Proton exchange membrane, preparation method thereof and fuel cell

Abstract

The invention discloses a proton exchange membrane, a preparation method thereof and a fuel cell, and belongs to the technical field of fuel cells, the preparation method of the proton exchange membrane comprises the following steps: adding 3-7 parts of polyvinyl alcohol, 1-5 parts of polyethylene glycol and 0.1-0.5 part of dodecyl trimethyl ammonium chloride into 80-120 parts of water to obtain a solution A; adding 1-5 parts of polytetrafluoroethylene, 1-5 parts of oleamide and 1-5 parts of modified carbon nanotubes into 80-120 parts of a first organic solvent, and performing dispersion treatment to obtain a solution B; the modified carbon nano tube is a silane coupling agent modified carbon nano tube; mixing the solution A and the solution B according to a certain volume ratio, and performing dispersion treatment to obtain a colloid emulsion; pouring the colloid emulsion on a horizontal plate for membrane scraping treatment, drying, and stripping to obtain the proton exchange membrane. By adding polytetrafluoroethylene, oleamide, modified carbon nanotubes and the like as raw materials, the mechanical properties such as tensile strength and the like of the proton exchange membrane can be remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of fuel cells, in particular to a proton exchange membrane and a preparation method thereof, and a fuel cell. Background Art

[0002] Proton exchange membrane fuel cells are batteries that directly convert chemical energy generated by the reaction of fuel and oxidant into electrical energy. They have the advantages of high energy conversion efficiency and low environmental pollution. Proton exchange membrane is the core component of proton exchange membrane fuel cells. It not only acts as a barrier, but also conducts protons.

[0003] There are many types of proton exchange membranes, and polyvinyl alcohol proton exchange membrane is one of the more common proton exchange membranes. Although the existing polyvinyl alcohol proton exchange membrane has advantages such as simple membrane forming process, it has problems such as poor mechanical properties of the film, so it is urgently needed to be improved. Summary of the invention

[0004] The object of the present invention is to provide a proton exchange membrane and a preparation method thereof and a fuel cell to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] A method for preparing a proton exchange membrane comprises the following steps:

[0007] In parts by weight, 3-7 parts of polyvinyl alcohol, 1-5 parts of polyethylene glycol, and 0.1-0.5 parts of dodecyltrimethylammonium chloride are added to 80-120 parts of water to obtain solution A;

[0008] According to weight parts, 1-5 parts of polytetrafluoroethylene, 1-5 parts of oleic acid amide, and 1-5 parts of modified carbon nanotubes are added to 80-120 parts of the first organic solvent, and dispersed to obtain solution B; the modified carbon nanotubes are carbon nanotubes modified by a silane coupling agent;

[0009] Solution A and solution B are mixed in a certain volume ratio and dispersed to obtain a colloidal emulsion;

[0010] The colloidal emulsion is poured onto a horizontal plate for scraping treatment, and after drying, it is peeled off to obtain a proton exchange membrane.

[0011] Preferably, the first organic solvent is butanone or acetone.

[0012] Preferably, the modification method of the modified carbon nanotubes comprises the following steps:

[0013] The carbon nanotubes and the silane coupling agent are added to a second organic solvent for dispersion treatment, and then the second organic solvent is removed and a drying treatment is performed to obtain modified carbon nanotubes.

[0014] Preferably, the dispersion treatment method is ultrasonic dispersion, and the ultrasonic frequency of the ultrasonic dispersion is 30-50 kHz.

[0015] Preferably, the mass ratio of the carbon nanotubes to the silane coupling agent is 10:(0.5-1).

[0016] Preferably, the silane coupling agent is vinyltriethoxysilane or vinyltrimethoxysilane.

[0017] Preferably, the second organic solvent is ethanol.

[0018] Preferably, the solution A and solution B are mixed in a volume ratio of 1:(0.4-0.8).

[0019] Another object of an embodiment of the present invention is to provide a proton exchange membrane prepared by the above preparation method.

