Method and equipment for preparing electrolyzed water membrane electrode

Abstract

The invention discloses an electrolytic water membrane electrode preparation method and equipment, and the method comprises the steps: arranging an adjusting mechanism, and adjusting and limiting the position of a PEM membrane through the adjusting mechanism; an ink jet mechanism is arranged, and ink jet is conducted on the surface of the PEM film through the ink jet mechanism; a drying mechanism is arranged, and the inkjet PEM film is dried through the drying mechanism; and a pressing roller is arranged, and the dried PEM film is rolled. Customized ink-jet printing and a CCM coating preparation process are combined, a PEM film is not prone to distortion and deformation by arranging the adjusting mechanism, the device can adapt to PEM films of different shapes and sizes by adopting an ink-jet mode, material consumption can be reduced, meanwhile, products can be customized, production is flexible, roll-to-roll large-scale production can be achieved, and the production efficiency is improved. And rapid production of the sheet stock can be realized, and the process is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of water electrolysis, and in particular to a method and equipment for preparing a water electrolysis membrane electrode. Background Art

[0002] The membrane electrode is the place where the proton exchange membrane water electrolysis reaction occurs. In addition to having high ion conductivity, the electrochemical stability of the proton exchange membrane is also a factor that must be considered. This is because the stability of the proton exchange membrane directly determines the long-term operating life of the fuel cell and SPE water electrolysis cell.

[0003] In the prior art, the preparation of electrolytic water membrane electrodes is mostly carried out by coating and transfer. The coating preparation is mostly carried out by ultrasonic spraying, scraping, extrusion coating and the like. Such preparation has the following disadvantages, for example: 1. The transfer efficiency is slow, the process is complicated, and the CCM is easily distorted; 2. The size and shape cannot be customized; 3. It is only suitable for large-scale mass production, and the loss of small-scale production is very high. In this regard, the present application proposes a method and equipment for preparing electrolytic water membrane electrodes to solve such problems. Summary of the invention

[0004] Based on this, in order to solve the problems existing in the prior art, on the one hand, the present application provides a method for preparing a water electrolysis membrane electrode, comprising:

[0005] An adjustment mechanism is provided to adjust and limit the position of the PEM membrane through the adjustment mechanism;

[0006] An inkjet mechanism is provided to spray ink on the surface of the PEM membrane;

[0007] A drying mechanism is provided to dry the PEM membrane after inkjet printing.

[0008] Furthermore, after the drying mechanism dries the PEM membrane after inkjet printing, the steps further include:

[0009] A pressing roller is provided to roll the dried PEM membrane.

[0010] Furthermore, the inkjet mechanism includes an ink chamber, piezoelectric ceramics and a plurality of nozzles. The ink chamber is connected to the nozzles. The piezoelectric ceramics are arranged above the nozzles. When ink is sprayed, the ink is subjected to instantaneous high-speed squeezing through the piezoelectric ceramics and is ejected from the nozzles.

[0011] Furthermore, a sensor is arranged on one side of the outer wall of the ink chamber close to the surface of the PEM membrane.

[0012] Furthermore, the inkjet mechanism, the drying mechanism and the pressure roller are each provided in two groups, and are respectively located on both sides of the PEM membrane.

[0013] Further, the ink is a catalyst ink, and the ink includes an anode ink and a cathode ink.

[0014] On the other hand, the present application provides a water electrolysis membrane electrode preparation device, which is applied to any of the above water electrolysis membrane electrode preparation methods, comprising:

[0015] Unwinding reel, which is used for unwinding PEM membrane;

[0016] A processing area, which is arranged between the unwinding reel and the receiving reel and at least one processing area is arranged, and the processing area processes the PEM film unwinding from the unwinding reel;

[0017] The take-up reel is used to take up the processed PEM membrane.

[0018] Furthermore, the processing area includes an adjustment mechanism, a traction roller, an inkjet mechanism, a drying mechanism and a pressure roller, and the adjustment mechanism, the traction roller, the inkjet mechanism, the drying mechanism and the pressure roller are arranged in sequence in the processing area.

