CN102110822B - Gas diffusion layer and preparation method and application thereof - Google Patents
Gas diffusion layer and preparation method and application thereof Download PDFInfo
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- CN102110822B CN102110822B CN200910259752.9A CN200910259752A CN102110822B CN 102110822 B CN102110822 B CN 102110822B CN 200910259752 A CN200910259752 A CN 200910259752A CN 102110822 B CN102110822 B CN 102110822B
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Classifications
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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 discloses a gas diffusion layer and a preparation method and application thereof. The gas diffusion layer comprises a carbon black layer (2) with the micropore diameter of 30 to 100 microns and/or a carbon fiber layer (1) with the micropore diameter of 50 to 150 microns. The gas diffusion layer can be widely applied to gas diffusion electrodes in fuel cells, electrolytic cells and ultracapacitor electrochemical reaction devices. The invention simultaneously discloses a preparation method of the gas diffusion layer. The gas diffusion layer has a simple, rational and compact structure, overcomes various defects of the prior art, and has the advantages of high air permeability, high drainage, high conductivity, stable catalyst layers and high catalyst utilization rate.
Description
Technical field
The present invention relates to electrochemical reaction appts, particularly, relate to a kind of gas diffusion layers and its production and use.
Background technology
The electrode of fuel cell, electrolytic cell, super capacitor is a kind of gas-diffusion electrode of porous, is generally made up of diffusion layer and catalyst layer.Different diffusion layer materials has a great impact for the structure of electrode, manufacture craft and performance.
Such as in Proton Exchange Membrane Fuel Cells, fuel gas arrives catalyst layer through anode diffusion layer, under the effect of catalyst, electrode reaction occurs, namely
H
2-2H+2e
The electronics that this electrode reaction produces arrives negative electrode by the conduction flow of diffusion layer through external circuit, and hydrogen ion arrives negative electrode under the effect of proton exchange membrane simultaneously.Oxygen generates water by there is electrode reaction with hydrogen ion and electronics under catalyst action after cathode diffusion layer, that is:
1/2O
2+2H+2e-H
2O
Water in Proton Exchange Membrane Fuel Cells (PEMFC) is with gaseous state and liquid existence (depending on the temperature and pressure of battery) (Ersoz A, Olgun H, Ozdogan S.et al., J.Power Sources.2003,118 (1-2): 384-392), dilutional hyponatremia or the very few performance to PEMFC all can bring negative effect (Huang Naike, Wang Shuzhong, power technology, 2003,27 (3): 329-332).
Gas diffusion layers not only plays a part support catalyst layer, stabilized electrodes structure in the electrodes, also possesses for electrode reaction provides the several functions of gas passage, electron channel and drainage channel.High performance gas diffusion layer material is selected to be conducive to improving the combination property (JAMESL, ANDREW D.Fuel cell systems explained.England:John Wiley & Sons Ltd., 2000.66-69) of electrode.Desirable diffusion layer should possess 3 features: good gas permeability, good drainage and good conductivity.General gas diffusion layers is made up of base material and transition zone.In multiple base material, Carbon fibe paper has uniform Porous laminate structure and excellent conductivity, chemical stability and thermal stability, the diffusion layer material (Thomas T O, Glendale, the HiroshiI that are most widely used in fuel cell, et al., US:3829327,1974. and Teruaki Kitago, Tadaaki Yoshida, US:3998689,1976).Transition zone is also referred to as intermediate layer (Shao Zhigang, clothing treasured is honest and clean, Han Ming etc., electrochemistry, 2000,6 (3): 317-323.), reacting gas and the reallocation of product between flow field and Catalytic Layer is achieved adding of it, for enhancing conductivity, improve electrode performance, battery operation stability and service life and serve important function.