[0020] Another object of an embodiment of the present invention is to provide an application of the above-mentioned proton exchange membrane in a fuel cell.

[0021] Another object of an embodiment of the present invention is to provide a fuel cell, comprising a catalyst layer, a diffusion layer, a bipolar plate and the above-mentioned proton exchange membrane.

[0022] The preparation method of the proton exchange membrane provided by the present invention can significantly improve the mechanical properties such as tensile strength of the proton exchange membrane by adding polytetrafluoroethylene, oleamide, modified carbon nanotubes and the like as raw materials; wherein the modified carbon nanotubes added by the present invention are obtained by modification treatment with a silane coupling agent, which can improve the dispersibility of the carbon nanotubes in the colloidal emulsion, thereby improving the film performance of the proton exchange membrane. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] In one embodiment of the present invention, a method for preparing a proton exchange membrane is provided, comprising the following steps:

[0025] S1. Add 3-7 parts of polyvinyl alcohol, 1-5 parts of polyethylene glycol, and 0.1-0.5 parts of dodecyltrimethylammonium chloride to 80-120 parts of water, according to parts by weight, to obtain solution A;

[0026] S2, according to weight parts, adding 1-5 parts of polytetrafluoroethylene, 1-5 parts of oleic acid amide, and 1-5 parts of modified carbon nanotubes to 80-120 parts of the first organic solvent, and performing dispersion treatment to obtain solution B; the modified carbon nanotubes are carbon nanotubes modified by a silane coupling agent;

[0027] S3, mixing solution A and solution B according to a certain volume ratio, and performing dispersion treatment to obtain a colloidal emulsion;

[0028] S4. Pour the colloidal emulsion onto a horizontal plate for scraping, and after drying, peel off to obtain a proton exchange membrane.

[0029] In practical applications, the raw materials used in the above steps are all commercially available products; preferably, in step S1, 4-6 parts of polyvinyl alcohol, 2-4 parts of polyethylene glycol, and 0.2-0.4 parts of dodecyltrimethylammonium chloride are added to 90-110 parts of water by weight to obtain solution A; in step S2, 2-4 parts of polytetrafluoroethylene, 2-4 parts of oleic acid amide, and 2-4 parts of modified carbon nanotubes are added to 90-110 parts of the first organic solvent by weight, and dispersed to obtain solution B.

[0030] In a preferred embodiment of the present invention, the first organic solvent is butanone or acetone; it should be noted that the first organic solvent may also be other organic solvents that can uniformly disperse raw materials such as polytetrafluoroethylene, oleamide, and modified carbon nanotubes, and is not limited thereto.

[0031] In a preferred embodiment of the present invention, the modification method of modified carbon nanotubes comprises the following steps:

[0032] The carbon nanotubes and the silane coupling agent are added to a second organic solvent for dispersion treatment, and then the second organic solvent is removed and a drying treatment is performed to obtain modified carbon nanotubes.

[0033] In a preferred embodiment of the present invention, the above-mentioned dispersion treatment methods can all adopt ultrasonic dispersion method, and the ultrasonic frequency of ultrasonic dispersion is 30-50kHz.

[0034] In a preferred embodiment of the present invention, in the modification method of modified carbon nanotubes, the mass ratio of carbon nanotubes to silane coupling agent is 10:(0.5-1), preferably 10:(0.6-0.8).

[0035] In a preferred embodiment of the present invention, the silane coupling agent is vinyl triethoxysilane or vinyl trimethoxysilane. Of course, other silane coupling agents that can improve the dispersibility of carbon nanotubes can also be used, and the present invention is not limited thereto.

[0036] In a preferred embodiment of the present invention, the second organic solvent is ethanol; it should be noted that the second organic solvent may also be other organic solvents that can evenly disperse raw materials such as carbon nanotubes and silane coupling agents, but is not limited thereto. In addition, the amount of the second organic solvent is not limited, as long as the carbon nanotubes and silane coupling agents are evenly mixed; the removal method of the second organic solvent may be a heating evaporation method, but is not limited thereto.

