CN218089825U - Asymmetric electrolytic water film electrode frame and porous transmission layer - Google Patents
Asymmetric electrolytic water film electrode frame and porous transmission layer Download PDFInfo
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- CN218089825U CN218089825U CN202222103366.4U CN202222103366U CN218089825U CN 218089825 U CN218089825 U CN 218089825U CN 202222103366 U CN202222103366 U CN 202222103366U CN 218089825 U CN218089825 U CN 218089825U
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Abstract
The utility model discloses an asymmetric electrolysis water film electrode frame and porous transmission layer, wherein, asymmetric electrolysis water film electrode frame is used for encapsulating proton exchange membrane, including first frame and second frame, first fretwork portion has been seted up at the middle part of first frame, and first frame sets up with the laminating of second frame, and second fretwork portion has been seted up at the middle part of second frame, and arbitrary inside wall with the first fretwork portion of one side has first preset distance with the inside wall mistake of second fretwork portion. The asymmetric electrolytic water film electrode frame can avoid mechanical damage to the first frame, the second frame and the proton exchange membrane caused by stress, thereby improving the overall quality of the membrane electrode and prolonging the service life of the membrane electrode.
Description
Technical Field
The utility model relates to an electrolytic water technical field, in particular to asymmetric electrolytic water film electrode frame and porous transmission layer.
Background
With the increasing demand for low carbon and emission reduction, the green preparation technology of hydrogen is widely regarded, and hydrogen production by using electrolyzed water is the process with the lowest carbon emission in numerous hydrogen source schemes at present. Among them, proton Exchange Membrane Water Electrolysis (PEMWE) is attracting attention in the field of electrocatalytic hydrogen production from renewable energy sources. The method has the advantages of high response speed, wide power fluctuation adaptation and high flexibility. Therefore, the water electrolysis of the proton exchange membrane has very wide application prospect.
A Membrane Electrode Assembly (MEA) is a core component of water electrolysis of proton exchange membranes, and is a main site where electrochemical reactions occur. The membrane electrode is used as a basic unit of the electrochemical reaction of water electrolysis, and the performance and the stability of the water electrolyzer are determined by the structural design and the quality of the preparation process scheme.
Membrane electrode is important for the electrolysis of water in proton exchange membranes, and it is usually necessary to encapsulate them with a frame membrane to protect the membrane electrodes. The size and shape of the frame of the membrane electrode in the prior art are completely symmetrical, so that the stress can be distributed on the same section of the frame of the membrane electrode and the proton exchange membrane after the frame of the membrane electrode and the proton exchange membrane are assembled under pressure, the frame of the membrane electrode and the proton exchange membrane are mechanically damaged, the integral quality of the membrane electrode is influenced, and the service life of the membrane electrode is shortened.
Disclosure of Invention
Therefore, a need exists for providing an asymmetric electrolytic water film electrode frame and a porous transmission layer, so as to solve the technical problem that in the prior art, after pressurization assembly, stress of the film electrode frame and a proton exchange membrane is distributed on the same section of the film electrode frame and the proton exchange membrane, and mechanical damage is caused to the film electrode frame and the proton exchange membrane.
The utility model provides a pair of asymmetric electrolysis water film electrode frame for encapsulation proton exchange membrane, include:
the middle part of the first frame is provided with a first hollow part; and
the first frame and the second frame are attached to each other, a second hollow portion is formed in the middle of the second frame, and the inner side wall of the first hollow portion and the inner side wall of the second hollow portion on the same arbitrary side are staggered by a first preset distance.
Furthermore, a first preset distance between the inner side wall of the first hollow-out portion and the inner side wall of the second hollow-out portion in a staggered mode is 1-5 mm.
Further, the first hollow-out part and the second hollow-out part are of square structures.
Furthermore, the first hollow-out part and the second hollow-out part are of rectangular structures, and the lengths of four inner side walls of the first hollow-out part are all larger than the lengths of four corresponding inner side walls of the second hollow-out part.