The people such as L.R.Jordan (JORDAN L R, SHUKLA A K, BEHRSING T, et al., J.Power Sources, 2000,86:250-254.) powdered carbon is mixed with polytetrafluoroethylene (PTFE) emulsion, add appropriate solvent, utilize ultrasonic wave to make it be uniformly dispersed, it is sprayed on equably the positive and negative surface of base material, after oven dry, at 300 ~ 350 DEG C, sinters about 30min, make PTFE melting remove surfactant simultaneously, finally obtain the hydrophobic material by PTFE bonding charcoal and basilar fibers.The powdered carbon added plays the effect strengthening conductivity on the one hand, is used on the other hand filling the macropore in base material between fiber, makes surfacing and even aperture distribution.In coating solution, the mass ratio of PTFE and carbon black is good between 20: 80 and 50: 50, and coating layer thickness is between 0.010 ~ 0.254mm, and the content of PTFE is 10% ~ 50%.
In the research of PEMFC diffusion layer, the people such as Xu Hongfeng, Tian Ying are coated with the mixture of one deck XC-72R charcoal and polytetrafluoroethylene (PTFE) as regulating course on the carbon paper crossed through hydrophobic treatment.Shao Zhigang, clothing precious honest and clean etc. (Shao Zhigang, clothing treasured is honest and clean, Han Ming etc., electrochemistry, 2000,6 (3): 317-323). using water or ethanol as solvent, carbon black and PTFE are made into the solution that mass ratio is 1: 1, after mixing, are used as regulating course.The people (LIM C.WANG C Y., Electrochimica Acta, 2004,49 (24): 4149-4156.) such as Chan Lim have studied the impact of PTFE content and thickness of diffusion layer.The people such as Giorgi (JORDAN L R, SHUKLA A K, BEHRSING T., Journal of PowerSources.2000.86:250-254.) think that increasing PTFE content in diffusion layer have impact on the porosity of diffusion layer.The people such as L.R.Jordan (KONG C S, KIM D Y, LEE H K, et al., Journal of Power Sources, 2002,108:185-191.) think that the oarse-grained acetylene black of use replaces Vulcan XC 72R charcoal can improve the performance of battery.The people such as Chang Sun Kong add pore creating material to improve the mass transfer problem in battery in PEMFC diffusion layer.
M.Watanabe (the WAT ANABE M. of Japan, US:5137754,1992.) etc. human hair understand a kind of new hydrophobic processing method, by mean molecule quantity be 250000 polyethylene be dissolved in heptane, be made into a kind of film forming solution, by base material, as Carbon fibe paper is immersed, on carbon paper, the PE coating that mass fraction is 5% is formed after heptane volatilization, then this carbon paper with polyethylene coating is put into stainless steel reactor, room temperature condition, containing the fluorine gas atmosphere of 10% argon gas in fluoridize about 30min, obtain the hydrophobic material of excellent performance.Compare by experiment and find that the hydrophobicity performance of the hydrophobic material obtained by the method for this hydrophobic processing method ratio PTFE emulsion dipping is better.
After charcoal/PTFE coating is done to base material, find that aperture does not wherein have hydrophobicity, because large 10 ~ 100 times of those apertures of PTFE molecular proportion.Thus the phenomenon of osmosis of noble metal can be found when spraying noble metal catalyst, cause the reduction of catalyst utilization, therefore need do hydrophobic process further to those apertures.V.K.KARL (KARL V K., US:3899354,1975.) uses the benzinum weak solution process of 1.5% paraffin wax to the carbon paper after coating, then dries 30min at 50 DEG C, and the aperture in coating can be made to possess effective hydrophobicity.Or use the acetone soln process of 2.0% cellulose acetate, also can obtain good aperture hydrophobic effect.
The another kind of hydrophobic processing method invented by research institute of Japanese Toyota is exposed to by base material a kind of in plasma treated charcoal fluorine compound gas, makes surface deposition one deck hydrophobic material.But this method need design main equipment especially, is not suitable for large-scale production.
In order to simplify production technology, and make the aperture in base material also obtain hydrophobicity, (the Gu Jun such as Gu Jun, Yu Tao etc., ZL200710019376.7) be made into dispersion liquid with carbon black powders and PTFE or PVDF, then base material be placed in dispersion liquid and carry out the good gas diffusion layers of dipping acquisition.
