Diffusion structure and electrolytic bath

Abstract

The utility model provides a diffusion structure and an electrolytic bath, and the diffusion structure is applied to the electrolytic bath and comprises at least two silk screen layers, the at least one first felt layer is connected between the two adjacent silk screen layers. According to the diffusion structure, the first felt layer is arranged between the two adjacent silk screen layers, so that the silk screen layers are connected more stably through the first felt layer with fewer surface holes, the structural strength of the diffusion structure is further improved, and the diffusion structure can play a better supporting role in the electrolytic bath. And multi-layer filtration of the fluid can be realized by adjusting the filtration precision of the first felt layer and the silk screen layer, so that the filtration effect of the diffusion structure is improved, the influence of impurities on the membrane electrode is reduced, and the hydrogen production efficiency of the electrolytic cell is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrolytic cell technical field, concretely relates to a diffusion structure and electrolytic cell. BACKGROUND

[0002] Under the background of the current world energy structure dominated by fossil fuels, hydrogen energy is widely considered as a strong competitor to reverse the energy situation due to its high heat value and zero emissions. Among the various main preparation methods, water electrolysis is the focus of research in various countries due to its clean and efficient advantages. Normal temperature water electrolysis technology is mainly divided into alkaline water electrolysis AWE, proton exchange membrane water electrolysis PEM, and anion exchange membrane water electrolysis AEM according to the type of electrolyte.

[0003] The diffusion layer is an important component in the electrolytic cell, and a plurality of small mesh holes are usually distributed on the diffusion layer as air flow channels and liquid channels. However, the existing diffusion layer is usually made of a single layer of silk layer and mesh layer, and since the diffusion layer has certain precision requirements, the thickness of the silk layer and the mesh layer is limited, resulting in low structural strength of the diffusion layer, which cannot meet the operation and use under medium and high pressure conditions. SUMMARY

[0004] The embodiment of the utility model provides a diffusion structure, which can improve the technical problem of low structural strength of the mesh diffusion structure in the related art.

[0005] In a first aspect, the embodiment of the utility model provides a diffusion structure for an electrolytic cell, the diffusion structure comprising:

[0006] at least two silk mesh layers; and,

[0007] at least one first felt layer, the first felt layer being connected between two adjacent silk mesh layers.

[0008] In an embodiment, the diffusion structure further comprises at least one second felt layer, and one side of at least one silk mesh layer away from the first felt layer is connected with the second felt layer.

[0009] In an embodiment, the filtration precision of the second felt layer ranges from 8 μm to 12 μm.

[0010] In an embodiment, the filtration precision of the first felt layer is greater than that of the second felt layer.

[0011] In an embodiment, the thickness of the first felt layer ranges from 0.15 mm to 0.25 mm; and / or,

[0012] the thickness of the second felt layer ranges from 0.25 mm to 0.35 mm.

[0013] In an embodiment, the at least two layers of the wire mesh layer include at least one first mesh layer and at least one second mesh layer, the first mesh layer has a mesh number smaller than that of the second mesh layer, and the second felt layer is connected to a side of the second mesh layer away from the first felt layer.

[0014] In an embodiment, the mesh number of the first mesh layer ranges from 20 to 25; and / or,

[0015] the mesh number of the second mesh layer ranges from 40 to 50; and / or,

[0016] the mesh number ratio of the first mesh layer to the second mesh layer ranges from 0.4 to 0.6.

[0017] In an embodiment, the wire mesh layer, the first felt layer and the second felt layer are one of a nickel felt layer, a nickel alloy felt layer, a ceramic material felt layer, a glass fiber felt layer or a stainless steel felt layer.

[0018] In an embodiment, the at least two layers of the wire mesh layer are sintered to the at least one first felt layer.

[0019] In a second aspect, an embodiment of the utility model provides a diffusion structure.

