CN110983693A - Pretreatment method and device of carbon paper for gas diffusion layer of fuel cell - Google Patents
Pretreatment method and device of carbon paper for gas diffusion layer of fuel cell Download PDFInfo
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- CN110983693A CN110983693A CN201911338728.4A CN201911338728A CN110983693A CN 110983693 A CN110983693 A CN 110983693A CN 201911338728 A CN201911338728 A CN 201911338728A CN 110983693 A CN110983693 A CN 110983693A
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- carbon paper
- diffusion layer
- gas diffusion
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
- D06B5/00—Forcing liquids, gases or vapours through textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing impregnating
- D06B5/12—Forcing liquids, gases or vapours through textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing impregnating through materials of definite length
- D06B5/22—Forcing liquids, gases or vapours through textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing impregnating through materials of definite length through fabrics
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/88—Processes of manufacture
- H01M4/8803—Supports for the deposition of the catalytic active composition
- H01M4/8807—Gas diffusion layers
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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 invention relates to the technical field of fuel cells, and discloses a pretreatment method of carbon paper for a gas diffusion layer of a fuel cell, which is characterized by comprising the following steps of (1) impregnating the carbon paper by a hydrophobic solution; (2) and carrying out negative pressure suction filtration on one end of the carbon paper. Negative pressure suction filtration is carried out through the one end to carbon paper for hydrophobic solution can be continuous to permeate through from carbon paper, and the negative pressure can be taken out the gas in the carbon paper, makes hydrophobic material ability evenly distributed in carbon paper.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a method and a device for pretreating carbon paper for a gas diffusion layer of a fuel cell.
Background
The gas diffusion layer comprises carbon paper and a microporous layer coated on one side of the carbon paper, the carbon paper needs to be subjected to hydrophobic pretreatment before microporous slurry is coated on the carbon paper, and the conventional method for preparing and pretreating the carbon paper generally adopts a method of normal pressure impregnation to pretreat the carbon paper, but the method has the defect that when the carbon paper is treated by the normal pressure impregnation method, air existing in the carbon paper cannot be discharged, so that the method is difficult to realize the complete uniform distribution of hydrophobic materials.
Disclosure of Invention
The invention aims to overcome the technical defects, provides a method and a device for pretreating carbon paper for a gas diffusion layer of a fuel cell, and solves the technical problem that hydrophobic materials are unevenly distributed on the carbon paper in the prior art.
In order to achieve the technical purpose, the technical scheme of the invention provides a pretreatment method of carbon paper for a gas diffusion layer of a fuel cell, which is characterized by comprising the following steps:
(1) impregnating the carbon paper by a hydrophobic solution;
(2) and carrying out negative pressure suction filtration on one end of the carbon paper.
Compared with the prior art, the invention has the beneficial effects that: negative pressure suction filtration is carried out through the one end to carbon paper for hydrophobic solution can be continuous to permeate through from carbon paper, and the negative pressure can be taken out the gas in the carbon paper, makes hydrophobic material ability evenly distributed in carbon paper.
Drawings
FIG. 1 is a flow chart of the pretreatment of a carbon paper for a gas diffusion layer of a fuel cell according to the present invention;
FIG. 2 is a schematic view showing the construction of a pretreatment apparatus for a carbon paper for a gas diffusion layer of a fuel cell according to the present invention;
FIG. 3 is an enlarged partial schematic view at A in FIG. 2;
FIG. 4 is a three-dimensional schematic view of the clamp assembly 1 of the present invention;
FIG. 5 is a cross-sectional hydrophobic material distribution plot for a prior art carbon paper pretreated by atmospheric pressure impregnation;
fig. 6 is a cross-sectional hydrophobic material distribution plot for carbon paper treated using the pretreatment method described in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a pretreatment method of carbon paper for a gas diffusion layer of a fuel cell, which comprises the following steps as shown in figures 1 to 6:
(1) impregnating the carbon paper by a hydrophobic solution;
(2) and carrying out negative pressure suction filtration on one end of the carbon paper.