[0037] In a preferred embodiment of the present invention, solution A and solution B are mixed in a volume ratio of 1:(0.4-0.8); preferably, solution A and solution B are mixed in a volume ratio of 1:(0.5-0.7).

[0038] In another embodiment of the present invention, a fuel cell is provided, comprising a catalyst layer, a diffusion layer, a bipolar plate and the above-mentioned proton exchange membrane. It should be noted that the fuel cell is a proton exchange membrane fuel cell, and except for using the above-mentioned proton exchange membrane, the rest of the structural composition is the same as that of the existing proton exchange membrane fuel cell, which will not be described in detail here.

[0039] In the embodiment of the present invention, by adding polytetrafluoroethylene, oleamide, modified carbon nanotubes, etc. as raw materials, the mechanical properties such as tensile strength of the proton exchange membrane can be significantly improved. In addition, the modified carbon nanotubes added in the embodiment of the present invention are obtained by modification treatment with a silane coupling agent such as vinyltriethoxysilane or vinyltrimethoxysilane, which can improve the dispersibility of the carbon nanotubes in the colloidal emulsion, thereby improving the film performance of the proton exchange membrane.

[0040] The following embodiments are some specific implementation cases of the present invention in practical applications, but are not limited thereto.

[0041] Example 1: This example provides a method for preparing a proton exchange membrane, which comprises the following steps:

[0042] S1. Add 5 g of polyvinyl alcohol, 3 g of polyethylene glycol, and 0.3 g of dodecyltrimethylammonium chloride to 100 g of water, stir evenly, and obtain solution A for standby use;

[0043] S2, adding 3g of polytetrafluoroethylene, 2g of oleic acid amide, and 3g of modified carbon nanotubes to 100g of butanone, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz to obtain solution B for standby use; wherein the modified carbon nanotubes are carbon nanotubes modified by a silane coupling agent, and the modification method thereof is as follows: adding 10g of carbon nanotubes and 0.7g of vinyl triethoxysilane to 100mL of ethanol for ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz, then heating to remove ethanol, and performing drying treatment to obtain modified carbon nanotubes;

[0044] S3, mixing the above solution A and solution B in a volume ratio of 1:0.6, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40 kHz to obtain a colloidal emulsion;

[0045] S4, pouring the colloidal emulsion onto a horizontal plate for scraping, and after drying, peeling off to obtain a proton exchange membrane.

[0046] Example 2: This example provides a method for preparing a proton exchange membrane, which comprises the following steps:

[0047] S1, add 3g polyvinyl alcohol, 5g polyethylene glycol, and 0.1g dodecyltrimethylammonium chloride to 80g water, stir evenly to obtain solution A, and set aside;

[0048] S2, adding 1g of polytetrafluoroethylene, 1g of oleic acid amide, and 1g of modified carbon nanotubes to 80g of acetone, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 30kHz to obtain solution B for standby use; wherein the modified carbon nanotubes are carbon nanotubes modified by a silane coupling agent, and the modification method thereof is as follows: adding 10g of carbon nanotubes and 0.5g of vinyltrimethoxysilane to 100mL of ethanol for ultrasonic dispersion treatment at an ultrasonic frequency of 30kHz, then heating to remove ethanol, and performing drying treatment to obtain modified carbon nanotubes;

[0049] S3, mixing the above solution A and solution B in a volume ratio of 1:0.4, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 30 kHz to obtain a colloidal emulsion;

[0050] S4, pouring the colloidal emulsion onto a horizontal plate for scraping, and after drying, peeling off to obtain a proton exchange membrane.

