Perfluorosulfonic acid proton exchange membrane as well as preparation method and application thereof

Abstract

The invention discloses a perfluorosulfonic acid proton exchange membrane as well as a preparation method and application thereof, and belongs to the technical field of proton exchange membranes, the preparation method of the perfluorosulfonic acid proton exchange membrane comprises the following steps: adding perfluorosulfonic acid resin, sodium chloride, silicon dioxide, aluminum oxide and hexadecyl trimethyl ammonium chloride into an organic solvent, and stirring uniformly; carrying out dispersion treatment to obtain dispersion liquid; placing a positive plate and a negative plate in the dispersion liquid, applying direct-current voltage, and performing electrophoresis treatment to form a film on the positive plate; and separating out the membrane on the positive plate, cleaning and drying to obtain the perfluorosulfonic acid proton exchange membrane. By doping sodium chloride, silicon dioxide and aluminum oxide, the conductivity of the perfluorosulfonic acid proton exchange membrane can be remarkably improved; besides, hexadecyl trimethyl ammonium chloride is added as a surfactant in the electrophoresis treatment process, so that the formation of the membrane can be promoted, and the membrane performance of the perfluorosulfonic acid proton exchange membrane can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of proton exchange membranes, in particular to a perfluorosulfonic acid proton exchange membrane and a preparation method and application thereof. Background Art

[0002] The proton exchange membrane is the core component of the proton exchange membrane fuel cell. It not only acts as a barrier, but also conducts protons. There are many types of proton exchange membranes, among which the perfluorosulfonic acid proton exchange membrane is widely used. It is a proton exchange membrane made of perfluorosulfonic acid resin as raw material.

[0003] The existing perfluorosulfonic acid proton exchange membrane is generally prepared by melt molding and solution molding. Although the membrane forming property is good, there are problems such as low conductivity of the perfluorosulfonic acid proton exchange membrane, so it is urgently needed to be improved. Summary of the invention

[0004] The object of the present invention is to provide a perfluorosulfonic acid proton exchange membrane and a preparation method and application thereof, so as 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 perfluorosulfonic acid proton exchange membrane comprises the following steps:

[0007] Adding perfluorosulfonic acid resin, sodium chloride, silicon dioxide, aluminum oxide, and hexadecyltrimethylammonium chloride into an organic solvent and performing a dispersion treatment to obtain a dispersion;

[0008] Placing the positive electrode sheet and the negative electrode sheet in the above dispersion, applying a direct current voltage, and performing electrophoresis treatment to form a thin film on the positive electrode sheet;

[0009] The film on the positive electrode sheet is separated, cleaned and dried to obtain a perfluorosulfonic acid proton exchange membrane.

[0010] Preferably, the mass ratio of the perfluorosulfonic acid resin, sodium chloride, silicon dioxide, aluminum oxide, hexadecyltrimethylammonium chloride and organic solvent is (5-15):(1-5):(0.5-2):(0.5-2):(0.1-0.5):(100-150).

[0011] Preferably, the organic solvent is dimethylformamide and / or dimethyl sulfoxide.

[0012] Preferably, the dispersion treatment method is ultrasonic dispersion, and the ultrasonic frequency of the ultrasonic dispersion is 30-50 kHz.

[0013] Preferably, the distance between the positive electrode sheet and the negative electrode sheet is 5-15 mm.

[0014] Preferably, the positive electrode sheet is a platinum sheet.

[0015] Preferably, the negative electrode sheet is a graphite sheet.

[0016] Preferably, the applied DC voltage is 6-10V.

[0017] Another object of the embodiment of the present invention is to provide a perfluorosulfonic acid proton exchange membrane prepared by the above preparation method.

[0018] Another object of the embodiment of the present invention is to provide an application of the above-mentioned perfluorosulfonic acid proton exchange membrane in a fuel cell.

