CN102088098B - A kind of preparation method of membrane electrode support layer of fuel cell - Google Patents
A kind of preparation method of membrane electrode support layer of fuel cell Download PDFInfo
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- CN102088098B CN102088098B CN201110003822.1A CN201110003822A CN102088098B CN 102088098 B CN102088098 B CN 102088098B CN 201110003822 A CN201110003822 A CN 201110003822A CN 102088098 B CN102088098 B CN 102088098B
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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
A preparation method for the membrane electrode support layer of fuel cell, belongs to fuel cell membrane electrode preparation field, and method is, is immersed by carbon paper in the PVDF-HFP solution of NMP dissolving, takes out after dipping certain hour; Carbon paper after above-mentioned dipping is immersed in deionized water again, NMP is wherein extracted; Then gained carbon paper is dry; Gained carbon paper is sintered, obtains required supporting layer; The advantage of supporting layer of the present invention is: carbon paper surface hole is few, hydrophobicity is weak, and relative water-retaining property strengthens, good with microporous layers slurry compatibility, greatly can reduce the thickness that microporous layers is coated with at every turn, improve the performance of diffusion layer.
Description
Technical field
The present invention relates to a kind of preparation of fuel cell membrane electrode supporting layer, belong to fuel cell membrane electrode preparing technical field.
Background technology
The membrane electrode of fuel cell is primarily of gas diffusion layers, Catalytic Layer and proton exchange membrane composition, and membrane electrode is the core texture of fuel cell.Gas diffusion layers is generally made up of two-layer: supporting layer (hydrophobic layer) and microporous layers.
The preparation of traditional support layer mainly uses the PTFE solution impregnation carbon paper of 10%, and without extraction process, sintering temperature is higher, needs 340 DEG C; The microporous layers slurry prepared mainly is coated on the supporting layer that above-mentioned hydrophobic treatment crosses by the preparation of microporous layers, reaches certain thickness post-drying and weighs.Cause carbon paper pore-size distribution uneven because sintering temperature is high, hydrophobic water-retaining property is unbalanced, poor with microporous layers slurry compatibility, and microporous layers coating thickness is large, and the performance of diffusion layer is bad.
Summary of the invention
The technical problem to be solved in the present invention there is provided new solution impregnation system, and gained carbon paper sintering temperature is low, and supporting layer performance is good.
In order to solve the problems of the technologies described above, the invention provides following technical scheme:
A preparation method for the membrane electrode support layer of fuel cell, comprises the steps,
(1) preparation of carbon paper;
(2) carbon paper of step (1) is immersed in the PVDF-HFP solution of NMP dissolving, take out after dipping certain hour; Carbon paper after above-mentioned dipping is immersed in deionized water again, NMP is wherein extracted; Then gained carbon paper is dry, calculate carrying capacity after weighing; Preferably, the concentration of the PVDF-HFP solution of NMP dissolving is 15-30g/ml; The time that carbon paper is immersed in the PVDF-HFP solution of NMP dissolving is 0.5-2 minute; The temperature of carbon paper drying is 20-40 DEG C.
If carrying capacity meets the requirements, preparation manipulation directly enters step (4); Otherwise, enter step (3);
(3) repeatedly carbon paper is processed according to the method for step (2), until carbon paper reaches required carrying capacity;
(4) gained carbon paper is sintered, obtain required supporting layer; Preferably, the temperature of carbon paper sintering is 90-120 DEG C.
The advantage of supporting layer of the present invention is:
1, shown in Fig. 1, when PVDF-HFP, PTFE carrying capacity is identical, the carbon paper surface carrying PVDF-HFP is fewer than the carbon paper surface hole carrying PTFE, this is because PVDF-HFP sintering temperature is lower than PTFE (use the PTFE solution impregnation carbon paper of 10%, without extraction process, sintering temperature is higher, is 340 DEG C; And use preparation method of the present invention, sintering temperature is only 90-120 DEG C);
2, shown in table 1, along with the increase of PVDF-HFP carrying capacity, the hydrophobicity of carbon paper surface strengthens, but the hydrophobicity of the carbon paper surface of more identical carrying capacity PTFE is weak, relative water-retaining property strengthens (the stockless water droplet test result be shown in Table 1, test room temperature 20.6 DEG C, humidity 22%), good with microporous layers slurry compatibility (result that hydrophobicity reduces), greatly can reduce the thickness (finding in experimentation) that microporous layers is coated with at every turn, improve the performance of diffusion layer.
