Proton exchange membrane for electrolytic tank based on laser surface patterning modification, preparation method of proton exchange membrane, membrane electrode and electrolytic tank

Abstract

The invention relates to the technical field of electrolytic tanks, in particular to a proton exchange membrane for an electrolytic tank based on laser surface patterning modification, a preparation method of the proton exchange membrane, a membrane electrode and the electrolytic tank. According to the invention, a laser is adopted to emit laser, and patterning processing is carried out on the surface of the proton exchange membrane for the electrolytic tank, so that the proton exchange membrane for the electrolytic tank based on laser surface patterning modification is obtained. The proton exchange membrane for the electrolytic tank based on laser surface patterning modification obtained by the method solves the problem of two-dimensional contact between a proton exchange membrane for a commercial electrolytic tank and a catalyst layer, reduces the internal resistance, increases a three-phase reaction zone, and improves the reaction efficiency. The technical defects existing in approximate two-dimensional plane contact between the proton exchange membrane for the electrolytic tank with a smooth and compact surface and the catalyst layer are overcome. Meanwhile, the proton exchange membrane for the electrolytic tank based on laser surface patterning modification is firstly used for preparing a membrane electrode, then the membrane electrode is used for preparing the electrolytic tank, and the electrolytic tank is applied.

Description

Technical Field

[0001] The invention relates to the technical field of electrolytic cells, in particular to a proton exchange membrane for an electrolytic cell based on laser surface patterning modification and a preparation method thereof, a membrane electrode and an electrolytic cell. Background Art

[0002] Proton exchange membrane electrolyzer (PEMEL) is a cell with high electrolysis efficiency (up to 85%) and high current density (generally higher than 1A / cm 2 ), high hydrogen purity (up to 99.999%), and its advantages of small size, light weight, compact structure and fast response speed of electrolyzer, are widely used in the field of renewable energy and are considered to be one of the most promising water electrolysis technologies. In PEMEL, membrane electrode (MEA) is the core component where the chemical reaction occurs, which mainly consists of three parts: proton exchange membrane (PEM) located in the center, catalyst layer (CL) located on both sides of PEM and gas diffusion layer (GDL) located on the outermost side.

[0003] The three key components of MEA play an important role in the electrolysis process to ensure the smooth progress of the electrolysis reaction. The ideal membrane electrode should have the following characteristics:

[0004] (1) Excellent gas-liquid mass transfer capability; this requires that the ionomers of the proton exchange membrane and the catalyst layer should have high proton conductivity, and that the gas generated by the reaction in the gas diffusion layer can be discharged quickly.

[0005] (2) Good electrical conductivity: The various parts of the membrane electrode need to be in close contact to reduce impedance, and the catalyst layer and gas diffusion layer also need to have good electronic conductivity.

[0006] (3) A sufficient number of three-phase reaction zones. The number of three-phase reaction zones consisting of the catalyst (solid phase), water (liquid phase) and generated gas (gas phase) directly affects the reaction rate. The more three-phase reaction zones there are, the higher the utilization rate of the catalyst, and thus the better the performance of the electrolyzer.

[0007] (4) Sufficiently long component life; this requires the proton exchange membrane to have good mechanical stability, thermal stability and chemical stability.

[0008] However, the proton membrane prepared using the existing preparation process usually has a smooth and dense surface, and can only achieve approximately two-dimensional contact with the catalyst layer. This results in a poor interface structure between its surface and the catalyst layer, which increases the internal resistance to a certain extent, limits the number of three-phase reaction zones, and thus restricts the improvement of the electrolytic performance of the electrolyzer. Summary of the invention

[0009] In view of the shortcomings of the above-mentioned prior art, the present invention provides a proton exchange membrane for an electrolytic cell based on laser surface patterning modification and a preparation method thereof, a membrane electrode and an electrolytic cell, wherein the surface of the proton exchange membrane for an electrolytic cell is patterned by using a laser to emit laser light, thereby obtaining a proton exchange membrane for an electrolytic cell based on laser surface patterning modification. The proton exchange membrane for an electrolytic cell based on laser surface patterning modification obtained by the method of the present invention solves the problem of two-dimensional contact between the proton exchange membrane for a commercial electrolytic cell and the catalyst layer, reduces internal resistance, increases the three-phase reaction area, and overcomes the technical defects of the approximately two-dimensional planar contact between the proton exchange membrane for an electrolytic cell with a smooth and dense surface and the catalyst layer.

