Composite hydrogen energy bipolar plate
By installing diamond-like layers and graphite layers on the metal bipolar plates, the composite hydrogen-energy bipolar plates are formed, which solves the passivation and corrosion problems of metal bipolar plates in oxygen-rich and acidic environments, and improves its corrosion resistance and conductivity.
Patent Information
- Application Number
- CN202421559158.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-03
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-07-03
AI Technical Summary
Metal bipolar plates are prone to passivation in oxygen-rich environments and are prone to corrosion in acidic environments, affecting their lifespan and performance.
A diamond-like layer is provided on the metal substrate of the metal bipolar plate, and a graphite layer is provided on the diamond-like layer to form a composite hydrogen-energy bipolar plate. The diamond-like layer prevents acidic ions from penetration, and the graphite layer reduces contact resistance and improves conductivity.
It enhances the corrosion resistance and conductivity of the bipolar plate, reduces contact resistance, and extends the service life of the bipolar plate.
Smart Images
Figure CN222883551U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydrogen fuel cells, in particular to a composite hydrogen bipolar plate. Background Art
[0002] Hydrogen fuel cells are devices that convert chemical energy into electrical energy. They have the advantages of good environmental protection and high energy conversion efficiency, and have gradually become one of the important development directions of today's society.
[0003] The stack of hydrogen fuel cells mainly includes proton exchange membrane, catalyst, diffusion layer and bipolar plate. Among them, bipolar plates can be divided into graphite bipolar plates, metal bipolar plates and composite bipolar plates according to the material. Metal bipolar plates have good development prospects due to their light weight, small size and ability to integrate higher power in a limited space. However, the development of metal bipolar plates is restricted by the following two aspects: first, in an oxygen-rich environment, the metal surface is prone to passivation, resulting in increased contact resistance; second, in an acidic environment, the metal surface is prone to corrosion, which affects its life. Utility Model Content
[0004] In order to overcome the technical defects of the existing metal bipolar plates that the surface is easily passivated and corroded, the utility model provides a composite hydrogen energy bipolar plate.
[0005] The composite hydrogen energy bipolar plate provided by the utility model comprises a metal substrate, a diamond-like layer is arranged on the metal substrate, and a graphite layer is arranged on the diamond-like layer.
[0006] Optionally, a titanium nitride layer is provided between the metal substrate and the diamond-like carbon layer.
[0007] Optionally, a first titanium layer is provided between the titanium nitride layer and the metal substrate, and a second titanium layer is provided between the titanium nitride layer and the diamond-like carbon layer.
[0008] Optionally, the first titanium layer is deposited on the metal substrate by magnetron sputtering, and the thickness of the first titanium layer is 40 nm to 500 nm.
[0009] Optionally, the titanium nitride layer is deposited on the first titanium layer by magnetron sputtering, and the thickness of the titanium nitride layer is 10 to 500 nm.
[0010] Optionally, the second titanium layer is deposited on the titanium nitride layer by magnetron sputtering, and the thickness of the second titanium layer is 40 nm to 500 nm.
[0011] Optionally, the diamond-like carbon layer is deposited on the second titanium layer by an arc discharge method, and the thickness of the diamond-like carbon layer is 50 nm to 500 nm.
[0012] Optionally, the graphite layer is deposited on the diamond-like carbon layer by an arc discharge method, and the thickness of the graphite layer is 50 nm to 1000 nm.
[0013] Optionally, the metal substrate is a stainless steel plate, and the thickness of the metal substrate is 0.05 mm to 0.2 mm.
[0014] Compared with the prior art, the technical solution provided by the utility model has the following advantages:
[0015] The composite hydrogen energy bipolar plate provided by the utility model has a diamond-like layer on the metal substrate, and the diamond-like layer can prevent acidic ions from penetrating and contacting the metal substrate, thereby enhancing the corrosion resistance of the bipolar plate; the bipolar plate also has a graphite layer on the diamond-like layer, and the graphite layer is located at the outermost layer, which can prevent the surface of the bipolar plate from being passivated, and graphite is a good conductive material, so it can reduce the contact resistance of the bipolar plate and improve the conductivity of the bipolar plate. The utility model forms a composite metal bipolar plate by adding a diamond-like layer and a graphite layer to the metal bipolar plate, and has good conductivity and corrosion resistance, which can promote the promotion and development of metal bipolar plates. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0018] Figure 1 A schematic diagram showing the structure of a composite hydrogen energy bipolar plate in an embodiment of the utility model.