The invention also provides a device for pretreating carbon paper for a gas diffusion layer of a fuel cell, which is characterized by comprising the following components:
the clamp assembly is hollow inside;
the micropore plate is arranged in the clamp assembly, the cavity in the clamp assembly is divided into an upper first cavity and a lower second cavity, the micropore plate is provided with a plurality of first through holes, one end of each first through hole is communicated with the corresponding first cavity, and the other end of each first through hole is communicated with the corresponding second cavity;
and the negative pressure assembly comprises a suction pump, and the liquid inlet end of the suction pump is communicated with the second chamber.
For further understanding of the present invention, the following examples are given to illustrate specific processes for preparing the present invention.
The first embodiment is as follows:
a method for pretreating a carbon paper for a gas diffusion layer of a fuel cell, as shown in fig. 1, comprising the steps of:
(1) impregnating the carbon paper by a hydrophobic solution;
(2) carrying out negative pressure suction filtration on one end of the carbon paper;
(3) removing the residual hydrophobic solution on the surface of the carbon paper;
(4) drying and sintering the carbon paper;
(5) and (4) repeatedly treating the obtained carbon paper at least once according to the method from the step (1) to the step (4).
Preferably, the thickness of the carbon paper is 110-390 μm, and the porosity is 60-90%, and more preferably, the thickness of the carbon paper is 200 μm, and the porosity is 75%.
Preferably, the hydrophobic solution is a solution containing a hydrophobic material with a mass concentration of 0.1 wt% to 40 wt%, and the hydrophobic material includes one or more of PTFE, PDDA, PVDF, FEP, and ETFE.
Preferably, the impregnation time in the step (2) is 1s-120 s.
Preferably, the vacuum degree of the negative pressure suction filtration in the step (2) is 30kPa-60kPa, and the duration of the negative pressure suction filtration is 1s-20s, and further preferably, the vacuum degree is 45KPa, and the duration of the negative pressure suction filtration is 5 s.
Preferably, the method for removing the residual hydrophobic solution in the step (3) is one of vacuum filtration, filter paper wiping and nitrogen purging.
Preferably, the drying manner of the gas diffusion layer in the step (4) is one or more of hot air, infrared rays and microwaves, and the drying temperature of the gas diffusion layer in the step (4) is 30-120 ℃ and the drying time is 30-120 min.
Preferably, the sintering temperature of the gas diffusion layer in the step (4) is 200-380 ℃, the sintering time is 30-120 min, and the environment atmosphere used for sintering is one or a mixture of more than two of air atmosphere, oxygen atmosphere, nitrogen atmosphere and argon atmosphere.
Example two:
a method for pretreating a carbon paper for a gas diffusion layer of a fuel cell, as shown in fig. 1, comprising the steps of:
(1) 50g of 60% PTFE emulsion (Shanghai Hesen electric Co., Ltd.) and 250g of deionized water were weighed respectively and put into a beaker for ultrasonic dispersion for 30min, and the mixture obtained by the ultrasonic dispersion treatment was stirred at 8000rpm for 60min to obtain a hydrophobic solution, and a high-speed disperser (Germany IKA, T25 digital display type) was used for stirring at 8000rpm for 60 min.
(2) And completely soaking the hydrophobic solution on the surface of the carbon paper, continuously allowing the hydrophobic solution to penetrate through the gas diffusion layer through vacuum filtration, keeping the hydrophobic solution uninterrupted, wherein the filtration time is 5s, and at the moment, keeping the vacuum negative pressure at 60 kPa.
(4) Taking out the impregnated carbon paper, and carefully wiping off the residual hydrophobic solution on the surface by using filter paper;
(5) drying the carbon paper in an oven at 80 deg.C for 30 min;
(5) and (3) putting the dried carbon paper into an oven at 250 ℃ for 30min, heating to 350 ℃ at the speed of 2 ℃/s, and continuously keeping for 30min to obtain the carbon paper subjected to hydrophobic treatment, wherein the environment atmosphere used during heating is nitrogen atmosphere.
