CN211957794U - Composite coating for fuel cell polar plate - Google Patents
Composite coating for fuel cell polar plate Download PDFInfo
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- CN211957794U CN211957794U CN201922212344.XU CN201922212344U CN211957794U CN 211957794 U CN211957794 U CN 211957794U CN 201922212344 U CN201922212344 U CN 201922212344U CN 211957794 U CN211957794 U CN 211957794U
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- fuel cell
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- polar plate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The utility model discloses a composite coating for fuel cell polar plate, include: a conductive corrosion-resistant coating and a hydrophobic material film layer; the conductive corrosion-resistant coating is formed by compounding one or more of metal, metal carbide or carbon materials deposited on the surface of the fuel cell pole plate; the hydrophobic coating is a hydrophobic material film layer deposited on the bottom of the runner groove of the reaction area of the metal polar plate and the upper surface of the conductive corrosion-resistant coating in the distribution area. The composite coating for the fuel cell polar plate can be maintained in a high-potential and acid environment, has a complete structure and is not easy to oxidize; the water generated on the surface of the metal polar plate in the use process of the fuel cell stack is ensured to be quickly discharged, the durability of the metal polar plate is improved, and the service life of the metal polar plate is prolonged.
Description
Technical Field
The utility model relates to a proton exchange membrane fuel cell polar plate coating field, concretely relates to composite coating for reinforcing fuel cell polar plate drainage performance.
Background
Proton Exchange Membrane Fuel Cells (PEMFCs) are power generation devices that can efficiently convert hydrogen fuel and oxidant air into electrical energy directly through electrochemical reaction, and the product is water, which is green and pollution-free. The core of the PEMFC is a Membrane Electrode Assembly (MEA) and a polar plate, the MEA is a place for electrochemical reaction, the polar plate of the metal base material has good electric conduction and heat conduction performance, can realize batch forming, and has important significance in realizing uniform distribution of gas and current collection. However, when the metal flow field plate is used in a proton exchange membrane fuel cell, the metal flow field plate is easily affected by the acidic environment inside the stack, and various elements or ions in the metal flow field plate, such as iron ions, can be lost from the metal plate, thereby polluting the MEA and poisoning the catalyst in the MEA. In addition, in the fuel cell stack, the electrochemical reaction occurs in the catalyst layer between the gas diffusion electrode and the proton exchange membrane, the redundant water needs to pass through the gas diffusion layer and enter the flow channel to be discharged, along with the electrochemical reaction, the gas channel forms two-phase flow, when the generated water can not be smoothly discharged, the generated water is enriched at the bottom of the flow channel to form water logging, after the water logging, the reactant and the reaction product enter the channel of the reaction area to be occupied, the mass transfer process is deteriorated, the reaction area is reduced at the same time, the performance of the cell is attenuated to a great extent, and meanwhile, the coating is corroded by different degrees, so that the performance and the service life of the proton exchange membrane fuel cell are influenced.
For example, patent document CN102800871A discloses a method for depositing a chromium carbide step mixed coating on the surface of a stainless steel electrode plate by using a magnetron reactive sputtering technique, and controlling the formation of chromium carbide in different states by adjusting the current of a Cr target and a C target to adjust the components of the step coating, thereby improving the corrosion resistance of the metal electrode plate and reducing the contact resistance. Patent document CN201410037787.9 discloses a method for solving flooding problem of a catalyst layer of a fuel cell, an ultrathin catalyst layer and a preparation method thereof, wherein the method for solving flooding problem is realized by using an ultrathin catalyst layer composed of a catalyst layer with a porous structure not more than 20nm and an ionic polymer filling layer with a thickness not more than 5 nm; however, the method is complex to regulate and control, and a reasonable solution is provided for solving the problem of flooding inside the fuel cell from the perspective of the metal polar plate.
SUMMERY OF THE UTILITY MODEL
The utility model provides a composite coating for fuel cell polar plate can strengthen the drainage function of fuel cell polar plate to solve the problem of the not smooth battery performance decay that leads to of the interior metal polar plate drainage of fuel cell who exists among the prior art.
