Electrocatalytic polar plate and design method thereof

Abstract

The invention provides an electro-catalysis polar plate and a design method thereof, and relates to the technical field of electro-catalysis, the electro-catalysis polar plate is suitable for CO2 electro-catalysis equipment, water electrolysis equipment or a fuel cell, the electro-catalysis polar plate comprises a polar plate, the polar plate is provided with a plurality of reaction medium header pipe inlets, a plurality of reaction medium header pipe outlets and catalytic reaction zone flow channels, an inlet and an outlet of each reaction medium header pipe are respectively communicated with the catalytic reaction zone flow channel through at least one branch flow channel; wherein the inlets and outlets of all the reaction medium main pipes and all the branch flow channels are subjected to insulation treatment so as to reduce bypass current. The inlet and the outlet of each reaction medium header pipe and each branch flow channel are subjected to insulation treatment to reduce bypass current, a microporous structure or a diaphragm is not arranged, side reaction cannot be generated, the problem that part of current is lost in a side reaction environment in microporous structure or diaphragm separation is solved, and the separation efficiency is improved. And each branch flow channel is subjected to insulation treatment, so that the current can flow on a target reaction path, an auxiliary structure is not needed, and the electro-catalysis efficiency is effectively improved.

Description

Technical Field

[0001] The invention relates to the field of electrocatalytic technology, and in particular to an electrocatalytic electrode plate and a design method thereof. Background Art

[0002] Bipolar plates can use electrocatalytic reactions to convert carbon dioxide into useful chemicals or fuels. In the electrocatalytic process of carbon dioxide CO2, bypass current is a common source of energy loss, which means that part of the current flows through non-target reaction paths and does not participate in the CO2 reduction reaction, resulting in reduced energy efficiency and selectivity. The existence of bypass current not only consumes the current used to reduce CO2, but also triggers side reactions such as hydrogen evolution or water decomposition, thereby affecting the efficiency of the electrocatalytic reaction.

[0003] Most existing bipolar plates use microporous structures, membrane separation structures or highly selective catalysts to reduce bypass current. However, microporous structures or membrane separation structures have the problem of partial current loss in the side reaction environment. Highly selective catalysts cannot completely prevent current from passing through non-reaction paths, and optimization of auxiliary structure design is still required. Summary of the invention

[0004] The present invention provides an electrocatalytic plate and a design method thereof, which can reduce the flow of current on non-target reaction paths and effectively improve the electrocatalytic efficiency.

[0005] The present invention provides an electrocatalytic plate, which is suitable for CO2 electrocatalytic equipment, water electrolysis equipment or fuel cell, and the electrocatalytic plate comprises a plate, on which are arranged a plurality of reaction medium main pipe inlets, a plurality of reaction medium main pipe outlets and a catalytic reaction zone flow channel, each of the reaction medium main pipe inlets and each of the reaction medium main pipe outlets are respectively connected to the catalytic reaction zone flow channel through at least one branch flow channel; Among them, each reaction medium main pipe inlet, each reaction medium main pipe outlet and each branch flow channel are insulated to reduce bypass current.

[0006] According to an electrocatalytic plate provided by the present invention, the length of each branch flow channel is determined based on the bypass current and the current corrosion intensity, and the area of ​​each reaction medium main pipe inlet and the area of ​​each reaction medium main pipe outlet are determined based on the bypass current and the battery performance; Among them, the length of each branch flow channel is negatively correlated with the bypass current and the current corrosion intensity, and the area of ​​each reaction medium main pipe inlet and the area of ​​each reaction medium main pipe outlet are negatively correlated with the bypass current and positively correlated with the battery performance.

[0007] According to an electrocatalytic plate provided by the present invention, the length of any branch flow channel satisfies the following expression: ; in, L represents the length of any branch flow channel, represents the internal resistance of the catalytic reaction zone, Indicates the current corrosion intensity, represents the material conductivity of the flow channel in the catalytic reaction zone, represents the cross-sectional area of ​​any branch flow channel.

[0008] According to an electrocatalytic plate provided by the present invention, the area of ​​each of the reaction medium main pipe inlet and the area of ​​each of the reaction medium main pipe outlet satisfy the following expression: ≤5%; in, represents the area of ​​any of the reaction medium main pipe inlet or the area of ​​any of the reaction medium main pipe outlet, Represents the area of ​​the flow channel in the catalytic reaction zone.

