Variable-frequency sine wave flow field for AEM electrolytic bath

Abstract

The variable-frequency sine wave flow field structure comprises a flow field body, a liquid inlet is formed in the front portion of the flow field body, a liquid outlet is formed in the rear portion of the flow field body, gas guide openings are formed in the left side and the right side of the flow field body, a plurality of wave-shaped flow channels are formed in the central area of the flow field, and the two ends of each wave-shaped flow channel communicate with the liquid inlet and the liquid outlet correspondingly. The wave-shaped flow channel is of a variable-frequency sine wave-shaped structure, the wavelength of the wave-shaped flow channel is gradually reduced in the fluid flowing direction, and therefore the wave shape is gradually encrypted from front to back, by arranging the variable-frequency sine wave-shaped flow channel, it is guaranteed that fluid is evenly distributed, meanwhile, convection disturbance is enhanced, and reactant mass transfer and gas-liquid separation efficiency improvement in the electrolysis process are facilitated. The device is simple in structure, reasonable in arrangement and suitable for flow field design and optimization of the AEM electrolytic cell.

Description

Technical Field

[0001] This application relates to the field of flow fields in electrolytic cells, and in particular to a variable frequency sinusoidal wave flow field structure for AEM electrolytic cells. Background Technology

[0002] Electrolyte plates are one of the core components of an AEM electrolyzer, and the design of their surface flow field structure is crucial. The flow field not only plays a role in uniformly transporting reactants (water) to the surface of the electrode catalyst layer and promptly removing products (hydrogen and oxygen), but also directly affects the current distribution, mass transfer efficiency, concentration polarization, temperature field uniformity, and operating voltage drop inside the electrolyzer.

[0003] Currently, the flow field design of AEM electrolyzers largely draws on mature PEM electrolyzers or fuel cell flow fields, such as parallel flow fields, point flow fields, or interdigitated flow fields. However, the operating environment of an AEM electrolyzer is unique: the alkaline environment of an AEM may increase the interfacial tension of bubbles, making them more prone to coalescing into larger bubbles; while the acidic environment of a PEM and the surface characteristics of noble metal catalysts may result in smaller and more densely distributed bubbles. Furthermore, in an AEM electrolyzer, if the electrolyte contains carbonates (such as those generated by the reaction of CO2 and OH⁻ in the air), it will increase the viscosity of the electrolyte, hindering bubble detachment.

[0004] When the flow field structure of a traditional PEM electrolyzer is applied to an AEM cell, its efficiency in removing bubbles generated during electrolysis is limited at low flow rates. Large bubbles tend to become trapped in the flow channels or catalyst layer pores, hindering the transport of reactant water, leading to localized "drying out" or coverage of reaction sites, increasing overpotential and energy consumption. Furthermore, to remove large bubbles, the power of the electrolyte circulation pump needs to be increased to raise the flow rate, but this reduces the system's net energy efficiency. Additionally, the difference in reactant supply between the flow channels and the ridge (land) region can easily lead to uneven current density distribution; localized hot spots or overloads may accelerate the degradation of the membrane electrode, affecting its lifespan.

[0005] Based on the above situation, those skilled in the art have designed a wave-shaped flow field, such as patent document CN202311351539.7. However, this type of wave-shaped flow field has the following drawbacks: the flow channel with uniform density of the front and rear waveforms cannot be well adapted to the working conditions where there are fewer and smaller bubbles on the front side of the flow channel and more and larger bubbles on the rear side of the flow channel. Furthermore, the more waveforms there are, the higher the production cost.

[0006] For the reasons mentioned above, this application provides a variable frequency sinusoidal wave flow field for AEM electrolytic cells. Summary of the Invention

[0007] To address the aforementioned technical problems, this application provides a variable frequency sinusoidal wave flow field for AEM electrolyzers.

[0008] The technical solution for a variable frequency sinusoidal wave flow field in an AEM electrolytic cell provided in this application is as follows: A variable frequency sinusoidal wave flow field structure for an AEM electrolyzer includes a flow field, with an inlet at the front and an outlet at the rear, and air guides on the left and right sides. Several wave-shaped channels are located at the center of the flow field, with the inlet and outlet connected to their respective ends. The waveform of the wave-shaped channels gradually densifies from front to back.