[0019] Furthermore, the traction roller, the inkjet mechanism, the drying mechanism and the pressure roller are each provided with two groups, and are respectively located on both sides of the PEM membrane.

[0020] Furthermore, the inkjet mechanism includes an ink chamber, piezoelectric ceramics and a plurality of nozzles, the ink chamber is connected to the nozzles, the piezoelectric ceramics are arranged above the nozzles, and a sensor is arranged on one side of the outer wall of the ink chamber close to the PEM membrane surface.

[0021] Beneficial effects: This application combines customized inkjet printing with CCM coating preparation process, and sets an adjustment mechanism to make the PEM membrane less prone to distortion. The inkjet method can adapt to PEM membranes of different shapes and sizes, and can save material consumption. At the same time, the product can be customized and the production is flexible. It can not only realize large-scale roll-to-roll production, but also realize the quick production of sheet materials with a simple process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 The process flow diagram of the method for preparing the water electrolysis membrane electrode of the present invention is shown;

[0024] Figure 2 It is a schematic diagram of the overall structure of the water electrolysis membrane electrode preparation equipment of the present invention;

[0025] Figure 3 This is a schematic diagram of the inkjet mechanism structure of the water electrolysis membrane electrode preparation device of the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the adjustment mechanism of the water electrolysis membrane electrode preparation equipment of the present invention;

[0027] Figure 5 It is a side view of the adjustment mechanism of the water electrolysis membrane electrode preparation equipment of the present invention;

[0028] In the figure: 1. unwinding reel; 2. adjustment mechanism; 21. mounting plate; 22. pressure plate; 23. bolt; 24. nut; 25. mounting groove; 3. traction roller; 4. inkjet mechanism; 41. ink chamber; 42. nozzle; 43. piezoelectric ceramic; 44. sensor; 5. drying mechanism; 6. pressure roller; 7. receiving reel.

[0029] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in 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 creative work are within the scope of protection of the present invention.

[0031] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, "and / or" in the full text includes three solutions. Taking A and / or B as an example, it includes technical solution A, technical solution B, and technical solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] like Figure 1As shown, the embodiment of the present application provides a method for preparing a water electrolysis membrane electrode, comprising:

[0034] S1. Setting an adjustment mechanism to adjust and limit the position of the PEM membrane;

[0035] S2, setting an inkjet mechanism, and using the inkjet mechanism to spray ink on the surface of the PEM membrane;

[0036] S3, setting a drying mechanism to dry the PEM membrane after inkjet printing.

[0037] S4, setting a pressing roller to roll the dried PEM membrane.

[0038] In this embodiment, the adjustment mechanism can adjust the position of the PEM membrane, and then limit the adjusted PEM membrane to prevent displacement during subsequent inkjet and drying processes. The inkjet mechanism contains catalytic ink, which can form a catalytic coating on the PEM membrane. The drying mechanism is composed of a negative pressure fan, a quartz lamp or an infrared lamp.

[0039] Specifically, the PEM membrane is first adjusted and limited by the adjustment mechanism, so that the position of the PEM membrane corresponds to the position of the inkjet mechanism, the drying mechanism, and the pressure roller, and the PEM membrane is limited so that the PEM membrane remains flat, and then the catalytic ink is sprayed onto the surface of the PEM membrane by the inkjet mechanism to form a catalytic coating. The inkjet method can adapt to PEM membranes of different shapes, and then the drying mechanism dries and solidifies the formed catalytic coating, and finally the pressure roller is used to roll the catalytic coating to improve the bonding strength between the catalytic coating and the PEM membrane;

[0040] The inkjet mechanism is compatible with water-based and alcohol-based inks, the inkjet speed needs to be 5 to 15 m2 / h, optionally, the inkjet speed is 10 m2 / h, the inkjet accuracy needs to be 1000 to 1880 dpi, optionally, the inkjet accuracy is 1440 dpi, and the inkjet mechanism 4 operates in a clean space with a temperature of 23±3°C and a humidity of 50±5RH%;

[0041] Among them, the pressure roller has not only the function of rolling, but also the function of traction, which can drive the PEM membrane to move;

[0042] The present application combines customized inkjet printing with the CCM coating preparation process, and sets an adjustment mechanism to make the PEM membrane less prone to distortion. The inkjet method can adapt to PEM membranes of different shapes and sizes, and can also save material consumption. At the same time, the product can be customized and the production is flexible. It can not only realize large-scale roll-to-roll production, but also realize the quick production of sheet materials with a simple process.

