CN111129507B - Gas diffusion layer for fuel cell and preparation method and application thereof - Google Patents

Gas diffusion layer for fuel cell and preparation method and application thereof Download PDF

Info

Publication number
CN111129507B
CN111129507B CN201911282347.9A CN201911282347A CN111129507B CN 111129507 B CN111129507 B CN 111129507B CN 201911282347 A CN201911282347 A CN 201911282347A CN 111129507 B CN111129507 B CN 111129507B
Authority
CN
China
Prior art keywords
gas diffusion
diffusion layer
hydrophilic
fuel cell
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201911282347.9A
Other languages
Chinese (zh)
Other versions
CN111129507A (en
Inventor
林瑞
陈亮
唐圣濠
董梦成
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tongji University
Original Assignee
Tongji University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tongji University filed Critical Tongji University
Priority to CN201911282347.9A priority Critical patent/CN111129507B/en
Publication of CN111129507A publication Critical patent/CN111129507A/en
Application granted granted Critical
Publication of CN111129507B publication Critical patent/CN111129507B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/1004—Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]
    • 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

Abstract

The invention relates to a gas diffusion layer for a fuel cell, a preparation method and application thereof. The hydrophilic region is a hydrophilic membrane structure formed by self-assembly of hydrophilic small molecules in the gas diffusion layer, the thickness of the membrane structure depends on the diameter of the small molecules, and the hydrophilic capability depends on the strength of hydrophilic groups contained in the small molecules. The hydrophilic region extends through at least a portion of the entire gas diffusion layer thickness. The coordination structure of the hydrophilic and hydrophobic areas in the gas diffusion layer can be adjusted according to different working condition requirements, and the adjustment and control can simultaneously meet the structural design of planes and depths.

