CO2 corrosion resistant high-stability anion exchange membrane and preparation method thereof

Abstract

The invention discloses a CO2 corrosion resistant high-stability anion exchange membrane and a preparation method thereof, and belongs to the technical field of electrochemical materials. The anion exchange membrane comprises a surface compact layer and an inner support layer, the surface compact layer is a PAEN nanofiber layer, and phosphonate groups and a free radical scavenger are doped in the PAEN nanofiber layer; and the inner supporting layer is a porous PAEN base material. Through gradient pore structure design, phenothiazine free radical scavenger adding and a roll-to-roll continuous process, the technical effects that the membrane conductivity is larger than or equal to 80 mS / cm, the alkali-resistant life is larger than or equal to 3000 hours, and the CO2 permeability is smaller than or equal to 1 * 10 <-6 > cm < 3 > / cm < 2 >. S are achieved, the performance of an AEM electrolytic cell in a pure water environment is remarkably improved, the service life of the AEM electrolytic cell in the pure water environment is remarkably prolonged, and key material support is provided for large-scale production of green hydrogen.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electrochemical materials, and relates to a high-stability anion exchange membrane resistant to CO2 corrosion and a preparation method thereof. BACKGROUND

[0002] Under the background of energy transformation and sustainable development, hydrogen energy, as a clean, efficient and renewable energy carrier, is gradually becoming one of the core development directions in the energy field. Among them, the anion exchange membrane (AEM) water electrolysis hydrogen production technology has shown great application potential and broad market prospects due to its unique advantages, such as being able to operate in an alkaline environment, being able to use non-noble metal catalysts, and having low equipment corrosion.

[0003] In actual application, the existing anion exchange membrane faces many severe challenges, which seriously restricts its performance stability and service life. Specifically, in the long-term operation process, the anion exchange membrane is easily affected by the penetration of carbon dioxide (CO2) in the environment. When CO2 penetrates into the membrane, it will react with the basic groups in the membrane to generate carbonates or bicarbonates and other substances. The accumulation of these products will change the microstructure of the membrane, thereby causing the membrane resistance to increase significantly. At the same time, CO2 penetration will also damage the ion transport channels in the membrane, resulting in a significant decrease in ion conductivity. Ion conductivity is one of the key indicators for measuring the performance of anion exchange membranes, and its decrease will directly affect the working efficiency of the electrolytic cell and the hydrogen production capacity.

[0004] Therefore, the existing anion exchange membrane is easily affected by CO2 penetration in long-term operation, resulting in an increase in membrane resistance (>10% increase / 1000 hours) and a decrease in ion conductivity (<60 mS / cm), and insufficient alkali resistance (service life <2000 hours). The traditional preparation process has problems such as limited membrane width (<500 mm), high production cost (>300 US dollars / m 2 ) and the like, which restricts the large-scale application of AEM electrolytic cells.

[0005] In summary, it is urgent to develop a high-stability anion exchange membrane to significantly improve the alkali resistance, CO2 penetration resistance and production efficiency of the membrane, and reduce the manufacturing cost, which has important practical significance and strategic value for promoting the large-scale application of AEM electrolytic cells and promoting the development of hydrogen energy industry. SUMMARY

[0006] The purpose of the present application is to provide an anion exchange membrane resistant to CO2 corrosion and a preparation method thereof, to solve the technical problem of poor CO2 resistance of the anion exchange membrane in the prior art, which restricts the hydrogen production efficiency.

[0007] To achieve the above object, the application adopts the following technical solutions to achieve the above object:

[0008] In a first aspect, the application provides a high-stability anion exchange membrane resistant to CO2 corrosion, comprising a surface dense layer and an inner support layer; the surface dense layer is a PAEN nanofiber layer, and the PAEN nanofiber layer is doped with phosphonate groups and a free radical scavenger; and the inner support layer is a porous PAEN substrate.

[0009] Further, the fiber diameter of the PAEN nanofiber layer is 80 nm ± 10 nm, and the thickness is 5 μm ± 0.5 μm.

[0010] Further, the doping amount of the phosphonate groups is 0.5 mol%, and the free radical scavenger is a phenothiazine derivative with a doping amount of 0.8 wt%.

[0011] Further, the pore size of the porous PAEN substrate is 50 nm to 100 nm, the porosity is ≥ 70%, and the thickness is 20 μm ± 2 μm.

