Method for preparing catalyst coating film
By setting an imprint pattern on the protective film and using the hot press roller to transfer heat and pressure, the cost and efficiency problems of replacing the hot press roller when preparing the catalyst coating films of different shapes and sizes in the prior art are solved, and fast and low Cost of catalyst coating film preparation.
Patent Information
- Application Number
- CN202310755111.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-25
- Publication Date
- 2024-12-27
AI Technical Summary
The prior art When preparing catalyst coating films of different shapes and sizes, it is necessary to replace multiple models of hot pressing rollers, which increases costs and reduces production efficiency.
The first protective film and the second protective film have an imprint pattern, and heat and pressure are transferred through the first and second hot press rollers, so that the anode catalytic layer and the catalytic layer form a shape transfer corresponding to the imprint pattern. On the proton exchange membrane, catalyst coating film preparation of different shapes and sizes is realized, avoiding the need to replace the hot pressing roller.
It realizes the rapid and convenient preparation of catalyst coating films of different shapes and sizes, reducing costs and improving efficiency.
Smart Images
Figure CN119208625A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of fuel cell membrane electrode, and in particular relates to a method for preparing a catalyst coating membrane. Background Art
[0002] The membrane electrode is the core component of the proton exchange membrane fuel cell. The catalyst layer is combined with the proton exchange membrane to prepare a catalyst coated membrane (CCM), and then the CCM is bonded to the gas diffusion layer to prepare a membrane electrode. The membrane electrode of this structure can improve the performance of the membrane electrode of the proton exchange membrane fuel cell. At present, one of the preparation methods of CCM is to first coat the catalyst slurry on an inert substrate to form a catalyst layer, and then transfer the catalyst layer to the proton exchange membrane by high-temperature hot pressing. If it is necessary to prepare CCMs of different shapes, it is necessary to match multiple types of hot pressing rollers for intermittent transfer, which increases costs. At the same time, replacing hot pressing rollers will also reduce production efficiency. Summary of the invention
[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one object of the present invention is to provide a method for preparing a catalyst coated membrane. The method can be used to quickly and conveniently prepare catalyst coated membranes of different shapes and sizes with low cost and high efficiency.
[0004] In one aspect of the present invention, the present invention provides a method for preparing a catalyst coating membrane. According to an embodiment of the present invention, the method comprises:
[0005] (1) forming an anode catalyst layer on the first substrate film and forming a cathode catalyst layer on the second substrate film;
[0006] (2) stacking the first protective membrane, the first base membrane, the anode catalyst layer, the proton exchange membrane, the cathode catalyst layer, the second base membrane, and the second protective membrane in this order and placing them between a first hot pressing roller and a second hot pressing roller for hot pressing;
[0007] The first protective film and the second protective film have embossed patterns thereon, the width of the first protective film is greater than the width of the anode catalyst layer, and the width of the second protective film is greater than the width of the cathode catalyst layer.
[0008] According to the method for preparing a catalyst coating membrane of the above embodiment of the present invention, first, an anode catalyst layer is formed on the first base membrane, and a cathode catalyst layer is formed on the second base membrane, and then the first protective membrane, the first base membrane, the anode catalyst layer, the proton exchange membrane, the cathode catalyst layer, the second base membrane, and the second protective membrane are stacked and placed between the first hot pressing roller and the second hot pressing roller for hot pressing. Heat and pressure are transferred to the first protective membrane and the second protective membrane by the first hot pressing roller and the second hot pressing roller. Because the first protective membrane and the second protective membrane have an embossed pattern, and the width of the first protective membrane is greater than the width of the anode catalyst layer, and the width of the second protective membrane is greater than the width of the cathode catalyst layer, the first base membrane, the anode catalyst layer, the second base membrane and the cathode catalyst layer receive heat and pressure from the first protective membrane and the second protective membrane, so that the anode catalyst layer and the cathode catalyst layer form a shape corresponding to the embossed pattern and are transferred to the proton exchange membrane. By adjusting the embossed pattern on the first protective membrane and the second protective membrane, catalyst coating membranes of different shapes and sizes can be prepared. Compared with replacing hot pressing rollers of different models, using the first protective membrane and the second protective membrane is more convenient. Therefore, the method can be used to quickly and conveniently prepare catalyst-coated membranes of different shapes and sizes with low cost and high efficiency.