Description

Gas diffusion layer for fuel cell and preparation method and application thereof
Technical Field
The invention relates to the field of fuel cells, in particular to a gas diffusion layer for a fuel cell and a preparation method and application thereof.
Background
The fuel cell is an energy conversion device which directly converts chemical energy into electric energy, has the advantages of high energy density, high utilization rate, cleanness, quietness and the like, and is a high-efficiency energy conversion device. The proton exchange membrane fuel cell is composed of a proton exchange membrane, a cathode and anode catalyst layer and a gas diffusion layer, wherein the gas diffusion layer can be further divided into a support layer and a microporous layer. The hydrogen is converted into protons and electrons under the action of the anode catalyst, the protons reach the cathode through the proton exchange membrane, and the electrons reach the cathode through an external circuit. After oxygen enters the cathode diffusion layer, electrons are obtained under the action of a cathode catalyst and react with protons to generate water.
Since proton conductivity is directly related to water content, the proton exchange membrane of a fuel cell must contain sufficient water in an operating state. However, if the water content in the fuel cell is too high, flooding may occur, which may prevent the gas from entering the catalytic layer and prevent the cell reaction from proceeding. Efficient water management of the fuel cell is necessary to enable the fuel cell to accommodate a wide range of humidity conditions.
In order to solve the above problems, chinese patent 201280074792.6 proposes a preparation scheme of a membrane electrode assembly. Wherein the microporous layer ink comprises a suspension medium, a first carbon black having a carboxyl group concentration of less than 0.1mol per gram of carbon, a hydrophobic additive, and a hydrophilic additive. The hydrophilic additive is selected from the group consisting of tin oxide, titanium dioxide, and a second carbon black having a greater concentration of carboxyl groups than the first carbon black. And it was found that at high temperature conditions, the hydrophilic additive enhanced the hydration level of the catalyst layer ionomer, thereby improving conductivity and oxygen transport through the ionomer membrane. At low temperature conditions, the hydrophilic additive helps to quickly draw moisture out of the catalyst pores, thereby improving the oxygen transfer rate in the catalytic layer. This solution does achieve the water balance effect by using a hydrophilic oxide as an additive, but the oxide has poor conductivity, which results in an increase in the impedance of the fuel cell as a whole, resulting in a decrease in the performance of the fuel cell. Meanwhile, after long-time working condition operation, the oxide is easy to shift or fall off, so that the durability of the battery is rapidly reduced.
Chinese patent 200610167389.4 proposes a fuel cell membrane electrode, which comprises an anode gas diffusion layer, an anode catalyst layer, a proton exchange membrane, a cathode catalyst layer and a cathode gas diffusion layer in sequence, wherein the gas diffusion layer comprises a conductive carrier, and a conductive agent and an adhesive loaded on the conductive carrier, wherein the adhesive in the anode gas diffusion layer is a hydrophilic adhesive, specifically a sulfonic acid resin or a fluorinated sulfonic acid resin. Similarly to the above patent, the polymer resin used as the hydrophilic substance also causes problems of increased resistance and decreased durability.
Disclosure of Invention
The invention aims to solve the problems and provide a gas diffusion layer for a fuel cell and a preparation method and application thereof.
The purpose of the invention is realized by the following technical scheme:
a gas diffusion layer for a fuel cell, which gas diffusion layer has been subjected to a hydrophobic treatment and thereafter has imparted thereto a shape-controllable hydrophilic region which passes through at least a part of the thickness of the entire gas diffusion layer.
The hydrophilic region is a hydrophilic membrane structure formed by self-assembly of hydrophilic small molecules in the gas diffusion layer, the thickness of the hydrophilic membrane structure depends on the diameter of the small molecules, and the hydrophilic capacity depends on the strength of hydrophilic groups contained in the small molecules. The coordination structure of the hydrophilic and hydrophobic areas in the gas diffusion layer can be adjusted according to different working condition requirements, and the adjustment and control can simultaneously meet the structural design of planes and depths.
Preferably, the hydrophobic treatment is one or more of soaking the support layer of the gas diffusion layer with a hydrophobic agent, adding a hydrophobic agent to a microporous layer of the gas diffusion layer, or reducing the pore size of the microporous layer.
Preferably, the hydrophobic agent is selected from one or more of polytetrafluoroethylene, fluorinated ethylene propylene copolymer, polyvinylidene fluoride emulsion or polyhexafluoropropylene emulsion.
Preferably, the hydrophilic small molecule is selected from one or more of isopropyl tris (dioctylphosphato) titanate, gamma-glycidoxypropyltrimethoxysilane, isopropyldioleaato (dioctylphosphato) titanate or gamma-methacryloxypropyltrimethoxysilane.
Preferably, the hydrophilic small molecules realize self-assembly on the surface of carbon powder in the gas diffusion layer, and form an ultrathin hydrophilic membrane structure inside the gas diffusion layer.
Preferably, the hydrophilic small molecules are coated on the gas diffusion layer by a precursor solution.