[0012] In a second aspect, the application provides a preparation method of the high-stability anion exchange membrane resistant to CO2 corrosion, comprising the following steps:

[0013] The PAEN resin is dissolved in an NMP solvent, and a phosphonate monomer is added to provide a surface fiber membrane prepared by an electrospinning process;

[0014] The surface fiber membrane is immersed in an ethanol solution of a phenothiazine derivative for a preset time, then dried, and then subjected to ultraviolet crosslinking to obtain a surface dense layer;

[0015] The PAEN resin solution is coated on a polyester base film, and a porous inner support layer is formed by a phase separation method;

[0016] The surface dense layer and the inner support layer are compounded and hot-pressed to prepare an anion exchange membrane.

[0017] Further, the concentration of the PAEN resin in the NMP solvent is 10 wt%, the voltage of the electrospinning process is 10 kV to 20 kV, the receiving distance is 15 cm to 20 cm, and the spinning time is 30 minutes to 50 minutes.

[0018] Further, the preset time is 30 minutes to 40 minutes, and the drying temperature is 55°C to 65°C.

[0019] Further, the ultraviolet crosslinking process is carried out in a nitrogen atmosphere, and a wavelength of 365 nm, an intensity of 50 mW / cm 2 of ultraviolet light is used.

[0020] Further, the concentration of the PAEN resin solution is 20wt%.

[0021] Further, the hot-pressing process adopts a roll-to-roll continuous production process, the hot-pressing temperature of the roll-to-roll continuous production process is 180℃±5℃, the pressure is 1.5MPa±0.2MPa, and the coating speed is 5m / min±0.2m / min.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] The application discloses a high-stability anion exchange membrane resistant to CO2 corrosion, which comprises a surface dense layer and an inner support layer; the surface dense layer is a PAEN nanofiber layer prepared by using an electrostatic spinning technology and is used for blocking CO2 permeation (permeation rate is less than or equal to 1*10 -6 cm 3 / cm 2 * s). The inner support layer is a porous PAEN substrate formed by using a phase separation method, and the ion conductivity is greater than or equal to 80 mS / cm (1M KOH, 60 DEG C). The surface dense layer is further doped with phosphonate groups, the alkali resistance is improved (lifetime is greater than or equal to 3000 hours in 80 DEG C, 1M KOH), and phenothiazine derivatives (C 12 H9NS) are added, OH free radicals are neutralized by an oxidation-reduction reaction (clearance efficiency is greater than or equal to 95%), and the anion exchange membrane has the advantages that in a pure water electrolysis environment (1A / cm 2 ), the electrolysis voltage is less than or equal to 1.8V, the hydrogen production energy consumption is less than or equal to 4.3kWh / Nm 3 H2. The CO2 resistance is also significantly improved, the conductivity retention rate is greater than or equal to 85% after 1000 hours of operation, and the membrane resistance growth rate is less than 5%.

[0024] The application discloses a preparation method of a high-stability anion exchange membrane resistant to CO2 corrosion. First, PAEN resin is dissolved in NMP solvent, and phosphonate monomers are added to prepare a surface fiber membrane by electrostatic spinning; then, the surface fiber membrane is immersed in an ethanol solution containing phenothiazine derivatives, and a surface dense layer is obtained by ultraviolet crosslinking in a nitrogen atmosphere; PAEN resin solution is coated on a polyester base film, and a porous inner support layer is formed by a phase separation method (water coagulation bath); finally, the surface dense layer and the inner support layer are compounded and hot-pressed to complete the preparation of the anion exchange membrane. The hot-pressing adopts a roll-to-roll process, and the membrane production cost is reduced to 150 dollars / m 2(50% lower than imported products), width ≥1000mm, suitable for megawatt electrolytic cell (such as Suqian green energy 1MW system). It has passed the test of 5MW green ammonia synthesis project, the continuous operation time of single membrane is >3000 hours, and the attenuation rate is <0.05% / 1000 hours. Through the gradient hole structure design, the addition of phenothiazine free radical scavenger, and the roll-to-roll continuous process, the technical effects of membrane conductivity ≥80mS / cm, alkali resistance life ≥3000 hours, CO2permeation rate ≤1×10 -6 cm 3 / cm 2 s are realized, which significantly improves the performance and life of AEM electrolytic cell in pure water environment, and provides key material support for large-scale production of green hydrogen. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0026] Figure 1 The flow chart of the preparation method of the high-stability anion exchange membrane against CO2 corrosion of the present application. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to understand the characteristics and effects of the present application, the following will specifically explain and define the terms and phrases mentioned in the specification and claims. Unless otherwise specified, all technical and scientific words used in the text are the usual meanings understood by those skilled in the art for the present application. In case of conflict, the definition in the specification shall prevail.