The utility model discloses a composite coating for fuel cell polar plate, a serial communication port, include: a conductive corrosion-resistant coating and a hydrophobic material film layer; the conductive corrosion-resistant coating is arranged on the surface of the fuel cell polar plate and is a coating formed by one or more layers of metal, metal carbide or carbon material; the hydrophobic material film layer is arranged on the upper surface of the conductive corrosion-resistant coating at the bottom of the runner groove of the distribution area and/or the reaction area of the fuel cell polar plate and is a film layer made of a hydrophobic material;
the metal is one of chromium (Cr), nickel (Ni), titanium (Ti), niobium (Nb), gold (Au), rhodium (Rh), palladium (Pd), tantalum (Ta), tungsten (W) and zirconium (Zr); the metal carbide is one of carbide of chromium (Cr), carbide of nickel (Ni), carbide of titanium (Ti), carbide of niobium (Nb), carbide of tantalum (Ta), carbide of tungsten (W) or carbide of zirconium (Zr); the carbon material is one of graphene, carbon nano tube or amorphous carbon;
the hydrophobic material comprises but is not limited to one of F-containing organic polymer, methyl sodium silicate salt, polyvinyl alcohol (PVA), nano silicon dioxide (SiO 2), nano fluorine silicon dioxide (F-SiO 2), columnar nanotube and other materials;
wherein the F-containing organic polymer is one of Polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (such as FEP), ethylene-tetrafluoroethylene copolymer (ETFE), and copolymer (PFA) of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene; the nano fluorine silica is fluorine-doped nano silica, and is prepared by grafting fluorine modified alkyl silane on the surface of silica particles, for example, the nano fluorine silica is prepared by adopting a method of Chinese patent document CN 104445218A; the columnar carbon nano tube is formed by arranging single-walled carbon nano tubes with the diameter of 2-20 nm or multi-walled carbon nano tubes with the diameter of 40-2 nm in a row, and the length of the arranged row is 100 nm-2 um.
The utility model discloses a composite coating for fuel cell polar plate, compare with current coating, the corrosion-resistant coating of metal polar plate surface high conductance, can maintain under high potential and acid environment, complete structure has, the characteristics of difficult oxidation, guarantee fuel cell's stable output, and the flow field is regional with distribute regional hydrophobic mixed coating, can ensure that the fuel cell pile produces the water on metal polar plate surface and discharges fast in the use, solve the water logging problem, show the performance of reinforcing at fuel cell, improve metal polar plate durability and life.
Drawings
FIG. 1 is a schematic view of a composite coating for a fuel cell plate of the present invention; wherein: 1-a fuel cell pole plate, 11-a conductive corrosion-resistant coating and 12-a hydrophobic material membrane layer;
FIG. 2 is a view of a flow field region of a metal plate; wherein: 1-a fuel cell pole plate, 2-a distribution area, 3-a reaction area and 12-a hydrophobic material membrane layer;
FIG. 3 is a side cross-section of a metal plate in an assembled stack; wherein, 1-a fuel cell polar plate, 4-a proton exchange membrane electrode, 11-a conductive corrosion resistant coating and 12-a hydrophobic material membrane layer.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
A composite coating for a fuel cell plate, as shown in fig. 1 and 2, comprising: a conductive corrosion-resistant coating 11 and a hydrophobic material film layer 12; the conductive corrosion-resistant coating 11 is arranged on the surface of the fuel cell pole plate 1 and is a coating formed by one or more layers of metal, metal carbide or carbon material, and the conductive corrosion-resistant bottom layer has the durability in the fuel cell acidic environment and meets the durability requirement on the metal pole plate in the fuel cell environment; the hydrophobic material film 12 is arranged on the upper surface of the conductive corrosion-resistant coating 11 at the bottom of the runner groove of the distribution area 2 and/or the reaction area 3 of the fuel cell polar plate 1 and is a film made of a layer of hydrophobic material;
the metal is one of chromium (Cr), nickel (Ni), titanium (Ti), niobium (Nb), gold (Au), rhodium (Rh), palladium (Pd), tantalum (Ta), tungsten (W) and zirconium (Zr); the metal carbide is one of carbide of chromium (Cr), carbide of nickel (Ni), carbide of titanium (Ti), carbide of niobium (Nb), carbide of tantalum (Ta), carbide of tungsten (W) or carbide of zirconium (Zr); the carbon material is one of graphene, carbon nano tube or amorphous carbon;
the hydrophobic material comprises but is not limited to one or more of F-containing organic polymer, methyl sodium silicate salt, polyvinyl alcohol (PVA), nano silicon dioxide (SiO 2), nano fluorine silicon dioxide (F-SiO 2), columnar carbon nanotube and other materials;
wherein the F-containing organic polymer is one or more of Polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (such as FEP), ethylene-tetrafluoroethylene copolymer (ETFE), copolymer of perfluoropropyl perfluorovinyl ether and Polytetrafluoroethylene (PFA); the nano fluorine silica is fluorine-doped nano silica, and is prepared by grafting fluorine modified alkyl silane on the surface of silica particles, for example, the nano fluorine silica is prepared by adopting a method of Chinese patent document CN 104445218A; the columnar carbon nano tube is formed by arranging single-walled carbon nano tubes with the diameter of 2-20 nm or multi-walled carbon nano tubes with the diameter of 40-2 nm in a row, and the length of the arranged row is 100 nm-2 um.
