CN102544548A - Hydrophobization fuel cell expanded graphite flow field and manufacturing method thereof - Google Patents
Hydrophobization fuel cell expanded graphite flow field and manufacturing method thereof Download PDFInfo
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- CN102544548A CN102544548A CN2012100468370A CN201210046837A CN102544548A CN 102544548 A CN102544548 A CN 102544548A CN 2012100468370 A CN2012100468370 A CN 2012100468370A CN 201210046837 A CN201210046837 A CN 201210046837A CN 102544548 A CN102544548 A CN 102544548A
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- expanded graphite
- flow field
- fuel cell
- meterial
- graphite meterial
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a hydrophobization fuel cell expanded graphite flow field and a manufacturing method thereof. The hydrophobization fuel cell expanded graphite flow field is manufactured by a porous expanded graphite material, and is characterized in that holes of the expanded graphite material are provided with hydrophobic fillers, and the upper surfaces of the hydrophobic fillers and the surface of the expanded graphite material are arranged on the same horizontal plane. The hydrophobization fuel cell expanded graphite flow field disclosed by the invention is manufactured simply, has a hydrophobization function, prompts drainage of liquid water during running of a cell and prevents MEA (Membrane Electrode Assembly) from being flooded during the running of the cell; and by utilizing the hydrophobization fuel cell expanded graphite flow field manufactured by the method disclosed by the invention, water management pressure can be effectively reduced and utilization ratio of reaction gas is improved during the running of the fuel cell.
Description
Technical field
The present invention relates to field of electrochemical batteries, specifically a kind of hydrophobisation fuel cell expanded graphite flow field and preparation method thereof.
Background technology
Fuel cell is a kind of TRT that chemical energy in fuel and the oxidant is converted into electric energy through the electrocatalytic reaction on the electrode.It does not receive the restriction of Carnot cycle, can efficiently chemical energy be converted into electric energy.Characteristics such as Proton Exchange Membrane Fuel Cells (Proton Exchange Membrane Fuel Cell, be called for short PEMFC) is owing to have cold-starting, and is simple in structure, easy to operate are the power sources that the most useful hope is applied to following electric automobile.
Because fuel cell is the chemical reaction process of a complicacy when work, exists heat balance and water balance problem, wherein the water management in the fuel cell operation is a problem that is difficult to control.When the water yield is lacked (relative humidity is low) slightly in the reaction gas, PEM is become dry, resistance increases, thereby makes the electromigration of proton become difficult, the operation of fuel cells mis-behave.The water yield is many slightly, in guiding gutter, forms ponding again easily, stops up the path of reacting gas, causes gas distribution inequality in the battery pack, influences battery performance, can cause MEA that water logging, battery failure take place when serious.
Summary of the invention
According to the technical problem of above-mentioned proposition, and a kind of hydrophobisation fuel cell expanded graphite flow field and preparation method thereof is provided.Expanded graphite meterial through to porous is filled hydrophobic resin; Thereby be prepared into hydrophobisation fuel cell expanded graphite flow field; Make surface, flow field hydrophobic, promote the discharge of inside battery water in the battery operation, can effectively improve the stability of battery operation and the utilance of gas.The technological means that the present invention adopts is following:
A kind of hydrophobisation fuel cell expanded graphite flow field; Expanded graphite meterial by porous is processed; It is characterized in that: be provided with the filler with hydrophobicity in the hole of said expanded graphite meterial, the upper surface of said filler and the surface of said expanded graphite meterial are on same horizontal plane.
As preferably, said filler comprises one deck packed layer at least.
As preferably, said packed layer material is a kind of in polyflon, polyvinylidene fluoride resin or the poly(perfluoropropene) resin.
The present invention also provides the preparation method in a kind of hydrophobisation fuel cell expanded graphite flow field, it is characterized in that comprising the steps:
1. be 10 in vacuum degree
-2Under the vacuum condition of Pa, said expanded graphite meterial is immersed 5-20min in the polytetrafluoroethylene suspension-turbid liquid;
2. under 150 ℃～400 ℃, the said expanded graphite meterial that will pass through after 1. step is handled solidifies 2～4h through after the surface treatment, and the polytetrafluoroethylene of immersion and said expanded graphite meterial are fixed, and forms layer of filled layer I.