[0043] In one embodiment, the inkjet mechanism includes an ink chamber, piezoelectric ceramics and a plurality of nozzles. The ink chamber is connected to the nozzles. The piezoelectric ceramics are arranged above the nozzles. When inkjet is sprayed, the ink is subjected to instantaneous high-speed squeezing through the piezoelectric ceramics and is ejected from the nozzles.

[0044] In this embodiment, a sensor is provided on one side of the outer wall of the ink chamber close to the surface of the PEM membrane, and the sensor is a color tracking sensor;

[0045] Specifically, when the PEM membrane comes to the bottom of the inkjet mechanism after adjusting the limit, the color tracking sensor on the inkjet mechanism senses the PEM membrane, the resistance wire starts to heat up, and the catalytic ink is ejected from the nozzle to form droplets that fall on the surface of the PEM membrane;

[0046] More specifically, high-frequency jetting is formed under the action of micro-piezoelectricity, and the piezoelectric ceramic film will deform and oscillate under the action of voltage, so that the catalytic ink is squeezed at an instantaneous high speed and ejected from the nozzle. It should be noted that in this process, the ink is always at room temperature;

[0047] The number of injections / frequency may correspond to the loading amount of the catalytic ink, and after the catalytic ink is injected, an online loading detection is performed (the detection principle is XRF (X-ray fluorescence spectrometry) and Xray (X-ray) principle).

[0048] In one embodiment, the inkjet mechanism, the drying mechanism and the pressure roller are each provided in two groups, and are respectively located on both sides of the PEM membrane.

[0049] In this embodiment, by providing two sets of inkjet mechanisms, drying mechanisms and pressure rollers, both sides of the PEM membrane can be processed simultaneously, thereby effectively improving the preparation efficiency.

[0050] In one embodiment, the ink is a catalyst ink, and the ink includes an anode ink and a cathode ink.

[0051] In this embodiment, the components of the anode ink are catalyst (the catalyst is one or more of IrO2, RuO, Ir, IrxRuyO, Pt, IrO2 / Ti), perfluorosulfonic acid resin, alcohol (isopropanol, n-propanol, ethanol), and pure water;

[0052] The components of the cathode ink are catalyst (the catalyst is one or more of Pt / C and Pt), perfluorosulfonic acid resin, alcohols (isopropanol, n-propanol, ethanol), and pure water.

[0053] like Figure 2-3 As shown, the embodiment of the present application provides a water electrolysis membrane electrode preparation device, which is applied to the water electrolysis membrane electrode preparation method in any one of the above embodiments, including:

[0054] Unwinding reel 1, which is used for unwinding the PEM membrane;

[0055] A processing area, which is arranged between the unwinding reel 1 and the receiving reel 7 and at least one processing area is arranged, and the processing area processes the PEM film unwinding from the unwinding reel 1;

[0056] The receiving reel 7 is used for receiving the processed PEM membrane.

[0057] In this embodiment, the unwinding reel 1 can wind the PEM film on the shaft, and then one end of the PEM film passes through the processing area and is connected to the receiving shaft;

[0058] During operation, the PEM membrane is continuously transported to the processing area through the cooperation of the unwinding shaft and the receiving shaft. The processed PEM membrane will be wound up by the receiving shaft, which effectively improves the production efficiency.

[0059] In one embodiment, the processing area includes an adjustment mechanism 2, a pulling roller 3, an inkjet mechanism 4, a drying mechanism 5 and a pressing roller 6, and the adjustment mechanism 2, the pulling roller 3, the inkjet mechanism 4, the drying mechanism 5 and the pressing roller 6 are arranged in sequence in the processing area.