[0019] In the figure:
[0020] 1. Metal substrate; 2. First titanium layer; 3. Titanium nitride layer; 4. Second titanium layer; 5. Diamond-like carbon layer; 6. Graphite layer. DETAILED DESCRIPTION
[0021] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the scheme of the utility model will be further described below. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.
[0022] In the description, it should be noted that the terms “first” and “second” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.
[0024] The specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings.
[0025] Reference Figure 1 This embodiment provides a composite hydrogen energy bipolar plate, which is provided with a metal substrate 1, a first titanium layer 2, a titanium nitride layer 3, a second titanium layer 4, a diamond-like carbon layer 5 and a graphite layer 6 in sequence along the thickness direction of the plate.
[0026] Metal substrate 1
[0027] Specifically, the metal substrate 1 is a stainless steel plate. During production, a stamping machine is used to stamp the stainless steel plate to produce an ultra-thin stainless steel plate as a metal single-stage plate substrate, and then two metal single-stage plate substrates are welded together to form the metal substrate 1 of the bipolar plate.
[0028] Specifically, the thickness of the metal substrate 1 is 0.05 mm to 0.2 mm, for example, 0.05 mm, 0.1 mm or 0.2 mm.
[0029] It should be noted that, before the metal substrate 1 is plated, it needs to be cleaned with a cleaning agent or an acid-base solution to remove pollutants such as oil and oxides on the surface.
[0030] First titanium layer 2
[0031] Specifically, the first titanium layer 2 is deposited on the metal substrate 1 by magnetron sputtering.
[0032] Specifically, the thickness of the first titanium layer 2 is 40 nm to 500 nm, for example, 40 nm, 150 nm, 350 nm or 500 nm.
[0033] It should be noted that the first titanium layer 2 serves as a transition layer, and its main function is to improve the adhesion between the titanium nitride layer 3 and the metal substrate 1 .
[0034] Titanium nitride layer 3
[0035] Specifically, the titanium nitride layer 3 is deposited on the first titanium layer 2 by magnetron sputtering.
[0036] Specifically, the thickness of the titanium nitride layer 3 is 10 to 500 nm, for example, 10 nm, 100 nm, 300 nm or 500 nm.
[0037] It should be noted that the main function of the titanium nitride layer 3 is to enhance the corrosion resistance of the bipolar plate.
[0038] Second titanium layer 4
[0039] Specifically, the second titanium layer 4 is deposited on the titanium nitride layer 3 by magnetron sputtering.
[0040] Specifically, the thickness of the second titanium layer 4 is 40 nm to 500 nm, for example, 40 nm, 150 nm, 350 nm or 500 nm.
[0041] It should be noted that the second titanium layer 4 serves as a transition layer, and its main function is to improve the adhesion between the titanium nitride layer 3 and the diamond-like carbon layer 5 .
[0042] Diamond-like carbon layer 5
[0043] Specifically, the diamond-like carbon layer 5 is deposited on the second titanium layer 4 by an arc discharge method.
[0044] Specifically, the thickness of the diamond-like carbon layer 5 is 50 nm to 500 nm, for example, 50 nm, 150 nm, 350 nm or 500 nm.
[0045] It should be noted that the diamond-like carbon layer 5 can form a dense structure to prevent acidic ions from penetrating and contacting the second titanium layer 4, thereby enhancing the corrosion resistance of the bipolar plate.
[0046] Graphite layer 6
[0047] Specifically, the graphite layer 6 is deposited on the diamond-like carbon layer 5 by using an arc discharge method.
[0048] Specifically, the thickness of the graphite layer 6 is 50 nm to 1000 nm, for example, 50 nm, 350 nm, 700 nm or 1000 nm.