[0010] The present invention is achieved by adopting the following technical solutions:

[0011] The present invention protects a method for preparing a proton exchange membrane for an electrolytic cell based on laser surface patterning modification, comprising the following steps:

[0012] The proton exchange membrane for the electrolytic cell is placed flat on a processing table, and a laser is used to emit a laser. The laser has the characteristics of high power, high precision, and little destructiveness to the sample, and the surface of the proton exchange membrane for the electrolytic cell is patterned.

[0013] Preferably, the proton exchange membrane for the electrolytic cell is selected from Nafion series membranes, Gore-select membranes, and Flemion membranes.

[0014] Preferably, the laser is selected from one or more of ultraviolet laser, visible light laser, near infrared laser and far infrared laser.

[0015] Preferably, the wavelength of the ultraviolet laser is 100 nm to 400 nm, the wavelength of the visible light laser is 400 nm to 700 nm, the wavelength of the near infrared laser is 700 nm to 1400 nm, and the wavelength of the far infrared laser is 9.0 μm to 11.0 μm.

[0016] Preferably, the processing power of the laser is 1 mW to 20 kW, and the pulse width is 10 fs to CW.

[0017] Preferably, the processing mode of the laser is a dot matrix mode or a linear scanning mode.

[0018] Preferably, the patterned processing area of ​​the proton exchange membrane for an electrolytic cell is the entire surface processing or the partial surface processing, for example, the patterned processing is single-sided processing or double-sided processing.

[0019] The present invention also protects a proton exchange membrane for an electrolytic cell prepared by the above preparation method based on laser surface patterning modification.

[0020] Preferably, the surface of the proton exchange membrane for electrolytic cell modified by laser surface patterning is a patterned structure, and the patterned structure is composed of grooves, and the dimensions of the grooves are: depth 1.0nm~1.0mm, width 1.0nm~1.0mm, and spacing 1.0nm~1.0mm.

[0021] The present invention also protects a membrane electrode, which is composed of an anode catalyst layer, a cathode catalyst layer, an anode gas diffusion layer, a cathode gas diffusion layer and the above-mentioned proton exchange membrane for an electrolytic cell modified based on laser surface patterning.

[0022] The membrane electrode was prepared according to the following steps:

[0023] The electrolytic cell proton exchange membrane based on laser surface patterning modification is placed in the middle position;

[0024] The cathode catalyst slurry and the anode catalyst slurry are respectively attached to both sides of the proton exchange membrane for the electrolytic cell modified based on laser surface patterning by spraying, transfer or coating to form a cathode catalyst layer and an anode catalyst layer.

[0025] The cathode gas diffusion layer is arranged on the side of the cathode catalyst layer away from the proton exchange membrane for electrolysis cell modified based on laser surface patterning, and the anode gas diffusion layer is arranged on the side of the anode catalyst layer away from the proton exchange membrane for electrolysis cell modified based on laser surface patterning. Here, the gas diffusion layer and the catalyst layer can be combined, and the arrangement includes spraying, coating, transfer, hot pressing or lamination.

[0026] The modified surface of the proton exchange membrane for electrolytic cells based on laser surface patterning modification can be selected according to actual use needs. If the patterning process is single-sided processing, the modified surface of the proton exchange membrane for electrolytic cells based on laser surface patterning modification is only close to the anode catalyst layer or only close to the cathode catalyst layer; if the patterning process is double-sided processing, the modified surface of the proton exchange membrane for electrolytic cells based on laser surface patterning modification is close to both the anode catalyst layer and the cathode catalyst layer.

[0027] The invention also protects an electrolytic cell, which is composed of an anode plate, a cathode plate, a gasket and a membrane electrode.

[0028] Preferably, the electrolytic cell is prepared according to the following steps:

[0029] The anode plate and the cathode plate are respectively arranged on the anode side and the cathode side of the membrane electrode, and the gasket is arranged on one side or both sides of the proton exchange membrane for the electrolytic cell based on laser surface patterning modification and is located between the anode plate and the cathode plate.

[0030] Preferably, the gasket can be selected according to actual use needs, and the gasket is selected from a silicone gasket, a polytetrafluoroethylene gasket (PTFE gasket) or a fluorinated ethylene propylene copolymer gasket (FEP gasket).

