CN109509887A - A kind of preparation method of fuel battery gas diffusion layer microporous layers - Google Patents
A kind of preparation method of fuel battery gas diffusion layer microporous layers Download PDFInfo
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- CN109509887A CN109509887A CN201710879659.2A CN201710879659A CN109509887A CN 109509887 A CN109509887 A CN 109509887A CN 201710879659 A CN201710879659 A CN 201710879659A CN 109509887 A CN109509887 A CN 109509887A
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- 238000009792 diffusion process Methods 0.000 title claims abstract description 67
- 239000000446 fuel Substances 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 43
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 43
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 28
- 238000007731 hot pressing Methods 0.000 claims abstract description 23
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 18
- 239000010439 graphite Substances 0.000 claims abstract description 18
- 239000006210 lotion Substances 0.000 claims abstract description 16
- 238000001354 calcination Methods 0.000 claims abstract description 10
- 239000011268 mixed slurry Substances 0.000 claims abstract description 10
- 239000011347 resin Substances 0.000 claims abstract description 9
- 229920005989 resin Polymers 0.000 claims abstract description 9
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 8
- 238000007711 solidification Methods 0.000 claims abstract description 6
- 230000008023 solidification Effects 0.000 claims abstract description 6
- 238000012545 processing Methods 0.000 claims abstract description 5
- 239000002002 slurry Substances 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 7
- 239000004917 carbon fiber Substances 0.000 claims description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 7
- 239000000839 emulsion Substances 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 4
- 238000011068 loading method Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000000428 dust Substances 0.000 claims description 2
- 238000007650 screen-printing Methods 0.000 claims description 2
- 238000009954 braiding Methods 0.000 claims 1
- 239000011148 porous material Substances 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000010355 oscillation Effects 0.000 description 6
- 235000019441 ethanol Nutrition 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 4
- 239000006230 acetylene black Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000003273 ketjen black Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
- H01M4/8825—Methods for deposition of the catalytic active composition
- H01M4/8828—Coating with slurry or ink
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- 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
-
- 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
- H01M4/8878—Treatment steps after deposition of the catalytic active composition or after shaping of the electrode being free-standing body
- H01M4/8882—Heat treatment, e.g. drying, baking
-
- 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
- H01M4/8878—Treatment steps after deposition of the catalytic active composition or after shaping of the electrode being free-standing body
- H01M4/8896—Pressing, rolling, calendering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/023—Porous and characterised by the material
- H01M8/0241—Composites
- H01M8/0245—Composites in the form of layered or coated products
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
The present invention relates to microporous layers preparation methods in a kind of fuel battery gas diffusion layer, the following steps are included: first gas diffusion layers are impregnated with hydrophobic PTFE resin lotion, it dries and calcination solidifies, the gas diffusion layers handled well, then gas diffusion layers wherein support on one side carbon dust-graphite powder-PTFE resin mixed slurry and dry and calcination solidification, finally hot-pressing processing is carried out to get to the gas diffusion layers with microporous layers of the invention to being supported with carbon dust-graphite powder-PTFE resin mixed slurry gas diffusion layers.Compared with prior art, the advantages that microporous layers obtained by the present invention have pore structure uniformly single, good conductivity, hydrophobicity is strong.It is particularly conducive to the water management of fuel cell electrode, is conducive to the stability for improving fuel cell electrode operation.
Description
Technical field
The present invention relates to fuel cell fields, more particularly, to a kind of preparation side of fuel battery gas diffusion layer microporous layers
Method.
Background technique
PEMFC electrode is a kind of gas-diffusion electrode, and PEMFC electrode is a kind of porous gas-diffusion electrode, and gas expands
Scattered layer is the important composition material of electrode.Common gas diffusion layer material has carbon fiber paper, carbon fiber woven cloth, non-woven cloth
And carbon black paper etc..Wherein carbon fiber paper is a kind of gas diffusion layer material being widely used in electrode, PEMFC it must satisfy
Following performance requirement: (1) uniform porous structure assigns its excellent permeability；(2) low resistivity assigns its height
Electronic conduction ability；(3) close structure and surfacing reduce contact resistance, improve electric conductivity；(4) have centainly
Mechanical strength provides the stability of long period of operation condition lower electrode arrangement conducive to the production of electrode；
As the carbon fiber paper of German SGL has both reached certain intensity in mechanical performance, while also remaining good
Electricity, thermal property and gas permeation rate.Plurality of stable performance and its high performance-price ratio are the main mesh that carbon fiber paper develops at present
Mark.
