CN115732705A - Fuel cell gas diffusion layer and preparation method thereof - Google Patents
Fuel cell gas diffusion layer and preparation method thereof Download PDFInfo
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- CN115732705A CN115732705A CN202211353636.5A CN202211353636A CN115732705A CN 115732705 A CN115732705 A CN 115732705A CN 202211353636 A CN202211353636 A CN 202211353636A CN 115732705 A CN115732705 A CN 115732705A
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Abstract
The invention discloses a fuel cell gas diffusion layer which comprises a substrate layer, wherein a first microporous layer is arranged on the substrate layer, a second microporous layer is arranged on the first microporous layer, the substrate layer is a carbon fiber substrate layer, and raw materials of the microporous layer comprise a hydrophobic material, conductive carbon black and a mixed solvent. The invention reduces the contact resistance of the gas diffusion layer by arranging the two microporous layers on the substrate layer, thereby reducing the energy loss of the gas diffusion layer and improving the service time of the fuel cell, and simultaneously improves the drainage performance of the gas diffusion layer by arranging the two microporous layers, and improves the resistance of the microporous layers by strictly controlling the temperature of secondary drying.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a gas diffusion layer of a fuel cell and a preparation method thereof.
Background
The gas diffusion layer is positioned between the catalyst layer and the bipolar plate, plays roles of supporting the catalyst layer, water vapor transmission, electron transfer and the like, and is one of key components of the fuel cell. The gas diffusion layer is generally a two-layer structure including a carbon substrate and a microporous layer. The microporous layer can not only increase the contact area with the catalytic layer and reduce the contact resistance in the PEMFC, but also plays an important role in gas-liquid transmission. The water enters the carbon substrate immediately after passing through the microporous layer and is then discharged into the flow channel, the number of channels occupied by the water in the carbon substrate can be reduced due to the existence of the microporous layer, and the water saturation of the GDL during water breakthrough is remarkably reduced, so that the battery performance at high current density is improved.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a fuel cell gas diffusion layer and a preparation method thereof.
The invention provides a fuel cell gas diffusion layer which comprises a substrate layer, wherein a first microporous layer is arranged on the substrate layer, and a second microporous layer is arranged on the first microporous layer.
Further, the substrate layer is a carbon fiber substrate layer, and the raw material of the microporous layer comprises a hydrophobic material, conductive carbon black and a mixed solvent.
A method of making a fuel cell gas diffusion layer comprising the steps of:
s1: preparing raw materials; preparing proper amount of conductive carbon black, hydrophobic material and mixed solvent,
s2: mixing raw materials, preparing a mixing container, injecting a mixed solvent, conductive carbon black and a hydrophobic material into the container according to a certain proportion, injecting the conductive carbon black and a proper amount of the mixed solvent during injection, stirring for 5min, then injecting the hydrophobic material, then adding a proper amount of the mixed solvent, and uniformly stirring for 30min;
s3: coating the slurry, namely mixing the raw materials to obtain the slurry, uniformly coating the stirred slurry on a carbon fiber substrate layer, and coating the slurry by coating equipment during coating to avoid repeated coating;
s4: primary drying, namely after the slurry is coated, placing the substrate layer in drying equipment for drying, wherein the drying temperature is within the range of 60-70 ℃, and the drying time is 50min;
s5: coating for the second time, namely coating the slurry on the first microporous layer again after the first microporous layer is cooled to room temperature after the drying is finished, and forming a second microporous layer after the slurry is coated;
and S6, secondary drying, namely placing the second microporous layer in drying equipment, drying the second microporous layer at the temperature of more than 200 ℃, directly taking out the dried second microporous layer after drying, and then cooling the second microporous layer to normal temperature to prepare the gas diffusion layer.
Further, the mixed solvent is mainly water or ethylene glycol.
Further, the order of injecting the raw materials into the mixing container needs to be strictly controlled during the raw material mixing process, so as to ensure that the raw materials can be uniformly mixed.
Further, the hydrophobic material is one of PTF, PDDA and FEP, and the conductive carbon black is one of graphitized carbon and superconducting carbon black.
The beneficial effects of the invention are as follows:
the invention reduces the contact resistance of the gas diffusion layer by arranging two microporous layers on the substrate layer, thereby reducing the energy loss of the gas diffusion layer and improving the service time of the fuel cell, and simultaneously, the double microporous layers improve the drainage performance of the gas diffusion layer and improve the resistance of the microporous layers by strictly controlling the temperature of secondary drying.