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention uses a laser to emit laser light to pattern the surface of the proton exchange membrane for the electrolytic cell, thereby obtaining a proton exchange membrane for the electrolytic cell based on laser surface patterning modification. The use of laser to treat the surface of the proton exchange membrane for the electrolytic cell has the advantages of easy processing, high efficiency, low cost, and little damage to the proton exchange membrane for the electrolytic cell.

[0033] 2. The method of the present invention is used to obtain a proton exchange membrane for an electrolytic cell based on laser surface patterning modification. After patterning, grooves are generated on the surface of the proton exchange membrane for the electrolytic cell. The surface grooves increase the contact area between the proton exchange membrane for the electrolytic cell and the catalyst layer, increase the electrochemical active sites, and are beneficial to improving the efficiency of the electrochemical reaction.

[0034] 3. The two-dimensional plane of the proton exchange membrane for electrolytic cells obtained by the method of the present invention based on laser surface patterning modification is eliminated, and it becomes a three-dimensional contact with a deep structure, which solves the two-dimensional contact problem between the proton exchange membrane for commercial electrolytic cells and the catalyst layer. At the same time, the surface groove pattern increases the contact area between the proton exchange membrane for electrolytic cells and the catalyst layer, increases the electrochemical active sites, reduces the internal resistance, and increases the three-phase reaction area, which is conducive to improving the efficiency of the electrochemical reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present application, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 It is a schematic diagram of the proton exchange membrane for a patterned electrolytic cell, the preparation process of the proton exchange membrane for a patterned electrolytic cell, the membrane electrode, and the preparation process of the membrane electrode of the present invention.

[0037] Figure 2 This is a SEM image of the surface of the patterned proton exchange membrane for the electrolytic cell of Example 1.

[0038] Figure 3 The polarization curves of the membrane electrode cells prepared by using Examples 1 to 3 and Comparative Example 1 are shown.

[0039] Figure 4This is a graph showing the electrolysis efficiency of a membrane electrode cell prepared using Examples 1 to 3 and Comparative Example 1.

[0040] Figure 5 It is a schematic diagram of the structure of the electrolytic cell of Examples 1 to 3 and Comparative Example 1.

[0041] Description of reference numerals:

[0042] 1- anode catalyst layer, 2- cathode catalyst layer, 3- anode gas diffusion layer, 4- cathode gas diffusion layer, 5- anode plate, 6- cathode plate, 7- gasket. DETAILED DESCRIPTION

[0043] The specific implementation of the present invention will be further explained by the following detailed description, in which one or more embodiments are listed to help understand the practical application of the present invention. These embodiments are only used to explain the present invention, but not to limit its scope. For those skilled in the art, without departing from the core idea of ​​the present invention, the present invention can be modified, replaced or adjusted in various ways, and these changes should be deemed to be included in the protection scope of the present invention. For example, the features described in a certain embodiment can be combined with the features in other embodiments to form a new implementation. Therefore, the present invention is intended to cover all technical solutions that meet the claims and their equivalents. In addition, other objects, features and technical details of the present invention will be described in detail below or naturally derived therefrom. It should be understood by those skilled in the art that the description of this specification is exemplary only and is not intended to limit the scope of the present invention.

[0044] The weight or proportional relationship of the ingredients involved in the embodiments of the present invention can refer to specific values ​​or the relative proportions between the components. Therefore, the technical solutions that are enlarged or reduced according to the proportions disclosed in the embodiments of the present invention should be considered to be within the scope of protection of the present invention. Specifically, the weight units in the embodiments of the present invention can be units known in the art such as μg, mg, g, and kg, and the length units in the embodiments of the present invention can be units known in the art such as nm, μm, mm, and cm. Unless otherwise specified, all numerical parameters involved in the specification and claims should be understood as approximate values, and those skilled in the art can adjust them appropriately according to actual needs. In addition, the numerical range represented by endpoints includes all numerical values ​​and sub-ranges within the range, for example, the range of 10 to 50 includes but is not limited to 10, 15.5, 25, 30, 45, and 50.

[0045] The technical solution of the present invention is further studied by using embodiments and comparative examples below. The specific research methods and results are as follows:

[0046] Example 1

[0047] A method for preparing a proton exchange membrane for an electrolytic cell based on laser surface patterning modification comprises the following steps:

[0048] S1. Place the proton exchange membrane (Nafion 117 membrane) for the electrolytic cell flat on a horizontal processing table, fix the edges with tape, and flatten it.