(6) And (5) repeatedly treating the carbon paper once according to the method from the step (1) to the step (5).
Example three:
a method for pretreating a carbon paper for a gas diffusion layer of a fuel cell, as shown in fig. 1, comprising the steps of:
(1) 50g of 60% PTFE emulsion (Shanghai Hesen electric Co., Ltd.) and 150g of deionized water were weighed respectively and placed in a beaker to be ultrasonically dispersed for 30min, and the mixture obtained by the ultrasonic dispersion treatment was stirred at 8000rpm for 60min to obtain a hydrophobic solution, and a high-speed dispersion machine (Germany IKA, T25 digital display type) was used for stirring.
(2) And completely soaking the hydrophobic solution on the surface of the carbon paper, continuously allowing the hydrophobic solution to penetrate through the gas diffusion layer through vacuum filtration, keeping the hydrophobic solution uninterrupted, wherein the filtration time is 5s, and at the moment, keeping the vacuum negative pressure at 60 kPa.
(3) Samples of the gas diffusion layer were taken and the surface residual hydrophobic solution carefully wiped off with filter paper
(4) The carbon paper is dried in an oven at 80 ℃ for 30 min.
(5) And (3) putting the dried carbon paper into an oven at 250 ℃ for 30min, heating to 350 ℃ at the speed of 2 ℃/s, and continuously keeping for 30min to obtain the carbon paper subjected to hydrophobic treatment, wherein the environment atmosphere used during heating is nitrogen atmosphere.
(6) And (5) repeatedly treating the carbon paper once according to the method from the step (1) to the step (5).
Example three:
as shown in fig. 2 to 4, the present invention further provides an apparatus for pretreating carbon paper for a gas diffusion layer of a fuel cell, which is characterized by comprising a fixture assembly 1, a microporous plate 2, a negative pressure assembly 3, a liquid storage tank 4, and a circulation assembly 5, wherein the interior of the fixture assembly 1 is hollow; the clamp assembly 1 comprises a lower die 11 and an upper die 12, wherein the lower die 11 is hollow and is provided with an opening at one end, the upper die 12 is hollow and is provided with an opening at one end, the opening end of the upper die 12 is connected to the opening end of the lower die 11 in a sealing manner, and the lower die 11 and the upper die 12 are surrounded to form a cavity.
Preferably, the up end of lower mould 11 is inwards sunken to be formed with four screw holes, a fixed slot, the fixed slot is relative with the coaxial setting of lower mould 11, goes up mould 12 and has seted up four fixed orificess, the fixed orifices with the screw hole one-to-one sets up, and anchor clamps subassembly 1 still includes four screws 13, sealing washer 14, screws 13 with the screw hole one-to-one sets up, screws 13 pass corresponding fixed orifices and threaded connection in the screw hole, sealing washer 14 cooperation is inlayed and is located the fixed slot, and sealing washer 14 butt in last mould 12.
The clamp assembly 1 is arranged in the micropore plate 2, the cavity inside the clamp assembly 1 is divided into a first cavity above the micropore plate and a second cavity below the micropore plate, the micropore plate 2 is provided with a plurality of first through holes, one ends of the first through holes are communicated with the first cavity, and the other ends of the first through holes are communicated with the second cavity.
Preferably, the micro via plate 2 is embedded in the lower mold 11 and connected to an inner wall of the lower mold 11, and the plurality of first through holes are located in a square area.
The negative pressure component 3 comprises a suction pump 31, a liquid inlet end of the suction pump 31 is communicated with the second chamber, preferably, the negative pressure component 3 further comprises a first liquid inlet pipeline 32 and a first liquid outlet pipeline 33, one end of the first liquid inlet pipeline 32 is communicated with the liquid inlet end of the suction pump 31, the other end of the first liquid inlet pipeline is communicated with the lower die 11, and the communication position is located at the bottom of the lower die 11; one end of the first liquid outlet pipe 33 is communicated with the liquid outlet end of the suction pump 31.