[0028] Theories or mechanisms described and disclosed herein, whether correct or not, should not limit the scope of the present application in any way, i.e., the content of the present application can be implemented without being limited by any particular theory or mechanism.

[0029] In this text, all features defined in the form of numerical range or percentage range, such as numerical value, quantity, content and concentration, are for the sake of brevity and convenience. Therefore, the description of numerical range or percentage range should be regarded as having covered and specifically disclosed all possible sub-ranges and individual numerical values (including integers and fractions) within the range.

[0030] In this article, unless otherwise specified, “contains,” “includes,” “containing,” “has,” or similar terms cover the meanings of “composed of” and “mainly composed of,” for example, “A contains a” covers the meanings of “A contains a and others” and “A contains only a.”

[0031] For the sake of brevity, not all possible combinations of the technical features in each implementation scheme or embodiment are described herein. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each implementation scheme or embodiment can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification.

[0032] The present invention will now be described in further detail with reference to the accompanying drawings:

[0033] This invention discloses a highly stable anion exchange membrane resistant to CO2 corrosion, comprising:

[0034] 1) Dense Surface Layer: A PAEN nanofiber layer prepared using electrospinning technology, with a fiber diameter of 80nm±10nm and a thickness of 5μm±0.5μm, is used to block CO2 permeation (permeability ≤1×10⁻⁶). -6 cm 3 / cm 2 The PAEN nanofiber layer is doped with phosphonate groups and a free radical scavenger; the phosphonate groups account for 0.5% of the molar percentage of the PAEN nanofiber layer; the free radical scavenger is a phenothiazine derivative, which accounts for 0.8% of the mass percentage of the PAEN nanofiber layer.

[0035] 2) Inner support layer: A porous PAEN substrate formed by phase separation method, with a pore size of 50nm~100nm, porosity ≥70%, thickness of 20μm±2μm, and ionic conductivity ≥80mS / cm (1MKOH, 60℃).

[0036] The PAEN nanofiber layer in this embodiment has been modified with antioxidant and free radical scavenging properties.

[0037] Substrate resin: Polyarylene ether nitrile (PAEN) resin (molecular weight 150,000 Da), doped with 0.5 mol% phosphonate groups to improve alkali resistance (life ≥ 3000 hours at 80℃ and 1 M KOH).

[0038] Free radical scavenger: Added 0.8 wt% phenothiazine derivative (C 12 H9NS) neutralizes OH free radicals through redox reactions (scavenging efficiency ≥95%).

[0039] The anion exchange membrane of the present invention operates in a pure water electrolysis environment (1 A / cm). 2Electrolysis voltage ≤ 1.8V, hydrogen production energy consumption ≤ 4.3kWh / Nm³ 3 H2. This anion exchange membrane effectively reduces energy loss during electrolysis, improves energy utilization efficiency, and makes hydrogen production more economical and energy-saving. CO2 tolerance is also significantly improved, with conductivity retention ≥85% and membrane resistance growth rate <5% after 1000 hours of operation. During long-term operation, its internal structure and chemical properties remain relatively stable, and it is not easily affected by factors such as CO2, thus extending the membrane's lifespan and reducing equipment maintenance and replacement costs.

[0040] See Figure 1 This invention discloses a method for preparing a highly stable anion exchange membrane resistant to CO2 corrosion, comprising the following steps:

[0041] S1, PAEN resin is dissolved in NMP solvent, phosphonate monomer is added, and electrospinning process is provided to prepare the surface fiber membrane;

[0042] In this step, the concentration of PAEN resin in NMP solvent is 10wt%; the voltage of the electrospinning process is 10kV to 20kV, the receiving distance is 15cm to 20cm, and the spinning time is 30 minutes to 50 minutes.