[0009] According to an electrocatalytic plate provided by the present invention, each of the reaction medium main pipe inlet, each of the reaction medium main pipe outlets and each of the branch flow channels are insulated, including: The inlet of each reaction medium main pipe, the outlet of each reaction medium main pipe and each branch flow channel are insulated respectively by means of insulating coating, insulating gasket or injection molding.

[0010] According to an electrocatalytic plate provided by the present invention, the area of ​​any inlet of the reaction medium main pipe is the same as the area of ​​its corresponding outlet of the reaction medium main pipe.

[0011] According to an electrocatalytic electrode plate provided by the present invention, any one of the reaction medium main pipe inlets and its corresponding reaction medium main pipe outlet are rotationally symmetrically arranged.

[0012] According to an electrocatalytic plate provided by the present invention, two sides of the plate are respectively a cathode field and an anode field.

[0013] According to an electrocatalytic plate provided by the present invention, the plate is made of stainless steel, titanium, graphite or aluminum alloy.

[0014] The present invention also provides a method for designing an electrocatalytic plate, which is used to determine any one of the electrocatalytic plates, and the method comprises: Determine the parameters of the reaction medium main pipe inlet, the reaction medium main pipe outlet and the catalytic reaction zone flow channel provided on the electrode plate according to the applicable scenario; the applicable scenario includes one of a CO2 electrocatalytic device, a water electrolysis device and a fuel cell; Each of the reaction medium main pipe inlets, each of the reaction medium main pipe outlets and each of the branch flow channels are insulated to reduce bypass current.

[0015] The electrocatalytic plate and its design method provided by the present invention are suitable for CO2 electrocatalytic equipment, water electrolysis equipment or fuel cell, including a plate, on which a plurality of reaction medium main pipe inlets, a plurality of reaction medium main pipe outlets and a catalytic reaction zone flow channel are provided, each of the reaction medium main pipe inlets and each of the reaction medium main pipe outlets are respectively connected to the catalytic reaction zone flow channel through at least one branch flow channel; wherein each of the reaction medium main pipe inlets, each of the reaction medium main pipe outlets and each of the branch flow channels are insulated to reduce the bypass current. The present invention insulates each of the reaction medium main pipe inlets, each of the reaction medium main pipe outlets and each of the branch flow channels to reduce the bypass current, does not set a microporous structure or a diaphragm, and does not produce a side reaction, thereby solving the problem of partial current loss in the side reaction environment when the microporous structure or the diaphragm is separated. The present invention insulates each of the branch flow channels to ensure that the current flows on the target reaction path, does not require an auxiliary structure, and effectively improves the electrocatalytic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the electrocatalytic plate provided by the present invention.

[0018] Figure 2 It is a schematic diagram of the effect of the inlet and outlet areas of the reaction medium main pipe provided by the present invention on the bypass current.

[0019] Figure 3 This is one of the schematic diagrams showing the effect of the insulation treatment provided by the present invention on the bypass current.

[0020] Figure 4 This is the second schematic diagram of the effect of the insulation treatment provided by the present invention on the bypass current.

[0021] Figure 5 It is a schematic diagram of deriving the formula of the branch flow channel provided by the present invention.

[0022] Figure 6 It is a schematic flow chart of the electrocatalytic plate design method provided by the present invention.

[0023] In the figure, 1-polar plate, 11-first reaction medium main pipe inlet, 111-branch flow channel, 12-first reaction medium main pipe outlet, 13-second reaction medium main pipe inlet, 14-second reaction medium main pipe outlet, 15-catalytic reaction zone flow channel. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Figure 1 Schematic diagram of the structure of an embodiment of the electrocatalytic plate provided by the present invention. Figure 1 As shown, the present invention provides an electrocatalytic plate, which is suitable for CO2 electrocatalytic equipment, water electrolysis equipment or fuel cell. The electrocatalytic plate includes a plate, on which are provided a plurality of reaction medium main pipe inlets, a plurality of reaction medium main pipe outlets and a catalytic reaction zone flow channel, each of the reaction medium main pipe inlets and each of the reaction medium main pipe outlets are connected to the catalytic reaction zone flow channel via at least one branch flow channel.

