PEM electrolyzed water polar plate

Abstract

The utility model discloses a PEM electrolyzed water polar plate which comprises a plate body, a plurality of first flow channels which are transversely and vertically arranged in a staggered mode and communicated with one another are formed in one side of the plate body, second flow channels are arranged on the two sides of the first flow channels respectively, the first flow channels are communicated with the second flow channels, a through hole is formed in one end of each second flow channel, and the through holes penetrate through the plate body; and the inner walls and the bottom surfaces of the first flow channel and the second flow channel are coated with the ultra-infiltration coatings. The device has the beneficial effects that the inner walls of the first flow channel and the second flow channel are subjected to hydrophilic coating treatment, the inner walls of the first flow channel and the second flow channel are replaced by super-infiltration interfaces, the coatings are endowed with hydrophilicity and super-wettability, adhesion of bubbles on the inner walls of the first flow channel and the second flow channel is remarkably reduced, and the situation that bubble aggregation affects water transmission is prevented; the mass transfer capacity of the first runner and the second runner is improved, mass transfer polarization loss of the electrolytic cell is reduced, and the electrolytic performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of PEM electrolyzed water, and particularly relates to a PEM electrolyzed water plate Background Art

[0002] A PEM water electrolyzer is an electrochemical device for energy conversion, which consumes water and electric energy to generate hydrogen and oxygen. Its main structures include a membrane electrode assembly (MEA), a porous transport layer (PTL), a bipolar plate, an insulating plate, an end plate, etc. To avoid the corrosion of the electrolyzer plate, people usually select metal titanium with strong stability as the plate material, and design a flow field structure that conforms to hydrodynamics to optimize the mass transfer and heat transfer performance of the plate, avoiding local water shortage, excessive temperature or current, and even plating inert noble metals such as platinum and gold on its surface

[0003] In the prior art, there are still certain defects in the plate, for example: the water vapor transmission capacity is relatively low, and the bubbles generated by the water flow will adsorb on the surface of the flow channel, gather to form large bubbles, hinder the transmission of reaction water, and reduce the electrolysis performance. In view of this, the present application proposes a PEM electrolyzed water plate to solve such problems Summary of the Utility Model

[0004] Based on this, in order to solve the problems existing in the prior art, the present application provides a PEM electrolyzed water plate, including: a plate body, on one side of the plate body, there are provided a number of first flow channels arranged vertically and horizontally and communicating with each other, on both sides of the number of first flow channels, second flow channels are respectively provided, the first flow channels are communicated with the second flow channels, and at one end of each second flow channel, there is provided a through hole, and the through hole penetrates the plate body

[0005] A superwetting coating, and the superwetting coating is coated on the inner walls and bottom surfaces of the first flow channels and the second flow channels

[0006] Further, a conductive coating is provided on the surface of the side of the plate body where the flow channels are provided

[0007] Further, the horizontally arranged first flow channels are perpendicular to the vertically arranged first flow channels

[0008] Further, the depth of the second flow channels is greater than the depth of the first flow channels

[0009] Further, on the other side of the plate body, a groove is provided corresponding to the position of the through hole, and the diameter of the groove is greater than the diameter of the through hole

[0010] Further, at least two positioning holes are provided on the plate body, and the positioning holes penetrate the plate body

[0011] Further, the superwetting coating is any one of polyvinylpyrrolidone (PVP), polyacrylamide (PAM), or polyvinyl alcohol (PEG)

[0012] Further, the material of the conductive coating is gold or platinum.

[0013] Further, the thickness of the conductive coating is 0.05 μm - 3 μm.

[0014] Further, a wiring hole is provided on the side wall of the plate body, and the wiring hole is used for connecting a wire.

[0015] Beneficial effects: By performing a hydrophilic coating treatment on the inner walls of the first flow channel and the second flow channel, the inner walls of the first flow channel and the second flow channel are replaced with a superwetting interface, endowing the coating with hydrophilicity and superwetting properties, significantly reducing the adhesion of bubbles on the inner walls of the first flow channel and the second flow channel, preventing bubble aggregation from affecting water transmission, improving the mass transfer capacity of the first flow channel and the second flow channel, reducing the mass transfer polarization loss of the electrolytic cell, and improving the electrolysis performance. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the PEM electrolytic water electrode plate of the present invention;

[0018] Figure 2 It is a schematic sectional structure diagram of the PEM electrolytic water electrode plate of the present invention;

[0019] Figure 3 It is Figure 2 the enlarged view at A in

[0020] Figure 4 It is a top view of the PEM electrolytic water electrode plate of the present invention;

[0021] Figure 5 It is a schematic bottom structure diagram of the PEM electrolytic water electrode plate of the present invention;

[0022] Figure 6 It is a broken line graph of the current density and the internal resistance of the electrolytic cell of the PEM electrolytic water electrode plate of the present invention;

[0023] Figure 7 It is a broken line graph of the current density and the voltage of the PEM electrolytic water electrode plate of the present invention;

[0024] In the figure: 1. Plate body; 11. First flow channel; 12. Second flow channel; 13. Through hole; 14. Groove; 15. Positioning hole; 16. Wiring hole; 2. Superwetting coating; 3. Conductive coating.

