Electrolyzed water single battery device for measuring dissolution amount of precious metal of membrane electrode
By using gold-plated plates and non-metallic material interfaces in the single-cell water electrolysis device, the problem of inaccurate dissolution measurement caused by precious metal deposition is solved, and accurate measurement and low-cost testing of precious metal dissolution are achieved, supporting the research and development of catalysts.
Patent Information
- Application Number
- CN202521657389.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-06
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2035-08-06
AI Technical Summary
In the prior art, conventional single-cell devices have the problem of inaccurate dissolution measurement due to precious metal deposition when measuring the amount of precious metal dissolution in membrane electrodes, and it is difficult to meet the requirements of low cost and no introduction of pollutants.
A single-cell water electrolysis device was designed, which uses gold-plated anode and cathode plates, combined with non-metallic PEEK components and PTFE spiral interfaces to ensure that the dissolved precious metals circulate in the non-metallic materials to avoid deposition, while maintaining the openness and conductivity of the electrolyte.
It achieves accurate determination of the amount of precious metal dissolution in membrane electrodes, reduces costs and avoids precious metal deposition, provides a stable testing environment, and provides technical support for the research and development of new water electrolysis catalysts.
Smart Images
Figure CN223347790U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of measuring the amount of metal dissolution in a membrane electrode, in particular to a water electrolysis single cell device for measuring the amount of precious metal dissolution in a membrane electrode. Background Art
[0002] Proton exchange membrane water electrolysis is a key technology for producing green hydrogen from renewable energy. It consists of a hydrogen evolution reaction on the cathode side and an oxygen evolution reaction on the anode side. On the anode side, the electrocatalyst is in strongly acidic and oxidizing conditions for a long time, and is prone to corrosion and dissolution. Therefore, it is imperative to develop a stable oxygen evolution reaction catalyst.
[0003] The development of efficient and stable catalysts is inseparable from a clear understanding of the dissolution patterns of active substances, which means that the loss of active substances needs to be accurately monitored under operating conditions. Currently, the main way to detect the amount of precious metal dissolution is to test the precious metal concentration in the electrolyte under the operating conditions of traditional single cells. However, when precious metals are dissolved in the electrolyte, due to their high reduction potential, they may undergo a replacement reaction with non-inert metal components in the single cell and deposit on the surface, resulting in the amount of precious metal dissolution measured in the solution being lower than the actual value. Therefore, in traditional single cells, it is difficult to accurately measure the amount of precious metal dissolution.
[0004] In order to avoid the inability to accurately measure the dissolution amount due to the deposition of precious metals, it is necessary to select components that cannot undergo replacement reactions with precious metal ions to construct a single water electrolysis cell. In addition, the constructed single cell must also ensure that the intrinsic resistance is small, no pollutants are introduced during the test process, and the cost is low. Utility Model Content
[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a water electrolysis single cell device for measuring the amount of noble metal dissolution from a membrane electrode.
[0006] A water electrolysis cell device for measuring the amount of noble metal dissolved out of a membrane electrode, the water electrolysis cell device comprising: a stainless steel anode terminal plate, an anode PEEK assembly, a gold-plated anode plate, an anode diffusion layer, a membrane electrode, a cathode diffusion layer, a gold-plated cathode plate, a cathode PEEK assembly and a stainless steel cathode terminal plate, wherein the gold-plated anode plate is provided with an anode flow channel, the gold-plated cathode plate is provided with a cathode flow channel, the anode PEEK assembly is provided with an anode first water flow hole, an anode second water flow hole, an anode PTFE spiral water inlet and an anode PTFE Spiral water outlet, the first water flow hole of the anode is located above the second water flow hole of the anode, the first water flow hole of the anode is connected to the anode PTFE spiral water inlet, the second water flow hole of the anode is connected to the anode PTFE spiral water outlet, the cathode PEEK component is provided with a cathode first water flow hole, a cathode second water flow hole, a cathode PTFE spiral water inlet and a cathode PTFE spiral water outlet, the first water flow hole of the cathode is located above the second water flow hole of the cathode, the first water flow hole of the cathode is connected to the cathode PTFE spiral water inlet, and the second water flow hole of the cathode is connected to the cathode PTFE spiral water outlet.