Although above technical process makes substrate material surface become smooth, catalyst can not be avoided completely to penetrate in base material, due to aperture or too large, otherwise too little, cause the moisture that reacting gas diffusional resistance increases or reaction generates to be difficult to discharge.
Summary of the invention
The object of the invention is to, for the problems referred to above, propose a kind of gas diffusion layers and its production and use, to realize the advantage that gas permeability is good, drainage is good, conductivity is good, catalyst layer is stablized, catalyst utilization is high.
For achieving the above object, the technical solution used in the present invention is:
A kind of gas diffusion layers, comprising: micro-pore diameter is the carbon black layer 2 of 30-100 micron and/or micro-pore diameter is 50-150 micron carbon fiber layer 1.
Simultaneously, another technical scheme that the present invention adopts is: a kind of application of gas diffusion layers, the gas-diffusion electrode in fuel cell, electrolytic cell, super capacitor electrochemical reaction appts can be widely used in, described electrode comprises: dielectric film 3, catalyst layer 4, gas diffusion layers 5, pole plate 6, and what dielectric film 3 both sides order was symmetrical is provided with catalyst layer 4, gas diffusion layers 5 and pole plate 6.
Meanwhile, another technical scheme that the present invention adopts is: a kind of preparation method of gas diffusion layers, and its preparation process is as follows:
1) carbon fibre material, dispersant and deionized water are configured to uniform sizing material, wherein the consumption of each component is: carbon fibre material is the 5-30wt% of slurry, and dispersant is the 5-30wt% of carbon fibre material; Add PTFE emulsion in the slurry, stir 0.5-2 hour, wherein the consumption of PTFE emulsion is the 10-50wt% of carbon fibre material; Then add viscosity modifier, the viscosity of slurry is adjusted to 1000-30000cps, namely obtains carbon fiber slurry;
2) mixture of carbon black powders or carbon black powders and carbon fiber, deionized water, dispersant are configured to uniform sizing material, wherein the consumption of each component is: the mixture of carbon black powders or carbon black powders and carbon fiber is the 10-20wt% of slurry, dispersant is the 5-30wt% of carbon fibre material, add PTFE emulsion in the slurry, stir 0.5-2 hour, wherein the consumption of PTFE emulsion is the 10-50wt% of the mixture of carbon black powders or carbon black powders and carbon fiber; Then add viscosity modifier, the viscosity of slurry is adjusted to 1000-30000cps, namely obtain carbon black slurry;
3) described diffusion layer substrates is put into PTFE emulsion and flood 0.5-15min, taking-up is dried, and puts into drying box 50-150 DEG C of oven dry, at 300-390 DEG C of sintering 20-60min, obtains the diffusion layer substrates being loaded with PTFE;
4) utilize silk screen printing, coating, spraying method respectively or successively carbon fiber slurry and carbon black slurry are coated to the diffusion layer substrates being loaded with PTFE, then at 300-390 DEG C, sinter 20-60min, obtain described gas diffusion layers.
Further, described dispersant is one or more in XH-1, AEO-9, FC4430, Tween-60, Triton X-100.
Further, described diffusion layer substrates is the one in carbon paper, carbon cloth (model is: TORY, SGL, GORE), stainless (steel) wire, nickel screen, copper mesh.
Further, described carbon black powders is that acetylene black is or/and active carbon.
Further, the PTFE emulsion of described PTFE emulsion to be content be 10-50wt%.
Further, described viscosity modifier is one or more in polyethylene glycol, ethylene glycol, glycerine, cellulose.
Beneficial effect:
The invention discloses a kind of diffusion layer for electrochemical reaction appts such as fuel cell, electrolytic cell, super capacitors and preparation technology thereof, micropore is more even in electrode surface distribution, in the cross-sectional direction of electrode, there is bore diameter gradient, make diffuse layer structure more stable, and be conducive to the diffusion of reacting gas and the discharge of moisture, avoid the catalyst material of catalyst layer penetrate into the larger diffusion layer in aperture and reduce catalyst utilization simultaneously.