Further, the thickness of the conductive corrosion-resistant coating 11 is 1-5000 nm; the thickness of the hydrophobic material film layer is 1-2000 nm.
Further, the contact angle of the hydrophobic material membrane layer 12 and water is more than 100 degrees, and the sliding angle relative to the water is less than 20 degrees.
In one embodiment, the conductive corrosion-resistant coating 11 is provided on the surface of the fuel cell plate 1 and is composed of a layer of metal Ti and a layer of Cr-C carbide (chromium carbide); at the bottom of the runner groove of the reaction area 3 of the fuel cell polar plate 1, the hydrophobic material film 12 is arranged on the upper surface of the conductive corrosion-resistant coating and is a film formed by a layer of hydrophobic material nano fluorine silicon dioxide; the contact angle of the hydrophobic material membrane layer and water is 125 degrees, the sliding angle relative to the water is less than 20 degrees, and the sliding angle relative to the water is 1.8 degrees.
In one embodiment, the conductive corrosion-resistant coating 11 is formed on the surface of the fuel cell plate 1 and is made of a layer of W-C carbide (tungsten carbide); at the bottom of the runner groove of the reaction area 3 of the fuel cell polar plate 1, the hydrophobic material film 12 is arranged on the upper surface of the conductive corrosion-resistant coating and is a film made of a layer of hydrophobic material PTFE; the contact angle of the hydrophobic material membrane layer and water is 123 degrees, and the sliding angle relative to the water is 1 degree.
In one embodiment, the conductive corrosion-resistant coating 11 is provided on the surface of the fuel cell plate 1 and is composed of a layer of Ti-C carbide (titanium carbide) and a layer of W-C carbide (tungsten carbide); at the bottom of the runner groove of the reaction area 3 of the fuel cell polar plate 1, the hydrophobic material film 12 is arranged on the upper surface of the conductive corrosion-resistant coating and is a film formed by a layer of hydrophobic material nano SiO2 and nano F-SiO 2; the contact angle of the hydrophobic material membrane layer and water is 128 degrees, and the sliding angle relative to the water is 3 degrees.
In one embodiment, the conductive corrosion-resistant coating 11 is formed on the surface of the fuel cell plate 1 and is made of a layer of Ti — C carbide (titanium carbide); the hydrophobic material membrane 12 is arranged on the upper surface of the conductive corrosion-resistant coating at the bottoms of the flow channels of the distribution area 2 and the reaction area 3 of the fuel cell polar plate 1 and is a membrane formed by a layer of hydrophobic material high polymer fluoride (ethylene-tetrafluoroethylene copolymer ETFE); the contact angle of the hydrophobic material membrane layer and water is 126 degrees, and the sliding angle relative to the water is 1.5 degrees.
In one embodiment, the conductive corrosion-resistant coating 11 is disposed on the surface of the fuel cell plate 1 and is composed of a layer of metal Ti and a layer of graphene; in the distribution region 2 of the fuel cell polar plate 1, the hydrophobic material film 12 is arranged on the upper surface of the conductive corrosion-resistant coating and is a film made of a layer of hydrophobic material polyvinyl alcohol; the contact angle of the hydrophobic material membrane layer and water is 125 degrees, and the sliding angle relative to the water is 2 degrees.