Preferably, the form of application comprises one or more of manual painting, mechanical programming or screen printing.
A preparation method of a gas diffusion layer for a fuel cell, the gas diffusion layer is subjected to hydrophobic treatment, and hydrophilic areas are coated on the gas diffusion layer subjected to the hydrophobic treatment, and the hydrophilic areas are coated by adopting the following steps:
(1) taking a mixed solution of deionized water and ethanol as a solvent, wherein the deionized water accounts for 5-50% of the mass of the mixed solution, and adjusting the pH value of the mixed solution to 2-6;
(2) putting hydrophilic micromolecules into the mixed solution, and stirring to obtain a precursor solution of a hydrophilic region, wherein the mass ratio of the hydrophilic micromolecules is 0.5-2%;
(3) and coating a hydrophilic area on the gas diffusion layer, and drying at the temperature of 100-130 ℃ to obtain the gas diffusion layer for the fuel cell.
Performing hydrophobic treatment on the gas diffusion layer, and specifically comprising the following steps:
for the hydrophobic treatment of the gas diffusion layer only with the support layer, one or more of polytetrafluoroethylene, fluorinated ethylene propylene copolymer, polyvinylidene fluoride emulsion or polyhexafluoropropylene emulsion is used as a hydrophobic agent to soak the support layer of the gas diffusion layer;
for the hydrophobic treatment of the gas diffusion layer with the support layer and the microporous layer, the ratio of the conductive carbon black to the hydrophobic agent is 4-5: 1, preparing a microporous layer of a gas diffusion layer.
The gas diffusion layer for the fuel cell is used for preparing the fuel cell.
The invention uses functional micromolecules to realize self-assembly on the surface of carbon powder in the gas diffusion layer, thereby forming an ultrathin hydrophilic membrane structure inside the gas diffusion layer. Particularly, hydrophilic small molecules with special structures are preferred, and the small molecules can form stable valence bonds with the surface of an inorganic substance, so that stronger interlinkage property and durability are achieved. Meanwhile, the small molecules can form chemical bonds with each other under certain conditions, so that a membrane structure is formed on the surface of the inorganic substance. In addition, the small molecular structure also contains hydrophilic groups, so that the membrane structure obtains hydrophilicity. The actual hydrophilic capacity of the hydrophilic region is determined by the magnitude of the affinity of the hydrophilic group for water. Since the hydrophilic membrane exists only in the molecular scale, the original structure of the gas diffusion layer is not impacted, and thus the original conductivity and air permeability of the gas diffusion layer are maintained, and the schematic diagram of the structure of the hydrophilic membrane is shown in fig. 9.
The preparation of the hydrophilic membrane is carried out after the gas diffusion layer is subjected to hydrophobic treatment, so that the loading of the hydrophilic membrane can be flexibly and controllably adjusted quickly and flexibly according to different gas flow channel designs and actual operation conditions in the fuel cell. The specific design scheme of the hydrophilic area can be used for carrying out prejudgment by means of simulation and then carrying out coating. By adjusting the amount of small molecules in the coating process, the depth of the parent region can be regulated and controlled, so that the spatial structure of the hydrophilic region can be controlled.
Compared with the prior art, the invention has the characteristics and beneficial effects that:
(1) the hydrophobic treatment and the hydrophilic structure design of the gas diffusion layer are independent, so that the impact on the stability of slurry caused by adding a hydrophobic agent and a hydrophilic agent simultaneously in the preparation process of slurry of the support layer and the microporous layer of the gas diffusion layer is avoided, the workload required by slurry optimization is greatly reduced, and the potential agglomeration risk of the hydrophobic agent and the hydrophilic agent is avoided.
(2) The hydrophilic region is a hydrophilic membrane structure formed by self-assembly of small molecules in the gas diffusion layer, so that the defects of resistance increase, durability reduction and the like caused by adding materials such as traditional oxides, organic matters and the like are overcome.
(3) The preparation of the hydrophilic membrane is carried out after the gas diffusion layer is subjected to hydrophobic treatment, so the coordination structure of the hydrophilic hydrophobic area can carry out rapid, flexible and controllable adjustment according to different gas flow channel designs and actual operation conditions in the fuel cell, and the adjustment and control can simultaneously meet the structural design of planes and depths.
(4) Under the low-humidification working condition, the hydrophilic region can actively absorb water generated by the fuel cell and is used for wetting the proton exchange membrane, so that the reduction of proton conductivity of the proton exchange membrane due to dehydration is avoided; under the high humidification working condition, the hydrophilic area can be used as a preferential discharge channel of water, so that redundant water is discharged out of the battery, and the battery is prevented from being flooded.
(5) The gas diffusion layer without the modification of the hydrophilic region still retains higher hydrophobicity and gas permeability. Therefore, the gas diffusion layer can be divided into different hydrophilic and hydrophobic functional areas, and a practical basis is provided for optimizing the performance of the fuel cell by multi-physical field coupling.