[0020] The embodiment of the utility model has the advantages of:

[0021] The embodiment of the utility model sets the first felt layer between the two adjacent wire mesh layers, so that the wire mesh layer is connected more stably through the first felt layer with less surface cavities, thereby improving the structural strength of the diffusion structure, so that the diffusion structure can play a better supporting role in the electrolytic cell. And by adjusting the filtering accuracy of the first felt layer and the wire mesh layer, multi-layer filtration of the fluid can be realized, thereby improving the filtering effect of the diffusion structure, reducing the influence of impurities on the membrane electrode, and improving the hydrogen production efficiency of the electrolytic cell. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0023] Figure 1 is the structural schematic diagram of the diffusion structure provided by the embodiment of the utility model;

[0024] Figure 2 is the structural schematic diagram of the diffusion structure provided by the embodiment of the utility model;

[0025] Figure 3 is Figure 2 is an enlarged view of part A in figure

[0026] Figure 4 is a structural schematic view of a diffusion structure provided by an embodiment of the present application;

[0027] Figure 5 is a structural schematic view of a diffusion structure provided by an embodiment of the present application;

[0028] Figure 6 is Figure 5 is an enlarged view of part B in figure

[0029] The respective numbers in the figures are:

[0030] 1. diffusion structure;

[0031] 11. wire mesh layer; 111. first mesh layer; 112. second mesh layer;

[0032] 12. first felt layer;

[0033] 13. second felt layer. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing in the drawings; and "inner" and "outer" refer to the contour of the device.

[0035] The diffusion layer is an important component in the electrolytic cell, and a plurality of small mesh holes are usually distributed on the diffusion layer at intervals to serve as air flow channels and liquid channels. However, the existing diffusion layer is usually made of nickel, which has low strength and cannot meet the operation and use under medium and high pressure conditions. If the thickness of the diffusion layer is increased, thicker metal wires need to be used for manufacturing, which increases the cost, and the thicker metal wires increase the difficulty of manufacturing the diffusion layer, and the size of the mesh holes on the diffusion layer is also increased, which reduces the filtering effect of the wire mesh layer, and large particle impurities in the fluid are easily accumulated on the membrane electrode, thereby affecting the hydrogen production efficiency of the electrolytic cell. The thick diffusion layer also easily occupies the installation space of other components in the electrolytic cell.

[0036] Based on this, referring to Figures 1 to 3 The utility model discloses a diffusion structure 1 for electrolytic cell, diffusion structure 1 includes: at least two silk screen layers 11;And at least one first felt layer 12, first felt layer 12 is connected between the two adjacent silk screen layers 11.

[0037] Silk screen layer 11 is the net structure that silklike material is connected in order, and first felt layer 12 is the net structure that silklike material is connected disorderly, and silk screen layer 11 can be formed by the sintering of metal wire according to certain structure, and the overall structure is orderly, so the hole in silk screen layer 11 is usually through-hole;First felt layer 12 can be formed by the sintering of metal fiber, so that first felt layer 12 has part blind hole, which makes first felt layer 12 more easily connect with silk screen layer 11.The orderly net structure of silk screen layer 11 makes the contact area of two silk screen layers 11 small when connecting directly, and the operation is difficult when connecting by welding or bonding, and the strength of the connecting part is low, which reduces the service life of electrolytic cell;Even if using clamping connection, since silk screen layer 11 itself includes a large number of cavities, the buckle structure is difficult to install on silk screen layer 11, and is prone to distortion, fracture and other problems.If only single silk screen structure is used, in order to improve the structural strength of diffusion structure 1, silk screen layer 11 needs to be made of metal wire with larger diameter, at this time the aperture of the hole in silk screen layer 11 is also larger;If first felt layer 12 is made thicker, the number of blind holes in first felt layer 12 increases greatly, which leads to the unsatisfactory air permeability of first felt layer 12, and is not conducive to the separation of oxygen and hydrogen.