[0025] The realization, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0028] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, "and / or" throughout the text includes three scenarios. Taking A and / or B as an example, it includes the technical solution of A, the technical solution of B, and the technical solution that A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0029] As Figures 1 - 5 shown, the embodiment of the present application provides a PEM electrolytic water electrode plate, including: a plate body 1, on one side of the plate body 1, a plurality of first flow channels 11 arranged vertically and horizontally and communicating with each other are provided. On both sides of the plurality of first flow channels 11, second flow channels 12 are respectively provided. The first flow channels 11 communicate with the second flow channels 12. Through holes 13 are provided at one end of each second flow channel 12, and the through holes 13 penetrate the plate body 1;

[0030] A superwetting coating 2 is provided on the inner walls and bottom surfaces of the first flow channels 11 and the second flow channels 12.

[0031] In this embodiment, the first flow channels 11 arranged horizontally on the plate body 1 are perpendicular to the first flow channels 11 arranged vertically, which can improve the passing rate of the liquid in the flow channels; the number of the second flow channels 12 is two, one for liquid input and one for liquid output, and the depth of the second flow channels 12 in the thickness direction of the plate body 1 is greater than the depth of the first flow channels 11 in the thickness direction of the plate body 1; the through holes 13 penetrate the plate body 1 in the thickness direction of the plate body 1. When multiple electrode plates are stacked, the liquid between the electrode plates can flow through the through holes 13 to communicate with each other;

[0032] Among them, the cross-sectional shapes of the first flow channels 11 and the second flow channels 12 can be semi-circular, polygonal, U-shaped, etc., and the cross-sectional shape of the through holes 13 is circular or polygonal, etc.;

[0033] By performing a hydrophilic coating treatment on the inner walls of the first flow channels 11 and the second flow channels 12, the inner walls of the first flow channels 11 and the second flow channels 12 are replaced with a super-wetting interface. A stable hydrophilic cross-linked coating film is formed on the inner walls of the first flow channels 11 and the second flow channels 12 by the polymer. By using the non-ionic (such as hydroxyl groups, amino groups, ether bonds, etc.) or ionic (such as carboxyl groups, sulfonic acid groups, quaternary amine groups, etc.) hydrophilic groups contained in the molecule, a large amount of water is absorbed to form a hydration layer, endowing the coating with hydrophilicity and super-wetting property, significantly reducing the attachment of air bubbles on the inner walls of the first flow channels 11 and the second flow channels 12, preventing the aggregation of air bubbles from affecting water transmission, improving the mass transfer capacity of the first flow channels 11 and the second flow channels 12, reducing the mass transfer polarization loss of the electrolytic cell, and improving the electrolysis performance;

[0034] Specifically, the material of the super-wetting coating 2 is any one of polyvinylpyrrolidone (PVP), polyacrylamide (PAM), or polyvinyl alcohol (PEG).

[0035] In one embodiment, a conductive coating layer 3 is provided on the surface of the plate body 1 where the flow channels are arranged.

[0036] In this embodiment, by performing a conductive coating layer 3 treatment on the surface of the plate body 1 where the flow channels are arranged, the weak conductive substrate interface is replaced with a strong conductive interface. While not affecting the original pressing ability, the conductivity of the electrode plate is improved, the internal resistance of the electrolytic cell is reduced, and the electrolysis performance is improved;

[0037] Optionally, the material of the conductive coating layer 3 is a material with better conductive effect, such as gold or platinum, etc.;

[0038] Optionally, the thickness of the conductive coating layer 3 is 0.05 μm - 3 μm.

[0039] In one embodiment, a groove 14 is provided at the position of the plate body 1 corresponding to the through holes 13 on the other side, and the diameter of the groove 14 is larger than the diameter of the through holes 13.

[0040] In this embodiment, a groove 14 is provided at a position corresponding to the through hole 13 on the other side of the plate body 1, aiming to achieve better connection between the plates; the cross-sectional shape of the groove 14 is the same as that of the through hole 13, and the axis of the groove 14 coincides with the axis of the through hole 13.