[0019] The invention provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which adopts an electrophoresis process for membrane formation. The invention can significantly improve the conductivity of the perfluorosulfonic acid proton exchange membrane by doping sodium chloride, silicon dioxide and aluminum oxide. In addition, the invention can promote the formation of the film and improve the film performance of the perfluorosulfonic acid proton exchange membrane by adding hexadecyltrimethylammonium chloride as a surfactant during the electrophoresis treatment process. DETAILED DESCRIPTION

[0020] 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.

[0021] In one embodiment of the present invention, a method for preparing a perfluorosulfonic acid proton exchange membrane is provided, which comprises the following steps:

[0022] S1. Add 5-15 parts of perfluorosulfonic acid resin, 1-5 parts of sodium chloride, 0.5-2 parts of silicon dioxide, 0.5-2 parts of aluminum oxide, and 0.1-0.5 parts of hexadecyltrimethylammonium chloride to 100-150 parts of an organic solvent, and perform dispersion treatment to obtain a dispersion;

[0023] S2, placing the positive electrode sheet and the negative electrode sheet in the above dispersion, applying a DC voltage, and performing electrophoresis treatment to form a thin film on the positive electrode sheet;

[0024] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0025] Wherein, the mass ratio of perfluorosulfonic acid resin, sodium chloride, silicon dioxide, aluminum oxide, hexadecyltrimethylammonium chloride and organic solvent is (5-15): (1-5): (0.5-2): (0.5-2): (0.1-0.5): (100-150). Perfluorosulfonic acid resin (Nafion-H) is a solid superacid, which can generally be prepared by copolymerizing perfluorovinyl ether monomer with sulfonic acid group with tetrafluoroethylene, and has excellent heat resistance and high chemical stability and mechanical strength. In the embodiment of the present invention, perfluorosulfonic acid resin can be commercially available.

[0026] In a preferred embodiment of the present invention, the mass ratio of perfluorosulfonic acid resin, sodium chloride, silica, aluminum oxide, hexadecyltrimethylammonium chloride and organic solvent is (8-12):(2-4):(1-1.5):(1-1.5):(0.2-0.4):(120-140); preferably, the mass ratio of perfluorosulfonic acid resin, sodium chloride, silica, aluminum oxide, hexadecyltrimethylammonium chloride and organic solvent is 10:3:1.2:1.2:0.3:130.

[0027] In a preferred embodiment of the present invention, the organic solvent is dimethylformamide and / or dimethyl sulfoxide; of course, other organic solvents that can evenly disperse raw materials such as perfluorosulfonic acid resin, sodium chloride, silicon dioxide, aluminum oxide, etc. can also be used, but are not limited thereto.

[0028] In a preferred embodiment of the present invention, the dispersion treatment method is ultrasonic dispersion, and the ultrasonic frequency of the ultrasonic dispersion is 30-50 kHz.

[0029] In a preferred embodiment of the present invention, the distance between the positive electrode sheet and the negative electrode sheet is 5-15 mm.

[0030] In a preferred embodiment of the present invention, the positive electrode sheet is a platinum sheet, and the negative electrode sheet is a graphite sheet. It should be noted that the positive electrode sheet and the negative electrode sheet may also be made of other conductive materials, and are not limited thereto.

[0031] In a preferred embodiment of the present invention, the applied DC voltage is 6-10V.

[0032] In another embodiment of the present invention, there is also provided an application of the above-mentioned perfluorosulfonic acid proton exchange membrane in a fuel cell.

[0033] In the embodiments of the present invention, the conductivity of the perfluorosulfonic acid proton exchange membrane can be significantly improved by doping with sodium chloride, silicon dioxide, and aluminum oxide; in addition, the present invention adopts an electrophoresis process for film formation, which has a simple process and high film forming efficiency. Moreover, the present invention also promotes the formation of the film and improves the film performance of the perfluorosulfonic acid proton exchange membrane by adding hexadecyltrimethylammonium chloride as a surfactant during the electrophoresis treatment.

[0034] The following embodiments are some specific implementation cases of the present invention in practical applications, but are not limited thereto.