[0051] Example 3: This example provides a method for preparing a proton exchange membrane, which comprises the following steps:

[0052] S1, add 7g polyvinyl alcohol, 1g polyethylene glycol, and 0.5g dodecyltrimethylammonium chloride to 120g water, stir evenly to obtain solution A, and set aside;

[0053] S2, adding 5g of polytetrafluoroethylene, 5g of oleic acid amide, and 5g of modified carbon nanotubes to 120g of acetone, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 50kHz to obtain solution B for standby use; wherein the modified carbon nanotubes are carbon nanotubes modified by a silane coupling agent, and the modification method thereof is as follows: adding 10g of carbon nanotubes and 1g of vinyltrimethoxysilane to 100mL of ethanol and performing ultrasonic dispersion treatment at an ultrasonic frequency of 50kHz, then heating to remove ethanol, and performing drying treatment to obtain modified carbon nanotubes;

[0054] S3, mixing the above solution A and solution B in a volume ratio of 1:0.8, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 50 kHz to obtain a colloidal emulsion;

[0055] S4, pouring the colloidal emulsion onto a horizontal plate for scraping, and after drying, peeling off to obtain a proton exchange membrane.

[0056] Example 4: This example provides a method for preparing a proton exchange membrane, which comprises the following steps:

[0057] S1, add 4g polyvinyl alcohol, 2g polyethylene glycol, and 0.2g dodecyltrimethylammonium chloride to 90g water, stir evenly to obtain solution A, and set aside;

[0058] S2, adding 2g of polytetrafluoroethylene, 2g of oleic acid amide, and 2g of modified carbon nanotubes to 90g of butanone, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz to obtain solution B for standby use; wherein the modified carbon nanotubes are carbon nanotubes modified by a silane coupling agent, and the modification method thereof is as follows: adding 10g of carbon nanotubes and 0.6g of vinyl triethoxysilane to 100mL of ethanol for ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz, then heating to remove ethanol, and performing drying treatment to obtain modified carbon nanotubes;

[0059] S3, mixing the above solution A and solution B in a volume ratio of 1:0.5, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40 kHz to obtain a colloidal emulsion;

[0060] S4, pouring the colloidal emulsion onto a horizontal plate for scraping, and after drying, peeling off to obtain a proton exchange membrane.

[0061] Example 5: This example provides a method for preparing a proton exchange membrane, which comprises the following steps:

[0062] S1, add 6g polyvinyl alcohol, 4g polyethylene glycol, and 0.4g dodecyltrimethylammonium chloride to 110g water, stir evenly to obtain solution A, and set aside;

[0063] S2, adding 4g of polytetrafluoroethylene, 4g of oleic acid amide, and 4g of modified carbon nanotubes to 110g of butanone, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz to obtain solution B for standby use; wherein the modified carbon nanotubes are silane coupling agent modified carbon nanotubes, and the modification method thereof is as follows: adding 10g of carbon nanotubes and 0.8g of vinyl triethoxysilane to 100mL of ethanol for ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz, then heating to remove ethanol, and performing drying treatment to obtain modified carbon nanotubes;

[0064] S3, mixing the above solution A and solution B in a volume ratio of 1:0.7, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40 kHz to obtain a colloidal emulsion;

[0065] S4, pouring the colloidal emulsion onto a horizontal plate for scraping, and after drying, peeling off to obtain a proton exchange membrane.

[0066] Example 6: This example provides a method for preparing a proton exchange membrane, which comprises the following steps:

[0067] S1. Add 5 g of polyvinyl alcohol, 2 g of polyethylene glycol, and 0.2 g of dodecyltrimethylammonium chloride to 100 g of water, stir evenly, and obtain solution A for standby use;

[0068] S2, adding 2g polytetrafluoroethylene, 1.5g oleic acid amide, and 3.5g modified carbon nanotubes to 100g butanone, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz to obtain solution B for standby use; wherein the modified carbon nanotubes are silane coupling agent modified carbon nanotubes, and the modification method thereof is as follows: adding 10g carbon nanotubes and 0.9g vinyl triethoxysilane to 100mL ethanol for ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz, then heating to remove ethanol, and performing drying treatment to obtain modified carbon nanotubes;

[0069] S3, mixing the above solution A and solution B in a volume ratio of 1:0.7, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40 kHz to obtain a colloidal emulsion;

[0070] S4, pouring the colloidal emulsion onto a horizontal plate for scraping, and after drying, peeling off to obtain a proton exchange membrane.