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 generalized section of traditional gas diffusion electrode;
Fig. 2 is the gas-diffusion electrode generalized section of the present invention with carbon fiber layer;
Fig. 3 is the gas-diffusion electrode generalized section of the present invention with carbon black layer;
Fig. 4 is the gas-diffusion electrode generalized section of the present invention simultaneously with carbon fiber layer and carbon black layer.
By reference to the accompanying drawings, in the embodiment of the present invention, Reference numeral is as follows:
1-carbon fiber layer; 2-carbon black layer; 3-dielectric film; 4-catalyst layer; 5-gas diffusion layers; 6-pole plate.
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.
Fig. 1 is the generalized section of gas-diffusion electrode in the electrochemical reaction appts such as conventional fuel cell, electrolytic cell, super capacitor.The primary effect of diffusion layer substrate 5 is to electrode interior input reaction medium or to electrode exterior output medium, and the electric current that collection or conducting electrochemical reaction produce or need.Basalis 5 must be the material of electrochemical corrosion resistant and high connductivity, mainly carbon fiber paper, carbon cloth or through antiseptic wire netting as nickel screen, copper mesh, stainless (steel) wire etc.The porosity of basalis 5 is generally 50-90%, and aperture is 100-200 micron.Catalyst layer 4 is generally Pt and alloy catalyst thereof in a fuel cell, and be the region that electrochemical redox reaction occurs, the particle diameter of catalyst and carrier thereof is generally 3-50 micron.Due to the gas diffusion layers that the catalyst layer next-door neighbour aperture that particle diameter is less is larger, catalyst easily penetrates into the macropore of basalis, causes the loss of catalyst, reduces the activity of electrochemical reaction.
Fig. 2 is the gas-diffusion electrode generalized section of the present invention with carbon fiber layer.And Fig. 1 adds carbon fiber layer 1 unlike between basalis 5 and catalyst layer 4.Carbon fiber layer 1 is mainly made up of carbon fiber and high polymer binder, forms the micropore that diameter is 50-150 micron.The aperture of carbon fiber layer 1 is more smaller than the aperture of basalis, can not affect the transmission of reaction medium in diffusion layer, and the catalyst in catalyst layer can be stoped to penetrate into the larger basalis in aperture.
Fig. 3 is the gas-diffusion electrode generalized section of the present invention with carbon black layer, and Fig. 2 is similar, just between basalis 5 and catalyst layer 4, adds carbon black layer 2.Carbon black layer 2 is mainly made up of carbon black powders (acetylene black, activated carbon etc.) and high polymer binder, or the entering part carbon fiber that adulterates again wherein, with obtain high connductivity, there is the microporous layers of aperture for 30-100 micron.Effectively can stop the loss of catalyst like this, but be unfavorable for the discharge of moisture and the transmission of reaction medium in electrode.
Fig. 4 is the gas-diffusion electrode generalized section of the present invention simultaneously with carbon fiber layer and carbon black layer.And Fig. 2 and 3 adds carbon black layer 2 unlike between carbon black layer 2 and catalyst layer 4.Aperture is the loss that the carbon black layer 2 of 30-100 micron effectively prevents catalyst in catalyst layer 4.Reaction medium arrives catalyst layer 4 from basalis 5 by carbon fiber layer 1, carbon black layer 2, and aperture reduces gradually, reduces the diffusional resistance of reaction medium, and can guarantee the discharge of moisture in electrode.
This gas diffusion layers, comprising: micro-pore diameter is the carbon black layer 2 of 30-100 micron and/or micro-pore diameter is 50-150 micron carbon fiber layer 1.
Simultaneously, another technical scheme that the present invention adopts is: a kind of application of gas diffusion layers, the gas-diffusion electrode in fuel cell, electrolytic cell, super capacitor electrochemical reaction appts can be widely used in, described electrode comprises: dielectric film 3, catalyst layer 4, gas diffusion layers 5, pole plate 6, and what dielectric film 3 both sides order was symmetrical is provided with catalyst layer 4, gas diffusion layers 5 and pole plate 6.