[0009] By adopting the above technical solution, a variable frequency sinusoidal wave-shaped flow channel structure with gradually increasing waveform density from front to back is introduced into the flow field of the AEM electrolyzer. This creates continuous and enhanced disturbance in the electrolyte during flow, effectively improving the uniformity of fluid distribution and reducing the generation of local dead zones. At the same time, it facilitates the timely discharge of gases generated during the reaction, reduces the probability of bubbles remaining on the electrode surface, thereby improving mass transfer efficiency and electrolytic reaction stability, and ultimately enhancing the overall operating efficiency and reliability of the electrolyzer.

[0010] Optionally, the shape of the wave-shaped flow channel conforms to the frequency conversion sine function y(x)=A*sin([k0+(k1-k0)*(x / L)]*x+φ); the wave-shaped flow channel is a frequency conversion sine waveform structure, and its wavelength gradually decreases along the flow direction; Where A refers to the amplitude coefficient, k0 refers to the starting wavelength, k1 refers to the ending wavelength, x refers to the current position, L refers to the theoretical length, and φ refers to the phase.

[0011] By adopting the above technical solution, the wave-shaped flow channel is designed as a variable frequency sinusoidal waveform structure with the wavelength gradually decreasing along the flow direction. This can create a gradual turbulence effect from weak to strong during fluid flow, allowing the electrolyte to obtain differentiated flow states in different regions, effectively improving the fluid renewal rate and mass transfer efficiency. At the same time, it avoids local energy loss and flow turbulence caused by abrupt structural changes, thereby enhancing gas-liquid separation capability while ensuring flow stability, and improving the overall electrolysis performance and operational stability of the AEM electrolyzer.

[0012] Optionally, in the wave-shaped flow channel, the turbulence intensity perpendicular to the flow direction is achieved by adjusting the value of A in the frequency conversion sine function y(x)=A*sin([k0+(k1-k0)*(x / L)]*x+φ). The wave-shaped flow channel has a preset amplitude range to form a turbulence structure perpendicular to the flow direction.

[0013] By adopting the above technical solution and setting the preset amplitude range of the wave-shaped flow channel, a controllable turbulence structure is formed in the flow channel perpendicular to the flow direction, thereby enhancing the lateral mixing effect of the electrolyte during the flow process and promoting uniform contact of reactants on the electrode surface. At the same time, the turbulence intensity can be matched and adjusted according to the electrolysis conditions, which improves the mass transfer efficiency and bubble desorption capacity while avoiding the increase in pressure drop caused by excessive disturbance, which is conducive to achieving efficient and stable operation of the AEM electrolyzer.

[0014] Optionally, the density of the waveform in the front and rear flow directions in the wave-shaped flow channel can be achieved by adjusting the values ​​of k1 and k0 in the frequency conversion sine function y(x)=A*sin([k0+(k1-k0)*(x / L)]*x+φ).

[0015] By adopting the above technical solution, the density of the waveform before and after the variable frequency sinusoidal wave-shaped flow channel is controlled, so that the fluid forms a gradual flow resistance and disturbance distribution along the flow direction. This is beneficial to maintain a high fluid renewal capacity in the later stage of electrolyte flow, reduce gas accumulation and local concentration polarization in the later stage of reaction, and optimize the energy distribution of the flow field without significantly increasing the overall pressure drop, thereby improving the electrolysis efficiency and operational stability of the AEM electrolyzer.

[0016] Optionally, a straight inlet flow channel is connected between the wavy flow channel and the inlet, and a straight outlet flow channel is connected between the wavy flow channel and the outlet; the straight inlet flow channel is vertically connected to the inlet, and the straight outlet flow channel is vertically connected to the outlet.

[0017] By adopting the above technical solution, a vertically connected straight inlet channel is set between the inlet and the corrugated channel, which standardizes and stabilizes the direction of the electrolyte entering the flow field, and facilitates uniform liquid supply to each corrugated channel. At the same time, a straight outlet channel is set between the corrugated channel and the outlet, which allows the electrolyte and generated gas after the reaction to be smoothly collected and discharged, reducing flow interference and local stagnation, thereby improving the overall stability of the flow field and the operational reliability of the AEM electrolyzer.

[0018] Optionally, the inlet has an elongated shape, the outlet has an elongated shape, and both the inlet and outlet are oriented left and right; the plurality of wavy channels are evenly arranged in an array in the flow field, each wavy channel is perpendicular to the inlet and outlet, one end of each wavy channel is connected to the inlet, and the other end of each wavy channel is connected to the outlet.