[0038] Therefore, the utility model discloses that the felt layer with disordered net structure is used as the intermediate layer, since the fiber is distributed disorderly in the felt layer, macroscopically, the two sides of the felt layer are complete surfaces, so that the felt layer can be better combined with silk screen layer 11, and enough flow channels can be formed in the felt layer, so that the fluid can smoothly pass through the felt layer and flow to the membrane electrode, thereby reducing the influence on the hydrogen production efficiency of electrolytic cell. When in use, since the diffusion structure composed of the first silk screen layer 11, the first felt layer 12 and the second silk screen layer 11 has high structural strength and can bear higher pressure, the application range of the electrolytic cell made of the diffusion structure is improved;The fluid flows to the membrane electrode after flowing through the first silk screen layer 11, the first felt layer 12 and the second silk screen layer 11 in turn, and the impurities in the fluid can be better separated after three layers of filtration, thereby reducing the influence of the impurities on the membrane electrode, and improving the hydrogen production efficiency of the electrolytic cell.

[0039] The silk screen layer 11 and the first felt layer 12 can be connected by welding, bonding or other non-detachable connection modes, so that the stability of the connection between the silk screen layer 11 and the first felt layer 12 is improved; the silk screen layer 11 and the first felt layer 12 can also be connected by clamping, pin connection, bolt connection or other detachable connection modes, so that when a layer in the diffusion structure 1 has a problem, the layers in the diffusion structure 1 can be disassembled and separated, thereby facilitating the cleaning and replacement of the silk screen layer 11 or the first felt layer 12 and reducing the maintenance cost of the electrolytic cell. The shape and size of the silk screen layer 11 and the first felt layer 12 can be set according to design requirements, and the embodiments of the utility model do not limit this.

[0040] In some embodiments, the silk screen layer 11 and the first felt layer 12 are both provided with multiple layers, and the silk screen layer 11 and the first felt layer 12 are alternately arranged, so that the structure of the diffusion structure 1 is more stable, and the multi-layer design of the diffusion structure 1 is also beneficial to increasing the water vapor transmission and the contact between the diffusion structure 1 and the membrane electrode, thereby reducing the contact resistance and improving the electrolysis efficiency.

[0041] In some embodiments, the filtering precision of the first felt layer 12 is greater than the filtering precision of the silk screen layer 11, that is, the first felt layer 12 can filter smaller particles. At this time, when the fluid flows through the diffusion structure 1, the larger impurities are first intercepted by the silk screen layer 11, preventing the impurities from rapidly causing the blockage of the first felt layer 12 and greatly reducing the passing rate of the fluid; then the smaller impurities are intercepted by the first felt layer 12, improving the filtering effect of the diffusion structure 1 and further reducing the probability of the impurities affecting the membrane electrode. It can be understood that the filtering precisions of the silk screen layers 11 can be the same or different, and the embodiments of the utility model do not limit this.

[0042] The utility model discloses a first felt layer 12 is arranged between the two silk screen layers 11, so that the silk screen layer 11 is connected more stably through the first felt layer 12 with fewer surface cavities, thereby improving the structural strength of the diffusion structure 1 and enabling the diffusion structure 1 to play a better supporting role in the electrolytic cell. Moreover, the filtering precisions of the first felt layer 12 and the silk screen layer 11 can be adjusted to realize multi-layer filtration of the fluid, thereby improving the filtering effect of the diffusion structure 1, reducing the influence of impurities on the membrane electrode and improving the hydrogen production efficiency of the electrolytic cell.

[0043] In an embodiment, referring to Figures 4 to 6 The diffusion structure 1 further comprises at least one second felt layer 13, and the second felt layer 13 is connected to one side of the at least one silk screen layer 11 away from the first felt layer 12.

[0044] Since a large amount of hydrogen and oxygen will be generated in the process of electrolytic hydrogen production, if the first felt layer 12 is set to be thicker, the air permeability of the first felt layer 12 is poorer, which has a negative impact on the release of oxygen and hydrogen. Therefore, in the embodiment of the utility model, a second felt layer 13 is additionally arranged, at this time, the first felt layer 12 and the second felt layer 13 can be made into a thinner layer, thereby improving the air permeability of the diffusion structure 1. And the second felt layer 13 is additionally arranged, so that when the fluid flows through the diffusion structure 1, it needs to pass through at least four layers of filtration, thereby further improving the filtering effect of the diffusion structure 1.