[0009] In addition, the method for preparing a catalyst coated membrane according to the above embodiment of the present invention may also have the following technical features:
[0010] In some embodiments of the present invention, the embossed pattern includes hollow holes or convex patterns, and the shapes or numbers of the hollow holes and the convex patterns are designed according to the catalyst coated membranes of different shapes and sizes. Thus, catalyst coated membranes of different shapes or sizes can be prepared.
[0011] In some embodiments of the present invention, the materials of the first protective film and the second protective film independently include PET resin, polyethylene naphthalate or polyphenylene sulfide.
[0012] In some embodiments of the present invention, the thickness of the first protective film and the second protective film is independently 50 μm-200 μm. Thus, catalyst coated membranes of different shapes or sizes can be prepared.
[0013] In some embodiments of the present invention, the temperature of the hot pressing is 80° C.-200° C., and the pressure is 0.9 MPa-2.0 MPa. Thus, catalyst coated membranes of different shapes or sizes can be prepared.
[0014] In some embodiments of the present invention, the rotation speed of the first hot-pressing roller and the second hot-pressing roller is 0.2 m / min-0.8 m / min. Thus, catalyst coated membranes of different shapes or sizes can be prepared.
[0015] In some embodiments of the present invention, the thickness of the anode catalyst layer is 1 μm-15 μm.
[0016] In some embodiments of the present invention, the cathode catalyst layer has a thickness of 5 μm-30 μm.
[0017] In some embodiments of the present invention, the protrusion height of the protrusion pattern is 50 μm-200 μm. Thus, catalyst coating membranes of different shapes or sizes can be prepared.
[0018] In some embodiments of the present invention, the materials of the first substrate film and the second substrate film independently include polytetrafluoroethylene or a polytetrafluoroethylene composite material.
[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0021] Figure 1 is a hot pressing process diagram for preparing a catalyst coated membrane according to an embodiment of the present invention;
[0022] Figure 2 is a schematic diagram of a hollow hole in an embodiment of the present invention;
[0023] Figure 3 is a schematic diagram of a convex pattern according to an embodiment of the present invention;
[0024] Figure 4 The shape of the hollow hole 1 and the shape of the obtained CCM in the embodiment of the present invention;
[0025] Figure 5 It is the shape of the two hollow holes and the shape of the obtained CCM in the embodiment of the present invention. DETAILED DESCRIPTION
[0026] The embodiments of the present invention are described in detail below, which are intended to explain the present invention but should not be construed as limiting the present invention.
[0027] In one aspect of the present invention, the present invention provides a method for preparing a catalyst coated membrane. According to an embodiment of the present invention, the method comprises:
[0028] S100: forming an anode catalyst layer on the first substrate film, and forming a cathode catalyst layer on the second substrate film
[0029] In this step, an anode catalyst slurry and a cathode catalyst slurry are prepared, and then the anode catalyst slurry is coated on the first substrate membrane, and the cathode catalyst slurry is coated on the second substrate membrane, thereby forming an anode catalyst layer on one side of the first substrate membrane and a cathode catalyst layer on one side of the second substrate membrane. Furthermore, the thickness of the anode catalyst layer is 1μm-15μm; the thickness of the cathode catalyst layer is 5μm-30μm. It should be noted that the anode catalyst and the cathode catalyst are conventional catalysts in the art, and those skilled in the art can select them according to actual conditions. The first substrate membrane and the second substrate membrane are conventional materials used for transfer preparation of CCM, for example, the materials of the first substrate membrane and the second substrate membrane independently include polytetrafluoroethylene or polytetrafluoroethylene composite materials. Specifically, an anode catalyst, a perfluorosulfonic acid resin and an alcohol are mixed to prepare an anode catalyst slurry, and a cathode catalyst, a perfluorosulfonic acid resin and an alcohol are mixed to prepare a cathode catalyst slurry. The anode catalyst slurry is then coated on a first substrate membrane and placed in an oven for drying at 50-80°C for 5-10 minutes, thereby forming an anode catalyst layer on the first substrate membrane. The cathode catalyst slurry is coated on a second substrate membrane and placed in an oven for drying at 50-80°C for 5-10 minutes, thereby forming a cathode catalyst layer on the second substrate membrane.
[0030] S200: The first protective film, the first base film, the anode catalyst layer, the proton exchange membrane, the cathode catalyst layer, the second base film, and the second protective film are stacked in order and placed between the first hot pressing roller and the second hot pressing roller for hot pressing.