[0019] By adopting the above technical solution, the inlet and outlet are set as long strip structures running left and right, and several wavy flow channels are evenly arranged in an array and vertically connected to the inlet and outlet. This can achieve uniform distribution and synchronous flow of electrolyte in the flow field, avoiding local flow deviation. At the same time, it is conducive to obtaining consistent flow conditions in each flow channel, reducing the phenomenon of single channel overload or underload, thereby improving the overall electrolysis consistency and operational stability of the AEM electrolyzer.

[0020] Optionally, the inlet and outlet are both elongated and oriented horizontally; the plurality of wavy channels are evenly arranged in an array in the flow field, and the wavy channels are all perpendicular to the inlet and outlet; correspondingly, the straight inlet channel is perpendicular to the inlet and the straight outlet channel is perpendicular to the outlet.

[0021] By adopting the above technical solution, the elongated inlet and outlet running left and right are organically combined with several vertically arranged wavy flow channels and corresponding straight inlet and outlet flow channels, so as to achieve uniform distribution and smooth flow of electrolyte in the flow field, ensure consistent flow in each flow channel, and reduce local flow deviation and stagnation. At the same time, optimizing the inlet and outlet flow directions helps to maintain a stable turbulence effect and gas-liquid separation efficiency, thereby improving the overall electrolysis efficiency and operational reliability of the AEM electrolyzer.

[0022] Optionally, the several wavy flow channels have the same shape and size.

[0023] By adopting the above technical solution, several wave-shaped flow channels are designed with the same shape and size, so that the fluid obtains consistent flow resistance and turbulence effect in each flow channel, ensuring uniform flow distribution in each channel and avoiding uneven reaction caused by excessively high or low local flow velocities. At the same time, it is beneficial to simplify manufacturing and assembly processes, improve the consistency and repeatability of the flow field structure, thereby improving the overall electrolysis efficiency, operational stability and long-term reliability of the AEM electrolyzer.

[0024] Optionally, the air inlet has an elongated shape.

[0025] Optionally, the cross-section of the wave-shaped flow channel is rectangular, trapezoidal, or rounded rectangular.

[0026] In summary, this application includes at least one of the following beneficial technical effects: The wavy flow channel alters the flow velocity through periodic changes in cross-sectional area. Based on Bernoulli's principle, it generates low pressure and high speed in narrow sections and high pressure and low speed in wide sections, creating a pressure difference that pushes bubbles away from the electrode surface. Simultaneously, the eddy current effect gathers bubbles to the center, optimizing mass transfer. Compared to parallel flow channels, which are prone to bubble accumulation due to uneven flow velocity, the wavy design can extend the flow path, evenly distribute the electrolyte, and reduce dead zones, ensuring continuous bubble discharge. Under the premise of ensuring effective bubble discharge and avoiding mass transfer limitations, the wavy flow channel can use the lowest possible flow velocity to achieve the best balance between energy consumption and performance.

[0027] Based on the working conditions of the front and rear sides of the flow channel, the waveform of the wave-shaped flow channel gradually becomes denser from front to back. Fewer and smaller bubbles are generated on the front side of the flow channel, so the wave structure on the front side of the flow channel is sparser, which can significantly reduce the processing difficulty and cost. At the same time, more and larger bubbles accumulate on the rear side of the flow channel, and the denser wave structure on the rear side of the flow channel can effectively remove the accumulated large bubbles. This design can reduce production costs on the one hand and ensure bubble removal efficiency on the other.

[0028] The sinusoidal wave structure of the flow channel distribution conforms to a specific formula, which greatly improves the uniformity of the electrode flow channel processing and makes the production consistency of the processed products higher; when the number and layout of the flow channels are adjusted, the flow channel lines are smoother. Attached Figure Description

[0029] Figure 1 This is an exploded view of the layout structure of the AEM electrolytic cell according to an embodiment of this application; Figure 2 This is a schematic diagram of the bipolar plate anode surface structure of the AEM electrolytic cell according to an embodiment of this application; Figure 3 This is a comparison diagram of the frequency conversion sinusoidal wave-shaped flow channel of this application, with the amplitude A value modified; Figure 4 This is a comparison diagram of the frequency conversion sinusoidal wave-shaped flow channel in the embodiment of this application, with modified values ​​of k1 and k0. It also shows the wave-shaped flow channel structure with sparse front and dense back.

