Integrated polar plate for hydrogen production and preparation method thereof

Abstract

The invention provides an integrated polar plate for hydrogen production. The integrated polar plate comprises a polar plate body, a porous transmission layer and a microporous layer, one end of the polar plate body is provided with a water outlet, and the other end is provided with a water inlet; a runner area is arranged on one side surface of the polar plate body and between the water outlet and the water inlet; the runner area comprises a plurality of runner grooves which are arranged in parallel, and a runner ridge is arranged between every two adjacent runner grooves; the porous transmission layer abuts against the flow channel area, and the porous transmission layer, each flow channel groove and each flow channel ridge are integrally arranged; the microporous layer is arranged on the side face, away from the runner ridge, of the porous transmission layer, and the microporous layer and the porous transmission layer are integrally arranged. The invention also provides a preparation method of the integrated polar plate for hydrogen production. According to the invention, the interface resistance between the polar plate and the porous transmission layer can be greatly reduced, the cost can be greatly reduced, and the use reliability is higher.

Description

Technical Field

[0001] The present invention belongs to the technical field of fuel cells, and in particular relates to an integrated polar plate for hydrogen production and a preparation method thereof. Background Art

[0002] Hydrogen is a high-quality, clean secondary energy carrier. Promoting the use of hydrogen at the application end can achieve energy conservation and emission reduction. Hydrogen can not only be used as a green fuel in the field of transportation, but also has broad application prospects in metallurgy, petrochemicals, green methanol and green ammonia synthesis. Hydrogen can be prepared by electrolyzing water using water as a raw material. At the same time, combined with renewable energy such as wind power and photovoltaics, it can effectively solve the problem of wind and solar power abandonment and greatly improve the utilization rate of wind power and photovoltaics (i.e. intermittent and volatile energy).

[0003] Hydrogen production by water electrolysis refers to the process of producing oxygen by oxygen evolution reaction at the anode and hydrogen by hydrogen evolution reaction at the cathode under the action of direct current through an electrochemical process. The current market hydrogen production technologies by water electrolysis are mainly divided into four categories: alkaline water electrolysis (ALK), proton exchange membrane electrolysis (PEM), solid oxide water electrolysis (SOEC) and anion exchange membrane electrolysis (AEM). Among them, alkaline water electrolysis and proton exchange membrane electrolysis technologies have been commercialized, while AEM and SOEC are still in the early demonstration stage.

[0004] PEM hydrogen production equipment can work under fluctuating power supply, with high adaptability, high integration and low operation and maintenance cost. At the same time, the hydrogen output pressure can reach more than 3MPa, and the purity is higher than ALK hydrogen production, so it has attracted much attention. The PEM hydrogen production tank is mainly composed of front and rear plates, current collecting plates, insulating plates, bipolar plates BP (Bipolar plates), sealing frames and membrane electrodes (MEA). The membrane electrode includes the anode porous transport layer PTL (porous transport layer,), the anode catalyst layer, the proton exchange membrane, the cathode catalyst layer, the cathode porous transport layer PTL and the sealing frame.

[0005] In order to meet the needs of high potential and acid corrosion resistance, the existing bipolar plates use titanium plates and PTL uses titanium felt, and the surfaces need to be treated with Pt coating, which makes the coating cost too high. In addition, PTL is composed of titanium fibers with high porosity. The contact area between the PTL surface and the plate, and between the PTL surface and the catalyst layer are small, resulting in excessive interface resistance, which in turn affects the electrolysis performance. In addition, during the assembly process of the PEM electrolyzer, it is necessary to stack the bipolar plates, titanium felt, and CCM (composed of the anode catalyst layer, the proton membrane, and the cathode catalyst layer) in sequence to form the main part of the electrolyzer. The assembly process is relatively complicated and prone to positioning deviations, thereby affecting the sealing and reliability of the entire cell. In addition, the assembly pressure required for the PEM electrolyzer is large, and the unevenness of the titanium felt surface and its edge cutting can easily cause puncture of the proton membrane, thereby causing gas leakage. Summary of the invention

[0006] The embodiment of the present invention provides an integrated electrode plate for hydrogen production and a preparation method thereof, aiming to solve the problems of the existing electrolyzer stacking process being complicated and prone to deviation, the interface resistance between the electrode plate and PTL being too high, and the interface resistance between PTL and the catalyst layer being too high.