As preferably, also comprise the steps:
3. be 10 in vacuum degree
-2Under the vacuum condition of Pa, the said expanded graphite meterial that will pass through after 2. step is handled immerses 5-20min in Kynoar emulsion or the poly(perfluoropropene) emulsion;
4. under 150 ℃～400 ℃, the said expanded graphite meterial that will pass through after 3. step is handled solidifies 2～4h through after the surface treatment, and the Kynoar of immersion or poly(perfluoropropene) are fixed with said expanded graphite meterial, formation layer of filled layer II.
As preferably, the concentration of said polytetrafluoroethylene suspension-turbid liquid, Kynoar emulsion or poly(perfluoropropene) emulsion is 0.5%-10%.
As preferably, the concentration of said polytetrafluoroethylene suspension-turbid liquid, Kynoar emulsion or poly(perfluoropropene) emulsion is 1%-5%.
As preferably, the mass fraction of the polyflon that contains in the said expanded graphite meterial after the processing, polyvinylidene fluoride resin or poly(perfluoropropene) resin is 1%-15%.
As preferably, the mass fraction of the polyflon that contains in the said expanded graphite meterial after the processing, polyvinylidene fluoride resin or poly(perfluoropropene) resin is 2%-8%.
The present invention has the following advantages:
1, under the condition that can not have at the contact resistance of flow field material significantly to increase, the hydrophobicity in flow field is improved greatly, make fuel battery flow field have hydrophobic function preferably.
2, can promote inside battery to generate the discharge of aqueous water, reduce the generation of MEA water logging phenomenon in the battery operation, improve the stability of battery operation.
3, can alleviate water management pressure in the fuel cell operation, improve the utilance of fuel cell reaction gas simultaneously.
This present invention can extensively promote in fields such as electrochemical cells for the foregoing reasons.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation.
Fig. 1 is that filler is the cutaway view of layer of filled layer in the expanded graphite meterial of the present invention.
Fig. 2 is that filler is the cutaway view of two-layer packed layer in the expanded graphite meterial of the present invention.
Fig. 3 is that filler is the flow field contact angle sketch map of one deck in the expanded graphite meterial of the present invention.
Fig. 4 is that filler is two-layer flow field contact angle sketch map in the expanded graphite meterial of the present invention.
Fig. 5 is a front view of the present invention.
Fig. 6 is that filler is the two-layer flow field and the flow field contact resistance comparison diagram of filling in the expanded graphite meterial of the present invention.
Fig. 7 is that filler is a pile internal resistance variation diagram in the two-layer flow field pile and the flow field pile parking purge of filling in the expanded graphite meterial of the present invention.
Embodiment
To a kind of hydrophobisation fuel cell expanded graphite of the present invention flow field and preparation method thereof, do further detailed explanation below in conjunction with embodiment.
Embodiment 1:
The expanded graphite meterial 1 of 20 thickness porous that is 3mm is put into seal groove vacuumize processing, vacuum degree reaches 10 in seal groove
-2Stopping during pa vacuumizing, is that 1% polytetrafluoroethylene suspension-turbid liquid (solvent is a water) sucks and is equipped with in the stuffing box of expanded graphite meterial 1 with concentration, makes expanded graphite meterial 1 immerse wherein 10min; Expanded graphite meterial after soaking 1 is taken out; Utilize blotting paper that the resin on expanded graphite meterial 1 surface is siphoned away; Under 340 ℃～360 ℃, be cured, be 3h curing time, and it is fixing to solidify the polytetrafluoroethylene and the expanded graphite meterial 1 that immerse the back; Thereby form layer of filled layer I201 (as shown in Figure 1), promptly form one deck hydrophobic network.Through test shows, the mass fraction of the polyflon that contains in the expanded graphite meterial 1 after the processing is 2.6%; In the hydrophobic test, the contact angle on expanded graphite meterial 1 surface after the filling is 99.6 (as shown in Figure 3, wherein A is a water droplet).With 20 expanded graphite meterials 1 after filling respectively processing and preparing become required fuel cell with expanded graphite flow field (as shown in Figure 5).