[0030] Explanation of reference numerals in the attached diagram: 1. Pressure plate one; 2. Insulating plate one; 3. Cathode plate; 4. Anion membrane one; 5. Bipolar plate; 6. Anion membrane two; 7. Anode plate; 8. Insulating plate two; 9. Pressure plate two; 10. Seal; 11. Liquid inlet; 12. Liquid outlet; 13. Corrugated flow channel; 14. Air guide port; 15. Straight flow channel for liquid inlet; 16. Straight flow channel for liquid outlet. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0032] This application discloses a variable frequency sinusoidal wave flow field structure for an AEM electrolyzer. (Refer to...) Figures 1-4 An AEM electrolytic cell includes a pressure plate 1, an insulating plate 2, a cathode plate 3, an anion exchange membrane 4, a bipolar plate 5, an anion exchange membrane 6, an anode plate 7, an insulating plate 8, and a pressure plate 9 connected in sequence. Seals 10 are provided between adjacent components.

[0033] It should be emphasized that the anode surface of the bipolar plate 5 and the surface of the anode plate 7 are provided with a variable frequency sinusoidal wave flow field. The front part of the flow field is provided with a liquid inlet 11 and the rear part of the flow field is provided with a liquid outlet 12. The liquid inlet 11 and the liquid outlet 12 are both oriented left and right. Several variable frequency sinusoidal wave flow channels 13 are provided between the liquid inlet 11 and the liquid outlet 12. The several variable frequency sinusoidal wave flow channels 13 are all oriented front and back. Air guide ports 14 are provided on both the left and right sides of the flow field. The air guide ports 14 on both sides are located on the left and right sides of the several variable frequency sinusoidal wave flow channels 13.

[0034] The inlet 11 is elongated, the outlet 12 is elongated, and the air guide 14 is elongated. All the corrugated channels 13 have the same shape and size, and are evenly arranged in an array in the flow field. A straight inlet channel 15 is connected between the corrugated channel 13 and the inlet 11, and a straight outlet channel 16 is connected between the corrugated channel 13 and the outlet 12. The straight inlet channel 15 is vertically connected to the inlet 11, and the straight outlet channel 16 is vertically connected to the outlet 12.

[0035] In the structure of all the corrugated flow channels 13, the waveform gradually becomes denser from front to back. The technical solution has two advantages: First, considering the working conditions of the front and rear sides of the flow channel, the waveform of the corrugated flow channel 13 gradually becomes denser from front to back; fewer and smaller bubbles are generated on the front side of the flow channel, so the corrugated flow channel 13 has a sparser wave structure on the front side, which can significantly reduce the processing difficulty and cost; Second, more and larger bubbles accumulate on the rear side of the flow channel, and the denser rear wave structure can effectively remove the accumulated large bubbles.

[0036] To ensure uniformity in the processing of the electrode flow channel and consistency in the production of processed products, the shape of the wavy flow channel 13 conforms to the frequency conversion sine function y(x)=A*sin([k0+(k1-k0)*(x / L)]*x+φ); where A refers to the amplitude coefficient, k0 refers to the starting wavelength, k1 refers to the ending wavelength, x refers to the current position, L refers to the theoretical length, and φ refers to the phase. In the wavy flow channel 13, the intensity of the turbulence perpendicular to the flow direction is achieved by adjusting the value of A in the frequency-controlled sine function y(x)=A*sin([k0+(k1-k0)*(x / L)]*x+φ). The larger the value of A, the greater the intensity of the turbulence perpendicular to the flow direction in the wavy flow channel, that is, the greater the wave undulation. In the wavy flow channel 13, the density of the waveform in the front and rear flow directions is achieved by adjusting the values ​​of k1 and k0 in the frequency-controlled sine function y(x)=A*sin([k0+(k1-k0)*(x / L)]*x+φ). The greater the difference between the values ​​of k1 and k0, the greater the difference in the density of the curves at the front and rear, corresponding to a denser flow field at the rear.

[0037] refer to Figure 3 In the upper half, the variable frequency sine function upon which this flow channel is based has A value of 2, k1 value of 5, and k0 value of 5.

[0038] refer to Figure 3 In the lower half, in the variable frequency sine function on which the flow channel shape is based, the value of A is 1.5, the value of k1 is 5, and the value of k0 is 5.

[0039] refer to Figure 4 In the upper half, the variable frequency sine function upon which this flow channel is based has A value of 2, k1 value of 10, and k0 value of 5.