[0007] Furthermore, the first anode water flow hole and the second anode water flow hole both correspond to the position of the anode flow channel, and the first cathode water flow hole and the second cathode water flow hole both correspond to the position of the cathode flow channel.
[0008] Furthermore, the anode PTFE spiral water inlet is located on the side of the anode PEEK component, and the cathode PTFE spiral water inlet is located on the side of the cathode PEEK component.
[0009] Furthermore, a hollow through groove is provided on the stainless steel anode end plate.
[0010] Furthermore, a hollow through groove is provided on the stainless steel cathode end plate.
[0011] Furthermore, the stainless steel anode terminal plate, anode PEEK assembly, gold-plated anode plate, anode diffusion layer, membrane electrode, cathode diffusion layer, gold-plated cathode plate, cathode PEEK assembly and stainless steel cathode terminal plate are sequentially connected by bolts.
[0012] Furthermore, the cross-sectional area of the anode flow channel opened on the gold-plated anode plate is 4 square centimeters.
[0013] Furthermore, the cross-sectional area of the cathode flow channel opened on the gold-plated cathode plate is 4 square centimeters.
[0014] Furthermore, an anode connection hole is provided on the gold-plated anode plate, and the anode connection hole is located on the top of the gold-plated anode plate.
[0015] Furthermore, a cathode connection hole is provided on the gold-plated cathode plate, and the cathode connection hole is located on the top of the gold-plated cathode plate.
[0016] The technical solution of this utility model has the following advantages:
[0017] In the technical solution provided by the present utility model, an anode PEEK component is provided to separate the gold-plated anode plate from the anode PTFE spiral water inlet and the anode PTFE spiral water outlet, and a cathode PEEK component is provided to separate the gold-plated cathode plate from the cathode PTFE spiral water inlet and the cathode PTFE spiral water outlet. The control of water inlet and outflow is carried out in the anode PEEK component and the cathode PEEK component made of non-metallic materials, and the circulation of water or electrolyte is achieved by utilizing the first anode water flow hole, the second anode water flow hole, the first cathode water flow hole, the second cathode water flow hole, the cathode flow channel and the anode flow channel. The test is carried out on the basis of ensuring that the gold-plated anode plate and the gold-plated cathode plate are completely open, thereby realizing the accurate determination of the amount of precious metal dissolution of the membrane electrode. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0019] Figure 1 This is a schematic diagram of the overall structure of the utility model;
[0020] Figure 2 This is a schematic structural diagram of the stainless steel anode end plate of the utility model;
[0021] Figure 3 This is a schematic structural diagram of the stainless steel cathode end plate of the utility model;
[0022] Figure 4 This is a schematic structural diagram of the anode PEEK component of the utility model;
[0023] Figure 5 This is a schematic structural diagram of the cathode PEEK component of the utility model;
[0024] Figure 6 This is a schematic structural diagram of the gold-plated anode plate of the utility model;
[0025] Figure 7 This is a schematic structural diagram of the gold-plated cathode plate of the utility model.
[0026] Description of reference numerals:
[0027] 1-stainless steel anode end plate; 2-anode PEEK assembly; 3-gold-plated anode plate; 4-anode diffusion layer; 5-membrane electrode; 6-cathode diffusion layer; 7-gold-plated cathode plate; 8-cathode PEEK assembly; 9-stainless steel cathode end plate; 10-anode PTFE spiral water inlet; 11-cathode flow channel; 12-cathode first water flow hole; 13-cathode PTFE spiral water inlet; 14-anode flow channel; 15-anode first water flow hole; 16-anode second water flow hole; 17-anode PTFE spiral water outlet; 18-cathode second water flow hole; 19-cathode PTFE spiral water outlet; 20-anode wiring hole; 21-cathode wiring hole. DETAILED DESCRIPTION
[0028] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.