Meanwhile, another technical scheme that the present invention adopts is: a kind of preparation method of gas diffusion layers, and its preparation process is as follows:
1) carbon fibre material, dispersant and deionized water are configured to uniform sizing material, wherein the consumption of each component is: carbon fibre material is the 5-30wt% of slurry, and dispersant is the 5-30wt% of carbon fibre material; Add PTFE emulsion in the slurry, stir 0.5-2 hour, wherein the consumption of PTFE emulsion is the 1050wt% of carbon fibre material; Then add viscosity modifier, the viscosity of slurry is adjusted to 1000-30000cps, namely obtains carbon fiber slurry;
2) mixture of carbon black powders or carbon black powders and carbon fiber, deionized water, dispersant are configured to uniform sizing material, wherein the consumption of each component is: the mixture of carbon black powders or carbon black powders and carbon fiber is the 10-20wt% of slurry, dispersant is the 5-30wt% of carbon fibre material, add PTFE emulsion in the slurry, stir 0.5-2 hour, wherein the consumption of PTFE emulsion is the 1050wt% of the mixture of carbon black powders or carbon black powders and carbon fiber; Then add viscosity modifier, the viscosity of slurry is adjusted to 1000-30000cps, namely obtain carbon black slurry;
3) described diffusion layer substrates is put into PTFE emulsion and flood 0.5-15min, taking-up is dried, and puts into drying box 50-150 DEG C of oven dry, at 300-390 DEG C of sintering 20-60min, obtains the diffusion layer substrates being loaded with PTFE;
4) utilize silk screen printing, coating, spraying method respectively or successively carbon fiber slurry and carbon black slurry are coated to the diffusion layer substrates being loaded with PTFE, then at 300-390 DEG C, sinter 20-60min, obtain described gas diffusion layers.
Described dispersant is one or more in XH-1, AEO-9, FC4430, Tween-60, Triton X-100.Described carbon back is carbon paper or carbon cloth, and model is: TORY, SGL, GORE.Described carbon black powders is that acetylene black is or/and active carbon.The PTFE emulsion of described PTFE emulsion to be content be 10-50wt%.Described viscosity modifier is one or more in polyethylene glycol, ethylene glycol, glycerine, cellulose.
embodiment 1
Take the PTFE emulsion 60.0080g of 60% in 250mL beaker, add 60-180g deionized water, magnetic stir bar stir about 15min, makes it be uniformly dispersed.The PTFE solution of 10-30% is poured in clean culture dish, the carbon paper cut out or carbon cloth (clean, dry, weigh) level are immersed in solution, then vacuum drying oven is put into, regulate vacuum degree to 200Pa, carbon paper is taken out after dipping 1min, blot the solution at carbon paper or carbon cloth edge with filter paper, then level is dried (about 6min).Again carbon paper or carbon cloth are put into high temperature oven, design temperature 70 DEG C, about 6min dries taking-up.Again carbon or carbon cloth paper are placed in 350 DEG C, baking oven sintering 30min, make the load capacity of PTFE be 1-10mg.cm
-2.
3.0g carbon fiber powder is taken with 50ml beaker.In 100ml beaker, add 9ml deionized water, add certain density dispersant wherein, as XH-1, AEO 9, FC4430, Tween-60, Triton X-100 etc.By the method for ultrasonic cell disruptor dispersion, carbon fiber powder is dispensed in above-mentioned deionized water.With 1ml distilled water flushing ultrasonic head, the solution of flushing flows in beaker.Above-mentioned beaker is put into high-power ultrasonics cleaning machine, ensures that water in tank is not to the half height of beaker, ultrasonic agitation 1 hour.Dropwise add the PTFE emulsion 0.5-1g of 60% in above-mentioned solution, continue stirring 0.5 hour.In ultra-high frequency ultrasonic wave cleaning, in the diffusion layer slurry that a certain amount of thickener is prepared as polyethylene glycol, glycerine etc. dropwise add, ultrasonic 20min, more a certain amount of isopropyl alcohol is added in above-mentioned slurry, finally obtain the diffusion layer slurry that viscosity is about 1000-30000cps.