[0040] refer to Figure 4 In the lower half, in the variable frequency sine function upon which this flow channel is based, the value of A is 2, the value of k1 is 10, and the value of k0 is 4.

[0041] During operation, the reactant water is introduced from the inlet, flows along the corrugated channel 13 to the outlet, and is finally discharged from the outlet. In this technical solution, the AEM electrolyzer has a conventional configuration, and the technical innovation lies in the design of the corrugated channel 13.

[0042] Example 1: Standard Variable Frequency Sine Wave Flow Channel Arrangement See attached document Figure 1-4Example 1 discloses a standard variable frequency sinusoidal wave flow field arrangement for an AEM electrolytic cell, comprising a pressure plate, an insulating plate 2, a cathode plate 3, an anion exchange membrane 4, a bipolar plate 5, an anode plate 7, and sealing components. A variable frequency sinusoidal wave flow field is provided on the anode surface of the bipolar plate 5 and the surface of the anode plate 7. An inlet is located at the front of the flow field, and an outlet is located at the rear. Both the inlet and outlet are oriented left-right. Several wave-shaped channels are arranged in the center of the flow field. The wave-shaped channels are connected to the inlet via straight inlet channels and to the outlet via straight outlet channels. Both the inlet and outlet channels are perpendicular to the inlet and outlet. Air guides are provided on the left and right sides of the flow field. The waveform of the wave-shaped channels gradually decreases from front to back. The parameters of the wave-shaped flow channel are: the waveform conforms to the frequency conversion sine function: y(x)=Asin([k0+(k1-k0)(x / L)]*x+φ); Amplitude A = 2 mm, wavelength k0 = 20 mm, k1 = 10 mm, L = 150 mm, φ = 0°; Several wavy flow channels have rectangular cross-sections, are of uniform size, and are arranged in a uniform array. Technical effects of Example 1: By designing the waveform to be progressively denser from front to back, the front section of the flow channel has a sparse waveform, reducing processing difficulty; the rear section has a dense waveform, which is conducive to the rapid removal of accumulated bubbles. The wavy flow channel forms a vertical turbulence structure, improving the lateral mixing effect of the electrolyte, achieving uniform flow, reducing local stagnation, and improving mass transfer efficiency and electrolytic reaction stability.

[0043] Example 2 This embodiment is an example of optimizing the parameters of a variable frequency sinusoidal wave flow channel. Technical solution This embodiment, based on Embodiment 1, further optimizes flow disturbance and bubble discharge efficiency by adjusting the amplitude and wavelength of the corrugated flow channel. The flow field structure is consistent with Embodiment 1, including a liquid inlet, a liquid outlet, a gas guide, a corrugated flow channel, a straight liquid inlet flow channel, and a straight liquid outlet flow channel; The parameters of the wave-shaped flow channel are: the waveform conforms to the frequency conversion sine function: y(x)=Asin([k0+(k1-k0)(x / L)]*x+φ); Amplitude A = 3 mm (10–20% increase compared to Example 1), wavelength k0 = 25 mm, k1 = 12 mm, L = 150 mm; Several wavy flow channels have rounded rectangular cross-sections, are the same size, and are arranged in a uniform array. The technical effect of Example 2 is that by increasing the amplitude, the vertical turbulence intensity is enhanced, which improves the efficiency of lateral mixing of electrolyte and desorption of bubbles; the wavelength is gradually reduced at the front and back to achieve a design that is sparse at the front and dense at the back, so that the gas and liquid enter the flow field uniformly in the front section and the accumulated bubbles are efficiently discharged in the back section, which further improves the overall flow uniformity and electrolysis efficiency of the electrolytic cell, while maintaining low pressure drop and consistent structural processing.