[0060] In this embodiment, the discharge shaft discharges the PEM membrane, firstly, the PEM membrane passes through the adjustment mechanism 2, the adjustment mechanism 2 adjusts the position of the PEM membrane so that the position of the PEM membrane corresponds to the position of the inkjet mechanism 4, the drying mechanism 5, and the pressure roller 6, and limits the PEM membrane so that the PEM membrane remains flat, and then it is transported to the inkjet mechanism 4 under the traction of the traction roller 3, and after arriving under the inkjet mechanism 4, the catalytic ink is sprayed onto the surface of the PEM membrane by the inkjet mechanism 4 to form a catalytic coating, and then the PEM membrane with the catalytic coating on the surface is pulled by the traction roller 3 to the drying mechanism 5, and the drying mechanism 5 dries and solidifies the formed catalytic coating, and finally the dried and solidified PEM membrane is rolled by the pressure roller 6, so that the bonding strength between the catalytic coating and the PEM membrane is improved, and after completing the above processing technology, the receiving shaft winds and collects the processed PEM membrane;

[0061] The drying mechanism 5 is composed of a negative pressure fan, a quartz lamp or an infrared lamp; the pressure roller 6 has not only the function of rolling, but also the function of traction, and can cooperate with the traction roller 3 to drive the PEM membrane to move;

[0062] By setting the adjustment mechanism 2, the PEM membrane is not easily twisted and deformed. The inkjet method can adapt to PEM membranes of different shapes and sizes, and can save material consumption. At the same time, the product can be customized and the production is flexible. Not only can large-scale roll-to-roll production be achieved, but also the quick production of sheets can be achieved with a simple process.

[0063] In one embodiment, the pulling roller 3, the inkjet mechanism 4, the drying mechanism 5 and the pressing roller 6 are each provided in two groups and are respectively located on both sides of the PEM membrane.

[0064] In this embodiment, by providing two groups of traction rollers 3, inkjet mechanisms 4, drying mechanisms 5 and pressure rollers 6, both sides of the PEM membrane can be processed simultaneously, thereby effectively improving the preparation efficiency.

[0065] In one embodiment, the inkjet mechanism 4 includes an ink chamber 41, a piezoelectric ceramic 43 and a plurality of nozzles 42. The ink chamber 41 is connected to the nozzle 42. The piezoelectric ceramic 43 is arranged above the nozzle 42. A sensor 44 is arranged on the side of the outer wall of the ink chamber 41 close to the PEM membrane surface.

[0066] In this embodiment, the sensor 44 is a color tracking sensor. Under the action of the traction roller 3, when the PEM membrane after adjusting the limit is transported to the bottom of the inkjet mechanism 4, the color tracking sensor 44 on the inkjet mechanism 4 senses the PEM membrane, and the resistance wire begins to heat up, and the catalytic ink is sprayed out from the nozzle 42, forming droplets falling on the surface of the PEM membrane, and forming high-frequency injection under the action of micro-piezoelectricity. The piezoelectric ceramic 43 film will deform and oscillate under the action of voltage, so that the catalytic ink is squeezed at an instantaneous high speed and sprayed out from the nozzle 42. In this process, the ink is always at room temperature;

[0067] Among them, the nozzle 42 model can be selected from XP600, DX7, DX5, 4720 or 5113, which is compatible with water-based and alcohol-based inks. The inkjet speed needs to be 5-15㎡ / h. Optionally, the inkjet speed is 10㎡ / h. The inkjet accuracy needs to be 1000-1880dpi. Optionally, the inkjet accuracy is 1440dpi. The inkjet mechanism 4 operates in a clean space with a temperature of 23±3℃ and a humidity of 50±5RH%.

[0068] like Figure 4-5 As shown, in one embodiment, the adjustment mechanism 2 includes a mounting plate 21 and at least two pressure plates 22. The pressure plates 22 are detachably mounted on the surface of the mounting plate 21 and are arranged at intervals. The pressure plates 22 are used to limit and adjust both sides of the PEM membrane.