[0007] To achieve the above-mentioned purpose, on the one hand, an embodiment of the present invention provides an integrated electrode plate for hydrogen production, comprising an electrode plate body, a porous transmission layer and a microporous layer; a water outlet is provided at one end of the electrode plate body, and a water inlet is provided at the other end; a flow channel area is provided between the water outlet and the water inlet on one side surface of the electrode plate body; the flow channel area comprises a plurality of flow channel grooves arranged in parallel with each other, and a flow channel ridge is provided between two adjacent flow channel grooves; The porous transport layer is arranged in contact with the flow channel area, and the porous transport layer is respectively integrated with each of the flow channel grooves and each of the flow channel ridges; the microporous layer is arranged on the side of the porous transport layer away from the flow channel ridges, and the microporous layer is integrated with the porous transport layer.

[0008] As a preferred embodiment, the length of the porous transmission layer is the same as the length of the microporous layer; the width of the porous transmission layer is the same as the width of the microporous layer.

[0009] As a preferred embodiment, the thickness of the microporous layer is 20% to 50% of the thickness of the porous transmission layer.

[0010] As a preferred embodiment, the microporous layer is a titanium powder microporous layer; the thickness of the titanium powder microporous layer is 20 μm to 200 μm. As a preferred embodiment, the microporous layer is prepared by the following method: pre-pressing titanium powder into a uniform block at 0.4 MPa to 60 MPa to obtain a microporous layer; the particle size of the titanium powder is ≥ 50 nm.

[0011] As a preferred embodiment, the porous transmission layer is titanium felt; the thickness of the titanium felt is 100 μm to 400 μm. As a preferred embodiment, the integrated arrangement is achieved by sintering; the sintering is atmosphere furnace sintering or discharge plasma sintering.

[0012] As a preferred embodiment, the sintering temperature is 750° C. to 1350° C.; the sintering time is 2 min to 6 h; and the oxygen partial pressure during sintering is ≤100 Pa.

[0013] As a preferred embodiment, an outlet buffer zone is arranged between the flow channel zone and the water outlet, and an inlet buffer zone is arranged between the flow channel zone and the water inlet, and the flow channel zone is connected to the outlet buffer zone and the inlet buffer zone respectively; the outlet buffer zone is connected to the water outlet, and the inlet buffer zone is connected to the water inlet.

[0014] As a preferred embodiment, a sealing strip groove is provided at the edge of the electrode plate body, and the water outlet, the water inlet, the flow channel area, the outlet buffer area and the inlet buffer area are all provided inside the sealing strip groove.

[0015] On the other hand, an embodiment of the present application also provides a method for preparing the integrated electrode plate for hydrogen production, comprising the following steps: abutting the porous transport layer against the flow channel area of ​​the electrode plate body, applying pressure to the porous transport layer, and then sintering the porous transport layer and each flow channel groove and each flow channel ridge of the flow channel area to be integrated; the pressure is ≥0.04MPa.

[0016] As a preferred embodiment, the sintering is preferably carried out in an inert gas or a vacuum; the sintering is atmosphere furnace sintering or spark plasma sintering.

[0017] As a preferred embodiment, the inert gas is at least one of argon or helium; the sintering temperature is 750°C to 1350°C; the sintering time is 2 minutes to 6 hours; and the oxygen partial pressure during sintering is ≤100Pa.

[0018] As a preferred embodiment, the method for preparing the integrated electrode plate for hydrogen production further includes the following steps: abutting the side of the porous transport layer away from the flow channel ridge against the microporous layer, and then sintering until the microporous layer and the porous transport layer are integrated.