[0026] Among them, each reaction medium main pipe inlet, each reaction medium main pipe outlet and each branch flow channel are insulated to reduce bypass current.

[0027] CO2 electrocatalytic equipment is an electrochemical device used to convert carbon dioxide (CO2) into useful chemicals, fuels or other renewable energy sources, which can reduce greenhouse gas emissions and effectively utilize CO2. CO2 electrocatalysis can be converted into a variety of target products, such as methanol, ethylene, methane, etc. The reactants of CO2 electrocatalytic equipment are carbonate ion-containing raw materials such as KOH and KHCO3, and the products do not contain harmful gases.

[0028] Water electrolysis equipment is a device that uses electrochemical principles to decompose water (H2O) into hydrogen (H2) and oxygen (O2). It usually uses an electrolyte solution with high conductivity to improve the reaction efficiency. Water electrolysis equipment is often used in hydrogen production, energy storage and clean energy development.

[0029] A fuel cell is a device that converts chemical energy directly into electrical energy, using the electrochemical reaction between hydrogen and oxygen (usually from the air) to generate electricity, water and heat without involving a combustion process. It has the advantages of high efficiency, low emissions and the potential for renewable energy.

[0030] According to the target device (a device among CO2 electrocatalytic device, water electrolysis device and fuel cell) used by the electrocatalytic plate and the corresponding working principle of the target device, the number of the reaction medium main pipe inlet and the reaction medium main pipe outlet can be determined. In the embodiment of the present invention, the number of the reaction medium main pipe inlet and the reaction medium main pipe outlet is 2, that is, the plate 1 is provided with a first reaction medium main pipe inlet 11, a second reaction medium main pipe inlet 13, a first reaction medium main pipe outlet 12 and a second reaction medium main pipe outlet 14, and the first reaction medium main pipe inlet 11 is connected with the catalytic reaction zone flow channel 15 through a branch flow channel 111. The first reaction medium corresponding to the target device enters the catalytic reaction zone flow channel 15 through the first reaction medium main pipe inlet 11, and the second reaction medium enters the catalytic reaction zone flow channel 15 through the second reaction medium main pipe inlet 13. The first reaction medium and the second reaction medium perform catalytic reaction in the catalytic reaction zone flow channel 15. After the reaction is completed, the first reaction medium flows out through the first reaction medium main pipe outlet 12, and the second reaction medium flows out through the second reaction medium main pipe outlet 14.

[0031] Optionally, the electrode plate is made of stainless steel, titanium, graphite or aluminum alloy.

[0032] It can be understood that the present invention can reduce the bypass current without external input through a specific structural design. Specifically, the present invention insulates the inlet of each reaction medium main pipe, the outlet of each reaction medium main pipe and each branch flow channel to reduce the bypass current. No microporous structure or diaphragm is provided, and no side reaction occurs, thereby solving the problem of partial current loss in the side reaction environment caused by microporous structure or diaphragm separation. In addition, the insulation treatment of each branch flow channel can ensure that the current flows on the target reaction path, and no auxiliary structure is required, thereby effectively improving the electrocatalytic efficiency.

[0033] Based on the above embodiment, as an optional embodiment, the length of each branch flow channel is determined based on the bypass current and the current corrosion intensity, and the area of ​​each reaction medium main pipe inlet and the area of ​​each reaction medium main pipe outlet are determined based on the bypass current and the battery performance.

[0034] The length of each branch flow channel is negatively correlated with the bypass current and the current corrosion intensity, and the area of ​​each reaction medium main pipe inlet and the area of ​​each reaction medium main pipe outlet are negatively correlated with the bypass current and positively correlated with the battery performance.