[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0030] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0031] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0032] like Figures 1 to 7The present invention shows a single-cell electrolysis device for measuring the amount of precious metal dissolution from a membrane electrode, the single-cell electrolysis device comprising: a stainless steel anode terminal plate 1, an anode PEEK assembly 2, a gold-plated anode plate 3, an anode diffusion layer 4, a membrane electrode 5, a cathode diffusion layer 6, a gold-plated cathode plate 7, a cathode PEEK assembly 8 and a stainless steel cathode terminal plate 9, which are connected in sequence laterally. The gold-plated anode plate 3 is provided with an anode flow channel 14, the gold-plated cathode plate 7 is provided with a cathode flow channel 11, the anode PEEK assembly 2 is provided with an anode first water flow hole 15, an anode second water flow hole 16, an anode PTFE spiral water inlet 10 and an anode P TFE spiral water outlet 17, the anode first water hole 15 is located above the anode second water hole 16, the anode first water hole 15 is connected to the anode PTFE spiral water inlet 10, the anode second water hole 16 is connected to the anode PTFE spiral water outlet 17, the cathode PEEK component 8 is provided with a cathode first water hole 12, a cathode second water hole 18, a cathode PTFE spiral water inlet 13 and a cathode PTFE spiral water outlet 19, the cathode first water hole 12 is located above the cathode second water hole 18, the cathode first water hole 12 is connected to the cathode PTFE spiral water inlet 13, the cathode second water hole 18 It is connected to the cathode PTFE spiral water outlet 19, the gold-plated anode plate 3 and the gold-plated cathode plate 7 are both made of metal titanium material, the anode PEEK component 2, the cathode PEEK component 8, the anode PTFE spiral water inlet 10, the anode PTFE spiral water outlet 17, the cathode PTFE spiral water inlet 13 and the cathode PTFE spiral water outlet 19 are all made of non-metallic materials. Such material setting can effectively avoid the deposition of dissolved precious metals, thereby accurately measuring the dissolution amount. At the same time, the selection of metal materials for the gold-plated anode plate 3 and the gold-plated cathode plate 7 also ensures good electronic conductivity of the electrolytic cell, and the gold-plated layer has excellent The high oxidation potential makes it difficult to replace the precious metals dissolved in the membrane electrode, which can avoid the problem of inaccurate dissolution measurement. The anode PEEK component 2, the cathode PEEK component 8, the anode PTFE spiral water inlet 10, the anode PTFE spiral water outlet 17, the cathode PTFE spiral water inlet 13 and the cathode PTFE spiral water outlet 19 are all made of non-metallic materials instead of traditional stainless steel materials, which can avoid the deposition of precious metals while reducing costs and processing difficulty. The PTFE and PEEK materials selected for the water electrolysis single cell device will not produce interfering impurities under the test temperature and pressure conditions.
[0033] The above-mentioned single-cell water electrolysis device for measuring the amount of precious metal dissolution from the membrane electrode is provided with an anode PEEK component 2 to separate the gold-plated anode plate 3 from the anode PTFE spiral water inlet 10 and the anode PTFE spiral water outlet 17, and at the same time, a cathode PEEK component 8 is provided to separate the gold-plated cathode plate 7 from the cathode PTFE spiral water inlet 13 and the cathode PTFE spiral water outlet 19. The water inlet and outlet are controlled in the anode PEEK component 2 and the cathode PEEK component 8 made of non-metallic materials, and the circulation of water or electrolyte is achieved by using the anode first water flow hole 15, the anode second water flow hole 16, the cathode first water flow hole 12, the cathode second water flow hole 18, the cathode flow channel 11 and the anode flow channel 14. The test is carried out on the basis of ensuring that the gold-plated anode plate 3 and the gold-plated cathode plate 7 are completely open, thereby achieving accurate measurement of the amount of precious metal dissolution from the membrane electrode, thereby providing technical support for the research and development of new water electrolysis catalysts.