[0019] As a preferred embodiment, the sintering is atmosphere furnace sintering or spark plasma sintering.

[0020] As a preferred embodiment, the sintering temperature is 750° C. to 1350° C.; the sintering time is 2 min to 6 h; and the oxygen partial pressure during sintering is ≤100 Pa.

[0021] As a preferred embodiment, the electrode plate body is a pretreated electrode plate body; and the porous transmission layer is a pretreated porous transmission layer.

[0022] Preferably, the pretreatment is achieved by: washing with a first solvent, then removing impurities with a second solvent, and then washing with water; The first solvent is water or ethanol; the second solvent is an acid solvent or an alkaline solvent. Through pretreatment, the plate body and the porous transmission layer can be cleaned, and the impurities and stains on the surface can be removed, effectively ensuring the performance of the plate body and the porous transmission layer.

[0023] Preferably, the cleaning method is wiping or ultrasonic cleaning; the acid solvent is at least one of sulfuric acid, hydrochloric acid or hydrofluoric acid; the alkaline solvent is at least one of sodium hydroxide, potassium hydroxide or carbonate.

[0024] Compared with the prior art, this application has the following technical effects and advantages: (1) The present application sintered the electrode body, porous transport layer (PTL) and microporous layer (MPL) to form an integrated structure, which can significantly reduce the interface resistance between the electrode plate (i.e., bipolar plate BP) and the porous transport layer; and the contact area between the porous transport layer and the catalytic layer can be increased through the microporous layer, which is beneficial to reducing the interface resistance and effectively promoting the gas-liquid transmission capacity.

[0025] (2) At the same time, by sintering the electrode body, the porous transport layer and the microporous layer to form an integrated structure, the side where the porous transport layer abuts against the electrode body, the side where the electrode body abuts against the porous transport layer, and the side where the porous transport layer abuts against the microporous layer do not need to be coated, and the conductivity of the electrolytic cell will not be reduced, and the cost can be greatly reduced.

[0026] (3) The structure of the present application is more conducive to the assembly of the electrolytic cell. It only needs to stack the structure of the present application and the CCM in sequence. The process is simpler and the assembly deviation of the traditional titanium felt can be avoided. The reliability of the entire cell is effectively improved, and the life of the fuel cell or electrolytic cell can be effectively guaranteed.

[0027] (4) The structure of the present application can avoid the risk of puncture caused by the edge of the titanium felt, and the addition of the microporous layer can also reduce the puncture effect on the proton membrane in the plane, which has higher safety and reliability. The present application has a simple structure and a simple processing technology, and is suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1 This is a schematic diagram of the structure of an integrated plate for hydrogen production according to an embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure of an integrated plate for hydrogen production; Figure 3 yes Figure 1 SEM schematic diagram of the surface of the microporous layer of the integrated plate for hydrogen production; Figure 4 Schematic diagram of the cross-sectional structure of the hydrogen production plate of Comparative Example 1; Figure 5 for Figure 4 SEM schematic diagram of the porous transport layer surface of the hydrogen production plate. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only 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.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0032] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] Specifically, on the one hand, Figures 1 to 3 As shown, an embodiment of the present invention provides an integrated electrode plate for hydrogen production, comprising an electrode plate body 10, a porous transmission layer 20 and a microporous layer 30; a water outlet 11 is provided at one end of the electrode plate body 10, and a water inlet 12 is provided at the other end; a flow channel area 13 is provided between the water outlet 11 and the water inlet 12 on one side surface of the electrode plate body 10; the flow channel area 13 includes a plurality of flow channel grooves 131 arranged in parallel with each other, and a flow channel ridge 132 is provided between two adjacent flow channel grooves 131; The porous transport layer 20 is arranged in contact with the flow channel area 13, and the porous transport layer 20 is respectively integrated with each of the flow channel grooves 131 and each of the flow channel ridges 132; the microporous layer 30 is arranged on the side of the porous transport layer 20 away from the flow channel ridges 132, and the microporous layer 30 is integrated with the porous transport layer 20.