[0043] S2, the surface fiber membrane is immersed in an ethanol solution of phenothiazine derivative for a preset time and then dried, and then subjected to ultraviolet crosslinking to obtain a dense surface layer;

[0044] In this step, the preset time is 30 to 40 minutes; the drying temperature is 55°C to 65°C; the ultraviolet crosslinking process is carried out in a nitrogen atmosphere, using a wavelength of 365 nm and an intensity of 50 mW / cm. 2 Ultraviolet light.

[0045] S3, PAEN resin solution is coated onto polyester base film, and a porous inner support layer is formed by phase separation method;

[0046] In this step, the concentration of the PAEN resin solution is 20 wt%.

[0047] S4. The surface dense layer and the inner support layer are combined and hot-pressed to prepare an anion exchange membrane. The width of the finished membrane is ≥1000mm and the thickness uniformity error is ≤±2%.

[0048] In this step, the hot pressing process adopts a roll-to-roll continuous production process. The hot pressing temperature of the roll-to-roll continuous production process is 180℃±5℃, the pressure is 1.5MPa±0.2MPa, and the coating speed is 5m / min±0.2m / min.

[0049] This invention achieves a membrane conductivity ≥80 mS / cm, alkali resistance life ≥3000 hours, and CO2 permeability ≤1×10⁻⁶ by using a gradient pore structure design, the addition of a phenothiazine free radical scavenger, and a continuous roll-to-roll process. -6 cm 3 / cm 2 The anion exchange membrane prepared by this invention offers several advantages. Firstly, it possesses excellent mechanical strength and high tensile strength, enabling the membrane to withstand tensile forces and resist breakage. Secondly, its good elongation at break provides flexibility and toughness, buffering stress and preventing brittle fracture. Its overall mechanical properties surpass those of some similar products. This invention significantly improves the performance and lifespan of AEM electrolyzers in pure water environments, providing crucial material support for the large-scale production of green hydrogen. This gives it enormous application potential in fields such as water electrolysis for hydrogen production and fuel cells.

[0050] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0051] The following examples use instruments and equipment conventional in the art. Experimental methods in the following examples, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer. All raw materials used in the following examples are conventional commercially available products with specifications conventional in the art. In this specification and the following examples, unless otherwise specified, "%" refers to weight percentage, "parts" refers to parts by weight, and "ratio" refers to weight proportion.

[0052] Example 1:

[0053] This embodiment discloses a method for preparing a highly stable anion exchange membrane resistant to CO2 corrosion, using the following raw materials:

[0054] Resin substrate: polyarylene ether nitrile (PAEN) resin (molecular weight 150,000 Da), phosphonate monomer (purity ≥ 99.5%).

[0055] Free radical scavengers: phenothiazine derivatives (C 12 H9NS, particle size ≤100nm).

[0056] The specific preparation method is as follows:

[0057] Step 1: Electrospinning to prepare the surface fiber membrane

[0058] PAEN resin was dissolved in NMP solvent (concentration 10wt%), and 0.5mol% phosphonate monomer was added. Electrospinning parameters: voltage 15kV, receiving distance 15cm, spinning time 30 minutes.

[0059] Step 2: Chemical cross-linking and impregnation to prepare a dense surface layer

[0060] The surface fiber membrane was immersed in an ethanol solution containing 0.8 wt% phenothiazine derivative for 30 minutes, dried at 60°C, and then subjected to ultraviolet crosslinking under a nitrogen atmosphere (wavelength 365 nm, intensity 50 mW / cm). 2 (Time: 10 minutes)

[0061] Step 3: Inner support layer coating and hot pressing

[0062] PAEN resin solution (20wt%) is coated onto a polyester base film, and a porous inner support layer is formed by phase separation (water coagulation bath). The surface dense layer and the inner support layer are then combined and hot-pressed. The coating-hot-pressing integrated equipment is used, with a coating speed of 5m / min, a hot-pressing temperature of 180℃, and a pressure of 1.5MPa.

[0063] The final product is a highly stable anion exchange membrane resistant to CO2 corrosion. The surface dense layer has a fiber diameter of 82 nm and a thickness of 5 μm, while the inner support layer has a pore size of 71 nm and a thickness of 20 μm.

[0064] The performance of the anion exchange membrane prepared in this embodiment was verified:

[0065] CO2 tolerance: After immersion in 1M KOH electrolyte containing 5% CO2 for 1000 hours, the membrane resistance growth rate is <5%, and the conductivity retention rate is ≥85%.

[0066] Mechanical strength: Tensile strength ≥65MPa (ASTM D882 standard), elongation at break ≥15%.