Drawings
FIG. 1 is a graph of a contact test of liquid water after a gas diffusion layer is coated with hydrophilic regions;
FIG. 2 is a scanning electron micrograph and elemental analysis of the hydrophilic region of example 2;
FIG. 3 is a plan view (depth not penetrated) of the hydrophilic region adopted in examples 1 and 2;
FIG. 4 is a plan design (deep penetration) of hydrophilic areas taken in examples 3, 4;
FIG. 5 is a plan design (deep penetration) of hydrophilic areas taken in examples 5, 6;
fig. 6 is a polarization curve (RH 35%) for examples 1-6 under low humidification conditions;
fig. 7 is a polarization curve (RH 100%) under high humidification conditions for examples 1-6;
FIG. 8 is a comparison of current densities at 0.4V for examples 1-6;
fig. 9 is a schematic view of the structure of the hydrophilic membrane.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
And (3) hydrophobic treatment: soaking a supporting layer of the gas diffusion layer by using polytetrafluoroethylene as a hydrophobic agent; the microporous layer of the gas diffusion layer was prepared with a ratio of conductive carbon black to hydrophobic agent of 5: 1.
Hydrophilic structure design: the selected small molecule is isopropyl tri (dioctyl pyrophosphato acyloxy) titanate, the design of the hydrophilic region is shown in figure 3, and the preparation method of the hydrophilic region comprises the following steps:
a) taking a mixed solution of deionized water and ethanol as a solvent, wherein the deionized water accounts for 5% of the mixed solution by mass;
b) adjusting the pH value of the mixed solution to 6;
c) putting micromolecules for self-assembling hydrophilic regions into the mixed solution, and stirring for 20 minutes to obtain a precursor solution of the hydrophilic regions, wherein the mass ratio of the micromolecules is 1%;
d) and coating a hydrophilic area on the gas diffusion layer, and drying at the temperature of 100 ℃ to obtain the gas diffusion layer with the hydrophilic-hydrophobic coordination structure for the fuel cell.
And (3) assembling and testing the prepared gas diffusion layer by using a membrane electrode. Commercial catalyst/membrane composite (CCM, new energy wuhan-smith limited) parameters used: the thickness of the proton exchange membrane is 15 mu m, and the loading capacity of the anode catalyst (Pt/C) is 0.1mg cm-2Cathode catalyst (Pt/C) loading 0.4mg cm-2. And (3) testing conditions are as follows: introducing hydrogen and air in a metering ratio of 1.5: 2.8; the back pressure of the cathode and the anode is 0.3 bar; the battery testing temperature is 80 ℃; pre-activation for 4 hours before polarization curve testing. The results of the polarization curve tests are shown in FIGS. 6 and 7, and under the condition that the cathode and the anode adopt 35% humidification, the voltage of 0.4V can obtain 1.85A cm-2(ii) a Under the condition that the cathode and the anode adopt 100 percent of humidification working condition, the voltage of 0.4V can obtain 2.15A cm-2。
Example 2
And (3) hydrophobic treatment: soaking a supporting layer of the gas diffusion layer by using polytetrafluoroethylene as a hydrophobic agent; the microporous layer of the gas diffusion layer was prepared with a ratio of conductive carbon black to hydrophobic agent of 4: 1.
Hydrophilic structure design: the selected small molecule is gamma-epoxypropyloxypropyltrimethoxysilane, the hydrophilic region is designed as shown in figure 3, and the preparation method of the hydrophilic region comprises the following steps:
a) taking a mixed solution of deionized water and ethanol as a solvent, wherein the deionized water accounts for 50% of the mixed solution by mass;
b) adjusting the pH value of the mixed solution to 4;
c) putting micromolecules for self-assembling hydrophilic regions into the mixed solution, and stirring for 10 minutes to obtain a precursor solution of the hydrophilic regions, wherein the mass ratio of the micromolecules is 2%;
d) and coating a hydrophilic area on the gas diffusion layer, and drying at the temperature of 110 ℃ to obtain the gas diffusion layer with the hydrophilic-hydrophobic coordination structure for the fuel cell.
And (3) assembling and testing the prepared gas diffusion layer by using a membrane electrode. The results of the polarization curve tests are shown in FIGS. 6 and 7, and 2.14A cm can be obtained at 0.4V under the condition that the cathode and the anode adopt 35% humidification-2(ii) a Under the condition that the cathode and the anode adopt 100 percent of humidification, the voltage of 0.4V can obtain 2.33A cm-2。
Example 3
And (3) hydrophobic treatment: soaking a support layer of the gas diffusion layer by taking polyvinylidene fluoride as a hydrophobic agent; the microporous layer of the gas diffusion layer was prepared with a ratio of conductive carbon black to hydrophobic agent of 5: 1.
Hydrophilic structure design: the selected small molecule is gamma-methacryloxypropyltrimethoxysilane, the hydrophilic region is designed as shown in figure 4, and the preparation method of the hydrophilic region comprises the following steps:
a) taking a mixed solution of deionized water and ethanol as a solvent, wherein the deionized water accounts for 30% of the mixed solution by mass;
b) adjusting the pH value of the mixed solution to 2;
c) putting micromolecules for self-assembling hydrophilic regions into the mixed solution, and stirring for 30 minutes to obtain a precursor solution of the hydrophilic regions, wherein the mass ratio of the micromolecules is 0.5%;
d) and coating a hydrophilic area on the gas diffusion layer, and drying at the temperature of 130 ℃ to obtain the gas diffusion layer with the hydrophilic-hydrophobic coordination structure for the fuel cell.