[0035] The relationship between the branch flow channel, the inlet and outlet of the reaction medium main pipe and the bypass current is explained below in conjunction with a simulation example. Assume that the number of plates contained in a single stack is 60, the equilibrium potential of the reaction unit is 1.23V, the unit overpotential is 0.8V, the internal resistance of the catalytic reaction zone (if the present invention is applicable to a fuel cell, the internal resistance of the catalytic reaction zone is the internal resistance of the battery) is 0.0002Ω, the input current is 100A, and the area of ​​the catalytic reaction zone is 100cm 2 , the parameter settings of the four simulation examples are as follows: Simulation Example 1: The branch flow channel and the inlet and outlet of the reaction medium main pipe are not insulated, and the cross-sectional area of ​​the inlet and outlet of the reaction medium main pipe is 5 cm 2 , the resistance of the branch flow channel is 84Ω, and the resistance of the inlet and outlet of the reaction medium main pipe is 0.2Ω; Simulation Example 2: The branch flow channel and the inlet and outlet of the reaction medium main pipe are not insulated, and the cross-sectional area of ​​the inlet and outlet of the reaction medium main pipe is 10 cm 2 , the resistance of the branch flow channel is 84Ω, and the resistance of the inlet and outlet of the reaction medium main pipe is 0.1Ω; Simulation Example 3: The branch flow channel is insulated, and the inlet and outlet of the reaction medium main pipe are not insulated. The cross-sectional area of ​​the inlet and outlet of the reaction medium main pipe is 5 cm 2 , the branch flow channel resistance is 5000Ω, and the total pipe resistance is 0.2Ω; Simulation Example 4: The branch flow channel and the inlet and outlet of the reaction medium main pipe are insulated. The cross-sectional area of ​​the inlet and outlet of the reaction medium main pipe is 5 cm2 respectively, the resistance of the branch flow channel is 5000Ω, and the resistance of the main pipe is 50Ω.

[0036] Figure 2 The horizontal axis represents the number of the electrode plates, and the vertical axis represents the bypass current. The maximum current loss of Simulation Example 2 reaches 15.93 / 100=15.93%, and the maximum current loss of Simulation Example 1 reaches 12.10 / 100=12.10%. It can be seen that as the inlet and outlet areas of the reaction medium main pipe increase, the loss of bypass current increases.

[0037] Figure 3 The horizontal axis represents the plate number, and the vertical axis represents the bypass current. The maximum current loss of simulation example 1 reaches 12.10 / 100=12.10%, the maximum current loss of simulation example 3 reaches 0.38 / 100=0.38%, and the maximum current loss of simulation example 4 reaches 0.078 / 100=0.078%. It can be seen that the insulation design can greatly reduce the loss of bypass current.

[0038] Figure 4The horizontal axis represents the number of the electrode plate, and the vertical axis represents the bypass current of the branch flow channel. The maximum channel current (current corrosion) of Simulation Example 1 is 0.920A, the maximum channel current (current corrosion) of Simulation Example 3 is 0.025A, and the maximum channel current (current corrosion) of Simulation Example 4 is 0.0082A. It can be seen that the insulation design can greatly reduce the loss of bypass current in the branch flow channel.

[0039] Through the above four simulation examples, it can be seen that the length of each branch flow channel is negatively correlated with the bypass current and the current corrosion intensity, and the area of ​​each reaction medium main pipe inlet and the area of ​​each reaction medium main pipe outlet are negatively correlated with the bypass current and positively correlated with the battery performance.

[0040] The present invention has a certain effect on the length of the branch flow channel. L The limiting principle is that the current corrosion intensity does not exceed 5%. The current corrosion intensity threshold is an empirical value obtained based on actual tests. The smaller the inlet and outlet areas of the reaction medium main pipe, the greater the resistance, and thus the smaller the bypass current. However, the inlet and outlet areas of the reaction medium main pipe are related to the area of ​​the catalytic reaction zone. If the areas are too small, the battery performance will be reduced.

[0041] As an optional embodiment, the present invention limits the length of the branch flow channel, and limits the length of any branch flow channel to satisfy the following expression: ; in, L represents the length of any branch flow channel, represents the internal resistance of the catalytic reaction zone, Indicates the current corrosion intensity, represents the material conductivity of the flow channel in the catalytic reaction zone, represents the cross-sectional area of ​​any branch flow channel.

[0042] The derivation process of the above formula is as follows Figure 5 As shown, the voltage of the branch flow channel corresponding to the inlet of the first reaction medium main pipe is The voltage of the catalytic reaction zone flow channel same, , current corrosion intensity , and know, , thus it can be deduced that .