[0071] Example 7: This example provides a method for preparing a proton exchange membrane, which comprises the following steps:

[0072] S1. Add 6 g of polyvinyl alcohol, 4 g of polyethylene glycol, and 0.4 g of dodecyltrimethylammonium chloride to 100 g of water, stir evenly, and obtain solution A for standby use;

[0073] S2, adding 1.5g polytetrafluoroethylene, 2g oleic acid amide, and 1.5g modified carbon nanotubes to 100g butanone, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz to obtain solution B for standby use; wherein the modified carbon nanotubes are silane coupling agent modified carbon nanotubes, and the modification method thereof is as follows: adding 10g carbon nanotubes and 0.7g vinyl triethoxysilane to 100mL ethanol for ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz, then heating to remove ethanol, and performing drying treatment to obtain modified carbon nanotubes;

[0074] S3, mixing the above solution A and solution B in a volume ratio of 1:0.5, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40 kHz to obtain a colloidal emulsion;

[0075] S4, pouring the colloidal emulsion onto a horizontal plate for scraping, and after drying, peeling off to obtain a proton exchange membrane.

[0076] Embodiment 8: This embodiment provides a method for preparing a proton exchange membrane, which comprises the following steps:

[0077] S1. Add 6 g of polyvinyl alcohol, 3 g of polyethylene glycol, and 0.3 g of dodecyltrimethylammonium chloride to 100 g of water, stir evenly, and obtain solution A for standby use;

[0078] S2, adding 4g of polytetrafluoroethylene, 1g of oleic acid amide, and 2g of modified carbon nanotubes to 100g of butanone, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz to obtain solution B for standby use; wherein the modified carbon nanotubes are silane coupling agent modified carbon nanotubes, and the modification method thereof is as follows: adding 10g of carbon nanotubes and 0.8g of vinyl triethoxysilane to 100mL of ethanol for ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz, then heating to remove ethanol, and performing drying treatment to obtain modified carbon nanotubes;

[0079] S3, mixing the above solution A and solution B in a volume ratio of 1:0.6, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40 kHz to obtain a colloidal emulsion;

[0080] S4, pouring the colloidal emulsion onto a horizontal plate for scraping, and after drying, peeling off to obtain a proton exchange membrane.

[0081] Example 9: This example provides a method for preparing a proton exchange membrane, which comprises the following steps:

[0082] S1. Add 5 g of polyvinyl alcohol, 3 g of polyethylene glycol, and 0.1 g of dodecyltrimethylammonium chloride to 100 g of water, stir evenly, and obtain solution A for standby use;

[0083] S2, adding 3g of polytetrafluoroethylene, 3g of oleic acid amide, and 3g of modified carbon nanotubes to 100g of butanone, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz to obtain solution B for standby use; wherein the modified carbon nanotubes are carbon nanotubes modified by a silane coupling agent, and the modification method thereof is as follows: adding 10g of carbon nanotubes and 0.7g of vinyl triethoxysilane to 100mL of ethanol for ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz, then heating to remove ethanol, and performing drying treatment to obtain modified carbon nanotubes;

[0084] S3, mixing the above solution A and solution B in a volume ratio of 1:0.5, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40 kHz to obtain a colloidal emulsion;

[0085] S4, pouring the colloidal emulsion onto a horizontal plate for scraping, and after drying, peeling off to obtain a proton exchange membrane.

[0086] Example 10: This example provides a method for preparing a proton exchange membrane, which comprises the following steps:

[0087] S1. Add 7 g of polyvinyl alcohol, 2 g of polyethylene glycol, and 0.3 g of dodecyltrimethylammonium chloride to 100 g of water, stir evenly, and obtain solution A for standby use;

[0088] S2, adding 3g of polytetrafluoroethylene, 2g of oleic acid amide, and 2g of modified carbon nanotubes to 100g of butanone, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz to obtain solution B for standby use; wherein the modified carbon nanotubes are silane coupling agent modified carbon nanotubes, and the modification method thereof is as follows: adding 10g of carbon nanotubes and 0.8g of vinyl triethoxysilane to 100mL of ethanol for ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz, then heating to remove ethanol, and performing drying treatment to obtain modified carbon nanotubes;

[0089] S3, mixing the above solution A and solution B in a volume ratio of 1:0.5, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40 kHz to obtain a colloidal emulsion;

[0090] S4, pouring the colloidal emulsion onto a horizontal plate for scraping, and after drying, peeling off to obtain a proton exchange membrane.