Drawings
FIG. 1 is a schematic structural diagram of a gas diffusion layer of a fuel cell according to the present invention;
fig. 2 is a contact resistance curve of a method for preparing a gas diffusion layer for a fuel cell according to the present invention.
In the figure: 1 a substrate layer, 2 a first microporous layer, 3 a second microporous layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example one
Referring to fig. 1-2, a gas diffusion layer for a fuel cell, comprising a substrate layer on which a first microporous layer is disposed and a second microporous layer is disposed on the first microporous layer, characterized in that the substrate layer is a carbon fiber substrate layer, and raw materials of the microporous layer include a hydrophobic material, conductive carbon black and a mixed solvent.
The invention discloses a preparation method of a gas diffusion layer of a fuel cell, which comprises the following steps:
s1: preparing raw materials; preparing proper amount of conductive carbon black, hydrophobic material and mixed solvent,
s2: mixing raw materials, preparing a mixing container, injecting a mixed solvent, conductive carbon black and a hydrophobic material into the container according to a certain proportion, injecting the conductive carbon black and a proper amount of the mixed solvent during injection, stirring for 5min, then injecting the hydrophobic material, then adding a proper amount of the mixed solvent, and uniformly stirring for 30min;
s3: coating the slurry, namely mixing the raw materials to obtain the slurry, uniformly coating the stirred slurry on a carbon fiber substrate layer, and coating the slurry by coating equipment during coating to avoid repeated coating;
s4: primary drying, namely drying the substrate layer in drying equipment after the slurry is coated, wherein the drying temperature is in the range of 60-70 ℃, and the drying time is 50min;
s5: coating for the second time, namely coating the slurry on the first microporous layer again after the first microporous layer is cooled to the room temperature after the drying is finished, and forming a second microporous layer after the slurry is coated;
and S6, secondary drying, namely placing the second microporous layer in drying equipment, drying the second microporous layer at the temperature of more than 200 ℃, directly taking out the dried second microporous layer after drying, and then cooling the second microporous layer to normal temperature to prepare the gas diffusion layer.
In the invention, the mixed solvent is mainly water or glycol, the sequence of injecting the raw materials into the mixing container needs to be strictly controlled in the process of mixing the raw materials, so that the raw materials can be uniformly mixed, the hydrophobic material is one of PTF, PDDA and FEP, and the conductive carbon black is one of graphitized carbon and superconducting carbon black.
Example two
Referring to fig. 1-2, a gas diffusion layer for a fuel cell, comprising a substrate layer on which a first microporous layer is disposed and a second microporous layer is disposed on the first microporous layer, characterized in that the substrate layer is a carbon fiber substrate layer, and raw materials of the microporous layer include a hydrophobic material, conductive carbon black and a mixed solvent.
The invention discloses a preparation method of a gas diffusion layer of a fuel cell, which comprises the following steps:
s1: preparing raw materials; preparing proper amount of conductive carbon black, hydrophobic material and mixed solvent,
s2: mixing raw materials, preparing a mixing container, injecting a mixed solvent, conductive carbon black and a hydrophobic material into the container according to a certain proportion, injecting the conductive carbon black and a proper amount of the mixed solvent during injection, stirring for 5min, then injecting the hydrophobic material, then adding a proper amount of the mixed solvent, and uniformly stirring for 30min;
s3: coating the slurry, namely mixing the raw materials to obtain the slurry, uniformly coating the stirred slurry on a carbon fiber substrate layer, and coating the slurry by coating equipment during coating to avoid repeated coating;
s4: primary drying, namely drying the substrate layer in drying equipment after the slurry is coated, wherein the drying temperature is in the range of 60-70 ℃, and the drying time is 50min;
s5: coating for the second time, namely coating the slurry on the first microporous layer again after the first microporous layer is cooled to room temperature after the drying is finished, and forming a second microporous layer after the slurry is coated;
and S6, secondary drying, namely placing the second microporous layer in drying equipment, controlling the temperature to be more than 250 ℃ to dry the second microporous layer, directly taking out the second microporous layer after drying is finished, and then cooling the second microporous layer to be placed at normal temperature to obtain the gas diffusion layer.
In the invention, the mixed solvent is mainly water or glycol, the sequence of injecting the raw materials into the mixing container needs to be strictly controlled in the process of mixing the raw materials, so that the raw materials can be uniformly mixed, the hydrophobic material is one of PTF, PDDA and FEP, and the conductive carbon black is one of graphitized carbon and superconducting carbon black.
EXAMPLE III
Referring to fig. 1-2, a fuel cell gas diffusion layer including a substrate layer on which a first microporous layer is disposed and a second microporous layer is disposed on the first microporous layer, wherein the substrate layer is a carbon fiber substrate layer, and raw materials of the microporous layer include a hydrophobic material, conductive carbon black, and a mixed solvent.