[0043] As an optional embodiment, the present invention limits the area of ​​the inlet and outlet of the reaction medium main pipe, and limits the area of ​​each reaction medium main pipe inlet and the area of ​​each reaction medium main pipe outlet to satisfy the following expression: ≤5%; in, represents the area of ​​any of the reaction medium main pipe inlet or the area of ​​any of the reaction medium main pipe outlet, Represents the area of ​​the flow channel in the catalytic reaction zone.

[0044] It can be understood that the present invention limits the areas of the inlet and outlet of the reaction medium main pipe and the length of the branch flow channel respectively, which can ensure the performance of the electrode plate while reducing the bypass current.

[0045] Based on the above embodiment, as an optional embodiment, each of the reaction medium main pipe inlets, each of the reaction medium main pipe outlets and each of the branch flow channels are insulated, including: The inlet of each reaction medium main pipe, the outlet of each reaction medium main pipe and each branch flow channel are insulated respectively by means of insulating coating, insulating gasket or injection molding.

[0046] The insulating treatment of each of the reaction medium main pipe inlet, each of the reaction medium main pipe outlets and each of the branch flow channels by insulating coating specifically includes the following steps: Use appropriate cleaning agents and tools to remove dirt, grease and oxides on the surface of the plate to ensure the adhesion of the coating. Before coating, ensure that the plate is completely dry to prevent moisture from affecting the quality of the coating. Select a suitable insulating coating according to the application requirements, such as a polymer-based coating, a fluoride coating or other special insulating materials. According to the properties of the coating and the application requirements, select spraying, dipping or manual brushing and other methods for coating to ensure that the coating is uniform and avoid bubbles and scratches. According to the requirements of the coating, perform appropriate curing treatment, which may involve heating or natural curing under specific conditions. Use a coating thickness gauge to measure the coating thickness to ensure that it meets the standards, and then perform an electrical insulation test to verify whether the coating has achieved the required insulation performance.

[0047] The steps of insulating each reaction medium main pipe inlet, each reaction medium main pipe outlet and each branch flow channel by means of insulating gaskets or injection molding are similar to the insulating coating and will not be repeated herein.

[0048] It is understandable that the present invention insulates each of the reaction medium main pipe inlet, each of the reaction medium main pipe outlets and each of the branch flow channels through an insulating coating, an insulating gasket or injection molding. The insulating coating can not only reduce the bypass current, but also improve the corrosion resistance, high temperature resistance and low temperature resistance of the electrocatalytic plate. Compared with the insulating block, it can greatly reduce the volume and weight of the electrocatalytic plate, has strong adhesion, and can be compatible with a variety of materials. The insulating gasket can not only reduce the bypass current, but also prevent the leakage of the reaction medium of the electrocatalytic plate, and has high temperature resistance and corrosion resistance. Injection molding can reduce the bypass current. The injection molding process is suitable for large-scale production, which can effectively reduce the production cost of each product. It is suitable for electrocatalytic plates with complex circuit structures and has higher precision.

[0049] Based on the above embodiment, as an optional embodiment, the area of ​​any reaction medium main pipe inlet is the same as the area of ​​its corresponding reaction medium main pipe outlet.

[0050] It is understandable that the present invention sets the area of ​​any of the reaction medium main pipe inlet and the area of ​​the corresponding reaction medium main pipe outlet to the same parameter, and the flow rate and flow rate of the reaction medium through the reaction medium main pipe inlet and the reaction medium main pipe outlet can be the same, which helps to design a uniform flow field to avoid local overflow or lack of flow. In addition, the design of the reaction medium main pipe inlet and outlet has a direct impact on the pressure loss of the reaction medium. The same area can keep the same pressure loss characteristics for different configurations or paths, which helps to optimize the design of the electrocatalytic plate.

[0051] Based on the above embodiment, as an optional embodiment, any one of the reaction medium main pipe inlets and its corresponding reaction medium main pipe outlet are rotationally symmetrically arranged.

[0052] It can be understood that the present invention sets any of the reaction medium main pipe inlets and its corresponding reaction medium main pipe outlet in a rotationally symmetrical shape, which can reduce the dead zone of the reaction medium, achieve a more uniform flow state of the reaction medium, and improve the kinetic efficiency of the reaction medium.

