Composite polar plate and corresponding electrolytic bath and hydrogen production device

Abstract

The utility model discloses a composite polar plate, a corresponding electrolytic bath and a hydrogen production device, and belongs to the technical field of hydrogen production by electrolyzing water. The composite pole plate comprises a mastoid pole plate, mastoid structures are distributed on the mastoid pole plate, the composite pole plate further comprises a foam metal layer fixed to the side face of the mastoid pole plate, holes are formed in the foam metal layer, the positions of the holes correspond to the positions of the mastoid structures, and the sizes of the holes can contain the mastoid structures. According to the utility model, the traditional design and corresponding advantages of the mastoid pole plate are reserved, and the advantages of the foam metal are fully utilized; flow field distribution can be improved, the contact area of the polar plate and the electrode is increased, contact resistance is reduced, current-carrying capacity is improved, and water electrolysis hydrogen production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electrolytic water hydrogen production technical field relates to a kind of composite polar plate and corresponding electrolytic cell and hydrogen production device. BACKGROUND

[0002] As a kind of sustainable new clean energy, hydrogen energy becomes the new direction in recent new energy field due to the advantages of high efficiency, compressible storage and transportation, non-polluting product etc. The electricity obtained by intermittent energy such as solar energy and wind energy is converted into hydrogen energy that can be stored and transported through water electrolysis hydrogen evolution reaction, which is considered as one of the most effective ways to solve today's environmental pollution and energy crisis.

[0003] The papillary polar plate is the most commonly used polar plate for alkaline water electrolysis hydrogen production equipment, which enhances the contact between the polar plate and the electrode through the papillary structure and provides rigid support. For example, the polar plates of CN118441298A, CN118727005A and CN118756181A are all papillary polar plates, which contain papillary structures. However, the papillary polar plate has defects such as uneven flow field distribution, small contact area with the electrode, large contact resistance and weak current-carrying capacity, which seriously affect the hydrogen production efficiency and energy consumption of the equipment, and need to be overcome.

[0004] CN220564732U discloses a zero-inter-electrode-distance electrolytic cell polar plate assembly and electrolytic cell. The electrolytic cell polar plate assembly includes a main polar plate, an active electrode mesh, a diaphragm cloth, a sealing gasket and a polar plate frame. The main polar plate is fixedly connected to the polar plate frame, and the two main polar plates clamp the active electrode mesh and the diaphragm cloth to form an electrolytic cell. The main polar plate is provided with a support structure, and the active electrode mesh is a foamed nickel mesh electrode made of foamed nickel material. The technical solution discloses a main polar plate in the form of a flat plate, which is provided with a support structure and a foamed nickel mesh electrode. The foamed nickel mesh electrode increases the specific surface area of the reaction, and the foamed nickel electrode material can compensate for excessive pre-tightening force by deformation. The technical solution discloses a traditional papillary polar plate design, which loses the advantages of good rigid support performance of the papillary polar plate, and needs to add a special support structure, which is relatively complex. SUMMARY

[0005] The utility model discloses a kind of composite polar plate and corresponding electrolytic cell and hydrogen production device, foamed metal layer is fixed on the side of papillary polar plate, improve flow field distribution, increase with electrode contact area, reduce contact resistance, improve current-carrying capacity, to improve the efficiency of electrolytic water hydrogen production. The purpose of the utility model is realized by the following specific technical solutions.

[0006] A kind of composite plate, including papillary electrode plate, the papillary structure is distributed on the papillary electrode plate, further including the foam metal layer fixed on the side (can be both sides, can be one side, preferably both sides) of papillary electrode plate, the foam metal layer is provided with hole, hole position corresponds with the position of papillary structure, hole size can accommodate papillary structure.

[0007] The composite plate provided by the utility model, by the design of punching on the foam metal layer, the hole corresponds with the papillary structure, the foam metal layer can be fixed on the side of the papillary electrode plate very easily: the hole of the foam metal layer is aligned with the papillary structure, the foam metal layer is adhered to the papillary electrode plate, then the papillary electrode plate and the foam metal layer are fixed by welding or extruding in the hydrogen production electrolytic cell.The composite plate provided by the utility model not only retains the traditional design and corresponding advantages of the papillary electrode plate, but also makes full use of the advantages of the foam metal: since the foam metal has irregular metal wire diameter, it can break the laminar flow state of liquid, make more electrolyte flow into the electrode, and more easily take away bubbles, and the liquid flow field is more uniform.The foam metal has more contact points compared with the papillary electrode plate, greatly reduces the contact resistance, makes the current distribution more uniform, avoids the phenomenon of sharp discharge and current concentration.

[0008] Further, the foam metal is foam nickel or foam nickel alloy, nickel or nickel alloy has excellent corrosion resistance in alkaline environment, and is particularly suitable for alkaline water electrolysis hydrogen production.

[0009] Further, the porosity of the foam metal layer is above 80%.

[0010] Further, the pore diameter of the pore of the foam metal layer is 1-5mm.

[0011] An electrolytic cell, comprising a cell body, an electrode and a diaphragm, further comprising the composite plate provided by the utility model.

[0012] A hydrogen production device, comprising a power supply and a gas collection device, further comprising the electrolytic cell provided by the utility model.

[0013] The utility model has the following beneficial technical effects: it retains the traditional design and corresponding advantages of the papillary electrode plate, and makes full use of the advantages of the foam metal; it can improve the flow field distribution, increase the contact area of the electrode plate and the electrode, reduce the contact resistance, improve the current-carrying capacity, and improve the efficiency of electrolytic water hydrogen production. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a composite plate structure schematic diagram.