[0045] In an embodiment, the filtering accuracy of the second felt layer 13 ranges from 8 μm to 12 μm.

[0046] If the filtering accuracy of the second felt layer 13 is less than 8 μm, the diameter of the hole in the second felt layer 13 needs to be reduced, which is difficult to manufacture and leads to high manufacturing cost. Moreover, the too small hole diameter has a great impact on the air permeability of the second felt layer 13, which further reduces the hydrogen production efficiency of the electrolytic tank. If the filtering accuracy of the second felt layer 13 is greater than 12 μm, the diameter of the hole in the second felt layer 13 is too large, which has a poor filtering effect on impurities of small size, so that the impurities easily affect the normal use of the membrane electrode, thereby reducing the hydrogen production efficiency of the electrolytic tank. Therefore, in the embodiment of the utility model, the filtering accuracy of the second felt layer 13 ranges from 8 μm to 12 μm, for example, it can be 8 μm, 8.5 μm, 9 μm, 9.5 μm, 10 μm, 10.5 μm, 11 μm, 11.5 μm, 12 μm, so that the second felt layer 13 has a good filtering effect while reducing the hindering effect of the second felt layer 13 on the permeation of hydrogen and oxygen, thereby ensuring that the electrolytic tank has high hydrogen production efficiency.

[0047] In an embodiment, the filtering accuracy of the first felt layer 12 is greater than the filtering accuracy of the second felt layer 13.

[0048] That is, compared with the second felt layer 13, the first felt layer 12 is used to filter impurities of larger size. For example, the diffusion structure 1 includes two silk screen layers 11, the first felt layer 12 and the second felt layer 13, in specific use, the installation direction of the diffusion structure 1 can be controlled, so that the fluid passes through the silk screen layer 11, the first felt layer 12, the silk screen layer 11 and the second felt layer 13 in turn. At this time, the first felt layer 12 first filters impurities of larger particles, and then the fluid flows through the second felt layer 13, during which the second felt layer 13 can filter impurities of smaller particles, thereby realizing layer-by-layer filtration of the fluid, reducing the probability of rapid accumulation and blockage of the second felt layer 13, and improving the filtering effect of the diffusion structure 1.

[0049] In an embodiment, the first felt layer 12 has a thickness ranging from 0.15 mm to 0.25 mm; and / or, the second felt layer 13 has a thickness ranging from 0.25 mm to 0.35 mm.

[0050] If the thickness of the first felt layer 12 is less than 0.15 mm, the first felt layer 12 is too thin and has weak structural strength, which results in poor connection between the first felt layer 12 and the wire mesh layer 11, and reduces the structural stability of the diffusion structure 1. If the thickness of the first felt layer 12 is greater than 0.25 mm, the first felt layer 12 is too thick and easily occupies the installation space of other components, which affects the thickness of the finished product. Therefore, in the embodiment of the present application, the thickness of the first felt layer 12 is set to range from 0.15 mm to 0.25 mm, for example, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, so that the first felt layer 12 and the wire mesh layer 11 can maintain good connection, and the thickness of the first felt layer 12 is moderate, thereby reducing the probability of affecting other components.

[0051] If the thickness of the second felt layer 13 is less than 0.25 mm, the thickness of the second felt layer 13 is too small, and the filtering precision of the second felt layer 13 is difficult to guarantee, which makes it easy for more impurities to flow to the membrane electrode along with the fluid. If the thickness of the second felt layer 13 is greater than 0.35 mm, the thickness of the second felt layer 13 is too large and easily occupies the installation space of other components, and the air permeability of the second felt layer 13 is also low, which makes it difficult for oxygen and hydrogen to pass through. Therefore, in the embodiment of the present application, the thickness of the second felt layer 13 is set to range from 0.15 mm to 0.25 mm, for example, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, so that the second felt layer 13 can maintain accurate filtering precision, and the air permeability of the second felt layer 13 is also good.

[0052] In an embodiment, referring to Figure 3 , the at least two wire mesh layers 11 include at least one first mesh layer 111 and at least one second mesh layer 112, the first mesh layer 111 has a smaller mesh count than the second mesh layer 112, and the second felt layer 13 is connected to the second mesh layer 112 away from the first felt layer 12.