Preferably, the suction pump 31 is a centrifugal pump.
The liquid storage tank 4 is communicated with the liquid outlet end of the suction pump 31, preferably, the liquid storage tank 4 is communicated with the other end of the first liquid outlet pipeline 33.
The circulating component 5 comprises a circulating pump 51, and the liquid inlet end of the circulating pump 51 is communicated with the liquid storage tank 4 and the liquid outlet end is communicated with the upper die 12.
Preferably, the circulation component 5 further comprises a second liquid inlet pipeline 52 and a second liquid outlet pipeline 53, wherein one end of the second liquid inlet pipeline 52 is communicated with the liquid inlet end of the circulation pump 51, and the other end of the second liquid inlet pipeline is communicated with the liquid storage tank 4; one end of the second liquid outlet pipeline 53 is communicated with the liquid outlet end of the circulating pump 51, the other end is communicated with the upper die 12, and the communication position is arranged close to the top of the upper die 12.
The specific working process of the invention is as follows: the upper die 12 is taken down, the carbon paper is placed on the microporous plate 2, the square area is completely covered by the carbon paper, and shields all the first through holes, the upper die 12 is hermetically connected to the lower die 11 by the screws 13, the suction pump 31 is started, under the action of the negative pressure of the suction pump 31, the hydrophobic solution above the carbon paper continuously passes through the carbon paper in a penetrating manner, then enters the liquid storage tank 4 through the first liquid inlet pipeline 32, the suction pump 31 and the first liquid outlet pipeline 33, the circulating pump 51 is started, the hydrophobic solution in the liquid storage tank 4 is continuously pumped into the upper die 12 by the circulating pump 51, so that the hydrophobic solution in the upper mold 12 is always immersed in the carbon paper, and after the continuous circulating pump 51 and the suction pump 31 continuously work for a period of time, and taking out the carbon paper, carefully wiping off the residual hydrophobic solution on the surface of the next carbon paper by using filter paper, putting the carbon paper into an oven for drying, and putting the dried carbon paper into the oven for sintering treatment.
According to the invention, the microporous plate 2 is arranged to separate the upper die 12 from the lower die 11, one end of the microporous plate 2 is sucked by the suction pump 31 to enable the hydrophobic solution to continuously pass through the carbon paper in a penetrating manner, and gas in the carbon paper is sucked out under the negative pressure of the suction pump 31, so that the hydrophobic material can be uniformly distributed in the carbon paper;
in fig. 5 and 6, the carbon paper is lighter in color and the carbon paper is darker in color, and it can be seen from comparison between fig. 5 and 6 that the distribution of the hydrophobic material in the carbon paper pretreated by the present invention is more uniform, while the distribution of the hydrophobic material in the carbon paper pretreated by the prior art is not uniform.
When the carbon paper is pretreated, the carbon paper does not need to be in a vacuum environment, the operation equipment is simpler, and the large-scale and continuous production is facilitated.
When the carbon paper is pretreated, the steps of dipping, sampling, drying, sintering and the like are not required to be completed in a vacuum environment, the requirements of continuous production can be met, and the preparation efficiency is effectively improved.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. A pretreatment method of carbon paper for a gas diffusion layer of a fuel cell is characterized by comprising the following steps:
(1) impregnating the carbon paper by a hydrophobic solution;
(2) and carrying out negative pressure suction filtration on one end of the carbon paper.
2. The method of pretreating a carbon paper for a gas diffusion layer of a fuel cell according to claim 1, further comprising the steps of:
(3) removing the residual hydrophobic solution on the surface of the carbon paper;
(4) and drying and sintering the carbon paper.