The invention discloses a preparation method of a gas diffusion layer of a fuel cell, which comprises the following steps:
s1: preparing raw materials; preparing proper amount of conductive carbon black, hydrophobic material and mixed solvent,
s2: mixing raw materials, preparing a mixing container, injecting a mixed solvent, conductive carbon black and a hydrophobic material into the container according to a certain proportion, during injection, firstly injecting the conductive carbon black, then adding a proper amount of the mixed solvent, stirring for 5min, then injecting the hydrophobic material, then adding a proper amount of the mixed solvent, and uniformly stirring for 30min;
s3: coating the slurry, namely mixing the raw materials to obtain the slurry, uniformly coating the stirred slurry on a carbon fiber substrate layer, and coating the slurry by coating equipment during coating to avoid repeated coating;
s4: primary drying, namely after the slurry is coated, placing the substrate layer in drying equipment for drying, wherein the drying temperature is within the range of 60-70 ℃, and the drying time is 50min;
s5: coating for the second time, namely coating the slurry on the first microporous layer again after the first microporous layer is cooled to room temperature after the drying is finished, and forming a second microporous layer after the slurry is coated;
and S6, secondary drying, namely placing the second microporous layer in drying equipment, drying the second microporous layer at the temperature of over 300 ℃, directly taking out the dried second microporous layer after drying, and cooling the second microporous layer to normal temperature to prepare the gas diffusion layer.
In the invention, the mixed solvent is mainly water or ethylene glycol, the sequence of injecting the raw materials into the mixing container needs to be strictly controlled in the process of mixing the raw materials, so that the raw materials can be uniformly mixed, the hydrophobic material is one of PTF, PDDA and FEP, and the conductive carbon black is one of graphitized carbon and superconducting carbon black.
Example four
Referring to fig. 1-2, a gas diffusion layer for a fuel cell, comprising a substrate layer on which a first microporous layer is disposed and a second microporous layer is disposed on the first microporous layer, characterized in that the substrate layer is a carbon fiber substrate layer, and raw materials of the microporous layer include a hydrophobic material, conductive carbon black and a mixed solvent.
The invention discloses a preparation method of a gas diffusion layer of a fuel cell, which comprises the following steps:
s1: preparing raw materials; preparing proper amount of conductive carbon black, hydrophobic material and mixed solvent,
s2: mixing raw materials, preparing a mixing container, injecting a mixed solvent, conductive carbon black and a hydrophobic material into the container according to a certain proportion, injecting the conductive carbon black and a proper amount of the mixed solvent during injection, stirring for 5min, then injecting the hydrophobic material, then adding a proper amount of the mixed solvent, and uniformly stirring for 30min;
s3: coating the slurry, namely mixing the raw materials to obtain the slurry, uniformly coating the stirred slurry on a carbon fiber substrate layer, and coating the slurry by coating equipment during coating to avoid repeated coating;
s4: primary drying, namely drying the substrate layer in drying equipment after the slurry is coated, wherein the drying temperature is in the range of 60-70 ℃, and the drying time is 50min;
s5: coating for the second time, namely coating the slurry on the first microporous layer again after the first microporous layer is cooled to room temperature after the drying is finished, and forming a second microporous layer after the slurry is coated;
and S6, secondary drying, namely placing the second microporous layer in drying equipment, controlling the temperature to be more than 350 ℃ to dry the second microporous layer, directly taking out the dried second microporous layer after drying, and then cooling the second microporous layer to be placed at normal temperature to obtain the gas diffusion layer.
In the invention, the mixed solvent is mainly water or ethylene glycol, the sequence of injecting the raw materials into the mixing container needs to be strictly controlled in the process of mixing the raw materials, so that the raw materials can be uniformly mixed, the hydrophobic material is one of PTF, PDDA and FEP, and the conductive carbon black is one of graphitized carbon and superconducting carbon black.
EXAMPLE five
Referring to fig. 1-2, a fuel cell gas diffusion layer including a substrate layer on which a first microporous layer is disposed and a second microporous layer is disposed on the first microporous layer, wherein the substrate layer is a carbon fiber substrate layer, and raw materials of the microporous layer include a hydrophobic material, conductive carbon black, and a mixed solvent.