[0031] In this step, refer to Figure 1The first protective film 100, the first base film 200, the anode catalyst layer 300, the proton exchange membrane 400, the cathode catalyst layer 500, the second base film 600, and the second protective film 700 are stacked and placed between the first hot pressing roller 10 and the second hot pressing roller 20 for hot pressing. The heat and pressure are transferred to the first protective film 100 and the second protective film 700 by the first hot pressing roller 10 and the second hot pressing roller 20. Because the first protective film 100 and the second protective film 700 have embossed patterns, and the width of the first protective film 100 is greater than the width of the anode catalyst layer 300, and the width of the second protective film 700 is greater than the width of the cathode catalyst layer 500, the first base film 200, the anode catalyst layer 300, the second base film 600, and the cathode catalyst layer 500 receive heat and pressure from the first protective film 100 and the second protective film 700, so that the anode catalyst layer 300 and the cathode catalyst layer 500 form a shape corresponding to the embossed pattern and are transferred to the proton exchange membrane 400. By adjusting the embossing patterns on the first protective film 100 and the second protective film 700, catalyst coating films of different shapes and sizes can be prepared. Compared with replacing hot pressing rollers of different models, using the first protective film 100 and the second protective film 700 is more convenient. It should be noted that the first protective film 100 and the second protective film 700 only need to be hard, stable, and uniform in heat conduction. Those skilled in the art can select the specific materials of the first protective film 100 and the second protective film 700 according to actual conditions. For example, the materials of the first protective film 100 and the second protective film 700 independently include PET resin, polyethylene naphthalate, or polyphenylene sulfide.
[0032] According to an embodiment of the present invention, referring to Figure 2 and Figure 3 , the embossed pattern includes hollow holes 30 or raised patterns 40, and the shapes or numbers of the hollow holes 30 and the raised patterns 40 are designed according to the catalyst coated membranes of different shapes and sizes. If the embossed pattern is a hollow hole, during hot pressing, the position of the hollow hole does not transfer heat and pressure to the anode catalyst layer or the cathode catalyst layer, so the catalyst layer corresponding to the position of the hollow hole is not transferred to the proton exchange membrane, and the catalyst layer in other areas except the hollow hole is transferred to the proton exchange membrane. If the embossed pattern is a raised pattern, the area of the raised pattern transfers heat and pressure to the anode catalyst layer or the cathode catalyst layer during hot pressing, and the catalyst layer in the area corresponding to the raised pattern is transferred to the proton exchange membrane; other areas outside the raised pattern cannot transfer heat and pressure to the catalyst layer because there is a certain gap between the base membrane, and thus the catalyst layer in the corresponding area cannot be transferred to the proton exchange membrane. Thus, by setting hollow holes or raised patterns of different shapes and numbers, catalyst coated membranes of different shapes or sizes are prepared.
[0033] According to an embodiment of the present invention, the thickness of the first protective film 100 and the second protective film 700 are independently 50μm-200μm. The inventors found that the thickness of the first protective film 100 and the second protective film 700 cannot be too large, otherwise it will affect the heat transfer, increase energy consumption, and the catalytic layer may not be fully transferred; the thickness of the first protective film 100 and the second protective film 700 cannot be too small, otherwise the pressure difference is not obvious, and catalyst-coated films of different shapes or sizes cannot be prepared. Therefore, the present application adopts a first protective film 100 and a second protective film 700 with a thickness of 50μm-200μm, and catalyst-coated films of different shapes or sizes can be prepared. Furthermore, the protrusion height of the protrusion pattern is 50μm-200μm.
[0034] According to an embodiment of the present invention, the temperature of hot pressing is 80°C-200°C, and the pressure is 0.9MPa-2.0MPa. The inventors found that if the temperature of hot pressing is too low or the pressure is too small, the catalyst layer cannot be completely transferred to the proton exchange membrane; if the temperature of hot pressing is too high or the pressure is too high, the catalyst layer structure may be destroyed, and energy consumption will be wasted and costs will be increased. Therefore, the present application adopts hot pressing conditions of 80°C-200°C and pressure of 0.9MPa~2.0MPa to prepare catalyst coated membranes of different shapes or sizes.
[0035] According to an embodiment of the present invention, the rotation speed of the first hot pressing roller and the second hot pressing roller is 0.2m / min-0.8m / min. The inventor found that if the rotation speed of the first hot pressing roller and the second hot pressing roller is too fast, the catalyst coating film formed by transfer is uneven; if the rotation speed of the first hot pressing roller and the second hot pressing roller is too slow, the production efficiency is affected. Therefore, the present application adopts the first hot pressing roller and the second hot pressing roller with a rotation speed of 0.2m / min-0.8m / min for hot pressing, and catalyst coating films of different shapes or sizes can be prepared.