The coating of this slurry or the method for silk screen printing are coated to the surface of above-mentioned treated carbon paper or carbon cloth, obtain carbon fiber layer 1 (as shown in Figure 2).The carbon fiber loaded amount of carbon fiber layer 1 is 0.5-2mgcm
-2, thickness is 10-30 micron.
embodiment 2
Take the PTFE emulsion 60.0080g of 60% in 250mL beaker, add 60-180g deionized water, magnetic stir bar stir about 15min, makes it be uniformly dispersed.The PTFE solution of 10-30% is poured in clean culture dish, the carbon paper cut out or carbon cloth (clean, dry, weigh) level are immersed in solution, then vacuum drying oven is put into, regulate vacuum degree to 200Pa, carbon paper is taken out after dipping 1min, blot the solution at carbon paper or carbon cloth edge with filter paper, then level is dried (about 6min).Again carbon paper or carbon cloth are put into high temperature oven, design temperature 70 DEG C, about 6min dries taking-up.Again carbon or carbon cloth paper are placed in 350 DEG C, baking oven sintering 30min, make the load capacity of PTFE be 1-10mg.cm
-2.
Take 3-20g acetylene black powder or other carbon black with 200ml beaker, add certain density dispersant wherein, as XH-1, AEO-9, FC4430, Tween-60, Triton X-100 etc., with glass rod, powder is stirred into dough.In 2500ml beaker, add the above-mentioned dispersant that 200-500ml concentration is 0.5-10%, then add a certain amount of distilled water.Use high-shear emulsion machine agitating solution, and every 2min, doughy carbon black is divided 10 times to add in above-mentioned beaker.After all adding, continue to shear 30min.Dropwise add the PTFE emulsion 0.5-1g of 60% in above-mentioned solution, continue stirring 0.5 hour.In ultra-high frequency ultrasonic wave cleaning, in the diffusion layer slurry that a certain amount of thickener is prepared as polyethylene glycol, glycerine etc. dropwise add, ultrasonic 20min, more a certain amount of isopropyl alcohol is added in above-mentioned slurry, finally obtain the diffusion layer slurry that viscosity is about 1000-30000cps.
The coating of this slurry or the method for silk screen printing are coated to the surface of above-mentioned treated carbon paper or carbon cloth, obtain carbon black layer 2 (as shown in Figure 3).Carbon black layer 2 load capacity is 0.5-2mgcm
-2, thickness is 10-30 micron.
embodiment 3
Prepare diffusion layer slurry according to the method for embodiment 1 and 2, successively the slurry of embodiment 2 and embodiment 1 is coated to the surface (as shown in Figure 4) of treated carbon paper or carbon cloth by the method for coating or silk screen printing.The gross thickness of carbon black layer 2 and carbon fiber layer 1 is 10-30 micron, and total carbon black and carbon fiber loaded amount are 0.5-2mgcm
-2.
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 (6)
1. the preparation method of a gas diffusion layers, described gas diffusion layers comprises: micro-pore diameter is the carbon black layer (2) of 30-100 micron and micro-pore diameter is 50-150 micron carbon fiber layer (1), the micropore size of described carbon black layer is less than the micropore size of carbon fiber layer, it is characterized in that, preparation process is as follows:
1) carbon fibre material, dispersant and deionized water are configured to uniform sizing material, wherein the consumption of each component is: carbon fibre material is the 5-30wt% of slurry, and dispersant is the 5-30wt% of carbon fibre material; Add PTFE emulsion in the slurry, stir 0.5-2 hour, wherein the consumption of PTFE emulsion is the 10-50wt% of carbon fibre material; Then add viscosity modifier, the viscosity of slurry is adjusted to 1000-30000cps, namely obtains carbon fiber slurry;
2) mixture of carbon black powders or carbon black powders and carbon fiber, deionized water, dispersant are configured to uniform sizing material, wherein the consumption of each component is: the mixture of carbon black powders or carbon black powders and carbon fiber is the 10-20wt% of slurry, dispersant is the 5-30wt% of carbon fibre material, add PTFE emulsion in the slurry, stir 0.5-2 hour, wherein the consumption of PTFE emulsion is the 10-50wt% of the mixture of carbon black powders or carbon black powders and carbon fiber; Then add viscosity modifier, the viscosity of slurry is adjusted to 1000-30000cps, namely obtain carbon black slurry;
3) diffusion layer substrates is put into PTFE emulsion and flood 0.5-15min, taking-up is dried, and puts into drying box 50-150 DEG C of oven dry, at 300-390 DEG C of sintering 20-60min, obtains the diffusion layer substrates being loaded with PTFE;
4) utilize silk screen printing, carbon fiber slurry and carbon black slurry be coated to and be loaded with on the diffusion layer substrates of PTFE by the method for coating successively, then at 300-390 DEG C, sinter 20-60min, obtain described gas diffusion layers.