The invention discloses a preparation method of a gas diffusion layer of a fuel cell, which comprises the following steps:
s1: preparing raw materials; preparing proper amount of conductive carbon black, hydrophobic material and mixed solvent,
s2: mixing raw materials, preparing a mixing container, injecting a mixed solvent, conductive carbon black and a hydrophobic material into the container according to a certain proportion, injecting the conductive carbon black and a proper amount of the mixed solvent during injection, stirring for 5min, then injecting the hydrophobic material, then adding a proper amount of the mixed solvent, and uniformly stirring for 30min;
s3: coating the slurry, namely mixing the raw materials to obtain the slurry, uniformly coating the stirred slurry on a carbon fiber substrate layer, and coating the slurry by coating equipment during coating to avoid repeated coating;
s4: primary drying, namely drying the substrate layer in drying equipment after the slurry is coated, wherein the drying temperature is in the range of 60-70 ℃, and the drying time is 50min;
s5: coating for the second time, namely coating the slurry on the first microporous layer again after the first microporous layer is cooled to room temperature after the drying is finished, and forming a second microporous layer after the slurry is coated;
and S6, secondary drying, namely placing the second microporous layer in drying equipment, drying the second microporous layer at the temperature of over 400 ℃, directly taking out the dried second microporous layer after drying, and then cooling the second microporous layer to normal temperature to prepare the gas diffusion layer.
In the invention, the mixed solvent is mainly water or ethylene glycol, the sequence of injecting the raw materials into the mixing container needs to be strictly controlled in the process of mixing the raw materials, so that the raw materials can be uniformly mixed, the hydrophobic material is one of PTF, PDDA and FEP, and the conductive carbon black is one of graphitized carbon and superconducting carbon black.
In conclusion, the secondary drying temperature is within the range of 200 ℃ to 250 ℃, the resistance of the contact resistor is the largest, the resistance is the lowest within the range of 300 ℃ to 350 ℃, and the conductivity of the gas diffusion layer is improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. A fuel cell gas diffusion layer comprising a substrate layer having a first microporous layer disposed thereon and a second microporous layer disposed thereon.
2. The fuel cell gas diffusion layer according to claim 1, wherein the substrate layer is a carbon fiber substrate layer, and the raw material of the microporous layer comprises a hydrophobic material, conductive carbon black, and a mixed solvent.
3. The method of making a gas diffusion layer for a fuel cell of claim 1, comprising the steps of:
s1: preparing raw materials; preparing proper amount of conductive carbon black, hydrophobic material and mixed solvent,
s2: mixing raw materials, preparing a mixing container, injecting a mixed solvent, conductive carbon black and a hydrophobic material into the container according to a certain proportion, during injection, firstly injecting the conductive carbon black, then adding a proper amount of the mixed solvent, stirring for 5min, then injecting the hydrophobic material, then adding a proper amount of the mixed solvent, and uniformly stirring for 30min;
s3: coating the slurry, namely mixing the raw materials to obtain the slurry, uniformly coating the stirred slurry on a carbon fiber substrate layer, and coating the slurry by coating equipment during coating to avoid repeated coating;
s4: primary drying, namely after the slurry is coated, placing the substrate layer in drying equipment for drying, wherein the drying temperature is within the range of 60-70 ℃, and the drying time is 50min;
s5: coating for the second time, namely coating the slurry on the first microporous layer again after the first microporous layer is cooled to the room temperature after the drying is finished, and forming a second microporous layer after the slurry is coated;
and S6, secondary drying, namely placing the second microporous layer in drying equipment, controlling the temperature to be more than 200 ℃ to dry the second microporous layer, directly taking out the second microporous layer after drying is finished, and then cooling the second microporous layer to be placed at normal temperature to obtain the gas diffusion layer.
4. The method of manufacturing a gas diffusion layer for a fuel cell according to claim 3, wherein the mixed solvent is mainly water or ethylene glycol.
5. The method for preparing a gas diffusion layer of a fuel cell according to claim 3, wherein the order of injecting the raw materials into the mixing vessel is strictly controlled during the raw material mixing process, so as to ensure uniform mixing of the raw materials.
6. The method of claim 3, wherein the hydrophobic material is one of PTF, PDDA and FEP, and the conductive carbon black is one of graphitized carbon and superconductive carbon black.
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| CN117117209A (en) * | 2023-10-24 | 2023-11-24 | 国家电投集团氢能科技发展有限公司 | Gas diffusion layer and preparation method and application thereof |
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| CN117117209A (en) * | 2023-10-24 | 2023-11-24 | 国家电投集团氢能科技发展有限公司 | Gas diffusion layer and preparation method and application thereof |
| CN117117209B (en) * | 2023-10-24 | 2024-02-09 | 国家电投集团氢能科技发展有限公司 | Gas diffusion layer and preparation method and application thereof |
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