Embodiment 2:
The expanded graphite meterial 1 of 20 thickness porous that is 3mm is put into seal groove vacuumize processing, vacuum degree reaches 10 in seal groove
-2Stopping during pa vacuumizing, is that 1% polytetrafluoroethylene suspension-turbid liquid (solvent is a water) sucks and is equipped with in the stuffing box of expanded graphite meterial 1 with concentration, makes expanded graphite meterial 1 immerse wherein 10min; Expanded graphite meterial after soaking 1 is taken out; Utilize blotting paper that the liquid on expanded graphite meterial 1 surface is siphoned away; Under 340 ℃～360 ℃, be cured, be 3h curing time, and it is fixing to solidify the polytetrafluoroethylene and the expanded graphite meterial 1 that immerse the back; Thereby form layer of filled layer I201 (as shown in Figure 1), promptly form the hydrophobic network; To pass through expanded graphite meterial 1 after the above-mentioned processing again and be reentered into and vacuumize processing in the seal groove, vacuum degree reaches 10 in seal groove
-2Stop during pa vacuumizing, concentration is that 1% Kynoar emulsion (solvent is N, the N-dimethylacetylamide) sucks and is equipped with in the stuffing box of expanded graphite meterial 1, makes expanded graphite meterial 1 immerse wherein 10min; Expanded graphite meterial after soaking 1 is taken out; Utilize blotting paper that the liquid on expanded graphite meterial 1 surface is siphoned away; Under 180～200 ℃, be cured, be 3h curing time, and it is fixing to solidify the Kynoar and the expanded graphite meterial 1 that immerse the back; Thereby on packed layer I201, form layer of filled layer II202 (as shown in Figure 2), promptly form one deck hydrophobic network.Through test shows, the mass fraction of the polyflon that contains in the expanded graphite meterial 1 after the processing is 2.3%, and the mass fraction of the polyvinylidene fluoride resin that contains is 6.1%; In the hydrophobic test, the contact angle on 1 surface, expanded graphite flow field after the filling is 114 (as shown in Figure 4, wherein A is a water droplet).With 20 expanded graphite meterials 1 after filling respectively processing and preparing become required fuel cell with expanded graphite flow field (as shown in Figure 5).Fig. 6 is that filler is the two-layer flow field and the flow field contact resistance comparison diagram of filling in the expanded graphite meterial of the present invention, the flow field of a for filling among the figure, and b is the flow field after filling.Fig. 7 is that filler is a pile internal resistance variation diagram in the two-layer flow field pile and the flow field pile parking purge of filling in the expanded graphite meterial of the present invention, and c is the flow field pile after filling, the flow field pile of d for filling among the figure.
The above; Be merely the preferable embodiment of the present invention; But protection scope of the present invention is not limited thereto; Any technical staff who is familiar with the present technique field is equal to replacement or change according to technical scheme of the present invention and inventive concept thereof in the technical scope that the present invention discloses, all should be encompassed within protection scope of the present invention.
Claims (9)
1. hydrophobisation fuel cell expanded graphite flow field; Expanded graphite meterial (1) by porous is processed; It is characterized in that: be provided with the filler (2) with hydrophobicity in the hole of said expanded graphite meterial (1), the surface of the upper surface of said filler (2) and said expanded graphite meterial (1) is on same horizontal plane.
2. hydrophobisation fuel cell expanded graphite according to claim 1 flow field, it is characterized in that: said filler (2) comprises one deck packed layer at least.
3. hydrophobisation fuel cell expanded graphite according to claim 2 flow field is characterized in that: said packed layer material is a kind of in polyflon, polyvinylidene fluoride resin or the poly(perfluoropropene) resin.
4. the preparation method in a hydrophobisation fuel cell expanded graphite as claimed in claim 1 flow field is characterized in that comprising the steps:
1. be 10 in vacuum degree
-2Under the vacuum condition of Pa, said expanded graphite meterial (1) is immersed 5-20min in the polytetrafluoroethylene suspension-turbid liquid;
2. under 150 ℃～400 ℃, the said expanded graphite meterial (1) that will pass through after 1. step is handled solidifies 2～4h through after the surface treatment, makes the polytetrafluoroethylene of immersion and said expanded graphite meterial (1) fixing, forms layer of filled layer I (201).