[0041] In one embodiment, at least two positioning holes 15 are provided on the plate body 1, and the positioning holes 15 penetrate through the plate body 1.

[0042] In this embodiment, the provision of the positioning holes 15 enables precise positioning when multiple plates are stacked, making the installation convenient and fast.

[0043] In one embodiment, a wiring hole 16 is provided on the side wall of the plate body 1, and the wiring hole 16 is used to connect a wire.

[0044] In one embodiment, a processing method for a PEM electrolytic water plate is as follows:

[0045] S1. Remove dust and organic matter contamination on the surface of the plate: Clean the surface of the plate, soak it three times for 30 minutes each time using solvents such as deionized water, ethanol, acetone, or a mixed solution of deionized water and organic solvents, and then ventilate and dry.

[0046] S2. Deposit platinum on the surface of the plate using physical vapor deposition (PVD) or chemical vapor deposition (CVD): Specifically, taking the PVD method as an example, first place the plate in a PVD coating machine, close the furnace door and evacuate, then turn on the DC power supply to make argon glow discharge and convert it into argon ions; the argon ions bombard the surface of the plate, and ions and contaminants are sputtered out; apply alternating current to vaporize the plating material on the target; the plating material atoms or ions rush towards the plate at high speed under the action of a high-voltage electric field; a firm platinum coating gradually accumulates on the surface of the plate.

[0047] S3. Ultraviolet exposure: Stick a masking sticker on the surface of the platinum-coated plate to expose the areas of the first flow channel 11 and the second flow channel 12, then fix the plate with a hook, immerse it in the hydrophilic coating solution for 5 - 15 s, then take out the plate and expose it to ultraviolet light for curing for 200 - 300 s.

[0048] S4. Absorb water by the superwetting coating 2: Remove the masking sticker from the plate, soak it in deionized water for 4 h to allow the superwetting coating 2 to fully absorb water and become wet, and then an electrolytic water plate with a dual-functional coating can be obtained.

[0049] By processing the plate through the above method and using the plate to assemble a water electrolyzer, the contact resistance between the PTL and the plate can be greatly reduced. At the same time, the water and gas transmission rate in the flow field is increased, the mass transfer capacity of the electrolyzer is enhanced, and starting from reducing the ohmic polarization voltage loss and the mass transfer polarization voltage loss, the performance of the electrolyzer is improved.

[0050] As Figures 6 - 7 shown, under the working conditions of normal pressure, 60 °C, and a reaction water flow rate of 200 mL / min, using a proton exchange membrane with a thickness of 80 μm, the current density is 3 A / cm 2 , the internal resistance of the water electrolysis cell can be as low as 74.95 mΩ·cm 2 , the electrolysis voltage reaches 1.78 V, and the slope increase caused by the increase in mass transfer polarization does not appear in the i-V curve.

[0051] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A PEM water electrolysis plate, characterized in that: include: A plate body, wherein a plurality of first flow channels which are arranged in a staggered manner horizontally and vertically and are interconnected are provided on one side of the plate body, second flow channels are respectively provided on both sides of the plurality of first flow channels, the first flow channels are connected to the second flow channels, and a through hole is provided at one end of each of the second flow channels, and the through hole passes through the plate body; A superwetting coating is coated on the inner wall and bottom surface of the first flow channel and the second flow channel.

2. The PEM water electrolysis plate according to claim 1, characterized in that: A conductive coating is provided on one side of the plate body where the flow channel is provided.

3. The PEM water electrolysis plate according to claim 2, characterized in that: The first flow channel arranged horizontally and the first flow channel arranged vertically are perpendicular to each other.

4. The PEM water electrolysis plate according to claim 1, characterized in that: The depth of the second flow channel is greater than the depth of the first flow channel.

5. The PEM water electrolysis plate according to claim 1, characterized in that: A groove is arranged at the other side of the plate body at a position corresponding to the through hole, and a diameter of the groove is larger than a diameter of the through hole.

6. The PEM water electrolysis plate according to claim 1, characterized in that: At least two positioning holes are arranged on the plate body, and the positioning holes penetrate through the plate body.

7. The PEM water electrolysis plate according to claim 1, characterized in that: The super-wetting coating is any one of polyvinyl pyrrolidone (PVP), polyacrylamide (PAM) or polyvinyl alcohol (PEG).

8. The PEM water electrolysis plate according to claim 2, characterized in that: The material of the conductive plating layer is gold or platinum.

9. The PEM water electrolysis plate according to claim 8, characterized in that: The thickness of the conductive coating is 0.05 μm-3 μm.

10. The PEM water electrolysis plate according to claim 1, characterized in that: The side wall of the plate body is provided with a wiring hole, and the wiring hole is used for connecting a wire.

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