[0091] Comparative Example 1: This comparative example provides a method for preparing a proton exchange membrane, which comprises the following steps:

[0092] S1. Add 5 g of polyvinyl alcohol, 3 g of polyethylene glycol, and 0.3 g of dodecyltrimethylammonium chloride to 100 g of water, stir evenly, and obtain solution A for standby use;

[0093] S2, adding 2g oleic acid amide and 3g modified carbon nanotubes to 103g butanone, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz to obtain solution B for standby use; wherein the modified carbon nanotubes are silane coupling agent modified carbon nanotubes, and the modification method thereof is as follows: adding 10g carbon nanotubes and 0.7g vinyl triethoxysilane to 100mL ethanol for ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz, then heating to remove ethanol, and performing drying treatment to obtain modified carbon nanotubes;

[0094] S3, mixing the above solution A and solution B in a volume ratio of 1:0.6, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40 kHz to obtain a colloidal emulsion;

[0095] S4, pouring the colloidal emulsion onto a horizontal plate for scraping, and after drying, peeling off to obtain a proton exchange membrane.

[0096] Comparative Example 2: This comparative example provides a method for preparing a proton exchange membrane, which comprises the following steps:

[0097] S1. Add 5 g of polyvinyl alcohol, 3 g of polyethylene glycol, and 0.3 g of dodecyltrimethylammonium chloride to 100 g of water, stir evenly, and obtain solution A for standby use;

[0098] S2, adding 3g of polytetrafluoroethylene and 3g of modified carbon nanotubes to 102g of butanone, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz to obtain solution B for standby use; wherein the modified carbon nanotubes are carbon nanotubes modified by a silane coupling agent, and the modification method thereof is as follows: adding 10g of carbon nanotubes and 0.7g of vinyltriethoxysilane to 100mL of ethanol for ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz, then heating to remove ethanol, and performing drying treatment to obtain modified carbon nanotubes;

[0099] S3, mixing the above solution A and solution B in a volume ratio of 1:0.6, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40 kHz to obtain a colloidal emulsion;

[0100] S4, pouring the colloidal emulsion onto a horizontal plate for scraping, and after drying, peeling off to obtain a proton exchange membrane.

[0101] Comparative Example 3: This comparative example provides a method for preparing a proton exchange membrane, which comprises the following steps:

[0102] S1. Add 5 g of polyvinyl alcohol, 3 g of polyethylene glycol, and 0.3 g of dodecyltrimethylammonium chloride to 100 g of water, stir evenly, and obtain solution A for standby use;

[0103] S2, adding 3g polytetrafluoroethylene and 2g oleic acid amide to 103g butanone, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz to obtain solution B for standby use;

[0104] S3, mixing the above solution A and solution B in a volume ratio of 1:0.6, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40 kHz to obtain a colloidal emulsion;

[0105] S4, pouring the colloidal emulsion onto a horizontal plate for scraping, and after drying, peeling off to obtain a proton exchange membrane.

[0106] Comparative Example 4: This comparative example provides a method for preparing a proton exchange membrane, which comprises the following steps:

[0107] S1. Add 5 g of polyvinyl alcohol, 3 g of polyethylene glycol, and 0.3 g of dodecyltrimethylammonium chloride to 100 g of water, stir evenly, and obtain solution A for standby use;

[0108] S2, adding 3 g of polytetrafluoroethylene, 2 g of oleamide, and 3 g of unmodified carbon nanotubes to 100 g of butanone, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40 kHz to obtain a solution B for standby use;

[0109] S3, mixing the above solution A and solution B in a volume ratio of 1:0.6, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40 kHz to obtain a colloidal emulsion;

[0110] S4, pouring the colloidal emulsion onto a horizontal plate for scraping, and after drying, peeling off to obtain a proton exchange membrane.