[0049] S2. Use a laser to emit picosecond laser to perform specific patterning processing on the surface of the proton exchange membrane for the electrolytic cell; wherein the laser is selected from an ultraviolet laser with a wavelength of 355nm, a pulse width of 500fs, and a processing power of 3W.

[0050] S3. After the patterning processing, the proton exchange membrane for electrolytic cell is turned over, and then the laser is continued to emit picosecond laser on the smooth and dense surface of the proton exchange membrane for electrolytic cell to perform specific patterning processing. The processing conditions are the same as those in step S2, and a proton exchange membrane for electrolytic cell based on laser surface patterning modification is obtained.

[0051] In this embodiment, if Figure 2 As shown, the pattern on one side of the proton exchange membrane for an electrolytic cell based on laser surface patterning modification is a square grid-like gully pattern; the depth of the gully pattern is about 30 μm, the width is 15 μm, and the spacing between adjacent gully patterns is 40 μm.

[0052] A method for preparing a membrane electrode comprises the following steps:

[0053] S1. Place the above-mentioned proton exchange membrane for the electrolytic cell based on laser surface patterning modification in the middle position.

[0054] S2, respectively uniformly coating the cathode catalyst slurry and the anode catalyst slurry on both sides of the proton exchange membrane for the electrolytic cell based on the laser surface patterning modification, and then respectively forming a cathode catalyst layer and an anode catalyst layer on both sides of the proton exchange membrane for the electrolytic cell based on the laser surface patterning modification; wherein the cathode catalyst is selected from Pt, and the amount is 1 mg / cm 2 ; The anode catalyst is selected from IrO2, and the dosage is 2mg / cm 2 .

[0055] S3. Spray the cathode gas diffusion layer on the side of the cathode catalyst layer away from the proton exchange membrane for electrolytic cell modified based on laser surface patterning, and spray the anode gas diffusion layer on the side of the anode catalyst layer away from the proton exchange membrane for electrolytic cell modified based on laser surface patterning.

[0056] Specifically, this embodiment Figure 1 As shown, a membrane electrode was prepared for an electrolytic cell proton exchange membrane based on laser surface patterning modification, in which the modified surface was close to both the anode catalyst layer and the cathode catalyst layer.

[0057] A method for preparing an electrolytic cell, such as Figure 5 As shown, the following steps are included:

[0058] An anode plate, a cathode plate, a gasket and the above-mentioned membrane electrode are used, and the anode plate and the cathode plate are placed on the anode side and the cathode side of the membrane electrode respectively. Gaskets are sandwiched between the proton exchange membrane for the electrolytic cell based on laser surface patterning modification and the anode plate and the cathode plate. The gaskets include silicone gaskets and FEP gaskets. The FEP gasket is close to the proton exchange membrane for the electrolytic cell based on laser surface patterning modification.

[0059] Example 2

[0060] The method for preparing a proton exchange membrane for an electrolytic cell based on laser surface patterning modification is the same as the method for preparing in Example 1, except that only one side of the proton exchange membrane for an electrolytic cell is subjected to specific patterning processing, and comprises the following steps:

[0061] S1. Place the proton exchange membrane (Nafion 117 membrane) for the electrolytic cell flat on a horizontal processing table, fix the edges with tape, and flatten it.

[0062] S2. Use a laser to emit picosecond laser to perform specific patterning processing on the surface of the proton exchange membrane for the electrolytic cell; wherein the laser is selected from an ultraviolet laser with a wavelength of 355nm, a pulse width of 500fs, and a processing power of 3W.

[0063] A method for preparing a membrane electrode, which has the same preparation steps as those of Example 1, except that the modified surface is placed close to the cathode catalyst layer, comprises the following steps:

[0064] S1. Place the above-mentioned proton exchange membrane for the electrolytic cell based on laser surface patterning modification in the middle position.

[0065] S2, respectively uniformly coating the cathode catalyst slurry and the anode catalyst slurry on both sides of the proton exchange membrane for electrolytic cell modified by laser surface patterning, the modified surface of the proton exchange membrane for electrolytic cell modified by laser surface patterning is close to the cathode catalyst layer, and then forming a cathode catalyst layer and an anode catalyst layer on both sides of the proton exchange membrane for electrolytic cell modified by laser surface patterning; wherein the cathode catalyst is selected from Pt, and the amount is 1 mg / cm 2 ; The anode catalyst is selected from IrO2, and the dosage is 2mg / cm 2 .