And (3) assembling and testing the prepared gas diffusion layer by using a membrane electrode. The results of the polarization curve tests are shown in FIGS. 6 and 7, and 2.10A cm can be obtained at 0.4V under the condition that the cathode and the anode adopt 35% humidification-2(ii) a Under the condition that the cathode and the anode adopt 100 percent of humidification working condition, the voltage of 0.4V can obtain 2.28A cm-2。
Example 4
And (3) hydrophobic treatment: soaking a support layer of the gas diffusion layer by taking polyvinylidene fluoride as a hydrophobic agent; the microporous layer of the gas diffusion layer was prepared with a ratio of conductive carbon black to hydrophobic agent of 4: 1.
Hydrophilic structure design: the selected small molecule is gamma-methacryloxypropyltrimethoxysilane, the hydrophilic region is designed as shown in figure 4, and the preparation method of the hydrophilic region comprises the following steps:
a) taking a mixed solution of deionized water and ethanol as a solvent, wherein the deionized water accounts for 25% of the mixed solution by mass;
b) adjusting the pH value of the mixed solution to 5;
c) putting micromolecules for self-assembling hydrophilic regions into the mixed solution, and stirring for 25 minutes to obtain a precursor solution of the hydrophilic regions, wherein the mass ratio of the micromolecules is 1.5%;
d) and coating a hydrophilic area on the gas diffusion layer, and drying at the temperature of 110 ℃ to obtain the gas diffusion layer with the hydrophilic-hydrophobic coordination structure for the fuel cell.
And (3) assembling and testing the prepared gas diffusion layer by using a membrane electrode. The results of the polarization curve tests are shown in FIGS. 6 and 7, and under the condition that the cathode and the anode adopt 35% humidification, the voltage of 0.4V can obtain 1.77A cm-2(ii) a Under the working condition that the cathode and the anode adopt 100 percent of humidification, the voltage of 0.4V can obtain 2.06A cm-2。
Example 5
And (3) hydrophobic treatment: taking fluorinated ethylene propylene copolymer as a hydrophobic agent, and soaking a support layer of the gas diffusion layer; the microporous layer of the gas diffusion layer was prepared with a ratio of conductive carbon black to hydrophobic agent of 5: 1.
Hydrophilic structure design: the selected small molecule is gamma-epoxypropyloxypropyltrimethoxysilane, the hydrophilic region is designed as shown in figure 5, and the preparation method of the hydrophilic region comprises the following steps:
a) taking a mixed solution of deionized water and ethanol as a solvent, wherein the deionized water accounts for 10% of the mixed solution by mass;
b) adjusting the pH value of the mixed solution to 3;
c) putting micromolecules for self-assembling hydrophilic regions into the mixed solution, and stirring for 10 minutes to obtain a precursor solution of the hydrophilic regions, wherein the mass ratio of the micromolecules is 1%;
d) and coating a hydrophilic area on the gas diffusion layer, and drying at the temperature of 130 ℃ to obtain the gas diffusion layer with the hydrophilic-hydrophobic coordination structure for the fuel cell.
And (3) assembling and testing the prepared gas diffusion layer by using a membrane electrode. The results of the polarization curve tests are shown in FIGS. 6 and 7, and 2.03A cm can be obtained at 0.4V under the condition that the cathode and the anode adopt 35% humidification-2(ii) a Under the condition that the cathode and the anode adopt 100 percent of humidification working condition, the voltage of 0.4V can obtain 2.25A cm-2。
Example 6
And (3) hydrophobic treatment: taking fluorinated ethylene propylene copolymer as a hydrophobic agent to soak a support layer of the gas diffusion layer; the microporous layer of the gas diffusion layer was prepared with a ratio of conductive carbon black to hydrophobic agent of 4: 1.
Hydrophilic structure design: the selected small molecule is isopropyl tri (dioctyl pyrophosphato acyloxy) titanate, the design of the hydrophilic region is shown in figure 5, and the preparation method of the hydrophilic region comprises the following steps:
a) taking a mixed solution of deionized water and ethanol as a solvent, wherein the deionized water accounts for 10% of the mixed solution by mass;
b) adjusting the pH value of the mixed solution to 2;
c) putting micromolecules for self-assembling hydrophilic regions into the mixed solution, and stirring for 20 minutes to obtain a precursor solution of the hydrophilic regions, wherein the mass ratio of the micromolecules is 1%;
d) and coating a hydrophilic area on the gas diffusion layer, and drying at the temperature of 120 ℃ to obtain the gas diffusion layer with the hydrophilic-hydrophobic coordination structure for the fuel cell.
And (3) assembling and testing the prepared gas diffusion layer by using a membrane electrode. The results of the polarization curve tests are shown in FIGS. 6 and 7, and under the condition that the cathode and the anode adopt 35% humidification, the voltage of 0.4V can obtain 1.95A cm-2(ii) a Under the working condition that the cathode and the anode adopt 100 percent of humidification, the voltage of 0.4V can obtain 2.21A cm-2。
By summarizing the test data, as shown in FIG. 8, example 2 achieved the highest current density (2.14A cm each) under both low and high humidification conditions-2，2.33A cm-2) (ii) a Example 3 minimal effect of humidity change (difference 0.18A cm) under low and high humidification conditions-2) (ii) a The hydrophilic region structure design shown in FIG. 5 has the performance output minimally affected by the embodiment variation (embodiment 5 difference 0.22A cm)-2Example 6 Difference 0.26A cm-2)。
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims (9)