Commercial MEA electrode is generally 7 layers of structure at present, and wherein CCM is that two catalyst layers press from both sides one layer of proton conductive
Thriple decker sandwich's structure of film, compound two layers of the both sides of Catalytic Layer, the diffusion layer with microporous layers is constituted.At present research and
Material is largely focused on film, catalyst, the stability of carbon paper diffusion layer structure, high-performance etc..To micro- on diffusion layer
Aperture layer research is relatively smaller.
At present in fuel cells applications, the microporous layers that microporous layers generally use conductive carbon powder and PTFE to make binder are formed,
Its loading on the gas diffusion is generally 1-4mg/cm2. by adjusting PTFE and vulcaXC72 in microporous layers,
Ketjen black, the ratio of acetylene black etc. adjust the hydrophobicitys of microporous layers, electric conductivity and gas permeability.If increasing micropore
The hydrophobicity of layer, this is completed by the increase of PTFE content.On the one hand the addition of high PTFE increases the hydrophobicity of electrode,
The pore structure for changing electrode microporous layers, on the one hand reduces electric conductivity.
In some particular applications, only come and the molecular network knot of PTFE high score by VULCAN XC72 or acetylene black
The micro cavity layer structures that structure adjusts fuel cell become extremely difficult to mould the structure of specific function, and reason is that PTFE has and changes
Variable orifice structure, electric conductivity, the triple compound actions of hydrophobicity.
The invention reside in a kind of method is provided, hydrophobic spherical graphite is partly or entirely substituted into original VULCAN
XC72 acetylene black porous, electrically conductive substance.It is compared with PTFE, spherical graphite not only has strong hydrophobicity, and has highly conductive
Property, and spherical graphite accumulates the possessed pore structure pore structure of different sizes obtained by PTFE, and aperture ratio is more uniform.
Summary of the invention
The present invention relates to the microporous layers process of preparing in a kind of fuel battery gas diffusion layer, this method includes following
Step:
(1) hydrophobic PTFE emulsion is impregnated to gas diffusion layers first, dries and calcination solidification, the gas handled well expands
Dissipate layer；
(2) microporous layers are supported on the gas diffusion layers handled well, loading mode, which uses, to be sprayed, in blade coating or silk-screen printing
One or more of modes by carbon dust-graphite powder-PTFE mixed slurry, be applied on the diffusion layer handled well in (1), then into
Row drying and calcination solidification.
(3) to be supported with carbon dust-graphite powder-PTFE mixed slurry gas diffusion layers carry out hot-pressing processing to get to tool
There is the diffusion layer structure of the micro cavity layer structures.
The gas diffusion layers are the conductive carbon paper carbon fiber woven cloth of thickness 0.10-~0.36mm.
The gas diffusion layers, which is characterized in that the hydrophobic lotions are the PTTE cream that concentration is 5~30wt%
Liquid.
The microporous layers of the gas diffusion layers supported, carbon dust-graphite powder-PTFE resin mixed slurry load
Carrying capacity is 2~26mg/cm2。
Carbon dust in the microporous layers slurry carbon dust-graphite powder-PTFE resin mixed slurry: graphite powder: PTFE resin
Ratio are as follows: 0-10%: 50-90%: 10-50%.
The conductive carbon powder, partial size is between 15 nanometers~30 nanometers, and specific surface area is in 250-1000m2/g, preferably
Commodity are vulcan-XC72.
The graphite powder be high-purity spherical graphite powder, purity be greater than 99.6%, granularity be generally 100-18000 mesh it
Between, preferably 300-10000 mesh.Specific surface area is between 0.18-40m2/g.
The PTFE emulsion, the molecular weight of PTFE are greater than 50-600 ten thousand, between generally 300-500 ten thousand.
The drying course, the drying temperature are 50~150 DEG C, generally 70-90 DEG C.
The calcination process, calcination solidification temperature are 350~400 DEG C.
The autoclaving process, which is characterized in that the temperature of the hot-pressing processing is 180~300 DEG C, and pressure is
10~50kg/cm2。
Specific embodiment
The present invention is described in detail combined with specific embodiments below.
Embodiment 1
(1) will the 10cm*10cm of a piece of softness SGL company produce carbon paper 10%PTFE lotion in impregnate, after taking-up
It is slowly dried at a temperature of 80 DEG C, is put into 360 DEG C of Muffle furnaces and is sintered after drying, both obtain the diffusion layer without microporous layers.