[0066] S3. Spray the cathode gas diffusion layer on the side of the cathode catalyst layer away from the proton exchange membrane for electrolytic cell modified based on laser surface patterning, and spray the anode gas diffusion layer on the side of the anode catalyst layer away from the proton exchange membrane for electrolytic cell modified based on laser surface patterning.

[0067] A method for preparing an electrolytic cell comprises the following steps:

[0068] An anode plate, a cathode plate, a gasket and the above-mentioned membrane electrode are used, and the anode plate and the cathode plate are placed on the anode side and the cathode side of the membrane electrode respectively. Gaskets are sandwiched between the proton exchange membrane for the electrolytic cell based on laser surface patterning modification and the anode plate and the cathode plate. The gaskets include silicone gaskets and FEP gaskets. The FEP gasket is close to the proton exchange membrane for the electrolytic cell based on laser surface patterning modification.

[0069] Example 3

[0070] The method for preparing a proton exchange membrane for an electrolytic cell based on laser surface patterning modification is the same as the method for preparing in Example 1, except that only one side of the proton exchange membrane for an electrolytic cell is subjected to specific patterning processing, and comprises the following steps:

[0071] S1. Place the proton exchange membrane (Nafion 117 membrane) for the electrolytic cell flat on a horizontal processing table, fix the edges with tape, and flatten it.

[0072] S2. Use a laser to emit picosecond laser to perform specific patterning processing on the surface of the proton exchange membrane for the electrolytic cell; wherein the laser is selected from an ultraviolet laser with a wavelength of 355nm, a pulse width of 500fs, and a processing power of 3W.

[0073] A method for preparing a membrane electrode, which has the same preparation steps as those of Example 1, except that the modified surface is placed close to the anode catalyst layer, comprises the following steps:

[0074] S1. Place the above-mentioned proton exchange membrane for the electrolytic cell based on laser surface patterning modification in the middle position.

[0075] S2, respectively uniformly coating the cathode catalyst slurry and the anode catalyst slurry on both sides of the proton exchange membrane for electrolytic cell modified by laser surface patterning, the modified surface of the proton exchange membrane for electrolytic cell modified by laser surface patterning is close to the anode catalyst layer, and then forming a cathode catalyst layer and an anode catalyst layer on both sides of the proton exchange membrane for electrolytic cell modified by laser surface patterning; wherein the cathode catalyst is selected from Pt, and the amount is 1 mg / cm 2 ; The anode catalyst is selected from IrO2, and the dosage is 2mg / cm 2 .

[0076] S3. Spray the cathode gas diffusion layer on the side of the cathode catalyst layer away from the proton exchange membrane for electrolytic cell modified based on laser surface patterning, and spray the anode gas diffusion layer on the side of the anode catalyst layer away from the proton exchange membrane for electrolytic cell modified based on laser surface patterning.

[0077] A method for preparing an electrolytic cell comprises the following steps:

[0078] An anode plate, a cathode plate, a gasket and the above-mentioned membrane electrode are used, and the anode plate and the cathode plate are placed on the anode side and the cathode side of the membrane electrode respectively. Gaskets are sandwiched between the proton exchange membrane for the electrolytic cell based on laser surface patterning modification and the anode plate and the cathode plate. The gaskets include silicone gaskets and FEP gaskets. The FEP gasket is close to the proton exchange membrane for the electrolytic cell based on laser surface patterning modification.

[0079] Example 4

[0080] A method for preparing a proton exchange membrane for an electrolytic cell based on laser surface patterning modification comprises the following steps:

[0081] S1. Place the proton exchange membrane (Nafion 117 membrane) for the electrolytic cell flat on a horizontal processing table, fix the edges with tape, and flatten it.

[0082] S2. Using a laser to emit laser, the surface of the proton exchange membrane for the electrolytic cell is subjected to specific pattern processing; wherein the laser is selected from an infrared laser with a wavelength of 1064nm, a pulse width of 10fs, and a processing power of 20kW.

[0083] S3. After the patterning processing, the proton exchange membrane for electrolytic cell is turned over, and then the laser is continuously emitted on the smooth and dense surface of the proton exchange membrane for electrolytic cell to perform specific patterning processing. The processing conditions are the same as those in step S2, and a proton exchange membrane for electrolytic cell modified based on laser surface patterning is obtained.