[0036] The present invention is described below with reference to specific embodiments. It should be noted that these embodiments are merely illustrative and do not limit the present invention in any way.
[0037] Example 1
[0038] The width of the anode catalyst layer on the first substrate membrane is 20 cm, and the thickness of the anode catalyst layer is 5 μm; the width of the cathode catalyst layer on the second substrate membrane is 20 cm, and the thickness of the cathode catalyst layer is 10 μm. The width of the first protective film and the second protective film is 30 cm, and the thickness is 100 μm. Figure 4, there are 6 equilateral triangular hollow holes 31 with a length of 8 cm in the first protective film and the second protective film, and then the first protective film, the first base film, the anode catalyst layer, the proton exchange membrane 400, the cathode catalyst layer, the second base film, and the second protective film are stacked in the order of the first hot pressing roller and the second hot pressing roller for hot pressing, the speed of the first hot pressing roller and the second hot pressing roller is 0.5m / min, the hot pressing temperature is 150℃, and the pressure is 1.5MPa. After transfer, two rhombus-shaped and two pentagonal CCMs are obtained.
[0039] Example 2
[0040] The width of the anode catalyst layer on the first substrate membrane is 20 cm, and the thickness of the anode catalyst layer is 6 μm; the width of the cathode catalyst layer on the second substrate membrane is 20 cm, and the thickness of the cathode catalyst layer is 10 μm. The width of the first protective membrane and the second protective membrane are 30 cm and the thickness is 120 μm. Figure 5 , there are 5 rectangular hollow holes 32 with a length of 20 cm and a width of 3 cm in the first protective film and the second protective film, which are distributed vertically, horizontally, vertically, horizontally, and vertically respectively, and then the first protective film, the first base film, the anode catalyst layer, the proton exchange membrane 400, the cathode catalyst layer, the second base film, and the second protective film are stacked in the order of the first hot pressing roller and the second hot pressing roller for hot pressing. The speed of the first hot pressing roller and the second hot pressing roller is 0.5 m / min, the hot pressing temperature is 145°C, and the pressure is 1.5 MPa. After transfer, 4 rectangular CCMs are obtained.
[0041] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0042] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.
Claims
1. A method for preparing a catalyst coated membrane, characterized in that: include: (1) forming an anode catalyst layer on the first substrate film and forming a cathode catalyst layer on the second substrate film; (2) stacking the first protective membrane, the first base membrane, the anode catalyst layer, the proton exchange membrane, the cathode catalyst layer, the second base membrane, and the second protective membrane in this order and placing them between a first hot pressing roller and a second hot pressing roller for hot pressing; The first protective film and the second protective film have embossed patterns thereon, the width of the first protective film is greater than the width of the anode catalyst layer, and the width of the second protective film is greater than the width of the cathode catalyst layer.
2. The method according to claim 1, characterized in that The embossed pattern includes hollow holes or convex patterns, and the shapes or quantities of the hollow holes and the convex patterns are designed according to the catalyst coated membranes of different shapes and sizes.
3. The method according to claim 1 or 2, characterized in that: The materials of the first protective film and the second protective film independently include PET resin, polyethylene naphthalate or polyphenylene sulfide.
4. The method according to claim 1 or 2, characterized in that: The thickness of the first protective film and the second protective film are independently 50 μm-200 μm.
5. The method according to claim 1 or 2, characterized in that: In step (2), the temperature of the hot pressing is 80°C-200°C, and the pressure is 0.9MPa-2.0MPa.
6. The method according to claim 1 or 2, characterized in that: In step (2), the rotation speed of the first hot pressing roller and the second hot pressing roller is 0.2m / min-0.8m / min.
7. The method according to claim 1 or 2, characterized in that: The thickness of the anode catalyst layer is 1 μm-15 μm.
8. The method according to claim 1 or 2, characterized in that: The thickness of the cathode catalyst layer is 5 μm-30 μm.
9. The method according to claim 2, characterized in that: The protrusion height of the protrusion pattern is 50 μm-200 μm.
10. The method according to claim 1, characterized in that The materials of the first substrate film and the second substrate film independently include polytetrafluoroethylene or a polytetrafluoroethylene composite material.