1. A gas diffusion layer for a fuel cell, characterized in that the gas diffusion layer is subjected to a hydrophobic treatment, and thereafter, a shape-controllable hydrophilic region is imparted on the gas diffusion layer, the hydrophilic region being a hydrophilic membrane structure formed by self-assembly of hydrophilic small molecules in the gas diffusion layer;
the hydrophilic small molecule is selected from one or more of isopropyl tri (dioctyl pyrophosphato acyloxy) titanate, gamma-epoxypropyltrimethoxy silane, isopropyl dioleate acyloxy (dioctyl phosphate acyloxy) titanate or gamma-methyl acryloyloxypropyltrimethoxy silane.
2. The gas diffusion layer for a fuel cell according to claim 1, wherein the hydrophobic treatment is one or more of soaking a support layer of the gas diffusion layer with a hydrophobic agent, adding a hydrophobic agent to a microporous layer of the gas diffusion layer, or reducing a pore size of the microporous layer.
3. The gas diffusion layer for a fuel cell according to claim 2, wherein the hydrophobic agent is selected from one or more of polytetrafluoroethylene, fluorinated ethylene propylene copolymer, polyvinylidene fluoride emulsion, or polyhexafluoropropylene emulsion.
4. The gas diffusion layer for a fuel cell according to claim 1, wherein the hydrophilic small molecules self-assemble on the surface of carbon powder in the gas diffusion layer and form an ultra-thin hydrophilic membrane structure inside the gas diffusion layer.
5. The gas diffusion layer for a fuel cell according to claim 1, wherein the hydrophilic small molecules are coated on the gas diffusion layer by a precursor solution.
6. The gas diffusion layer for a fuel cell according to claim 5, wherein the coating form comprises one or more of manual painting, mechanical programming, or screen printing.
7. A method for producing a gas diffusion layer for a fuel cell according to claim 1, wherein the gas diffusion layer is subjected to a hydrophobic treatment, and hydrophilic regions are coated on the hydrophobic-treated gas diffusion layer, the hydrophilic region being coated by the steps of:
(1) taking a mixed solution of deionized water and ethanol as a solvent, wherein the deionized water accounts for 5-50% of the mass of the mixed solution, and adjusting the pH value of the mixed solution to 2-6;
(2) putting hydrophilic micromolecules into the mixed solution, and stirring to obtain a precursor solution of a hydrophilic region, wherein the mass ratio of the hydrophilic micromolecules is 0.5-2%;
(3) and coating a hydrophilic area on the gas diffusion layer, and drying at the temperature of 100-130 ℃ to obtain the gas diffusion layer for the fuel cell.
8. The method for producing a gas diffusion layer for a fuel cell according to claim 7, wherein the gas diffusion layer is subjected to a hydrophobic treatment, comprising the steps of:
soaking a support layer of the gas diffusion layer by using one or more of polytetrafluoroethylene, fluorinated ethylene propylene copolymer, polyvinylidene fluoride emulsion or polyhexafluoropropylene emulsion as a hydrophobic agent; and/or the ratio of the conductive carbon black to the hydrophobic agent is 4-5: 1, preparing a microporous layer of a gas diffusion layer.
9. Use of a gas diffusion layer for a fuel cell according to claim 1 for the preparation of a fuel cell.
CN201911282347.9A 2019-12-13 2019-12-13 Gas diffusion layer for fuel cell and preparation method and application thereof Active CN111129507B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911282347.9A CN111129507B (en) 2019-12-13 2019-12-13 Gas diffusion layer for fuel cell and preparation method and application thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911282347.9A CN111129507B (en) 2019-12-13 2019-12-13 Gas diffusion layer for fuel cell and preparation method and application thereof