[0049] It should be noted that the graphite layer 6 is located at the outermost layer, which can prevent the surface of the bipolar plate from being passivated, and graphite is a good conductive material, so it can reduce the contact resistance of the bipolar plate and improve the conductivity of the bipolar plate.
[0050] The processing process of the composite hydrogen energy bipolar plate of this embodiment is as follows:
[0051] S1. A stainless steel plate is stamped by a stamping machine to make an ultra-thin stainless steel plate as a metal single-stage plate substrate, and then two metal single-stage plate substrates are welded together to form a metal substrate 1 of a bipolar plate;
[0052] S2. Using a cleaning agent or an acid-base solution, etc., the metal substrate 1 is cleaned to remove pollutants such as oil and oxides on the surface of the metal substrate 1;
[0053] S3. Prepare a set of vacuum coating equipment, and configure magnetron sputtering targets, arc sputtering targets, ion sources, substrate bases and other accessories in its chamber;
[0054] S4. Place the metal substrate 1 into the chamber of the vacuum coating equipment, introduce argon gas after pre-evacuation, and control the pressure in the chamber to be 1mTorr to 5mTorr;
[0055] S5. Turning on the ion source to generate argon plasma in the chamber, using the plasma to clean the metal substrate 1, further removing the oxide layer on the surface of the metal substrate 1;
[0056] S6. Depositing a first titanium layer 2 on the surface of the metal substrate 1 by magnetron sputtering;
[0057] S7. A titanium nitride layer 3 is deposited on the surface of the first titanium layer 2 by magnetron sputtering;
[0058] S8. Using magnetron sputtering method, depositing a second titanium layer 4 on the surface of the titanium nitride layer 3;
[0059] S9. Depositing a diamond-like carbon layer 5 on the surface of the second titanium layer 4 by an arc discharge method;
[0060] S10. Using an arc discharge method, a graphite layer 6 is deposited on the surface of the diamond-like carbon layer 5 .
[0061] It should be noted that during vacuum coating, the metal substrate 1 is heated through the substrate base and a negative bias is applied to the metal substrate 1 so that the coating process is also an annealing process, thereby ensuring the compactness of each layer structure.
[0062] The above is only a specific implementation of the utility model, which enables those skilled in the art to understand or implement the utility model. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.
Claims
1. A composite hydrogen energy bipolar plate, characterized in that: The invention comprises a metal substrate (1), wherein a diamond-like layer (5) is provided on the metal substrate (1), a graphite layer (6) is provided on the diamond-like layer (5), a titanium nitride layer (3) is provided between the metal substrate (1) and the diamond-like layer (5), a first titanium layer (2) is provided between the titanium nitride layer (3) and the metal substrate (1), and a second titanium layer (4) is provided between the titanium nitride layer (3) and the diamond-like layer (5).
2. The composite hydrogen energy bipolar plate according to claim 1, characterized in that: The first titanium layer (2) is deposited on the metal substrate (1) by magnetron sputtering, and the thickness of the first titanium layer (2) is 40 nm to 500 nm.
3. The composite hydrogen energy bipolar plate according to claim 2, characterized in that: The titanium nitride layer (3) is deposited on the first titanium layer (2) by a magnetron sputtering method, and the thickness of the titanium nitride layer (3) is 10 to 500 nm.
4. The composite hydrogen energy bipolar plate according to claim 3, characterized in that: The second titanium layer (4) is deposited on the titanium nitride layer (3) by magnetron sputtering, and the thickness of the second titanium layer (4) is 40 nm to 500 nm.
5. The composite hydrogen energy bipolar plate according to claim 4, characterized in that: The diamond-like carbon layer (5) is deposited on the second titanium layer (4) by an arc discharge method, and the thickness of the diamond-like carbon layer (5) is 50 nm to 500 nm.
6. The composite hydrogen energy bipolar plate according to claim 5, characterized in that: The graphite layer (6) is deposited on the diamond-like carbon layer (5) by an arc discharge method, and the thickness of the graphite layer (6) is 50 nm to 1000 nm.
7. The composite hydrogen energy bipolar plate according to any one of claims 1 to 6, characterized in that: The metal substrate (1) is a stainless steel plate, and the thickness of the metal substrate (1) is 0.05 mm to 0.2 mm.