Furthermore, the first hollow-out part and the second hollow-out part are of rectangular structures, the length of one set of two opposite inner side walls of the first hollow-out part is greater than that of two opposite inner side walls of the second hollow-out part in the same direction, and the length of the other set of two opposite inner side walls of the first hollow-out part is less than that of two opposite inner side walls of the second hollow-out part in the same direction.
Furthermore, a first through hole is formed in the first frame, a second through hole is formed in the second frame, the first through hole and the second through hole are overlapped, and the first through hole and the second through hole are used for an external connecting piece to attach the first frame to the second frame.
Further, the thickness of the first frame is 25-125 μm and/or the thickness of the second frame is 25-125 μm.
In another embodiment, the utility model provides a porous transmission layer, including above-mentioned asymmetric electrolysis water film electrode frame, proton exchange membrane, first porous transmission layer and with the relative porous transmission layer of second that sets up of first porous transmission layer, proton exchange membrane encapsulate in asymmetric electrolysis water film electrode frame, asymmetric electrolysis water film electrode frame set up in first porous transmission layer with between the porous transmission layer of second, the lateral wall of first porous transmission layer with the lateral wall of the porous transmission layer of second is staggered and is had the second and predetermine the distance.
Furthermore, a second preset distance between the outer side wall of the first porous transmission layer and the outer side wall of the second porous transmission layer in a staggered mode is 5-7 mm.
Further, the porous transport layer further comprises a first catalytic layer disposed between the first porous transport layer and the proton exchange membrane and a second catalytic layer disposed between the second porous transport layer and the proton exchange membrane.
The utility model provides a pair of asymmetric electrolysis water film electrode frame includes first frame and second frame, first fretwork portion has been seted up at the middle part of first frame, first frame sets up with the laminating of second frame, second fretwork portion has been seted up at the middle part of second frame, the inside wall of first fretwork portion has first default distance with the inside wall of second fretwork portion is left out, the projection of the inside wall of first fretwork portion and the projection of the inside wall of second fretwork portion do not coincide in vertical direction promptly. When first frame, second frame and proton exchange membrane equipment pressurization, stress can not distribute on first frame, second frame and proton exchange membrane's same tangent plane, can avoid the stress to the mechanical damage that first frame, second frame and proton exchange membrane caused to improve the holistic quality of membrane electrode, increase the life of membrane electrode.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an asymmetric electrolytic water film electrode frame in an embodiment of the present invention;
FIG. 2 is a schematic diagram of an asymmetric electrolytic water film electrode according to an embodiment of the present invention;
FIG. 3 is a schematic view of a partial structure of an asymmetric electrolytic water film electrode according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a membrane electrode with a symmetrical structure according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a membrane electrode with an asymmetric structure according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a membrane electrode having an asymmetric structure according to another embodiment of the present invention.
The main components are as follows:
100. a first frame; 110. a first hollow-out section; 111. the inner side wall of the first hollow part; 120. a first through hole; 200. a second frame; 210. a second hollowed-out portion; 211. the inner side wall of the second hollow part; 220. a second through hole; 300. a proton exchange membrane; 400. a first porous transport layer; 410. an outer sidewall of the first porous transport layer; 500. a second porous transport layer; 510. an outer sidewall of the second porous transfer layer; 600. a first catalytic layer; 700. a second catalytic layer.
The realization, the functional characteristics and the advantages of the utility model are further explained by combining the embodiment and referring to the attached drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, "and/or" in the whole text includes three schemes, taking a and/or B as an example, and includes a technical scheme a, a technical scheme B, and a technical scheme that a and B meet simultaneously; in addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
As shown in fig. 1 to 3, an arrow in fig. 1 indicates a film coating process, and an asymmetric electrolytic water film electrode frame is used for packaging a proton exchange membrane 300, and includes a first frame 100 and a second frame 200, a first hollow portion 110 is disposed in the middle of the first frame 100, the first frame 100 and the second frame 200 are attached to each other, a space for accommodating the proton exchange membrane 300 is formed between the first frame 100 and the second frame 200, a second hollow portion 210 is disposed in the middle of the second frame 200, and a first preset distance is formed by staggering an inner sidewall 111 of the first hollow portion and an inner sidewall 211 of the second hollow portion on any same side, that is, a projection of the inner sidewall 111 of the first hollow portion and a projection of the inner sidewall 211 of the second hollow portion are not overlapped in a vertical direction. Specifically, the first frame 100 and the second frame 200 are attached to each other, that is, the first frame 100 and the second frame are stacked.