[0035] Example 1: This example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0036] S1, adding 10g of perfluorosulfonic acid resin, 3g of sodium chloride, 1.2g of silicon dioxide, 1.2g of aluminum oxide, and 0.3g of hexadecyltrimethylammonium chloride to 130g of dimethylformamide, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz to obtain a dispersion;

[0037] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 10 mm, apply a DC voltage of 8 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0038] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0039] Example 2: This example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0040] S1, adding 5g of perfluorosulfonic acid resin, 1g of sodium chloride, 0.5g of silicon dioxide, 0.5g of aluminum oxide, and 0.1g of hexadecyltrimethylammonium chloride to 100g of dimethyl sulfoxide, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 30kHz to obtain a dispersion;

[0041] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 5 mm, apply a DC voltage of 6 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0042] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0043] Example 3: This example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0044] S1, adding 15g of perfluorosulfonic acid resin, 5g of sodium chloride, 2g of silicon dioxide, 2g of aluminum oxide, and 0.5g of hexadecyltrimethylammonium chloride to 150g of dimethyl sulfoxide, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 50kHz to obtain a dispersion;

[0045] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 15 mm, apply a DC voltage of 10 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0046] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0047] Example 4: This example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0048] S1, adding 15g of perfluorosulfonic acid resin, 1g of sodium chloride, 0.5g of silicon dioxide, 0.5g of aluminum oxide, and 0.1g of hexadecyltrimethylammonium chloride to 100g of dimethylformamide, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 30kHz to obtain a dispersion;

[0049] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 5 mm, apply a DC voltage of 6 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0050] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0051] Example 5: This example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0052] S1, adding 8 g of perfluorosulfonic acid resin, 2 g of sodium chloride, 1 g of silicon dioxide, 1 g of aluminum oxide, and 0.2 g of hexadecyltrimethylammonium chloride to 120 g of dimethylformamide, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 35 kHz to obtain a dispersion;

[0053] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 8 mm, apply a DC voltage of 7 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0054] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0055] Example 6: This example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0056] S1, adding 12g of perfluorosulfonic acid resin, 4g of sodium chloride, 1.5g of silicon dioxide, 1.5g of aluminum oxide, and 0.4g of hexadecyltrimethylammonium chloride to 140g of dimethylformamide, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 45kHz to obtain a dispersion;

[0057] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 12 mm, apply a DC voltage of 9 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0058] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0059] Example 7: This example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0060] S1, adding 7g of perfluorosulfonic acid resin, 2g of sodium chloride, 1g of silicon dioxide, 2g of aluminum oxide, and 0.2g of hexadecyltrimethylammonium chloride to 100g of dimethylformamide, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 30kHz to obtain a dispersion;

[0061] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 6 mm, apply a DC voltage of 6 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0062] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0063] Example 8: This example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0064] S1, adding 11 g of perfluorosulfonic acid resin, 2 g of sodium chloride, 1 g of silicon dioxide, 1.5 g of aluminum oxide, and 0.5 g of hexadecyltrimethylammonium chloride to 150 g of dimethylformamide and / or dimethyl sulfoxide, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 50 kHz to obtain a dispersion;

[0065] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 12 mm, apply a DC voltage of 8 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0066] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0067] Example 9: This example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0068] S1, adding 9 g of perfluorosulfonic acid resin, 2 g of sodium chloride, 1.5 g of silicon dioxide, 1 g of aluminum oxide, and 0.3 g of hexadecyltrimethylammonium chloride to 110 g of dimethylformamide and / or dimethyl sulfoxide, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 30 kHz to obtain a dispersion;

[0069] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 10 mm, apply a DC voltage of 8 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0070] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0071] Example 10: This example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0072] S1, adding 10g of perfluorosulfonic acid resin, 1g of sodium chloride, 2g of silicon dioxide, 0.5g of aluminum oxide, and 0.5g of hexadecyltrimethylammonium chloride to 100g of dimethyl sulfoxide, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 50kHz to obtain a dispersion;