Embodiment 2
(1) will the 10cm*10cm of a piece of softness SGL company produce carbon paper 15%PTFE lotion in impregnate, after taking-up
It is slowly dried at a temperature of 80 DEG C, is put into 360 DEG C of Muffle furnaces and is sintered after drying.
(2) the 1000 mesh spherical graphites for taking 2 grams of Qingdao graphite factories to produce, purity are greater than 99.9%.The ethyl alcohol of 50ml is added
With the water ultrasonic vibration of 50ml, 4 grams of 15%PTFE lotion are added after 15min, stirs 15min after sonic oscillation 15min.It will slurry
Material is put on the carbon paper for the SGL company production for being screen printed onto 10cm*10cm several times.Unit area can be made in this way and support slurry
Expect 26mg/cm2Gas diffusion layers.
(3) by step 1, diffusion layer made from 2, which is put into hydraulic press, carries out hot pressing, and at 250 DEG C, pressure exists hot pressing temperature
30kg/cm2The diffusion layer pressed is taken out into after hot pressing
1,2,3 steps are above up to the diffusion layer of the present invention containing microporous layers.
Embodiment 3
(1) will the 10cm*10cm of a piece of softness SGL company produce carbon paper 10%PTFE lotion in impregnate, after taking-up
It is slowly dried at a temperature of 80 DEG C, is put into 360 DEG C of Muffle furnaces and is sintered after drying.
(2) the 10000 mesh spherical graphites for taking 1 gram of Qingdao graphite factory to produce, purity are greater than 99.9%.The ethyl alcohol of 50ml is added
With the water ultrasonic vibration of 50ml, 2 grams of 15%PTFE lotion are added after 15min, stirs 15min after sonic oscillation 15min.By slurry
It is put on the carbon paper for the SGL company production for being screen printed onto 10cm*10cm several times.Unit area can be made in this way and support slurry
13mg/cm2Gas diffusion layers.
(3) by step 1, diffusion layer made from 2, which is put into hydraulic press, carries out hot pressing, and at 250 DEG C, pressure exists hot pressing temperature
30kg/cm2The diffusion layer pressed is taken out after hot pressing.
1,2,3 steps are above up to the diffusion layer of the present invention containing microporous layers.
Embodiment 4
(1) will the 10cm*10cm of a piece of softness SGL company produce carbon paper 8%PTFE lotion in impregnate, after taking-up
It is slowly dried at a temperature of 80 DEG C, is put into 360 DEG C of Muffle furnaces and is sintered after drying.
(2) the 15000 mesh spherical graphites for taking 0.95 gram of Qingdao graphite factory to produce, 0.05g vulcan xc72 purity are greater than
99.9%.The ethyl alcohol of 50ml and the water ultrasonic vibration of 50ml is added, adds 2 grams of 25%PTFE lotion after 15min, sonic oscillation
15min is stirred after 15min.Slurry is put on the carbon paper for the SGL company production for being screen printed onto 10cm*10cm several times.In this way
Unit area can be made and support slurry 13mg/cm2Gas diffusion layers.
(3) by step 1, diffusion layer made from 2, which is put into hydraulic press, carries out hot pressing, and at 250 DEG C, pressure exists hot pressing temperature
30kg/cm2The diffusion layer pressed is taken out after hot pressing.
1,2,3 steps are above up to the diffusion layer of the present invention containing microporous layers.
Embodiment 5
(1) will the 10cm*10cm of a piece of softness SGL company produce carbon paper 10%PTFE lotion in impregnate, after taking-up
It is slowly dried at a temperature of 80 DEG C, is put into 360 DEG C of Muffle furnaces and is sintered after drying.
(2) the 15000 mesh spherical graphites for taking 1 gram of Qingdao graphite factory to produce, purity are greater than 99.9%.The ethyl alcohol of 50ml is added
With the water ultrasonic vibration of 50ml, 2 grams of 25%PTFE lotion are added after 15min, stirs 15min after sonic oscillation 15min.By slurry
It scratches on the carbon paper of the SGL company production of 10cm*10cm.Unit area can be made in this way and support slurry 15mg/cm2Gas
Diffusion layer.
(3) by step 1, diffusion layer made from 2, which is put into hydraulic press, carries out hot pressing, and at 250 DEG C, pressure exists hot pressing temperature
50kg/cm2The diffusion layer pressed is taken out after hot pressing.
1,2,3 steps are above up to the diffusion layer of the present invention containing microporous layers.