As shown in fig. 5, when the first frame 100, the second frame 200 and the proton exchange membrane 300 are assembled and pressurized, the stress is dispersed (the arrow shown in fig. 4 and 5 indicates the stress), so that the proton exchange membrane 300, the first frame 100 and the second frame 200 are in a wavy shape, the stress is not distributed on the same section of the asymmetric electrolytic water film electrode frame and the proton exchange membrane 300, and the mechanical damage to the first frame 100, the second frame 200 and the proton exchange membrane 300 caused by the stress can be avoided, thereby improving the overall quality of the membrane electrode and prolonging the service life of the membrane electrode. Specifically, the first bezel 100 and the second bezel 200 are bezel films.
It should be noted that, as shown in fig. 4, if the first frame 100 and the second frame 200 are symmetrical with respect to the proton exchange membrane 300, the first frame 100 and the second frame 200 are distributed on the same cross section of the proton exchange membrane 300, and a notch is formed at the cross section. The area of the second hollow-out portion 210 is smaller than the area of the first hollow-out portion 110, and the inner sidewall 111 of the first hollow-out portion and the inner sidewall 211 of the second hollow-out portion are staggered by a first preset distance, that is, the first frame 100 and the second frame 200 are asymmetric with respect to the proton exchange membrane 300, so that a dent can be prevented from being formed at the section position.
Specifically, the first hollow portion 110 and the second hollow portion 210 have the same shape, and the area of the second hollow portion 210 is smaller than that of the first hollow portion 110.
Specifically, the first preset distance between the inner sidewall 110 of the first hollow portion and the inner sidewall 210 of the second hollow portion is 1mm to 5mm, so that the stress is more dispersed in the first frame 100, the second frame 200 and the proton exchange membrane 300. More specifically, the first frame 100 and the second frame 200 have a square structure. Specifically, the first hollow portion 110 and the second hollow portion 210 have a square structure.
Optionally, the first hollow portion 110 and the second hollow portion 210 are rectangular structures, and the lengths of the four inner side walls of the first hollow portion 110 are all greater than the lengths of the four corresponding inner side walls of the second hollow portion 210.
In some embodiments, the first frame 100 is a square with an outer perimeter of 9cm and the second frame 200 is a square with an outer perimeter of 9 cm. The first hollow-out part 110 is a square with a side length of 6.2cm, the second hollow-out part 210 is a square with a side length of 5.8cm, and the first preset distance staggered on any same side is 0.2cm.
In some embodiments, the first frame 100 is a square with an outer perimeter of 9cm, and the second frame 200 is a square with an outer perimeter of 9 cm. The first hollow-out portion 110 is a square with a side length of 6.3cm, the second hollow-out portion 210 is a square with a side length of 5.7cm, the first preset distance of any same side in a staggered mode is 0.3cm, or the first preset distance of two sides in a staggered mode is 0.1cm and the first preset distance of the other two sides in a staggered mode is 0.5cm.
Optionally, as shown in fig. 6, the first hollow portion 110 and the second hollow portion 210 are rectangular structures, lengths of two sets of opposite inner sidewalls of the first hollow portion 110 are both greater than lengths of two opposite inner sidewalls of the second hollow portion 210 in the same direction, and lengths of two other sets of opposite inner sidewalls of the first hollow portion 110 are both less than lengths of two opposite inner sidewalls of the second hollow portion 210 in the same direction.
Further, the first frame 100 has a first through hole 120, the second frame 200 has a second through hole 220, the first through hole 120 and the second through hole 220 are overlapped, and the first through hole 120 and the second through hole 220 are used for an external connecting member to attach the first frame 100 to the second frame 200. Further, the first through hole 120 and the second through hole 220 may be provided in plural, and the plural first through holes 120 and the plural second through holes 220 are overlapped one by one.