[0053] The mesh number of the first mesh layer 111 is less than the mesh number of the second mesh layer 112, that is, the second mesh layer 112 has more meshes, and the size of the meshes of the second mesh layer 112 is smaller than that of the first mesh layer 111, so that the second mesh layer 112 is more likely to filter smaller impurities. At this time, the second felt layer 13 is arranged to be connected to the side of the second mesh layer 112 away from the first felt layer 12, so that when the fluid flows through the diffusion structure 1, it passes through the first mesh layer 111, the first felt layer 12, the second mesh layer 112, and the second felt layer 13 in sequence. The diffusion structure 1 can filter impurities of different sizes from large to small, avoid large-particle impurities from blocking the subsequent medium for finer filtration, improve the filtering effect of the diffusion structure 1, and prolong the service life of the diffusion structure 1.

[0054] In an embodiment, referring to Figure 3 and Figure 6 , the mesh number of the first mesh layer 111 ranges from 20 to 25; and / or,

[0055] the mesh number of the second mesh layer 112 ranges from 40 to 50; and / or,

[0056] the ratio of the mesh number of the first mesh layer 111 to the mesh number of the second mesh layer 112 ranges from 0.4 to 0.6.

[0057] If the mesh number of the first mesh layer 111 is less than 20, the first mesh layer 111 cannot effectively filter the fluid, and at this time, the size of the cavities of the first mesh layer 111 is larger, and the connection strength between the first mesh layer 111 and the first felt layer 12 is smaller, which reduces the structural stability of the diffusion structure 1. If the mesh number of the first mesh layer 111 is greater than 25, the size of the cavities of the first mesh layer 111 is smaller, which causes excessive impurities to accumulate on the first mesh layer 111, thereby reducing the service life of the diffusion structure 1. Therefore, in the embodiments of the present application, the mesh number of the first mesh layer 111 ranges from 20 to 25, for example, 20, 21, 22, 23, 24, or 25, so that the first mesh layer 111 and the first felt layer 12 can be better connected, and at the same time, the first mesh layer 111 can filter impurities of appropriate size, thereby reducing the probability of rapid clogging of the first mesh layer 111.

[0058] If the mesh number of the second mesh layer 112 is less than 40 meshes, the filtering precision of the second mesh layer 112 and the first felt layer 12 is relatively close, and the fluid cannot be filtered layer by layer, thereby reducing the filtering effect of the diffusion structure 1; if the mesh number of the second mesh layer 112 is greater than 50 meshes, the second mesh layer 112 needs to be woven by using a smaller diameter of woven wire, and the strength of the second mesh layer 112 is low, and the manufacturing cost is high. Therefore, in the embodiment of the utility model, the mesh number range of the second mesh layer 112 is set to be between 40 meshes and 50 meshes, for example, it can be 40 meshes, 41 meshes, 42 meshes, 43 meshes, 44 meshes, 45 meshes, 46 meshes, 47 meshes, 48 meshes, 49 meshes and 50 meshes, so that the second mesh layer 112 can filter impurities of appropriate size, and meanwhile, the strength of the second mesh layer 112 is high, and the manufacturing cost of the second mesh layer 112 is reduced.

[0059] If the mesh number ratio of the first mesh layer 111 and the second mesh layer 112 is less than 0.4, the mesh number difference between the first mesh layer 111 and the second mesh layer 112 is too large, the overlapping part between the woven wire of the first mesh layer 111 and the woven wire of the second mesh layer 112 is small, and the supporting strength of the diffusion structure 1 is reduced; if the mesh number ratio of the first mesh layer 111 and the second mesh layer 112 is greater than 0.6, the filtering precision of the first mesh layer 111 and the second mesh layer 112 is relatively close, and the fluid cannot be filtered layer by layer. Therefore, in the embodiment of the utility model, the mesh number ratio of the first mesh layer 111 and the second mesh layer 112 is set to be between 0.4 and 0.6, for example, it can be 0.4, 0.45, 0.5, 0.55 and 0.6, so that the first mesh layer 111 and the second mesh layer 112 have good supporting distribution, and the filtering precision of the first felt layer 12 is adjusted, thereby the fluid is better filtered.