Embodiment 6
(1) will the 10cm*10cm of a piece of softness SGL company produce carbon paper 10%PTFE lotion in impregnate, after taking-up
It is slowly dried at a temperature of 80 DEG C, is put into 360 DEG C of Muffle furnaces and is sintered after drying.
(2) the 15000 mesh spherical graphites for taking 0.3 gram of Qingdao graphite factory to produce, purity are greater than 99.9%.The second of 50ml is added
The water ultrasonic vibration of pure and mild 50ml adds 1 gram of 30%PTFE lotion after 15min, stirs 15min after sonic oscillation 15min.It will slurry
Material is sprayed on the carbon paper of SGL company production of 10cm*10cm more be put into point.Unit area can be made in this way and support slurry 6mg/
cm2Gas diffusion layers.
(3) by step 1, diffusion layer made from 2, which is put into hydraulic press, carries out hot pressing, and at 250 DEG C, pressure exists hot pressing temperature
50kg/cm2The diffusion layer pressed is taken out after hot pressing.
1,2,3 steps are above up to the diffusion layer of the present invention containing microporous layers.
Embodiment 7 (general microporous layer)
(1) will the 10cm*10cm of a piece of softness SGL company produce carbon paper 10%PTFE lotion in impregnate, after taking-up
It is slowly dried at a temperature of 80 DEG C, is put into 360 DEG C of Muffle furnaces and is sintered after drying.
(2) 0.2 gram of vulcan xc72 is taken, the ethyl alcohol of 50ml and the water ultrasonic vibration of 50ml is added, is added after 15min
0.5 gram of 20%PTFE lotion, 15min is stirred after sonic oscillation 15min.By slurry be put into point more be sprayed on 10cm*10cm's
On the carbon paper that SGL company produces.Unit area can be made in this way and support slurry 3mg/cm2Gas diffusion layers.
(3) by step 1, diffusion layer made from 2, which is put into hydraulic press, carries out hot pressing, and at 250 DEG C, pressure exists hot pressing temperature
50kg/cm2The diffusion layer pressed is taken out after hot pressing.
Embodiment result: below table be will without microporous layers gas diffusion layers (embodiment 1) and containing microporous layers it is normal
Rule vulcan xc72 (embodiment 7) and graphite powder of the present invention do the aperture that the embodiment 6 of microporous layers is carried out with mercury injection method
Test data: it can be seen that after supporting microporous layers on diffusion layer, wherein the addition for xc72-PTFE layers of vulcan increases
Hole less than 0.5 micron, while the hole less than 7 microns is also increased slightly.For embodiment 6 of the present invention, microporous layers
Increasing is mainly 0.5 micron of hole below, and during our actual tests, 0.5 micron of hole pore-size distribution below is very equal
One, it is more dispersed different from the pore structure in embodiment 7 generally between 0.08-0.15 microns, for the hole less than 7 microns
Do not detect.Therefore it says, the pore structure and distribution of the present invention for changing microporous layers.
Following table is that we do diffusion layer with embodiment 6 and 7 and are assembled into the performance test that monocell carries out with CCM, wherein H2,
Air, RH=50%, 65 degree of electrode running temperature, operating pressure 0.6Bar.
As can be seen from the table, present invention gained microporous layers diffusion layer electrode (embodiment 6) is the same as (conventional diffusion layer electrode
(embodiment 7) is compared: there is performance to significantly improve the current density of electrode under high voltages, and the traditional electrode in high current
It is more excellent to spread Lyer current density.
Following table is that we do diffusion layer with embodiment 6 and 7 and are assembled into the performance test that monocell carries out with CCM, wherein H2,
Air, RH=50%, 65 degree of electrode running temperature, operating pressure 0.6Bar.In different time, fuel cell is in 0.70V
Running current variable density situation.
6,7 comparisons from embodiment are as can be seen that electrode diffusion layer of the present invention is steady for improving fuel cell electrode operation
It is qualitative to be significantly improved.
The present invention provides the preparation process and method of a kind of fuel cell microporous layer, is substituted with spherical graphite powder
Original common conductive black, to change the pore structure of microporous layers, hydrophobic property is reduced original thin to change microporous layers by PTFE
The drawbacks of aqueous and pore structure.Graphite powder is applied in microporous layers in the present invention, as the main hydrophobic conductive materials of microporous layers,
This pore structure to the microporous layers for improving battery, the operation stability for improving battery have obviously effect.
As described above, must not be explained although the present invention has been indicated and described referring to specific preferred embodiment
For the limitation to invention itself.It without prejudice to the spirit and scope of the invention as defined in the appended claims, can be right
Various changes can be made in the form and details for it.