[0034] like Figure 1 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, in this embodiment, the first anode water hole 15 and the second anode water hole 16 both correspond to the position of the anode flow channel 14, and the first cathode water hole 12 and the second cathode water hole 18 both correspond to the position of the cathode flow channel 11; the above arrangement ensures the circulation of water, and the anode water flows into the anode flow channel 14 through the first anode water hole 15 located above, and after passing through the flow channel, the water reaches the lower part of the gold-plated anode plate 3, and then the water flows back to the anode PEEK component 2 from the second anode water hole 16 located on the lower side. Finally, it flows out from the anode PTFE spiral water outlet 17. The principles and processes of the cathode first water hole 12 and the cathode second water hole 18 are the same as those of the anode first water hole 15 and the anode second water hole 16. The cathode water flows into the cathode flow channel 11 through the cathode first water hole 12 located above. After passing through the flow channel, the water reaches the lower part of the gold-plated cathode plate 7. Then, the water flows back to the cathode PEEK component 8 from the cathode second water hole 18 located on the lower side, and finally flows out from the cathode PTFE spiral water outlet 19.
[0035] like Figure 1 、 Figure 4 and Figure 5As shown, in this embodiment, the anode PTFE spiral water inlet 10 is located on the side of the anode PEEK component 2, and the cathode PTFE spiral water inlet 13 is located on the side of the cathode PEEK component 8; the anode PTFE spiral water outlet 17 is located on the side of the anode PEEK component 2, and the cathode PTFE spiral water outlet 19 is located on the side of the cathode PEEK component 8. The anode water flows into the anode PEEK component 2 from the anode PTFE spiral water inlet 10 and finally flows out from the anode PTFE spiral water outlet 17, and the cathode water flows out from the cathode The PTFE spiral water inlet 13 flows into the cathode PEEK component 8 and finally flows out from the cathode PTFE spiral water outlet 19. The anode first water flow hole 15, the anode second water flow hole 16, the anode PTFE spiral water inlet 10 and the anode PTFE spiral water outlet 17 opened on the anode PEEK component 2, and the cathode first water flow hole 12, the cathode second water flow hole 18, the cathode PTFE spiral water inlet 13 and the cathode PTFE spiral water outlet 19 opened on the cathode PEEK component 8 are all used for electrolyte transfer.
[0036] like Figures 1 to 3 As shown, in this embodiment, a hollow through groove is provided on the stainless steel anode end plate 1; a hollow through groove is provided on the stainless steel cathode end plate 9; the hollow through groove can be used as an in-situ observation hole to observe the internal situation of the device. At the same time, the design of the hollow through groove also helps to reduce the material application of the stainless steel anode end plate 1 and the stainless steel cathode end plate 9, thereby reducing the cost of the device. The stainless steel anode end plate 1 and the stainless steel cathode end plate 9 fix the entire water electrolysis single cell device to avoid electrolyte leakage during the test.
[0037] like Figures 1 to 7 As shown, in this embodiment, the stainless steel anode end plate 1, the anode PEEK assembly 2, the gold-plated anode plate 3, the anode diffusion layer 4, the membrane electrode 5, the cathode diffusion layer 6, the gold-plated cathode plate 7, the cathode PEEK assembly 8 and the stainless steel cathode end plate 9 are connected in sequence by bolts and nuts. The use of bolts and nuts can achieve a tight connection between the various components and avoid leakage during the test process. Corresponding screw holes are opened at the four vertices of each component for cooperating with the bolts to achieve a tight connection.
[0038] like Figure 1 、 Figure 6 and Figure 7 As shown, in this embodiment, the cross-sectional area of the anode flow channel 14 opened on the gold-plated anode plate 3 is 4 square centimeters; the cross-sectional area of the cathode flow channel 11 opened on the gold-plated cathode plate 7 is 4 square centimeters; the anode flow channel 14 and the cathode flow channel 11 are utilized to ensure the transmission, diffusion and circulation of the electrolyte and gas, wherein the cross-sectional area of 4 square centimeters is the effective area.