[0036] In the embodiments of the present application, the porous transport layer is integrated with the flow channel ridge (flow channel groove) of the electrode plate body and connected as one, and the microporous layer is integrated with the porous transport layer and connected as one, so that the side where the porous transport layer abuts against the electrode plate body, the side where the electrode plate body abuts against the porous transport layer, and the side where the porous transport layer abuts against the microporous layer do not need to be coated, and the conductivity of the electrolytic cell will not be reduced, and the cost can be effectively reduced, the preparation process of the electrolytic cell can be simplified, and the life of the fuel cell or electrolytic cell can be effectively guaranteed.

[0037] As a preferred embodiment, the length of the porous transmission layer 20 is the same as that of the microporous layer 30; the width of the porous transmission layer 20 is the same as that of the microporous layer 30. In this way, the microporous layer can reduce the puncture effect on the proton membrane in the plane, and has higher safety and reliability in use.

[0038] As a preferred embodiment, the thickness of the microporous layer 30 is 20% to 50% of the thickness of the porous transport layer 20 (depending on the actual use requirements, it can be 20%, 30%, 40%, 50%, etc.). By controlling the thickness ratio between the microporous layer and the porous transport layer, the interface resistance between the electrode plate and the porous transport layer can be greatly reduced, and the contact area between the porous transport layer and the catalytic layer can be effectively increased, effectively promoting the gas-liquid transmission capacity.

[0039] As a preferred embodiment, the microporous layer 30 is a titanium powder microporous layer; the thickness of the titanium powder microporous layer is 20 μm to 200 μm (depending on the actual use requirements, it can be 20 μm, or 50 μm, or 100 μm, or 200 μm, etc.).

[0040] As a preferred embodiment, the microporous layer 30 is prepared by the following method: pre-pressing titanium powder into a uniform block at 0.4 MPa to 60 MPa (depending on the actual use requirements, it can be 0.4 MPa, or 2 MPa, or 10 MPa, or 30 MPa, or 60 MPa, etc.) to obtain a microporous layer; the particle size of the titanium powder is ≥50 nm.

[0041] In one embodiment, the pre-pressing pressure is 50 MPa, and the particle size of the titanium powder is ≥50 nm, so that the formed microporous layer has a pore size that matches the porous transmission layer, which helps to reduce the interface resistance while ensuring that the microporous layer has a large surface area.

[0042] By controlling the pre-pressing pressure to 0.4MPa~60Mpa, it is possible to ensure the molding of the microporous layer and enable the molded microporous layer to have a pore size that matches the porous transport layer. While ensuring that the microporous layer has a large surface area (the surface area can effectively increase the contact area between the porous transport layer and the catalytic layer), it is beneficial to reduce the interface resistance, thereby ensuring the excellent performance of the porous transport layer.

[0043] As a preferred embodiment, the porous transmission layer 20 is titanium felt; the thickness of the titanium felt is 100 μm to 400 μm (depending on the actual use requirements, it can be 100 μm, or 150 μm, or 200 μm, or 250 μm, or 300 μm, or 400 μm, etc.). Generally speaking, the thicker the titanium felt is, the greater its porosity is, so that the porous transmission layer is compatible with the formed microporous layer, which is beneficial to reduce the interface resistance while ensuring that the microporous layer has a large surface area; for example, when the thickness of the titanium felt is 250 μm, the porosity is about 56%; when the thickness of the titanium felt is 400 μm, the porosity is generally about 78%, and the corresponding selection can be made according to the actual use requirements.

[0044] As a preferred embodiment, the integrated configuration is achieved by sintering; the sintering is atmosphere furnace sintering or spark plasma sintering.

[0045] As a preferred embodiment, the sintering temperature is 750°C to 1350°C (depending on the actual use needs, it can be 750°C, or 850°C, or 1050°C, or 1200°C, or 1350°C, etc.); the sintering time is 2min to 6h (depending on the actual use needs, it can be 2min, or 30min, or 1h, or 3h, or 6h, etc.); the oxygen partial pressure during sintering is ≤100Pa.