[0053] Based on the above embodiment, as an optional embodiment, the two sides of the electrode plate are the cathode field and the anode field respectively. In the electrocatalytic electrode plate, the cathode field and the anode field are the key to achieving efficient electrochemical reactions. The electric field distribution of the cathode and the anode affects the effective contact and distribution of the reactants on the electrocatalytic electrode plate, thereby affecting the reaction rate and efficiency.

[0054] The electrocatalytic plate design method provided by the present invention is described below. The electrocatalytic plate design method described below and the electrocatalytic plate described above can be referred to each other.

[0055] Figure 6 is a schematic flow chart of the electrocatalytic plate design method provided by the present invention, such as Figure 6 As shown, the present invention also provides an electrocatalytic plate design method for determining any one of the electrocatalytic plates, and the method comprises steps S100 to S200.

[0056] Step S100, according to the applicable scenario, determine the parameters of the reaction medium main pipe inlet, the reaction medium main pipe outlet and the catalytic reaction zone flow channel arranged on the electrode plate; the applicable scenario includes one of a CO2 electrocatalytic device, a water electrolysis device and a fuel cell.

[0057] In step S200, each of the reaction medium main pipe inlets, each of the reaction medium main pipe outlets, and each of the branch flow channels are insulated to reduce bypass current.

[0058] As an optional embodiment, the length of each branch flow channel is determined based on the bypass current and the current corrosion intensity, and the area of ​​each reaction medium main pipe inlet and the area of ​​each reaction medium main pipe outlet are determined based on the bypass current and the battery performance.

[0059] Among them, the length of each branch flow channel is negatively correlated with the bypass current and the current corrosion intensity, and the area of ​​each reaction medium main pipe inlet and the area of ​​each reaction medium main pipe outlet are negatively correlated with the bypass current and positively correlated with the battery performance.

[0060] As an optional embodiment, the length of any branch flow channel satisfies the following expression: ; in, L represents the length of any branch flow channel, represents the internal resistance of the catalytic reaction zone, Indicates the current corrosion intensity, represents the material conductivity of the flow channel in the catalytic reaction zone, represents the cross-sectional area of ​​any branch flow channel.

[0061] As an optional embodiment, the area of ​​each reaction medium main pipe inlet and the area of ​​each reaction medium main pipe outlet satisfy the following expression: ≤5%; in, represents the area of ​​any of the reaction medium main pipe inlet or the area of ​​any of the reaction medium main pipe outlet, Represents the area of ​​the flow channel in the catalytic reaction zone.

[0062] As an optional embodiment, each of the reaction medium main pipe inlets, each of the reaction medium main pipe outlets, and each of the branch flow channels are insulated, including: The inlet of each reaction medium main pipe, the outlet of each reaction medium main pipe and each branch flow channel are insulated respectively by means of insulating coating, insulating gasket or injection molding.

[0063] The insulating treatment of each of the reaction medium main pipe inlet, each of the reaction medium main pipe outlets and each of the branch flow channels by insulating coating specifically includes the following steps: Use appropriate cleaning agents and tools to remove dirt, grease and oxides on the surface of the plate to ensure the adhesion of the coating. Before coating, ensure that the plate is completely dry to prevent moisture from affecting the quality of the coating. Select a suitable insulating coating according to the application requirements, such as a polymer-based coating, a fluoride coating or other special insulating materials. According to the properties of the coating and the application requirements, select spraying, dipping or manual brushing and other methods for coating to ensure that the coating is uniform and avoid bubbles and scratches. According to the requirements of the coating, perform appropriate curing treatment, which may involve heating or natural curing under specific conditions. Use a coating thickness gauge to measure the coating thickness to ensure that it meets the standards, and then perform an electrical insulation test to verify whether the coating has achieved the required insulation performance.

[0064] The steps of insulating each reaction medium main pipe inlet, each reaction medium main pipe outlet and each branch flow channel by means of insulating gaskets or injection molding are similar to the insulating coating and will not be repeated herein.

[0065] As an optional embodiment, the area of ​​any reaction medium main pipe inlet is the same as the area of ​​its corresponding reaction medium main pipe outlet.