[0039] like Figure 1 、 Figure 6and Figure 7 As shown, in this embodiment, the gold-plated anode plate 3 is further provided with an anode wiring hole 20, which is located at the top of the gold-plated anode plate 3; the gold-plated cathode plate 7 is further provided with a cathode wiring hole 21, which is located at the top of the gold-plated cathode plate 7; the anode wiring hole 20 and the cathode wiring hole 21 serve as electrode terminals for wiring, wherein the anode wiring hole 20 is directly connected to the anode of the power supply, and the cathode wiring hole 21 is directly connected to the cathode of the power supply.
[0040] like Figures 1 to 7 As shown in this embodiment, in the specific test, it is necessary to first prepare a membrane electrode with the catalyst to be tested, and a conventional transfer method can be used. The transfer method is an existing technology and will not be described here. Then, according to Figure 1 As shown, the stainless steel anode end plate 1, the anode PEEK assembly 2, the gold-plated anode plate 3, the anode diffusion layer 4, the membrane electrode 5, the cathode diffusion layer 6, the gold-plated cathode plate 7, the cathode PEEK assembly 8 and the stainless steel cathode end plate 9 are connected in sequence transversely by bolts and nuts to achieve fastening. During the actual test, the anode wiring hole 20 is directly connected to the anode of the power supply, and the cathode wiring hole 21 is directly connected to the cathode of the power supply. Then, the anode water flows into the anode flow channel 14 through the anode first water flow hole 15 located above. After passing through the flow channel, the water flows to the lower part of the gold-plated anode plate 3, and then the water flows from the lower part. The cathode water flows into the cathode flow channel 11 through the cathode first flow hole 12 located above, and reaches the lower part of the gold-plated cathode plate 7 after passing through the flow channel. Then, the water flows back to the cathode PEEK component 8 from the cathode second flow hole 18 located below, and finally flows out from the cathode PTFE spiral water outlet 19.
[0041] In the water electrolysis single cell device, since the metal ions dissolved by the membrane electrode are usually precious metals, such as Pt, Ir, etc., the activity order of these ions is very low, so they may be replaced with metal structural components with a high metal activity order and cause deposition, making it impossible to accurately measure the amount of metal dissolved. Therefore, a PTFE spiral interface is used instead of an ordinary stainless steel interface, and the plate is gold-plated at the same time. The metal activity order of Au is very low, which can avoid the re-deposition of precious metal ions. In the traditional electrolytic cell, the anode plate and the water inlet and outlet are integrated, which means that even if the plate is gold-plated, some channels cannot be completely covered by the gold layer, and it is impossible to observe whether the Au layer has fallen off during the test. Therefore, the gold-plated anode PEEK component 2 is set The anode plate 3 is separated from the anode PTFE spiral water inlet 10 and the anode PTFE spiral water outlet 17. At the same time, a cathode PEEK component 8 is provided to separate the gold-plated cathode plate 7 from the cathode PTFE spiral water inlet 13 and the cathode PTFE spiral water outlet 19. The water inlet and outlet are controlled in the anode PEEK component 2 and the cathode PEEK component 8 made of non-metallic materials. The anode first water flow hole 15, the anode second water flow hole 16, the cathode first water flow hole 12, the cathode second water flow hole 18, the cathode flow channel 11 and the anode flow channel 14 are used to realize the circulation of water or electrolyte. The test is carried out on the basis of ensuring that the gold-plated anode plate 3 and the gold-plated cathode plate 7 are fully open, thereby realizing the accurate determination of the amount of precious metal dissolution of the membrane electrode, thereby providing technical support for the research and development of new water electrolysis catalysts.
[0042] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.