2. the preparation method of gas diffusion layers according to claim 1, is characterized in that, described dispersant is one or more in XH-1, AE0-9, FC4430, Tween-60, Triton X-100.
3. the preparation method of gas diffusion layers according to claim 1, is characterized in that, described diffusion layer substrates is the one in carbon paper, carbon cloth, stainless (steel) wire, nickel screen, copper mesh.
4. the preparation method of gas diffusion layers according to claim 1, is characterized in that, described carbon black powders is that acetylene black is or/and active carbon.
5. the preparation method of gas diffusion layers according to claim 1, is characterized in that, the PTFE emulsion of described PTFE emulsion to be content be 10-50wt%.
6. the preparation method of gas diffusion layers according to claim 1, is characterized in that, described viscosity modifier is one or more in polyethylene glycol, ethylene glycol, glycerine, cellulose.
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| CN102517602B (en) * | 2011-12-29 | 2014-10-29 | 北京化工大学 | Gelatin hole forming method for gas diffusion electrodes |
| CN102632733A (en) * | 2012-04-18 | 2012-08-15 | 常州比太科技有限公司 | Method for forming silver line |
| CN103401003B (en) * | 2013-07-17 | 2016-08-17 | 南京大学昆山创新研究院 | Gas diffusion layers of Proton Exchange Membrane Fuel Cells and preparation method thereof |
| WO2017069014A1 (en) * | 2015-10-22 | 2017-04-27 | 東レ株式会社 | Carbon sheet, gas-diffusion-electrode substrate, roll body, and fuel cell |
| KR101755920B1 (en) * | 2015-12-08 | 2017-07-07 | 현대자동차주식회사 | Gas diffusion layer for fuel cell, device and method for manufacturing the same |
| WO2017110690A1 (en) * | 2015-12-24 | 2017-06-29 | 東レ株式会社 | Gas diffusion electrode |
| CN105932300B (en) * | 2016-05-30 | 2019-06-25 | 昆明纳太科技有限公司 | Gas-diffusion electrode and preparation method thereof |
| CN107342431A (en) * | 2017-03-06 | 2017-11-10 | 南京大学 | A kind of graphene-based gas-diffusion electrode of used in proton exchange membrane fuel cell and preparation method thereof |
| CN107403939A (en) * | 2017-09-12 | 2017-11-28 | 福建福安闽东亚南电机有限公司 | A kind of preparation method of fuel cell membrane electrode diffusion layer |
| CN107681164B (en) * | 2017-09-25 | 2018-10-16 | 深圳市南科燃料电池有限公司 | Gas diffusion layers and preparation method thereof and fuel cell |
| CN109830696B (en) * | 2019-01-09 | 2022-03-22 | 安徽明天氢能科技股份有限公司 | Preparation process of fuel cell membrane electrode |
| CN111584886B (en) * | 2020-05-21 | 2022-06-21 | 上海电气集团股份有限公司 | Carbon nanofiber, diffusion layer, membrane electrode, fuel cell and preparation method and application thereof |
| CN112599803A (en) * | 2020-12-16 | 2021-04-02 | 浙江博氢新能源有限公司 | Catalyst slurry for membrane electrode of fuel cell and preparation method thereof |
| CN113394409B (en) * | 2021-06-15 | 2022-07-12 | 山东仁丰特种材料股份有限公司 | Hydrogen fuel cell gas diffusion layer with double-microporous-layer structure and preparation method thereof |
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