle size of 3-8 nm.

3. The membrane electrode assembly for PEM water electrolysis according to claim 1, characterized in that, The anode gas diffusion layer is any one of titanium felt, porous titanium plate, or gradient titanium felt, with a porosity of 30-65% and a thickness of 0.2-0.8 mm; the cathode gas diffusion layer is any one of carbon cloth, carbon paper, or porous carbon plate, with a porosity of 40-80% and a thickness of 0.1-0.4 mm.

4. The membrane electrode assembly for PEM water electrolysis according to claim 1, characterized in that, The border film is any one of PEN, PI, and PPS, with a thickness of 50-150 μm.

5. The membrane electrode assembly for PEM water electrolysis according to claim 1, characterized in that, The curing time of the UV-curable adhesive is 20-40 seconds, and the curing pressure of the pressure-sensitive adhesive is 0.2-0.5 MPa.

6. A method for preparing a membrane electrode assembly for PEM water electrolysis, characterized in that, Includes the following steps: (1) Preparation of anode catalyst slurry and cathode catalyst slurry; (2) The roll-up proton exchange membrane is mounted on a coating equipment, and the anode catalyst slurry is coated onto the proton exchange membrane using intermittent coating. After drying, an anode catalyst layer is formed. (3) Cut the roll edge film into a structure with a hollowed-out center, with the hollowed-out area being the same size as the anode gas diffusion layer; (4) Spray UV-curable adhesive at the edge of the anode catalyst layer to form an adhesive ring, and attach it to the anode gas diffusion layer so that the four sides of the gas diffusion layer are pressed against the inner edge of the adhesive ring. (5) The frame film from step (3) is attached to the remaining part of the UV-cured adhesive ring, and a half-film electrode assembly with a frame film is obtained by UV curing. (6) Spray pressure-sensitive adhesive onto the border film area; (7) Turn the product over and repeat steps (2)-(6) on the other side of the proton exchange membrane to prepare cathode-related components. After cutting, the membrane electrode assembly is obtained.

7. The preparation method according to claim 6, characterized in that, In step (1), the composition of the anode catalyst slurry by mass ratio is as follows: Anode catalyst: Deionized water: Binder: Alcohol = 1:2-5:10-15:30-50; The composition of the cathode catalyst slurry by mass ratio is as follows: Cathode catalyst: Deionized water: Binder: Alcohol = 1:3-6:8-12:50-70; The adhesive is a 5%-20% perfluorosulfonic acid resin solution; the alcohol is n-propanol or isopropanol.

8. The preparation method according to claim 6, characterized in that, In step (2), the parameters for intermittent coating are: coating speed 1-5 m / min, coating thickness 400-800 μm, and drying temperature 70-90℃.

9. The preparation method according to claim 6, characterized in that, In step (4), the spraying parameters of the UV curing adhesive are: flow rate 3-6 mL / min, width 50-100 mm, speed 50-200 mm / s, and the spraying area surrounds the anode catalyst layer; the four sides of the anode gas diffusion layer are pressed into the adhesive ring for 3-5 mm of width; in step (5), the frame film is attached to the remaining 45-97 mm area of ​​the adhesive ring, and the UV curing time is 30-60 s.

10. The preparation method according to claim 6, characterized in that, In step (6), the spraying parameters of the pressure-sensitive adhesive are: flow rate 3-6 mL / min, width 50-100 mm, and speed 50-200 mm / s.

11. The preparation method according to claim 6, characterized in that, In step (3), the middle part of the frame film is automatically cleaned by a roller die after cutting.

12. A system for preparing a membrane electrode assembly for PEM water electrolysis, characterized in that, include: The unit includes a slurry preparation unit, a coating and drying unit, a frame film cutting unit, a UV adhesive spraying unit, a gas diffusion layer lamination unit, a UV curing unit, a pressure-sensitive adhesive spraying unit, and a slitting unit. The slurry preparation unit is used to prepare anode catalyst slurry and cathode catalyst slurry; The coating and drying unit is used to intermittently coat the catalyst slurry onto the rolled-up electron exchange membrane and dry it to form a catalyst layer. The edge film cutting unit is used to cut the roll edge film into a hollow structure in the middle, and the hollow area is the same size as the gas diffusion layer. The UV adhesive spraying unit is used to spray UV-curable adhesive at the edge of the catalyst layer to form an adhesive ring; The gas diffusion layer bonding unit is used to bond the gas diffusion layer to the inner edge of the UV-curable adhesive ring. The UV curing unit is used to cure the UV-curable adhesive after the frame film is applied. The pressure-sensitive adhesive spraying unit is used to spray pressure-sensitive adhesive onto the border film area; The slitting unit is used to slit the finished product into sheets; Each unit is connected sequentially along the production line to achieve continuous production.

13. The system for preparing a membrane electrode assembly for PEM water electrolysis according to claim 12, characterized in that, The coating and drying unit includes an unwinding mechanism, an intermittent coating mechanism, and a drying tunnel; the unwinding mechanism is used to carry the rolled molecule exchange membrane, the intermittent coating mechanism has a coating speed of 1-5 m / min and a coating thickness of 400-800 μm, and the drying temperature of the drying tunnel is 70-90℃.

14. The system for preparing a membrane electrode assembly for PEM water electrolysis according to claim 12, characterized in that, The UV adhesive spraying unit includes a multi-nozzle assembly and a first control module. The first control module is used to adjust the spraying flow rate to 3-6 mL / min, the spraying width to 50-100 mm, and the spraying speed to 50-200 mm / s, and the spraying area surrounds the catalyst layer.

15. The system for preparing a membrane electrode assembly for PEM water electrolysis according to claim 12, characterized in that, The border film cutting unit includes a roller die and a blowing mechanism. The roller die is used to cut the border film, and the blowing mechanism is used to automatically remove the cut-out middle part.

16. The system for preparing a membrane electrode assembly for PEM water electrolysis according to claim 12, characterized in that, The pressure-sensitive adhesive spraying unit includes a multi-nozzle assembly and a second control module. The second control module is used to adjust the spraying flow rate to 3-6 mL / min, the spraying width to 50-100 mm, and the spraying speed to 50-200 mm / s.

17. The system for preparing a membrane electrode assembly for PEM water electrolysis according to claim 12, characterized in that, The curing time of the UV curing unit is adjustable, with an adjustment range of 30-60 seconds.

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