[0046] As a preferred embodiment, an outlet buffer zone 14 is provided between the flow channel area 13 and the water outlet 11, an inlet buffer zone 15 is provided between the flow channel area 13 and the water inlet 12, the flow channel area 13 is connected to the outlet buffer zone 14 and the inlet buffer zone 15 respectively; the outlet buffer zone 14 is connected to the water outlet 11, and the inlet buffer zone 15 is connected to the water inlet 12. By providing the buffer zone, the residence time of the liquid in the flow channel area can be effectively prolonged to ensure sufficient reaction.

[0047] The water inlet and the water outlet of the present application are arranged diagonally, which can further effectively prolong the residence time of the liquid in the flow channel area and ensure sufficient reaction.

[0048] As a preferred embodiment, the edge of the electrode plate body 10 is provided with a sealing rubber strip groove 16, and the water outlet 11, the water inlet 12, the flow channel area 13, the outlet buffer area 14 and the inlet buffer area 15 are all arranged inside the rubber strip groove 16. In this way, the sealing of the electrode body can be effectively guaranteed.

[0049] On the other hand, an embodiment of the present application also provides a method for preparing the integrated electrode plate for hydrogen production, comprising the following steps: abutting the porous transport layer against the flow channel area of ​​the electrode plate body, applying pressure to the porous transport layer, and then sintering the porous transport layer and each flow channel groove and each flow channel ridge of the flow channel area to be integrated; the pressure is ≥0.04MPa.

[0050] As a preferred embodiment, the sintering is preferably carried out in an inert gas or vacuum (; the sintering is atmosphere furnace sintering or spark plasma sintering.

[0051] As a preferred embodiment, the inert gas is at least one of argon or helium; the sintering temperature is 750°C to 1350°C (depending on the actual use needs, it can be 750°C, or 850°C, or 1050°C, or 1200°C, or 1350°C, etc.); the sintering time is 2min to 6h (depending on the actual use needs, it can be 2min, or 30min, or 1h, or 3h, or 6h, etc.); the oxygen partial pressure during sintering is ≤100Pa. The sintering time is generally selected according to the different pre-pressing pressure and sintering temperature. By controlling the sintering conditions, the porous transport layer can be integrated with each of the flow channel grooves and each of the flow channel ridges in the flow channel area, while ensuring the effectiveness of the contact between the porous transport layer and the microporous layer, thereby ensuring the excellent performance of the porous transport layer.

[0052] Specifically, in one embodiment, the applied pressure is 5 MPa, the inert gas is argon, the oxygen partial pressure is ensured to be less than 10 Pa, the sintering method is discharge plasma sintering, the sintering temperature is 800° C., and the sintering time is 15 min. The test results of the electrolysis performance of the electrode plate are shown in Table 1.

[0053] As a preferred embodiment, the method for preparing the integrated electrode plate for hydrogen production further includes the following steps: abutting the side of the porous transport layer away from the flow channel ridge against the microporous layer, and then sintering until the microporous layer and the porous transport layer are integrated.

[0054] As a preferred embodiment, the sintering is atmosphere furnace sintering or spark plasma sintering.

[0055] As a preferred embodiment, the sintering temperature is 750°C to 1350°C (depending on the actual use requirements, it can be 750°C, or 850°C, or 1050°C, or 1200°C, or 1350°C, etc.); the sintering time is 2min to 6h (depending on the actual use requirements, it can be 2min, or 30min, or 1h, or 3h, or 6h, etc.); the oxygen partial pressure during sintering is ≤100Pa. By controlling the sintering conditions, the porous transport layer can be integrated with the microporous layer while ensuring the effectiveness of the contact between the porous transport layer and the microporous layer, which can effectively increase the contact area between the porous transport layer and the catalytic layer, which is conducive to reducing the interface resistance, thereby ensuring the excellent performance of the porous transport layer.