In another embodiment, as shown in fig. 3, a porous transport layer includes an asymmetric membrane electrode rim, a proton exchange membrane 300, a first porous transport layer 400, and a second porous transport layer 500 disposed opposite to the first porous transport layer 400, the proton exchange membrane 300 is packaged in the asymmetric membrane electrode rim, the asymmetric membrane electrode rim is disposed between the first porous transport layer 400 and the second porous transport layer 500, the outer sidewall 410 of the first porous transport layer is staggered from the outer sidewall 510 of the second porous transport layer by a second predetermined distance, that is, the projection of the outer sidewall 410 of the first porous transport layer is not overlapped with the projection of the outer sidewall 510 of the second porous transport layer in the vertical direction, and the first porous transport layer 400 and the second porous transport layer 500 are asymmetric with respect to the proton exchange membrane 300. During assembly and pressurization, stress can be dispersed, so that the first frame membrane 100 and the second frame membrane 200 are in a wavy shape, the stress cannot be distributed on the same section of the membrane electrode frame, mechanical damage to the membrane electrode frame caused by the stress can be avoided, and the overall quality of the membrane electrode is improved.
Specifically, the outer sidewall 410 of the first porous transmission layer and the outer sidewall 510 of the second porous transmission layer are staggered by a second predetermined distance of 5mm to 7mm.
More specifically, the area of the side of the first porous transport layer 400 facing the second porous transport layer 500 is not equal to the area of the side of the second porous transport layer 500 facing the first porous transport layer 400.
Further, the area of the side of the first porous transport layer 400 facing the second porous transport layer 500 may be larger than the area of the side of the second porous transport layer 500 facing the first porous transport layer 400. When the first porous transport layer 400 and the second porous transport layer 500 are the same shape, such as both square structures, the length of the first porous transport layer 400 is larger than the length of the second porous transport layer 500 from a cross-sectional perspective, i.e., the outer sidewall 410 of the first porous transport layer is farther from the proton exchange membrane 300 than the outer sidewall 510 of the second porous transport layer.
Still further, the area of the side of the first porous transfer layer 400 facing the second porous transfer layer 500 may be less than the area of the side of the second porous transfer layer 500 facing the first porous transfer layer 400. When the first porous transfer layer 400 and the second porous transfer layer 500 are the same shape, such as both square structures, the length of the first porous transfer layer 400 is less than the length of the second porous transfer layer 500 from a cross-sectional perspective, i.e., the outer sidewall 510 of the second porous transfer layer is further from the proton exchange membrane 300 relative to the outer sidewall 410 of the first porous transfer layer.
Preferably, the thickness of the first frame 100 is 25 μm to 125 μm and/or the thickness of the second frame 200 is 25 μm to 125 μm.
In some embodiments, the porous transfer layer further comprises a first catalytic layer 600 and a second catalytic layer 700, the first catalytic layer 600 disposed between the first porous transfer layer 400 and the proton exchange membrane 300, and the second catalytic layer 700 disposed between the second porous transfer layer 500 and the proton exchange membrane 300.
The membrane electrode preparation method is to directly apply the cathode and anode catalyst layers on the proton exchange membrane 300, i.e. the Core Component (CCM) of the proton exchange membrane 300, which can effectively improve the catalyst utilization rate and greatly reduce the proton transfer resistance between the membrane and the catalyst layers.
In another embodiment, a method for preparing a membrane electrode includes the steps of:
s1, positioning and placing the first frame 100 on a platform in a mode that the base material faces downwards and the glue faces upwards.
S2, the CCM is positioned and placed in the central area of the first frame 100.
And S3, positioning and placing the second frame 200 on the first frame 100 and the CCM in a mode that the base material surface is upward and the adhesive surface is downward, aligning the first through hole 120 and the second through hole 220 to form a three-layer structure, flattening the three-layer structure, and tightly attaching the inner part of the three-layer structure.
And S4, transferring the three-layer structure to a heating device, and heating to a proper temperature to bond the three-layer structure into an integral structure through hot-pressing.
And S5, cooling the hot-press bonded integrated structure, and transferring the cooled integrated structure between the first porous transmission layer 400 and the second porous transmission layer 500 for compressing.