[0015] Figure 2 It is a foam metal layer structure schematic diagram.

[0016] Figure 3is a schematic view of an electrode assembly.

[0017] Figure 4 is a schematic view of each component of the electrode assembly.

[0018] Reference signs: 11-hole, 12-papillary structure, 21-foamed metal layer, 22-papillary electrode plate, 31-septum, 32-electrode, 41-gasket, 42-pole frame, 43-steel ring. DETAILED DESCRIPTION

[0019] The technical solutions of the present application will be described clearly and completely below in conjunction with the accompanying drawings of the specification. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0020] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or quantity or position.

[0021] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. Example 1

[0022] A composite electrode plate, as shown in Figure 1 includes a papillary electrode plate 22 and a foamed metal layer 21 fixed on both sides of the papillary electrode plate 22, and the papillary electrode plate 22 is distributed with papillary structures 12. The foamed metal layer 21 is as shown in Figure 2As shown, the foam metal layer 21 is a foam nickel, the porosity of the foam metal layer 21 is 90%, the average pore size is 2mm, and the foam metal layer 21 is provided with a hole 11, the position of the hole 11 corresponds to the position of the papillary structure 12, and the size of the hole 11 can accommodate the papillary structure 12. Align the hole 11 of the foam metal layer 21 with the papillary structure 12, and then adhere the foam metal layer 21 and the papillary electrode plate 22 together, and then fix the papillary electrode plate 22 and the foam metal layer 21 by welding. Example 2

[0023] A composite electrode plate, as shown in Figure 1 , comprises a papillary electrode plate 22 and a foam metal layer 21 fixed on both sides of the papillary electrode plate 22, and the papillary structure 12 is distributed on the papillary electrode plate 22. As shown in Figure 2 , the foam metal layer 21 is a foam nickel molybdenum alloy, the porosity of the foam metal layer 21 is 95%, the pore size is 5mm, and the foam metal layer 21 is provided with a hole 11, the position of the hole 11 corresponds to the position of the papillary structure 12, and the size of the hole 11 can accommodate the papillary structure 12. Align the hole 11 of the foam metal layer 21 with the papillary structure 12, and then adhere the foam metal layer 21 and the papillary electrode plate 22 together, and then fix the papillary electrode plate 22 and the foam metal layer 21 by extrusion in the hydrogen production electrolysis cell. Example 3

[0024] A hydrogen production device, comprising a power supply, a gas collection device and an electrolysis cell. The electrolysis cell comprises a cell body and an electrode assembly, and the electrode assembly, as shown in Figure 3 and Figure 4 , comprises a diaphragm 31, an electrode 32, and also comprises the composite electrode plate of Example 1 (the papillary electrode plate 22 and the foam metal layer 21 fixed on both sides of the papillary electrode plate 22). The diaphragm 31 is provided with a gasket 41 at both ends, and the composite electrode plate is provided with an electrode frame 42 and a steel ring 43 at both ends, and the gasket 41, the electrode frame 42 and the steel ring 43 are provided with through holes at the same position and are fixed by bolts. The electrode 32 is made of foam nickel molybdenum, the porosity is 92%, and the average pore size is 0.4mm. The diaphragm 31 is made of PPS diaphragm.

[0025] The electrolysis cell voltage is 1.8V, and hydrogen is produced by electrolyzing 30% KOH solution. It can be stably operated at a current density of 6500A / m 3 ; when the current density is 3500A / m 3 , the electrolysis cell voltage is only 1.65V, and the hydrogen production energy consumption is 4.0KWh / m 3 .

[0026] Comparative Example 1

[0027] A hydrogen production device, which is the same as Example 3 as a whole, except that the composite electrode plate is replaced by a traditional papillary electrode plate (i.e. without a foam metal layer 21).

[0028] The electrolytic cell voltage is 1.8V, hydrogen is prepared by electrolysis of 30% KOH solution, and the current density of stable operation can only reach 3500A / m 3 The energy consumption is 4.4KWh / m at the current density. 3

[0029] It can be seen that the composite electrode plate can greatly improve the current density of the alkaline water electrolysis hydrogen production, greatly improve the hydrogen production rate, and reduce the hydrogen production energy consumption.

[0030] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and the ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model without departing from the principles and purposes of the utility model. The protection scope of the utility model is defined by the claims and equivalent technical solutions.​

Claims

1. A composite plate comprising a papillary plate having papillary structures distributed thereon, characterized in that, The foam metal layer is fixed on the side of the nipple polar plate, and the foam metal layer is provided with holes corresponding to the positions of the nipple structures.

2. The composite plate of claim 1, wherein The foam metal layer is fixed on the two sides of the nipple polar plate.

3. The composite plate of claim 1, wherein The foam metal layer is fixed on the two sides of the nipple polar plate by welding.

4. The composite plate of claim 1, wherein The foam metal layer is fixed on the two sides of the nipple polar plate by extrusion.

5. The composite plate of claim 1, wherein The foam metal is foam nickel or foam nickel alloy.

6. The composite plate of claim 1, wherein The porosity of the foam metal layer is more than 80%.

7. The composite plate of claim 1, wherein The pore diameter of the foam metal layer is 1-5mm.

8. An electrolytic cell comprising a cell body, electrodes and a separator, characterised in that, The composite polar plate of any one of claims 1-7 is further included.

9. A hydrogen production apparatus comprising a power source and a gas collection device, characterized by, The electrolytic cell of claim 8 is further included.

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