Claims (5)
1. A composite coating for a fuel cell plate, comprising: a conductive corrosion-resistant coating (11) and a hydrophobic material film layer (12); the conductive corrosion-resistant coating (11) is arranged on the surface of the fuel cell polar plate (1) and is a coating formed by one or more layers of metal, metal carbide or carbon material; and the hydrophobic material film layer (12) is arranged on the upper surface of the conductive corrosion-resistant coating at the bottom of the flow channel groove of the distribution area (2) and/or the reaction area (3) of the fuel cell polar plate (1) and is a film layer made of a hydrophobic material.
2. The composite coating for a fuel cell plate of claim 1, wherein the metal is one of chromium, nickel, titanium, niobium, gold, rhodium, palladium, tantalum, tungsten, zirconium; the metal carbide is one of chromium carbide, nickel carbide, titanium carbide, niobium carbide, tantalum carbide, tungsten carbide or zirconium carbide; the carbon material is one of graphene, carbon nano tube or amorphous carbon; the hydrophobic material comprises one of an organic polymer containing F, methyl sodium silicate salt, polyvinyl alcohol, nano silicon dioxide, nano fluorine silicon dioxide and columnar carbon nano tubes.
3. The composite coating for a fuel cell plate of claim 2, wherein the F-containing organic polymer is one of polytetrafluoroethylene, fluorinated ethylene propylene copolymer, ethylene-tetrafluoroethylene copolymer, perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene copolymer; the nano fluorine silica is fluorine-doped nano silica and is prepared by grafting fluorine modified alkyl silane on the surface of silica particles; the columnar carbon nano tube is formed by arranging single-walled carbon nano tubes with the diameter of 2-20 nm or multi-walled carbon nano tubes with the diameter of 40-2 nm in a row, and the length of the arranged row is 100 nm-2 um.
4. The composite coating for a fuel cell plate according to claim 1, wherein the thickness of the conductive corrosion-resistant coating (11) is 1 to 5000 nm; the thickness of the hydrophobic material film layer (12) is 1-2000 nm.
5. The composite coating for a fuel cell plate according to claim 1, wherein the membrane layer (12) of hydrophobic material has a contact angle with water of more than 100 ° and a sliding angle with respect to water of less than 20 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922212344.XU CN211957794U (en) | 2019-12-11 | 2019-12-11 | Composite coating for fuel cell polar plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922212344.XU CN211957794U (en) | 2019-12-11 | 2019-12-11 | Composite coating for fuel cell polar plate |
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| CN211957794U true CN211957794U (en) | 2020-11-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112830557A (en) * | 2021-01-06 | 2021-05-25 | 北京交通大学 | Electrochemical membrane filtering device based on titanium fiber composite electrode and water treatment method thereof |
| CN116565245A (en) * | 2023-07-11 | 2023-08-08 | 四川中科兴业高新材料有限公司 | Preparation method of bipolar plate based on PPS |
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2019
- 2019-12-11 CN CN201922212344.XU patent/CN211957794U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112830557A (en) * | 2021-01-06 | 2021-05-25 | 北京交通大学 | Electrochemical membrane filtering device based on titanium fiber composite electrode and water treatment method thereof |
| CN112830557B (en) * | 2021-01-06 | 2022-02-15 | 北京交通大学 | Electrochemical membrane filtering device based on titanium fiber composite electrode and water treatment method thereof |
| CN116565245A (en) * | 2023-07-11 | 2023-08-08 | 四川中科兴业高新材料有限公司 | Preparation method of bipolar plate based on PPS |
| CN116565245B (en) * | 2023-07-11 | 2023-09-12 | 四川中科兴业高新材料有限公司 | Preparation method of bipolar plate based on PPS |
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Legal Events
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Mei Hao Inventor after: Bi Feifei Inventor after: Jiang Tianhao Inventor after: Lan Shuhuai Inventor before: Mei Hao Inventor before: Bi Feifei Inventor before: Jiang Tianhao Inventor before: Lan Shuhuai Inventor before: Peng Linfa |
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| CB03 | Change of inventor or designer information | ||
| CP03 | Change of name, title or address |
Address after: 201306 factory building 1, No. 1500, cenglin Road, Lingang New District, pilot Free Trade Zone, Pudong New Area, Shanghai Patentee after: Shanghai Zhizhen new energy Co.,Ltd. Address before: 201306 factory building 1, no.1500, cenglin Road, Nicheng Town, Pudong New Area, Shanghai Patentee before: SHANGHAI ZHIZHEN NEW ENERGY EQUIPMENT CO.,LTD. |
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| CP03 | Change of name, title or address |