[0073] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 10 mm, apply a DC voltage of 8 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0074] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0075] Example 11: This example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0076] S1, adding 14g of perfluorosulfonic acid resin, 1g of sodium chloride, 0.5g of silicon dioxide, 2g of aluminum oxide, and 0.1g of hexadecyltrimethylammonium chloride to 120g of dimethylformamide, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz to obtain a dispersion;

[0077] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 10 mm, apply a DC voltage of 8 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0078] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0079] Example 12: This example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0080] S1, adding 10g of perfluorosulfonic acid resin, 2g of sodium chloride, 0.8g of silicon dioxide, 1.2g of aluminum oxide, and 0.3g of hexadecyltrimethylammonium chloride to a mixed solvent of 60g of dimethylformamide and 60g of dimethyl sulfoxide, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz to obtain a dispersion;

[0081] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 10 mm, apply a DC voltage of 8 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0082] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0083] Example 13: This example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0084] S1, adding 12g of perfluorosulfonic acid resin, 4g of sodium chloride, 1.8g of silicon dioxide, 1.2g of aluminum oxide, and 0.4g of hexadecyltrimethylammonium chloride to 135g of dimethylformamide, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz to obtain a dispersion;

[0085] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 10 mm, apply a DC voltage of 8 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0086] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0087] Example 14: This example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0088] S1, adding 9 g of perfluorosulfonic acid resin, 3 g of sodium chloride, 1 g of silicon dioxide, 1 g of aluminum oxide, and 0.2 g of hexadecyltrimethylammonium chloride to 120 g of dimethylformamide, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 30 kHz to obtain a dispersion;

[0089] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 12 mm, apply a DC voltage of 8 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0090] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0091] Example 15: This example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0092] S1, adding 8 g of perfluorosulfonic acid resin, 2 g of sodium chloride, 0.5 g of silicon dioxide, 1.5 g of aluminum oxide, and 0.2 g of hexadecyltrimethylammonium chloride to 100 g of dimethylformamide, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 30 kHz to obtain a dispersion;

[0093] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 12 mm, apply a DC voltage of 8 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0094] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0095] Comparative Example 1: This comparative example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0096] S1, adding 10g of perfluorosulfonic acid resin, 3g of sodium chloride, 2.4g of aluminum oxide, and 0.3g of hexadecyltrimethylammonium chloride to 130g of dimethylformamide, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz to obtain a dispersion;

[0097] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 10 mm, apply a DC voltage of 8 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0098] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0099] Comparative Example 2: This comparative example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0100] S1, adding 10g of perfluorosulfonic acid resin, 3g of sodium chloride, 2.4g of silicon dioxide, and 0.3g of hexadecyltrimethylammonium chloride to 130g of dimethylformamide, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz to obtain a dispersion;

[0101] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 10 mm, apply a DC voltage of 8 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0102] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0103] Comparative Example 3: This comparative example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0104] S1, adding 10g of perfluorosulfonic acid resin, 1.2g of silicon dioxide, 1.2g of aluminum oxide, and 0.3g of hexadecyltrimethylammonium chloride to 133g of dimethylformamide, and performing ultrasonic dispersion treatment at an ultrasonic frequency of 40kHz to obtain a dispersion;

[0105] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 10 mm, apply a DC voltage of 8 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0106] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0107] Comparative Example 4: This comparative example provides a method for preparing a perfluorosulfonic acid proton exchange membrane, which comprises the following steps:

[0108] S1. Add 10 g of perfluorosulfonic acid resin and 0.3 g of hexadecyltrimethylammonium chloride to 135.4 g of dimethylformamide, and perform ultrasonic dispersion treatment at an ultrasonic frequency of 40 kHz to obtain a dispersion;

[0109] S2. Select a platinum sheet as the positive electrode sheet and a graphite sheet as the negative electrode sheet; place the positive electrode sheet and the negative electrode sheet in the above dispersion, keep the distance between the positive electrode sheet and the negative electrode sheet at 10 mm, apply a DC voltage of 8 V, and perform electrophoresis treatment to form a thin film on the positive electrode sheet;

[0110] S3. Separate the thin film on the positive electrode sheet, clean and dry it, and obtain a perfluorosulfonic acid proton exchange membrane.