[0069] In this embodiment, there are two pressing plates 22, and there is a gap between the ends of the two pressing plates 22 that are close to each other and the mounting plate 21. Both sides of the PEM membrane pass through the gap. The pressing plates 22 restrict and adjust the position of the PEM membrane edge so that the PEM membrane remains flat and the edges of both sides of the PEM membrane do not curl.

[0070] In one embodiment, the mounting plate 21 is provided with mounting grooves 25 corresponding in number and position to the pressing plates 22 , and the pressing plates 22 are fixedly mounted in the mounting grooves 25 by bolts 23 and nuts 24 .

[0071] In this embodiment, the mounting groove 25 is in the shape of an oblong hole. The oblong hole shape allows the spacing between the two pressure plates 22 to be adjusted to accommodate PEM membranes of different widths. During installation, the bolt 23 passes through the pressure plate 22 and the mounting groove 25 at the same time, and the other end of the bolt 23 is tightened by the nut 24 to complete the installation of the pressure plate 22.

[0072] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for preparing a water electrolysis membrane electrode, characterized in that: include: An adjustment mechanism is provided to adjust and limit the position of the PEM membrane through the adjustment mechanism; An inkjet mechanism is provided to spray ink on the surface of the PEM membrane; A drying mechanism is provided to dry the PEM membrane after inkjet printing.

2. The method for preparing a water electrolysis membrane electrode according to claim 1, characterized in that: After the drying mechanism dries the PEM membrane after inkjet, the steps further include: A pressing roller is provided to roll the dried PEM membrane.

3. The method for preparing a water electrolysis membrane electrode according to claim 1, characterized in that: The inkjet mechanism includes an ink chamber, piezoelectric ceramics and a plurality of nozzles. The ink chamber is connected to the nozzles. The piezoelectric ceramics are arranged above the nozzles. When ink is sprayed, the ink is subjected to instantaneous high-speed extrusion through the piezoelectric ceramics and is sprayed out from the nozzles.

4. The method for preparing a water electrolysis membrane electrode according to claim 3, characterized in that: A sensor is arranged on one side of the outer wall of the ink cavity close to the surface of the PEM membrane.

5. The method for preparing a water electrolysis membrane electrode according to claim 1, characterized in that: The inkjet mechanism, the drying mechanism and the pressing roller are each provided in two groups and are respectively located on both sides of the PEM membrane.

6. The method for preparing a water electrolysis membrane electrode according to claim 3, characterized in that: The ink is a catalyst ink, and the ink includes an anode ink and a cathode ink.

7. A water electrolysis membrane electrode preparation device, characterized in that: The method for preparing a water electrolysis membrane electrode according to any one of claims 1 to 6 comprises: A discharge reel, the discharge reel is used for discharging the PEM membrane; A processing area, wherein the processing area is arranged between the unwinding reel and the receiving reel and at least one processing area is arranged, and the processing area processes the PEM film unwinding from the unwinding reel; A take-up reel is used to take up the processed PEM membrane.

8. The water electrolysis membrane electrode preparation equipment according to claim 7, characterized in that: The processing area comprises an adjustment mechanism, a traction roller, an inkjet mechanism, a drying mechanism and a pressing roller, and the adjustment mechanism, the traction roller, the inkjet mechanism, the drying mechanism and the pressing roller are sequentially arranged in the processing area.

9. The water electrolysis membrane electrode preparation equipment according to claim 8, characterized in that: The traction roller, the inkjet mechanism, the drying mechanism and the pressure roller are each provided in two groups and are respectively located on both sides of the PEM membrane.

10. The water electrolysis membrane electrode preparation equipment according to claim 8, characterized in that: The inkjet mechanism comprises an ink chamber, piezoelectric ceramics and a plurality of nozzles, the ink chamber is connected to the nozzles, the piezoelectric ceramics are arranged above the nozzles, and a sensor is arranged on one side of the outer wall of the ink chamber close to the PEM membrane surface.

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