[0056] Specifically, in one embodiment, the oxygen partial pressure during sintering is 10 Pa, the sintering method is discharge plasma sintering, the sintering temperature is 1300° C., and the sintering time is 30 min. The test results of the electrolysis performance of the electrode plate are shown in Table 1.

[0057] As a preferred embodiment, the electrode plate body is a pretreated electrode plate body; and the porous transmission layer is a pretreated porous transmission layer.

[0058] Preferably, the pretreatment is achieved by: washing with a first solvent, then removing impurities with a second solvent, and then washing with water; The first solvent is water or ethanol; the second solvent is an acid solvent or an alkaline solvent. Through pretreatment, the plate body and the porous transmission layer can be cleaned, and the impurities and stains on the surface can be removed, effectively ensuring the performance of the plate body and the porous transmission layer.

[0059] Preferably, the cleaning method is wiping or ultrasonic cleaning; the acid solvent is at least one of sulfuric acid (0.5M / L sulfuric acid), hydrochloric acid or hydrofluoric acid; the alkaline solvent is at least one of sodium hydroxide (1M / L sodium hydroxide solution), potassium hydroxide or carbonate.

[0060] Specifically, in one embodiment, ultrasonic cleaning can be used, 0.5M / L sulfuric acid is used for acid washing for 1 hour, 1M / L sodium hydroxide solution is used for alkaline washing for 1 hour, and finally water washing is used to remove residual acid and alkali. The electrolysis water performance test results of the prepared electrode plate are shown in Table 1.

[0061] Comparative Example 1 A hydrogen production plate, such as Figures 4 to 5 As shown, the structure includes a plate body 10 and a porous transmission layer 20 , and the porous transmission layer 20 is movably arranged on the flow channel area of ​​the plate body 10 .

[0062] Comparative Example 2 A hydrogen production plate comprises a plate body 10 and a porous transmission layer 20. The porous transmission layer 20 is arranged on a flow channel region of the plate body 10 by sintering.

[0063] The method for preparing the hydrogen production plate specifically comprises the following steps: S01: Use water, ethanol and other solvents to fully clean the porous transport layer and the plate body, use acid or alkali to remove surface impurities and stains, and then wash away excess acid or alkali with water; S02: Laminating the porous transport layer and the electrode plate with flow channel, applying pressure, and then sintering them into one in an inert gas atmosphere.

[0064] In step S01, the cleaning method is ultrasonic cleaning, the acid is 0.5M / L sulfuric acid, and the acid washing is for 1 hour, and the alkali is 1M / L sodium hydroxide solution, and the alkali washing is for 1 hour.

[0065] In step S02, after the porous transport layer is bonded to the electrode plate, the applied pressure is 5 MPa, the inert gas is argon, and the oxygen partial pressure is ensured to be less than 10 Pa. The sintering method is discharge plasma sintering, the sintering temperature is 1300°C, and the sintering time is 30 min.

[0066] The polarity electrolysis water performance of the electrode plate of an embodiment of the present application and the electrode plates of comparative examples 1 and 2 was tested, and the results are shown in Table 1. As can be seen from Table 1, at the same current density, the electrode plate of the embodiment of the present application requires a lower voltage to achieve water electrolysis, and the interface resistance of the electrode plate of the embodiment of the present application is lower, and has better gas-liquid transmission capability.