3. The method of pretreating a carbon paper for a gas diffusion layer of a fuel cell according to claim 2, further comprising the steps of:
(5) and (4) repeatedly treating the obtained carbon paper at least once according to the method from the step (1) to the step (4).
4. The pretreatment method of a carbon paper for a gas diffusion layer of a fuel cell according to any one of claims 1 to 3, further characterized by: the thickness of the carbon paper is 110-390 mu m, and the porosity is 60-90%.
5. The pretreatment method of a carbon paper for a gas diffusion layer of a fuel cell according to any one of claims 1 to 3, further characterized by: the hydrophobic solution is a solution containing a hydrophobic material with the mass concentration of 0.1 wt% -40 wt%, and the hydrophobic material comprises one or more than two of PTFE, PDDA, PVDF, FEP and ETFE.
6. The pretreatment method for a carbon paper for a gas diffusion layer of a fuel cell according to any one of claims 1 to 3, wherein the degree of vacuum of the negative pressure suction filtration in the step (2) is 30kPa to 60kPa, and the duration of the negative pressure suction filtration is 1s to 20 s.
7. An apparatus for pretreating a carbon paper for a gas diffusion layer of a fuel cell, comprising:
a clamp assembly having a hollow interior;
the micropore plate is arranged in the clamp assembly, the cavity in the clamp assembly is divided into an upper first cavity and a lower second cavity, the micropore plate is provided with a plurality of first through holes, one end of each first through hole is communicated with the corresponding first cavity, and the other end of each first through hole is communicated with the corresponding second cavity;
and the negative pressure assembly comprises a suction pump, and the liquid inlet end of the suction pump is communicated with the second chamber.
8. The apparatus for pretreating carbon paper for a gas diffusion layer of a fuel cell according to claim 7, wherein the jig assembly comprises a lower mold and an upper mold, the lower mold is hollow inside and open at one end, the upper mold is hollow inside and open at one end, and the open end of the upper mold is hermetically connected to the open end of the lower mold; the micropore plate is arranged in the lower die and connected to the inner wall of the lower die; the suction pump is communicated with the lower die.
9. The apparatus for pretreating carbon paper for a gas diffusion layer of a fuel cell according to claim 8, further comprising a liquid storage tank and a circulating assembly, wherein the liquid storage tank is communicated with the liquid outlet end of the suction pump; the circulating assembly comprises a circulating pump, and the liquid inlet end of the circulating pump is communicated with the liquid storage tank, and the liquid outlet end of the circulating pump is communicated with the upper die.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113113617A (en) * | 2021-06-11 | 2021-07-13 | 武汉氢能与燃料电池产业技术研究院有限公司 | Membrane electrode, fuel cell gas diffusion layer and preparation method thereof |
| CN114256469A (en) * | 2021-12-10 | 2022-03-29 | 国家电投集团氢能科技发展有限公司 | Gas diffusion layer for fuel cell, preparation method thereof and fuel cell |
| CN116995251A (en) * | 2023-09-26 | 2023-11-03 | 河南豫氢动力有限公司 | High-performance gas diffusion layer for fuel cell and preparation method thereof |
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| CN113113617A (en) * | 2021-06-11 | 2021-07-13 | 武汉氢能与燃料电池产业技术研究院有限公司 | Membrane electrode, fuel cell gas diffusion layer and preparation method thereof |
| CN114256469A (en) * | 2021-12-10 | 2022-03-29 | 国家电投集团氢能科技发展有限公司 | Gas diffusion layer for fuel cell, preparation method thereof and fuel cell |
| CN116995251A (en) * | 2023-09-26 | 2023-11-03 | 河南豫氢动力有限公司 | High-performance gas diffusion layer for fuel cell and preparation method thereof |
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Inventor after: Cheng Feng Inventor before: Xiao Feihu Inventor before: Xia Fengjie Inventor before: Cheng Feng Inventor before: Fang Xiaoxi Inventor before: Li Ke |