[0066] As an optional embodiment, any one of the reaction medium main pipe inlets and its corresponding reaction medium main pipe outlet are rotationally symmetrically arranged.

[0067] As an optional embodiment, the two sides of the electrode plate are respectively a cathode field and an anode field.

[0068] As an optional embodiment, the electrode plate is made of stainless steel, titanium, graphite or aluminum alloy.

[0069] It should be noted that the electrocatalytic plate design method provided by the present invention is used to design the electrocatalytic plate described in any of the above embodiments, and has the technical effect corresponding to the electrocatalytic plate, which will not be described in detail in this embodiment.

[0070] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0071] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0072] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0073] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electrocatalytic plate, characterized in that: Applicable to CO2 electrocatalytic equipment, water electrolysis equipment or fuel cell, the electrocatalytic plate comprises a plate, on which are arranged a plurality of reaction medium main pipe inlets, a plurality of reaction medium main pipe outlets and a catalytic reaction zone flow channel, each of the reaction medium main pipe inlets and each of the reaction medium main pipe outlets are respectively connected to the catalytic reaction zone flow channel via at least one branch flow channel; Among them, each reaction medium main pipe inlet, each reaction medium main pipe outlet and each branch flow channel are insulated to reduce bypass current.

2. The electrocatalytic plate according to claim 1, characterized in that: The length of each branch flow channel is determined based on the bypass current and the current corrosion intensity, and the area of ​​each reaction medium main pipe inlet and the area of ​​each reaction medium main pipe outlet are determined based on the bypass current and the battery performance; Among them, the length of each branch flow channel is negatively correlated with the bypass current and the current corrosion intensity, and the area of ​​each reaction medium main pipe inlet and the area of ​​each reaction medium main pipe outlet are negatively correlated with the bypass current and positively correlated with the battery performance.

3. The electrocatalytic plate according to claim 2, characterized in that: The length of any branch flow channel satisfies the following expression: ； in, L represents the length of any branch flow channel, represents the internal resistance of the catalytic reaction zone, Indicates the current corrosion intensity, represents the material conductivity of the flow channel in the catalytic reaction zone, represents the cross-sectional area of ​​any branch flow channel.

4. The electrocatalytic plate according to claim 2, characterized in that: The area of ​​each of the reaction medium main pipe inlets and the area of ​​each of the reaction medium main pipe outlets satisfy the following expression: ≤5％； in, represents the area of ​​any of the reaction medium main pipe inlet or the area of ​​any of the reaction medium main pipe outlet, Represents the area of ​​the flow channel in the catalytic reaction zone.

5. The electrocatalytic plate according to any one of claims 1 to 4, characterized in that: Each of the reaction medium main pipe inlets, each of the reaction medium main pipe outlets and each of the branch flow channels are all insulated, including: The inlet of each reaction medium main pipe, the outlet of each reaction medium main pipe and each branch flow channel are insulated respectively by means of insulating coating, insulating gasket or injection molding.

6. The electrocatalytic plate according to any one of claims 1 to 4, characterized in that: The area of ​​any of the reaction medium main pipe inlets is the same as the area of ​​its corresponding reaction medium main pipe outlet.

7. The electrocatalytic plate according to any one of claims 1 to 4, characterized in that: Any reaction medium main pipe inlet and its corresponding reaction medium main pipe outlet are rotationally symmetrically arranged.

8. The electrocatalytic plate according to any one of claims 1 to 4, characterized in that: The two sides of the electrode plate are respectively a cathode field and an anode field.

9. The electrocatalytic plate according to claim 8, characterized in that: The pole plate is made of stainless steel, titanium, graphite or aluminum alloy.

10. A method for designing an electrocatalytic plate, characterized in that: For determining the electrocatalytic plate according to any one of claims 1 to 9, the method comprising: Determine the parameters of the reaction medium main pipe inlet, the reaction medium main pipe outlet and the catalytic reaction zone flow channel provided on the electrode plate according to the applicable scenario; the applicable scenario includes one of a CO2 electrocatalytic device, a water electrolysis device and a fuel cell; Each of the reaction medium main pipe inlets, each of the reaction medium main pipe outlets and each of the branch flow channels are insulated to reduce bypass current.

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