[0044] The implementation principle of a variable frequency sinusoidal wave flow field structure for an AEM electrolyzer according to an embodiment of this application is as follows: This structure, by setting several wave-shaped flow channels on the anode surface or the anode plate surface of the bipolar plate in the electrolyzer, allows the electrolyte to flow along the variable frequency sinusoidal waveform channels, thereby forming a continuous turbulence structure during fluid flow. The waveform of the wave-shaped flow channels gradually densifies from front to back, achieving moderate flow velocity, low bubble generation, and low processing difficulty in the front section, while the denser waveform in the rear section facilitates faster bubble discharge and sufficient contact of reactants with the electrode surface. The shape of the wave-shaped flow channel can be controlled by the frequency-varying sinusoidal function y(x)=A⋅sin([k0+(k1−k0)⋅(x / L)]⋅x+ϕ), where A is the amplitude coefficient used to adjust the turbulence intensity perpendicular to the flow direction, k0 and k1 are the starting wavelength and ending wavelength, respectively, used to control the change in the density of the waveform before and after, L is the theoretical length, and φ is the phase. Furthermore, the corrugated flow channel is connected to the inlet and outlet via straight flow channels, ensuring that the fluid is rectified before entering the corrugated flow channel and discharged smoothly from the outlet. The cross-section of the corrugated flow channel can be rectangular, trapezoidal, or rounded rectangle to optimize fluid flow characteristics and processing consistency. Through the above structural design, enhanced turbulence in the vertical and flow directions is achieved, improving the uniform distribution of electrolyte, gas-liquid separation efficiency, and overall mass transfer efficiency, thereby improving the electrolysis performance and operational stability of the AEM electrolyzer.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A variable frequency sinusoidal wave flow field structure for an AEM electrolyzer, characterized in that: The flow field includes a liquid inlet at the front and a liquid outlet at the rear. Air guides are provided on the left and right sides of the flow field. Several wavy channels are provided in the center of the flow field, with the liquid inlet and liquid outlet connected to the two ends of the wavy channels respectively. The waveform of the wavy channels gradually becomes denser from front to back.

2. The variable frequency sinusoidal wave flow field for an AEM electrolytic cell according to claim 1, characterized in that: The shape of the wave-shaped flow channel conforms to the frequency-converting sine function y(x)=A*sin([k0+(k1-k0)*(x / L)]*x+φ); the wave-shaped flow channel is a frequency-converting sine waveform structure, and its wavelength gradually decreases along the flow direction. Where A refers to the amplitude coefficient, k0 refers to the starting wavelength, k1 refers to the ending wavelength, x refers to the current position, L refers to the theoretical length, and φ refers to the phase.

3. The variable frequency sinusoidal wave flow field for an AEM electrolytic cell according to claim 2, characterized in that: In the wave-shaped flow channel, the turbulence intensity perpendicular to the flow direction is achieved by adjusting the value of A in the frequency-converted sinusoidal function y(x)=A*sin([k0+(k1-k0)*(x / L)]*x+φ). The wave-shaped flow channel has a preset amplitude range to form a turbulence structure perpendicular to the flow direction.

4. The variable frequency sinusoidal wave flow field for an AEM electrolytic cell according to claim 2, characterized in that: In the wave-shaped flow channel, the density of the waveform in the forward and backward flow directions is achieved by adjusting the values ​​of k1 and k0 in the frequency conversion sine function y(x)=A*sin([k0+(k1-k0)*(x / L)]*x+φ).

5. The variable frequency sinusoidal wave flow field for an AEM electrolytic cell according to claim 1, characterized in that: A straight inlet channel is connected between the wavy flow channel and the inlet, and a straight outlet channel is connected between the wavy flow channel and the outlet; the straight inlet channel is vertically connected to the inlet, and the straight outlet channel is vertically connected to the outlet.

6. The variable frequency sinusoidal wave flow field for an AEM electrolytic cell according to claim 1, characterized in that: The inlet and outlet are both elongated and oriented horizontally. A plurality of wavy channels are evenly arranged in an array in the flow field. Each wavy channel is perpendicular to the inlet and outlet. One end of each wavy channel is connected to the inlet, and the other end of each wavy channel is connected to the outlet.

7. The variable frequency sinusoidal wave flow field for an AEM electrolytic cell according to claim 5, characterized in that: The inlet and outlet are both elongated and oriented horizontally. The several wavy channels are evenly arranged in an array in the flow field, and each wavy channel is perpendicular to the inlet and outlet. Correspondingly, the straight inlet channel is perpendicular to the inlet, and the straight outlet channel is perpendicular to the outlet.

8. The variable frequency sinusoidal wave flow field for an AEM electrolytic cell according to claim 1, characterized in that: The several wavy flow channels have the same shape and size.

9. A variable frequency sinusoidal wave flow field for an AEM electrolytic cell according to claim 1, characterized in that: The air inlet has an elongated structure.

10. A variable frequency sinusoidal wave flow field structure for an AEM electrolyzer according to any one of claims 1 to 9, characterized in that: The cross-section of the wave-shaped flow channel is rectangular, trapezoidal, or rounded rectangular.

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