Claims
1. A water electrolysis cell device for measuring the amount of noble metal dissolution from a membrane electrode, characterized in that: The water electrolysis single cell device comprises: a stainless steel anode terminal plate (1), an anode PEEK assembly (2), a gold-plated anode plate (3), an anode diffusion layer (4), a membrane electrode (5), a cathode diffusion layer (6), a gold-plated cathode plate (7), a cathode PEEK assembly (8) and a stainless steel cathode terminal plate (9) which are connected in sequence transversely. An anode flow channel (14) is provided on the gold-plated anode plate (3), a cathode flow channel (11) is provided on the gold-plated cathode plate (7), a first anode water flow hole (15), a second anode water flow hole (16), an anode PTFE spiral water inlet (10) and an anode PTFE spiral water outlet (17) are provided on the anode PEEK assembly (2), and the first anode water flow hole (15) is provided on the anode PEEK assembly (2). ) is located above the anode second water flow hole (16), the anode first water flow hole (15) is connected to the anode PTFE spiral water inlet (10), the anode second water flow hole (16) is connected to the anode PTFE spiral water outlet (17), and the cathode PEEK component (8) is provided with a cathode first water flow hole (12), a cathode second water flow hole (18), a cathode PTFE spiral water inlet (13) and a cathode PTFE spiral water outlet (19), the cathode first water flow hole (12) is located above the cathode second water flow hole (18), the cathode first water flow hole (12) is connected to the cathode PTFE spiral water inlet (13), and the cathode second water flow hole (18) is connected to the cathode PTFE spiral water outlet (19).
2. A water electrolysis cell device for measuring the amount of noble metal dissolution from a membrane electrode according to claim 1, characterized in that: The first anode water flow hole (15) and the second anode water flow hole (16) both correspond to the positions of the anode flow channel (14), and the first cathode water flow hole (12) and the second cathode water flow hole (18) both correspond to the positions of the cathode flow channel (11).
3. The water electrolysis single cell device for measuring the amount of noble metal dissolution from a membrane electrode according to claim 1, characterized in that: The anode PTFE spiral water inlet (10) is located on the side of the anode PEEK component (2), and the cathode PTFE spiral water inlet (13) is located on the side of the cathode PEEK component (8).
4. The water electrolysis single cell device for measuring the amount of noble metal dissolution from a membrane electrode according to claim 1, characterized in that: The stainless steel anode end plate (1) is provided with a hollow through groove.
5. The water electrolysis single cell device for measuring the amount of noble metal dissolution from a membrane electrode according to claim 1, characterized in that: The stainless steel cathode end plate (9) is provided with a hollow through groove.
6. The water electrolysis single cell device for measuring the amount of noble metal dissolution from a membrane electrode according to claim 1, characterized in that: The stainless steel anode terminal plate (1), the anode PEEK assembly (2), the gold-plated anode plate (3), the anode diffusion layer (4), the membrane electrode (5), the cathode diffusion layer (6), the gold-plated cathode plate (7), the cathode PEEK assembly (8) and the stainless steel cathode terminal plate (9) are connected in sequence by bolts.
7. The water electrolysis single cell device for measuring the amount of noble metal dissolution from a membrane electrode according to claim 1, characterized in that: The cross-sectional area of the anode flow channel (14) opened on the gold-plated anode plate (3) is 4 square centimeters.
8. The water electrolysis single cell device for measuring the amount of noble metal dissolution from a membrane electrode according to claim 1, characterized in that: The cross-sectional area of the cathode flow channel (11) opened on the gold-plated cathode plate (7) is 4 square centimeters.
9. The water electrolysis single cell device for measuring the amount of noble metal dissolution from a membrane electrode according to claim 1, characterized in that: The gold-plated anode plate (3) is also provided with an anode connection hole (20), and the anode connection hole (20) is located at the top of the gold-plated anode plate (3).
10. The water electrolysis single cell device for measuring the amount of noble metal dissolution from a membrane electrode according to claim 1, characterized in that: The gold-plated cathode plate (7) is also provided with a cathode connection hole (21), and the cathode connection hole (21) is located at the top of the gold-plated cathode plate (7).