[0067] Table 1 Test results of water electrolysis performance of Example 1 of the present application and Comparative Examples 1-2 <![CDATA[Current density (A / cm 2 ).]]> 0.04 0.1 0.2 0.3 0.4 0.6 0.8 1.2 1.6 2.0 Voltage of the present application embodiment (V) 1.416 1.435 1.454 1.470 1.486 1.513 1.540 1.592 1.649 1.706 Comparative Example 1 Voltage (V) 1.421 1.445 1.471 1.494 1.514 1.551 1.586 1.657 1.727 1.804 Comparative Example 2 Voltage (V) 1.410 1.436 1.461 1.481 1.499 1.530 1.560 1.622 1.684 1.757 In the description of this specification, the description with reference to the terms "an embodiment", "example", 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 present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0068] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated plate for hydrogen production, characterized in that: It comprises an electrode plate body, a porous transmission layer and a microporous layer; a water outlet is arranged at one end of the electrode plate body, and a water inlet is arranged at the other end; a flow channel area is arranged between the water outlet and the water inlet on one side surface of the electrode plate body; the flow channel area comprises a plurality of flow channel grooves arranged in parallel with each other, and a flow channel ridge is arranged between two adjacent flow channel grooves; The porous transport layer is arranged in contact with the flow channel area, and the porous transport layer is respectively integrated with each of the flow channel grooves and each of the flow channel ridges; the microporous layer is arranged on the side of the porous transport layer away from the flow channel ridges, and the microporous layer is integrated with the porous transport layer.

2. The integrated plate for hydrogen production according to claim 1, characterized in that: The length of the porous transmission layer is the same as that of the microporous layer; the width of the porous transmission layer is the same as that of the microporous layer; and the thickness of the microporous layer is 20% to 50% of the thickness of the porous transmission layer.

3. The integrated plate for hydrogen production according to claim 1, characterized in that: The microporous layer is a titanium powder microporous layer; the thickness of the titanium powder microporous layer is 20 μm to 200 μm; The microporous layer is prepared by the following method: pre-pressing titanium powder into a uniform block at 0.4MPa-60Mpa to obtain the microporous layer; the particle size of the titanium powder is ≥50nm.

4. The integrated plate for hydrogen production according to claim 1, characterized in that: The porous transmission layer is titanium felt; the thickness of the titanium felt is 100 μm to 400 μm; The integrated configuration is achieved by sintering; the sintering is atmosphere furnace sintering or discharge plasma sintering.

5. The integrated plate for hydrogen production according to claim 4, characterized in that: The sintering temperature is 750° C. to 1350° C.; the sintering time is 2 min to 6 h; and the oxygen partial pressure during sintering is ≤100 Pa.

6. The integrated plate for hydrogen production according to claim 1, characterized in that: An outlet buffer is provided between the flow channel area and the water outlet, and an inlet buffer is provided between the flow channel area and the water inlet. The flow channel area is connected to the outlet buffer and the inlet buffer respectively; the outlet buffer is connected to the water outlet, and the inlet buffer is connected to the water inlet; The edge of the electrode plate body is provided with a rubber strip groove for sealing, and the water outlet, the water inlet, the flow channel area, the outlet buffer area and the inlet buffer area are all arranged on the inner side of the rubber strip groove.

7. The method for preparing an integrated plate for hydrogen production according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: abutting the porous transport layer against the flow channel area of ​​the electrode plate body, applying pressure to the porous transport layer, and then sintering the porous transport layer and each flow channel groove and each flow channel ridge of the flow channel area to be integrated; the pressure is ≥0.04MPa.

8. The method for preparing the integrated plate for hydrogen production according to claim 7, characterized in that: The sintering is carried out in an inert gas or vacuum; the sintering is atmosphere furnace sintering or discharge plasma sintering; The inert gas is at least one of argon and helium; the sintering temperature is 750° C. to 1350° C.; the sintering time is 2 min to 6 h; and the oxygen partial pressure during sintering is ≤100 Pa.

9. The method for preparing the integrated plate for hydrogen production according to claim 7, characterized in that: The method for preparing the integrated electrode plate for hydrogen production further includes the following steps: abutting the side of the porous transport layer away from the flow channel ridge against the microporous layer, and then sintering until the microporous layer and the porous transport layer are integrated.

10. The method for preparing the integrated plate for hydrogen production according to claim 9, characterized in that: The sintering is atmosphere furnace sintering or discharge plasma sintering; The sintering temperature is 750° C. to 1350° C.; the sintering time is 2 min to 6 h; and the oxygen partial pressure during sintering is ≤100 Pa.

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