[0111] Performance test: The proton exchange membranes prepared in the above-mentioned Example 1 and Comparative Examples 1-4 were subjected to tensile strength tests under the same experimental conditions, and the comparison results are as follows: compared with Example 1, Comparative Example 1 did not add polytetrafluoroethylene, and the tensile strength of the proton exchange membrane prepared therefrom decreased by 5%; compared with Example 1, Comparative Example 2 did not add oleamide, and the tensile strength of the proton exchange membrane prepared therefrom decreased by 8%; compared with Example 1, Comparative Example 3 did not add modified carbon nanotubes, and the tensile strength of the proton exchange membrane prepared therefrom decreased by 12%; compared with Example 1, Comparative Example 4 used unmodified carbon nanotubes to replace the modified carbon nanotubes in Example 1, and the tensile strength of the proton exchange membrane prepared therefrom decreased by 9%.

[0112] In summary, the embodiments of the present invention can significantly improve the mechanical properties such as tensile strength of the proton exchange membrane by adding polytetrafluoroethylene, oleamide, modified carbon nanotubes, etc. as raw materials; in addition, the embodiments of the present invention can improve the dispersibility of carbon nanotubes in the colloidal emulsion by adding carbon nanotubes modified by silane coupling agents, thereby improving the film performance of the proton exchange membrane.

[0113] Based on the above-mentioned ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above-mentioned description. The technical scope of the present invention is not limited to the contents of the specification.

Claims

1. A method for preparing a proton exchange membrane, characterized in that: The following steps are involved: In parts by weight, 3-7 parts of polyvinyl alcohol, 1-5 parts of polyethylene glycol, and 0.1-0.5 parts of dodecyltrimethylammonium chloride are added to 80-120 parts of water to obtain solution A; According to weight parts, 1-5 parts of polytetrafluoroethylene, 1-5 parts of oleic acid amide, and 1-5 parts of modified carbon nanotubes are added to 80-120 parts of the first organic solvent, and dispersed to obtain solution B; the modified carbon nanotubes are carbon nanotubes modified by a silane coupling agent; Solution A and solution B are mixed in a certain volume ratio and dispersed to obtain a colloidal emulsion; The colloidal emulsion is poured onto a horizontal plate for scraping treatment, and after drying, it is peeled off to obtain a proton exchange membrane.

2. The method for preparing a proton exchange membrane according to claim 1, characterized in that: The first organic solvent is butanone or acetone.

3. The method for preparing a proton exchange membrane according to claim 1, characterized in that: The modification method of the modified carbon nanotubes comprises the following steps: The carbon nanotubes and the silane coupling agent are added to a second organic solvent for dispersion treatment, and then the second organic solvent is removed and a drying treatment is performed to obtain modified carbon nanotubes.

4. The method for preparing a proton exchange membrane according to claim 1 or 3, characterized in that: The dispersion treatment method is ultrasonic dispersion, and the ultrasonic frequency of ultrasonic dispersion is 30-50kHz.

5. The method for preparing a proton exchange membrane according to claim 3, characterized in that: The mass ratio of the carbon nanotubes to the silane coupling agent is 10:(0.5-1).

6. A method for preparing a proton exchange membrane according to claim 3 or 5, characterized in that: The silane coupling agent is vinyl triethoxy silane or vinyl trimethoxy silane.

7. The method for preparing a proton exchange membrane according to claim 3, characterized in that: The second organic solvent is ethanol.

8. The method for preparing a proton exchange membrane according to claim 1, characterized in that: The solution A and solution B are mixed in a volume ratio of 1:(0.4-0.8).

9. A proton exchange membrane prepared by the preparation method according to any one of claims 1 to 8.

10. A fuel cell comprising a catalyst layer, a diffusion layer and a bipolar plate, characterized in that: Also included is the proton exchange membrane of claim 9.