[0111] Performance test: The conductivity of the perfluorosulfonic acid proton exchange membranes prepared in the above Examples 1-15 was tested by impedance method, and the results were 0.35-0.42 S / cm, which was significantly improved compared with conventional perfluorosulfonic acid proton exchange membranes available on the market. In addition, the conductivity of the perfluorosulfonic acid proton exchange membrane prepared in the above-mentioned Example 1 was compared with the perfluorosulfonic acid proton exchange membranes prepared in Comparative Examples 1-4, and the results were as follows: compared with Example 1, Comparative Example 1 did not add silicon dioxide, and the conductivity of the perfluorosulfonic acid proton exchange membrane obtained thereby decreased by 8%; compared with Example 1, Comparative Example 2 did not add aluminum oxide, and the conductivity of the perfluorosulfonic acid proton exchange membrane obtained thereby decreased by 9%; compared with Example 1, Comparative Example 3 did not add sodium chloride, and the conductivity of the perfluorosulfonic acid proton exchange membrane obtained thereby decreased by 13%; compared with Example 1, Comparative Example 3 did not add sodium chloride, silicon dioxide and aluminum oxide, and the conductivity of the perfluorosulfonic acid proton exchange membrane obtained thereby decreased by 32%.

[0112] In summary, in the embodiment of the present invention, sodium chloride, silicon dioxide and aluminum oxide are doped during the preparation process of the perfluorosulfonic acid proton exchange membrane. Under the synergistic effect of sodium chloride, silicon dioxide and aluminum oxide, the conductivity of the perfluorosulfonic acid proton exchange membrane can be significantly improved.

[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 perfluorosulfonic acid proton exchange membrane, characterized in that: The following steps are involved: Adding perfluorosulfonic acid resin, sodium chloride, silicon dioxide, aluminum oxide, and hexadecyltrimethylammonium chloride into an organic solvent and performing a dispersion treatment to obtain a dispersion; Placing the positive electrode sheet and the negative electrode sheet in the above dispersion, applying a direct current voltage, and performing electrophoresis treatment to form a thin film on the positive electrode sheet; The film on the positive electrode sheet is separated, cleaned and dried to obtain a perfluorosulfonic acid proton exchange membrane.

2. The method for preparing a perfluorosulfonic acid proton exchange membrane according to claim 1, characterized in that: The mass ratio of the perfluorosulfonic acid resin, sodium chloride, silicon dioxide, aluminum oxide, hexadecyltrimethylammonium chloride and organic solvent is (5-15):(1-5):(0.5-2):(0.5-2):(0.1-0.5):(100-150).

3. A method for preparing a perfluorosulfonic acid proton exchange membrane according to claim 1 or 2, characterized in that: The organic solvent is dimethylformamide and / or dimethyl sulfoxide.

4. The method for preparing a perfluorosulfonic acid proton exchange membrane according to claim 1, 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 perfluorosulfonic acid proton exchange membrane according to claim 1, characterized in that: The distance between the positive electrode sheet and the negative electrode sheet is 5-15 mm.

6. A method for preparing a perfluorosulfonic acid proton exchange membrane according to claim 1 or 5, characterized in that: The positive electrode sheet is a platinum sheet.

7. The method for preparing a perfluorosulfonic acid proton exchange membrane according to claim 1 or 5, characterized in that: The negative electrode sheet is a graphite sheet.

8. The method for preparing a perfluorosulfonic acid proton exchange membrane according to claim 1, characterized in that: The applied DC voltage is 6-10V.

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

10. Use of the perfluorosulfonic acid proton exchange membrane as claimed in claim 9 in a fuel cell.