[0084] Example 5

[0085] A method for preparing a proton exchange membrane for an electrolytic cell based on laser surface patterning modification comprises the following steps:

[0086] S1. Place the proton exchange membrane (Nafion 117 membrane) for the electrolytic cell flat on a horizontal processing table, fix the edges with tape, and flatten it.

[0087] S2. Using a laser to emit laser, the surface of the proton exchange membrane for the electrolytic cell is subjected to specific pattern processing; wherein the laser is selected from a visible light laser with a wavelength of 532nm, a pulse width of 1s, and a processing power of 1mW.

[0088] S3. After the patterning processing, the proton exchange membrane for electrolytic cell is turned over, and then the laser is continuously emitted on the smooth and dense surface of the proton exchange membrane for electrolytic cell to perform specific patterning processing. The processing conditions are the same as those in step S2, and a proton exchange membrane for electrolytic cell modified based on laser surface patterning is obtained.

[0089] Comparative Example 1

[0090] The preparation steps are the same as those in Example 1, except that a conventional proton exchange membrane for an electrolytic cell is used to replace the proton exchange membrane for an electrolytic cell modified by laser surface patterning, and specifically include the following steps:

[0091] A method for preparing a membrane electrode comprises the following steps:

[0092] S1. Place the proton exchange membrane of the electrolytic cell in the middle position.

[0093] S2, respectively, uniformly coating the cathode catalyst slurry and the anode catalyst slurry on both sides of the proton exchange membrane for the electrolytic cell, and then respectively forming a cathode catalyst layer and an anode catalyst layer on both sides of the proton exchange membrane for the electrolytic cell; wherein the cathode catalyst is selected from Pt, and the amount is 1 mg / cm 2 ; The anode catalyst is selected from IrO2, and the dosage is 2mg / cm 2 .

[0094] S3, spraying the cathode gas diffusion layer on the side of the cathode catalyst layer away from the proton exchange membrane for the electrolytic cell, and spraying the anode gas diffusion layer on the side of the anode catalyst layer away from the proton exchange membrane for the electrolytic cell.

[0095] A method for preparing an electrolytic cell comprises the following steps:

[0096] An anode plate, a cathode plate, a gasket and the above-mentioned membrane electrode are used, and the anode plate and the cathode plate are placed on the anode side and the cathode side of the membrane electrode respectively. Gaskets are sandwiched between the proton exchange membrane for the electrolytic cell based on laser surface patterning modification and the anode plate and the cathode plate. The gaskets include silicone gaskets and FEP gaskets. The FEP gasket is close to the proton exchange membrane for the electrolytic cell based on laser surface patterning modification.

[0097] The electrochemical performance of the electrolytic cells of the above three embodiments and comparative example 1 was tested under the following conditions: water inlet temperature 80°C, water inlet rate 15 mL / min, and polarization curve test method: using a DC power supply, 0.1 A / cm 2 As the step length, add 0~3A / cm at both ends of the electrolytic cell. 2The current density is kept at 5 minutes at each current density, and the change of the cell voltage is recorded. The electrolysis efficiency test method is: according to the formula "efficiency = cell voltage / 1.48V", 1.48V is understood as the ideal electrolysis voltage. When the voltage reaches 1.48V, the electrolysis efficiency is 100%. A polarization curve corresponds to a point electrolysis efficiency curve.

[0098] The results are as follows Figure 3 and Figure 4 As shown, the polarization curves of the membrane electrode single cell prepared by using Examples 1 to 3 and Comparative Example 1 are as shown Figure 3 As shown, the single cell electrolysis efficiency is Figure 4 shown.

[0099] Depend on Figure 3 and Figure 4 It can be seen that at 3A / cm 2 Under current density, in Comparative Example 1, the voltage of the untreated conventional proton exchange membrane for electrolytic cell is 3.02V, and the efficiency is 48.99%; in Example 1, the voltage of the double-sided treated membrane is 2.29V, and the efficiency is 64.47%; in Example 2, the voltage of the single-sided anode treated membrane is 2.82V, and the efficiency is 52.47%; in Example 3, the voltage of the single-sided cathode treated membrane is 2.37V, and the efficiency is 62.26%. It can be seen that compared with Comparative Example 1, the membrane electrode prepared by the proton exchange membrane for electrolytic cell based on laser surface patterning modification in the embodiment shows lower electrolysis voltage and higher electrolysis efficiency.