Claims (11)
1. this method includes following step the present invention relates to the microporous layers process of preparing in a kind of fuel battery gas diffusion layer
It is rapid:
(1) hydrophobic PTFE emulsion is impregnated to gas diffusion layers first, dries and calcination solidifies, the gas diffusion handled well
Layer；
(2) microporous layers are supported on the gas diffusion layers handled well, loading mode, which uses, to be sprayed, one in blade coating or silk-screen printing
Carbon dust-graphite powder-PTFE mixed slurry is applied on the diffusion layer handled well in (1), is then dried by kind or several ways
Dry doubling calcination solidification；
(3) to be supported with carbon dust-graphite powder-PTFE mixed slurry gas diffusion layers carry out hot-pressing processing to get to have it is micro-
The diffusion layer structure of aperture layer structure.
2. conductive carbon paper or carbon fiber braiding that gas diffusion layers according to claim 1 are thickness 0.10-~0.36mm
Cloth.
3. gas diffusion layers according to claim 1, which is characterized in that the hydrophobic lotions be concentration be 5~
The PTFE emulsion of 30wt%.
4. the microporous layers of the gas diffusion layers according to claim 1 supported, the carbon dust-graphite powder-PTFE resin
The loading of mixed slurry is 2~26mg/cm2。
5. according to claim 1, the carbon dust in the microporous layers slurry carbon dust-graphite powder-PTFE resin mixed slurry: graphite
Powder: the ratio of PTFE resin are as follows: 0-10%: 50-90%: 10-50%.
6. conductive carbon powder according to claim 5, partial size is between 15 nanometers~30 nanometers, and specific surface area is in 250-
1000m2/g, preferred commodity are vulcan-XC72.
7. graphite powder according to claim 5 is high-purity spherical graphite powder, purity is greater than 99.6%, and granularity is generally
Between 100-18000 mesh, preferably 300-10000 mesh.Specific surface area is between 0.18-40m2/g.
8. PTFE emulsion according to claim 5, the molecular weight of PTFE is greater than 50-600 ten thousand, generally 300-500 ten thousand it
Between.
9. drying course according to claim 1, the drying temperature is 50~150 DEG C, generally 70-90 DEG C.
10. calcination process according to claim 1, calcination solidification temperature is 350~400 DEG C.
11. autoclaving process according to claim 1, which is characterized in that the temperature of the hot-pressing processing be 180~
300 DEG C, pressure is 10~50kg/cm2。
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110993965A (en) * | 2019-12-23 | 2020-04-10 | 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） | Preparation method of microporous layer in gas diffusion layer |
| CN112687897A (en) * | 2020-12-29 | 2021-04-20 | 长沙迅洋新材料科技有限公司 | Consolidation preparation method of waterproof breathable layer material for magnesium metal air battery |
| CN114709435A (en) * | 2022-06-02 | 2022-07-05 | 武汉氢能与燃料电池产业技术研究院有限公司 | Composite microporous layer in gas diffusion layer and preparation method thereof |
| US11764365B2 (en) | 2021-04-30 | 2023-09-19 | Hydrogenics Corporations | Fuel cell electrode with patterned microporous layer and methods of fabricating the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1949570A (en) * | 2005-10-10 | 2007-04-18 | 中国科学院大连化学物理研究所 | Gas diffusion layer for low temp fuel cell and preparing process thereof |
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| US8394551B2 (en) * | 2003-07-14 | 2013-03-12 | Umicore Ag & Co. Kg | Membrane electrode assembly for use in electrochemical devices |
| CN1949570A (en) * | 2005-10-10 | 2007-04-18 | 中国科学院大连化学物理研究所 | Gas diffusion layer for low temp fuel cell and preparing process thereof |
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| CN110993965A (en) * | 2019-12-23 | 2020-04-10 | 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） | Preparation method of microporous layer in gas diffusion layer |
| CN112687897A (en) * | 2020-12-29 | 2021-04-20 | 长沙迅洋新材料科技有限公司 | Consolidation preparation method of waterproof breathable layer material for magnesium metal air battery |
| US11764365B2 (en) | 2021-04-30 | 2023-09-19 | Hydrogenics Corporations | Fuel cell electrode with patterned microporous layer and methods of fabricating the same |
| CN114709435A (en) * | 2022-06-02 | 2022-07-05 | 武汉氢能与燃料电池产业技术研究院有限公司 | Composite microporous layer in gas diffusion layer and preparation method thereof |
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