The relation contrast table of table 1 hydrophobic layer and contact angle.
| Hydrophobic layer | Contact angle/° |
| Undressed carbon paper surface | 61.3° |
| Carry the carbon paper that PVDF-HFP amount is 10% | 116.7 ° |
| Carry the carbon paper that PVDF-HFP amount is 15% | 120.7 ° |
| Carry the carbon paper that PVDF-HFP amount is 20% | 125.2 ° |
| Carry the carbon paper that PTFE amount is 20% | 137.1 ° |
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the inventive method gained carbon paper and untreated carbon paper, the contrast SEM of PTFE carbon paper schemes; Wherein, 1a is the carbon paper surface not doing any process; 1b is the carbon paper surface of the PVDF-HFP solution of the inventive method dipping 10%; 1c is the carbon paper surface of the PTFE solution of dipping 10%;
Fig. 2 is the sign schematic diagram of the stockless water droplet method that the inventive method is taked.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
embodiment 1
The preparation of the membrane electrode support layer of fuel cell, method is:
(1) carbon paper is cut into 5*5cm
2put into the beaker of 250ml and add deionized water and make it not have carbon paper, supersonic cleaning machine supersound washing 30min put into by whole beaker, takes out beaker, outwells deionized water, the air dry oven beaker that cleaned carbon paper is housed being put into 60 DEG C is dried, take out, electronic balance is weighed, record registration, weighed carbon paper is put into valve bag respectively, labelled stand-by.
(2) a certain amount of PVDF-HFP(Shanghai Sanaifu New Material Co., Ltd is taken, product grade FE2601, density 1.82 ± 0.02g/cm
3mooney viscosity 45 ± 15ML (1+10) 1) be dissolved in the solution being made into 15-30g/ml in 1-METHYLPYRROLIDONE (NMP), solution is poured in the culture dish of 65*15mm, carbon paper tweezers in step (1) are taken out, immerse 1min in culture dish solution, take out with tweezers and wipe the unnecessary solution of carbon paper surface gently off with glass bar, carbon paper is put into deionized water and floods 1min, extract NMP, then the air dry oven only putting into 30 DEG C containing the carbon paper of PVDF-HFP is dried.
Suppose that the carbon paper weight claimed in step 1 is a, flooding the carbon paper weight after PVDF-HFP in step 2 is b, and the account form of carrying capacity is (b-a)/b; So the consumption of PVDF-HFP will be determined according to the carrying capacity that the consumption of carbon paper and carbon paper need in step (2).
(3) weigh the carbon paper weight of drying in step 2, calculate the carrying capacity of PVDF-HFP on carbon paper according to the method described above, if carrying capacity does not reach the value of needs, then repeated impregnations-extraction-drying operation, until reach required carrying capacity.
(4) by gained carbon paper in air dry oven, 110 DEG C of sintering 1h, naturally cool, weigh, record.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. a preparation method for the membrane electrode support layer of fuel cell, is characterized in that: comprise the steps,
(1) preparation of carbon paper;
(2) carbon paper of step (1) is immersed in the PVDF-HFP solution of NMP dissolving, take out after dipping certain hour; Carbon paper after above-mentioned dipping is immersed in deionized water again, NMP is wherein extracted; Then gained carbon paper is dry, calculate the carrying capacity of PVDF-HFP on carbon paper after weighing;
If carrying capacity meets the requirements, preparation manipulation directly enters step (4); Otherwise, enter step (3);
(3) repeatedly carbon paper is processed according to the method for step (2), until carbon paper reaches required carrying capacity;
(4) by gained carbon paper at 90-120 DEG C of sintering, obtain required supporting layer;
Step (2), the concentration of the PVDF-HFP solution that NMP dissolves is 15-30g/ml; The temperature of carbon paper drying is 20-40 DEG C.
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| CN108321414A (en) * | 2018-03-09 | 2018-07-24 | 黄河科技学院 | A kind of hydrophobic processing method of fuel cell supporting layer |
| CN112310413B (en) * | 2019-07-24 | 2022-03-08 | 中国科学院苏州纳米技术与纳米仿生研究所 | Gas diffusion layer, preparation method and application thereof |
| CN111082110A (en) * | 2019-12-27 | 2020-04-28 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Method and equipment for manufacturing membrane electrode of fuel cell |
| CN113517447B (en) * | 2021-07-14 | 2022-06-21 | 辽宁分子流科技有限公司 | Preparation method of fuel cell membrane electrode |
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| CN101022164A (en) * | 2007-01-19 | 2007-08-22 | 南京大学 | Method for producing fuel battery gas diffusion layer |
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| CN101162773A (en) * | 2006-10-13 | 2008-04-16 | 比亚迪股份有限公司 | Preparation method of battery positive plate, positive plate and lithium ionic cell |
| KR100995417B1 (en) * | 2008-08-14 | 2010-11-18 | 삼성에스디아이 주식회사 | Secondary Battery |
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| CN101022164A (en) * | 2007-01-19 | 2007-08-22 | 南京大学 | Method for producing fuel battery gas diffusion layer |
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