[0067] Example 2:

[0068] This embodiment discloses a method for preparing a highly stable anion exchange membrane resistant to CO2 corrosion, using the following raw materials:

[0069] Resin substrate: polyarylene ether nitrile (PAEN) resin (molecular weight 150,000 Da), phosphonate monomer (purity ≥ 99.5%).

[0070] Free radical scavengers: phenothiazine derivatives (C 12 H9NS, particle size ≤100nm).

[0071] The specific preparation method is as follows:

[0072] Step 1: Electrospinning to prepare the surface fiber membrane

[0073] PAEN resin was dissolved in NMP solvent (concentration 10wt%), and 0.5mol% phosphonate monomer was added. Electrospinning parameters: voltage 20kV, receiving distance 17cm, spinning time 40 minutes.

[0074] Step 2: Chemical cross-linking and impregnation to prepare a dense surface layer

[0075] The surface fiber membrane was immersed in an ethanol solution containing 0.8 wt% phenothiazine derivative for 35 minutes, dried at 65°C, and then subjected to ultraviolet crosslinking under a nitrogen atmosphere (wavelength 365 nm, intensity 50 mW / cm). 2 (Time: 10 minutes)

[0076] Step 3: Inner support layer coating and hot pressing

[0077] PAEN resin solution (20wt%) was coated onto a polyester base film, and a porous inner support layer was formed by phase separation (water coagulation bath). The surface dense layer and the inner support layer were then combined and hot-pressed. The coating-hot-pressing integrated equipment was used, with a coating speed of 5.2m / min, a hot-pressing temperature of 185℃, and a pressure of 1.7MPa.

[0078] The final product is a highly stable anion exchange membrane resistant to CO2 corrosion. The surface dense layer has a fiber diameter of 87 nm and a thickness of 5.2 μm, while the inner support layer has a pore size of 88 nm and a thickness of 21 μm.

[0079] Example 3:

[0080] This embodiment discloses a method for preparing a highly stable anion exchange membrane resistant to CO2 corrosion, using the following raw materials:

[0081] Resin substrate: polyarylene ether nitrile (PAEN) resin (molecular weight 150,000 Da), phosphonate monomer (purity ≥ 99.5%).

[0082] Free radical scavengers: phenothiazine derivatives (C 12 H9NS, particle size ≤100nm).

[0083] The specific preparation method is as follows:

[0084] Step 1: Electrospinning to prepare the surface fiber membrane

[0085] PAEN resin was dissolved in NMP solvent (concentration 10wt%), and 0.5mol% phosphonate monomer was added. Electrospinning parameters: voltage 12kV, receiving distance 20cm, spinning time 45 minutes.

[0086] Step 2: Chemical cross-linking and impregnation to prepare a dense surface layer

[0087] The surface fiber membrane was immersed in an ethanol solution containing 0.8 wt% phenothiazine derivative for 40 minutes, dried at 55°C, and then subjected to ultraviolet crosslinking under a nitrogen atmosphere (wavelength 365 nm, intensity 50 mW / cm). 2 (Time: 10 minutes)

[0088] Step 3: Inner support layer coating and hot pressing

[0089] PAEN resin solution (20wt%) was coated onto a polyester base film, and a porous inner support layer was formed by phase separation (water coagulation bath). The surface dense layer and the inner support layer were then combined and hot-pressed. The coating-hot-pressing integrated equipment was used, with a coating speed of 4.8m / min, a hot-pressing temperature of 175℃, and a pressure of 1.3MPa.

[0090] The final product is a highly stable anion exchange membrane resistant to CO2 corrosion. The surface dense layer has a fiber diameter of 73 nm and a thickness of 4.9 μm, while the inner support layer has a pore size of 65 nm and a thickness of 18 μm.

[0091] Example 4:

[0092] This embodiment discloses a method for preparing a highly stable anion exchange membrane resistant to CO2 corrosion, using the following raw materials:

[0093] Resin substrate: polyarylene ether nitrile (PAEN) resin (molecular weight 150,000 Da), phosphonate monomer (purity ≥ 99.5%).

[0094] Free radical scavengers: phenothiazine derivatives (C 12 H9NS, particle size ≤100nm).