[0100] The technical features described in the various embodiments of the present invention can be modified or combined according to actual needs. To simplify the description, all possible combinations of technical features are not listed one by one herein, but as long as there are no technical contradictions in these combinations, they should be deemed to be included in the protection scope of the present invention. It should be noted that the above embodiments are only several specific implementation methods of the present invention, which are intended to help understand the technical solutions of the present invention, rather than to limit its protection scope. For those skilled in the art, the present invention can be subjected to various deformations, improvements or extensions without departing from the core concept of the present invention, and these technical solutions should all be deemed to be part of the protection scope of the present invention.

[0101] In addition, other technical solutions obtained by those skilled in the art based on the technical solution provided by the present invention through logical analysis, reasoning or limited experiments should also be deemed to be included in the protection scope of the claims of the present invention. Therefore, the protection scope of the present invention shall be based on the content of the claims, and the description and drawings may be used to assist in interpreting the meaning of the claims, but shall not be used as a basis for limiting the protection scope.

Claims

1. A method for preparing a proton exchange membrane for an electrolytic cell based on laser surface patterning modification, characterized in that: The steps include: The surface of the proton exchange membrane for the electrolytic cell is patterned using a laser.

2. The method for preparing a proton exchange membrane for an electrolytic cell based on laser surface patterning modification according to claim 1, characterized in that: The laser is selected from one or more of ultraviolet laser, visible light laser, near infrared laser and far infrared laser.

3. The method for preparing a proton exchange membrane for an electrolytic cell based on laser surface patterning modification according to claim 2, characterized in that: The wavelength of ultraviolet laser is 100nm~400nm, the wavelength of visible light laser is 400nm~700nm, the wavelength of near-infrared laser is 700nm~1400nm, and the wavelength of far-infrared laser is 9.0μm~11.0μm.

4. The method for preparing a proton exchange membrane for an electrolytic cell based on laser surface patterning modification according to claim 1, characterized in that: A laser is used to provide laser light, the processing power of the laser light is 1mW to 20kW, and the pulse width is 1fs to 1s.

5. The method for preparing a proton exchange membrane for an electrolytic cell based on laser surface patterning modification according to claim 4, characterized in that: The laser processing method is dot matrix or linear scanning.

6. The method for preparing a proton exchange membrane for an electrolytic cell based on laser surface patterning modification according to claim 1, characterized in that: The patterned processing area of ​​the proton exchange membrane for an electrolytic cell is the entire surface processing or the partial surface processing.

7. A proton exchange membrane for an electrolytic cell prepared by the preparation method according to any one of claims 1 to 6 and modified by laser surface patterning.

8. The proton exchange membrane for electrolytic cell based on laser surface patterning modification according to claim 7, characterized in that: The surface of the proton exchange membrane for the electrolytic cell modified by laser surface patterning is a patterned structure, which is composed of grooves. The dimensions of the grooves are: depth 1.0nm~1.0mm, width 1.0nm~1.0mm, and spacing 1.0nm~1.0mm.

9. A membrane electrode, characterized in that: It is composed of an anode catalyst layer (1), a cathode catalyst layer (2), an anode gas diffusion layer (3), a cathode gas diffusion layer (4) and a proton exchange membrane for an electrolytic cell based on laser surface patterning modification according to claim 7; The membrane electrode was prepared according to the following steps: The proton exchange membrane for the electrolytic cell based on laser surface patterning modification is placed in the middle position; The cathode catalyst slurry and the anode catalyst slurry are respectively attached to both sides of the proton exchange membrane for the electrolytic cell modified based on laser surface patterning, and the cathode catalyst layer (2) and the anode catalyst layer (1) are formed; The cathode gas diffusion layer (4) is arranged on a side of the cathode catalyst layer (2) away from the proton exchange membrane for an electrolytic cell modified based on laser surface patterning, and the anode gas diffusion layer (3) is arranged on a side of the anode catalyst layer (1) away from the proton exchange membrane for an electrolytic cell modified based on laser surface patterning.

10. An electrolytic cell, characterized in that: It consists of an anode plate (5), a cathode plate (6), a gasket (7) and the membrane electrode according to claim 9.

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