Specifically, when the three-layer structure is pressed, the CCM can be replaced by the single proton exchange membrane 300, so that the catalyst layer is prevented from being sealed into the frame membrane, and if the catalyst is sealed into the frame membrane, bubbles generated on the catalyst layer can affect the sealing effect of the frame membrane and waste the catalyst when a catalytic reaction occurs. After the three-layer structure is attached, the catalyst layer may be transferred onto the proton exchange membrane 300, but this scheme has a high requirement on the equipment, and the first frame 100 and the second frame 200 need to have good temperature resistance and pressure resistance.
The base material in S1 can be one of polyethylene glycol terephthalate, polypropylene, polyethylene protective layer, polyvinyl chloride, polycarbonate vinegar, polyththalimide, polytetrafluoroethylene, polyththalamine or polyvinyl alcohol, and the thickness is 25-125 um. The hot melt adhesive can be at least one hot melt adhesive of vinyl ethyl acetate, polyamide, polyolefin, polyester and the mixture thereof, and the thickness is 5-25 um.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (10)
1. An asymmetric electrolysis water film electrode frame, which is used for packaging a proton exchange membrane, comprises:
the middle part of the first frame is provided with a first hollow part; and
the first frame and the second frame are arranged in a laminating mode, a second hollow-out portion is formed in the middle of the second frame, and a first preset distance is formed between the inner side wall of the first hollow-out portion and the inner side wall of the second hollow-out portion on the same side at random in a staggered mode.
2. The asymmetric electrolytic water film electrode frame according to claim 1, wherein a first preset distance between the inner side wall of the first hollow portion and the inner side wall of the second hollow portion is 1mm to 5mm.
3. The asymmetric electrolytic water film electrode frame of claim 1, wherein the first and second hollowed-out portions are square.
4. The asymmetric electrolytic water film electrode frame according to claim 3, wherein the first hollow-out portion and the second hollow-out portion are rectangular, and lengths of four inner side walls of the first hollow-out portion are all greater than lengths of four corresponding inner side walls of the second hollow-out portion.
5. The asymmetric electrolytic water film electrode frame according to claim 3, wherein the first and second hollow-out portions are rectangular, the length of one set of two opposite inner side walls of the first hollow-out portion is greater than the length of two opposite inner side walls of the second hollow-out portion in the same direction, and the length of the other set of two opposite inner side walls of the first hollow-out portion is less than the length of two opposite inner side walls of the second hollow-out portion in the same direction.
6. The asymmetric electrolytic water film electrode frame as claimed in claim 1, wherein the first frame has a first through hole, the second frame has a second through hole, the first through hole and the second through hole are overlapped, and the first through hole and the second through hole are used for an external connecting member to attach the first frame to the second frame.
7. The asymmetric electrolytic water film electrode frame according to claim 1, wherein the thickness of the first frame is 25 μm to 125 μm and/or the thickness of the second frame is 25 μm to 125 μm.
8. A porous transport layer, comprising the asymmetric electrolytic water membrane electrode rim of any one of claims 1 to 7, a proton exchange membrane, a first porous transport layer, and a second porous transport layer disposed opposite to the first porous transport layer, wherein the proton exchange membrane is encapsulated in the asymmetric electrolytic water membrane electrode rim, the asymmetric electrolytic water membrane electrode rim is disposed between the first porous transport layer and the second porous transport layer, and an outer sidewall of the first porous transport layer is staggered from an outer sidewall of the second porous transport layer by a second predetermined distance.
9. The porous transfer layer of claim 8, wherein the outer sidewall of the first porous transfer layer is offset from the outer sidewall of the second porous transfer layer by a second predetermined distance of 5mm to 7mm.
10. The porous transfer layer of claim 8, further comprising a first catalytic layer disposed between the first porous transfer layer and the proton exchange membrane and a second catalytic layer disposed between the second porous transfer layer and the proton exchange membrane.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117210843A (en) * | 2023-11-09 | 2023-12-12 | 北京亿华通科技股份有限公司 | Membrane electrode and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117210843A (en) * | 2023-11-09 | 2023-12-12 | 北京亿华通科技股份有限公司 | Membrane electrode and preparation method thereof |
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