[0060] In an embodiment, the first felt layer 12 and the second felt layer 13 are one of a nickel felt layer, a nickel alloy felt layer, a ceramic material felt layer, a glass fiber felt layer or a stainless steel felt layer. For example, the first felt layer 12 and the second felt layer 13 can be stainless steel felt layers. Since the fluid used in some electrolytic cells is concentrated lye, the first felt layer 12 and the second felt layer 13 are set to be stainless steel felt layers, so that the first felt layer 12 and the second felt layer 13 can be used for a long time in an alkaline environment, thereby improving the safety and stability of the diffusion structure 1; and the cost of stainless steel material is lower than that of titanium metal and other materials, which is conducive to large-scale production of the diffusion structure 1. It can be understood that the materials of the first felt layer 12 and the second felt layer 13 can be the same or different, and the embodiment of the utility model does not limit this.

[0061] In an embodiment, the at least two wire mesh layers 11 are sintered to the at least one first felt layer 12. The sintering connection makes the connecting part of the wire mesh layer 11 and the first felt layer 12 form an entirety, with high connection strength, thereby reducing the probability of delamination, peeling and other phenomena between the wire mesh layer 11 and the first felt layer 12, and ensuring the structural stability of the diffusion structure 1.

[0062] According to the second aspect of the present application, an electrolytic cell is provided, comprising the diffusion structure 1 in the foregoing embodiments. Since the electrolytic cell comprises the diffusion structure 1 described above, the electrolytic cell has all the beneficial effects of the diffusion structure 1 described above, and the embodiments of the present application will not be described here. Among them, the electrolytic cell can be a cation exchange membrane electrolytic cell, and since the diffusion structure 1 has high support performance, it can be used in an environment with a pressure of 0.5 MPa or more, thereby expanding the application range of the cation exchange membrane electrolytic cell.

[0063] The embodiments of the present application are described in detail above, and the principles and implementation modes of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. A diffusion structure, characterized by, The diffusion structure comprises: at least two layers of wire mesh layers; and at least one first felt layer connected between two adjacent layers of the wire mesh layers.

2. The diffusion structure of claim 1, wherein The diffusion structure further comprises at least one second felt layer connected to a side of at least one of the wire mesh layers away from the first felt layer.

3. The diffusion structure of claim 2, wherein, The second felt layer has a filtering precision in a range of 8 μm to 12 μm.

4. The diffusion structure of claim 2, wherein, The first felt layer has a filtering precision greater than that of the second felt layer.

5. The diffusion structure of claim 2, wherein, The first felt layer has a thickness in a range of 0.15 mm to 0.25 mm; and / or The second felt layer has a thickness in a range of 0.25 mm to 0.35 mm.

6. The diffusion structure of claim 2, wherein, The at least two layers of wire mesh layers comprise at least one first mesh layer and at least one second mesh layer, the first mesh layer has a mesh count less than that of the second mesh layer, and the second felt layer is connected to a side of the second mesh layer away from the first felt layer.

7. The diffusion structure of claim 6, wherein, The first mesh layer has a mesh count in a range of 20 mesh to 25 mesh; and / or The second mesh layer has a mesh count in a range of 40 mesh to 50 mesh; and / or The first mesh layer and the second mesh layer have a mesh count ratio in a range of 0.4 to 0.

6.

8. Diffusion structure according to any one of claims 2 to 7, characterized in that The first felt layer and the second felt layer are one of a nickel felt layer, a nickel alloy felt layer, a ceramic material felt layer, a glass fiber felt layer, or a stainless steel felt layer.

9. Diffusion structure according to any one of claims 1 to 7, characterized in that The at least two layers of wire mesh layers and the at least one first felt layer are sintered together.

10. An electrolytic cell characterized in that, A diffusion structure as claimed in any one of claims 1 to 9. A diffusion structure as claimed in any one of claims 1 to 9.

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