[0095] The specific preparation method is as follows:

[0096] Step 1: Electrospinning to prepare the surface fiber membrane

[0097] PAEN resin was dissolved in NMP solvent (concentration 10wt%), and 0.5mol% phosphonate monomer was added. Electrospinning parameters: voltage 10kV, receiving distance 18cm, spinning time 35 minutes.

[0098] Step 2: Chemical cross-linking and impregnation to prepare a dense surface layer

[0099] The surface fiber membrane was immersed in an ethanol solution containing 0.8 wt% phenothiazine derivative for 30 minutes, dried at 55°C, and then subjected to ultraviolet crosslinking under a nitrogen atmosphere (wavelength 365 nm, intensity 50 mW / cm). 2 (Time: 10 minutes)

[0100] Step 3: Inner support layer coating and hot pressing

[0101] PAEN resin solution (20wt%) was coated onto a polyester base film, and a porous inner support layer was formed by phase separation (water coagulation bath). The surface dense layer and the inner support layer were then combined and hot-pressed. The coating-hot-pressing integrated equipment was used, with a coating speed of 5.1m / min, a hot-pressing temperature of 180℃, and a pressure of 1.5MPa.

[0102] The final product is a highly stable anion exchange membrane resistant to CO2 corrosion. The surface dense layer has a fiber diameter of 75 nm and a thickness of 4.9 μm, while the inner support layer has a pore size of 89 nm and a thickness of 18 μm.

[0103] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A highly stable anion exchange membrane resistant to CO2 corrosion, characterized in that, It includes a surface dense layer and an inner support layer; the surface dense layer is a PAEN nanofiber layer, in which phosphonate groups and free radical scavengers are doped; the inner support layer is a porous PAEN substrate.

2. The highly stable anion exchange membrane resistant to CO2 corrosion according to claim 1, characterized in that, The PAEN nanofiber layer has a fiber diameter of 80nm±10nm and a thickness of 5μm±0.5μm.

3. The highly stable anion exchange membrane resistant to CO2 corrosion according to claim 1, characterized in that, The doping amount of the phosphonate group is 0.5 mol%; the free radical scavenger is a phenothiazine derivative with a doping amount of 0.8 wt%.

4. The highly stable anion exchange membrane resistant to CO2 corrosion according to claim 1, characterized in that, The porous PAEN substrate has a pore size of 50nm to 100nm, a porosity of ≥70%, and a thickness of 20μm ±2μm.

5. A method for preparing a highly stable anion exchange membrane resistant to CO2 corrosion as described in any one of claims 1 to 5, characterized in that, Includes the following steps: PAEN resin was dissolved in NMP solvent, and phosphonate monomers were added to provide an electrospinning process to prepare the surface fiber membrane. The surface fiber membrane is immersed in an ethanol solution of phenothiazine derivative for a preset time and then dried. It is then subjected to ultraviolet crosslinking to obtain a dense surface layer. PAEN resin solution is coated onto a polyester base film, and a porous inner support layer is formed by phase separation. An anion exchange membrane is prepared by hot pressing a composite surface dense layer and an inner support layer.

6. The method for preparing a highly stable anion exchange membrane resistant to CO2 corrosion according to claim 5, characterized in that, The concentration of PAEN resin in NMP solvent is 10 wt%; the voltage of the electrospinning process is 10 kV to 20 kV, the receiving distance is 15 cm to 20 cm, and the spinning time is 30 minutes to 50 minutes.

7. The method for preparing a highly stable anion exchange membrane resistant to CO2 corrosion according to claim 5, characterized in that, The preset time is 30 to 40 minutes; the drying temperature is 55°C to 65°C.

8. The method for preparing a highly stable anion exchange membrane resistant to CO2 corrosion according to claim 5, characterized in that, The ultraviolet crosslinking process was carried out under a nitrogen atmosphere, using a wavelength of 365 nm and an intensity of 50 mW / cm². 2 Ultraviolet light.

9. The method for preparing a highly stable anion exchange membrane resistant to CO2 corrosion according to claim 5, characterized in that, The concentration of the PAEN resin solution is 20 wt%.

10. The method for preparing a highly stable anion exchange membrane resistant to CO2 corrosion according to claim 5, characterized in that, The hot pressing process adopts a roll-to-roll continuous production process. The hot pressing temperature of the roll-to-roll continuous production process is 180℃±5℃, the pressure is 1.5MPa±0.2MPa, and the coating speed is 5m / min±0.2m / min.

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