5. preparation method according to claim 4 is characterized in that also comprising the steps:
3. be 10 in vacuum degree
-2Under the vacuum condition of Pa, the said expanded graphite meterial (1) that will pass through after 2. step is handled immerses 5-20min in Kynoar emulsion or the poly(perfluoropropene) emulsion;
4. under 150 ℃～400 ℃; The said expanded graphite meterial (1) that will pass through after 3. step is handled solidifies 2～4h through after the surface treatment; Make Kynoar or poly(perfluoropropene) and the said expanded graphite meterial (1) of immersion fixing, form layer of filled layer II (202).
6. according to claim 4 or 5 described preparation methods, it is characterized in that: the concentration of said polytetrafluoroethylene suspension-turbid liquid, Kynoar emulsion or poly(perfluoropropene) emulsion is 0.5%-10%.
7. preparation method according to claim 6 is characterized in that: the concentration of said polytetrafluoroethylene suspension-turbid liquid, Kynoar emulsion or poly(perfluoropropene) emulsion is 1%-5%.
8. according to claim 4 or 5 described preparation methods, it is characterized in that: the mass fraction of polyflon, polyvinylidene fluoride resin or the poly(perfluoropropene) resin that contains in the said expanded graphite meterial (1) after the processing is 1%-15%.
9. preparation method according to claim 8 is characterized in that: the mass fraction of polyflon, polyvinylidene fluoride resin or the poly(perfluoropropene) resin that contains in the said expanded graphite meterial (1) after the processing is 2%-8%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100468370A CN102544548A (en) | 2012-02-27 | 2012-02-27 | Hydrophobization fuel cell expanded graphite flow field and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100468370A CN102544548A (en) | 2012-02-27 | 2012-02-27 | Hydrophobization fuel cell expanded graphite flow field and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114094135A (en) * | 2021-10-10 | 2022-02-25 | 北京工业大学 | Liquid water self-adaptive flow field plate of fuel cell capable of automatically switching parallel flow field and serpentine flow field |
Citations (4)
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| CN101145619A (en) * | 2006-09-15 | 2008-03-19 | 新源动力股份有限公司 | Hydrothermal processing method for fuel battery current field |
| CN101587953A (en) * | 2008-05-23 | 2009-11-25 | 汉能科技有限公司 | The process for hydrophobicizing of a kind of fuel cell porous basic unit |
| CN101630746A (en) * | 2009-06-19 | 2010-01-20 | 武汉银泰科技燃料电池有限公司 | Fuel cell flow field plate with anti-seepage and hydrophobic performance as well as special impregnant, impregnation method and device thereof |
| CN202474104U (en) * | 2012-02-27 | 2012-10-03 | 新源动力股份有限公司 | Hydrophobic fuel battery expansion graphite flow field |
-
2012
- 2012-02-27 CN CN2012100468370A patent/CN102544548A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101145619A (en) * | 2006-09-15 | 2008-03-19 | 新源动力股份有限公司 | Hydrothermal processing method for fuel battery current field |
| CN101587953A (en) * | 2008-05-23 | 2009-11-25 | 汉能科技有限公司 | The process for hydrophobicizing of a kind of fuel cell porous basic unit |
| CN101630746A (en) * | 2009-06-19 | 2010-01-20 | 武汉银泰科技燃料电池有限公司 | Fuel cell flow field plate with anti-seepage and hydrophobic performance as well as special impregnant, impregnation method and device thereof |
| CN202474104U (en) * | 2012-02-27 | 2012-10-03 | 新源动力股份有限公司 | Hydrophobic fuel battery expansion graphite flow field |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114094135A (en) * | 2021-10-10 | 2022-02-25 | 北京工业大学 | Liquid water self-adaptive flow field plate of fuel cell capable of automatically switching parallel flow field and serpentine flow field |
| CN114094135B (en) * | 2021-10-10 | 2023-06-09 | 北京工业大学 | Liquid water self-adaptive flow field plate of fuel cell capable of automatically switching parallel flow field and serpentine flow field |
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Application publication date: 20120704 |