Publications (2)

Publication Number Publication Date
CN111129507A CN111129507A (en) 2020-05-08
CN111129507B true CN111129507B (en) 2021-02-02

Family

ID=70498677

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911282347.9A Active CN111129507B (en) 2019-12-13 2019-12-13 Gas diffusion layer for fuel cell and preparation method and application thereof

Country Status (1)

Country Link
CN (1) CN111129507B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113422068B (en) * 2021-04-21 2022-09-27 华东理工大学 Gas diffusion layer, preparation method and application thereof and fuel cell
CN113851659B (en) * 2021-12-02 2022-02-15 北京理工大学 Fuel cell gas diffusion layer with hydrophilic and hydrophobic structure and preparation method thereof
CN114824296A (en) * 2022-03-18 2022-07-29 福州大学 Gas diffusion layer with hydrophilic and hydrophobic structures and preparation method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1853303A (en) * 2003-09-18 2006-10-25 3M创新有限公司 Fuel cell gas diffusion layer
CN101582511A (en) * 2008-05-13 2009-11-18 通用汽车环球科技运作公司 Hydrolytically-stable hydrophilic coating for pemfc bipolar plate
CN104140691A (en) * 2013-05-06 2014-11-12 广州奥翼电子科技有限公司 Electrophoresis display particle and preparation method thereof
KR20180035002A (en) * 2016-09-28 2018-04-05 현대자동차주식회사 Fuel Cell

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104885275A (en) * 2012-12-27 2015-09-02 日产自动车株式会社 Membrane electrode assembly and membrane electrode assembly fabrication method
CN105098199B (en) * 2015-06-12 2019-04-12 中国科学院宁波材料技术与工程研究所 A kind of gas diffusion layers, preparation method and a kind of metal-air battery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1853303A (en) * 2003-09-18 2006-10-25 3M创新有限公司 Fuel cell gas diffusion layer
CN101582511A (en) * 2008-05-13 2009-11-18 通用汽车环球科技运作公司 Hydrolytically-stable hydrophilic coating for pemfc bipolar plate
CN104140691A (en) * 2013-05-06 2014-11-12 广州奥翼电子科技有限公司 Electrophoresis display particle and preparation method thereof
KR20180035002A (en) * 2016-09-28 2018-04-05 현대자동차주식회사 Fuel Cell

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Novel hydrophilic and hydrophobic double microporous layer coated gas diffusion layer to enhance performance of polymer electrolyte fuel cells under both low and high humidity";Tatsumi Kitahara等;《Journal of Power Sources》;20130204;第234卷;第130页2实验部分及图1 *

Also Published As

Publication number Publication date
CN111129507A (en) 2020-05-08

Similar Documents

Publication Publication Date Title
CN110323460B (en) Catalyst slurry, preparation method and fuel cell
CN111129507B (en) Gas diffusion layer for fuel cell and preparation method and application thereof
US8148026B2 (en) Multi-layered electrode for fuel cell and method for producing the same
CN111009666A (en) Preparation method of double-layer microporous layer type gas diffusion layer
WO2018113485A1 (en) Membrane electrode of high power density proton exchange membrane fuel cell and preparation method therefor
EP1096587A1 (en) Polymer electrolyte fuel cell
US7910259B2 (en) Anode for fuel cell, manufacturing method thereof, and fuel cell including the same
CN111370717A (en) Cathode catalyst slurry, cathode catalyst layer, membrane electrode and fuel cell
CN112072120B (en) Hydrophilic/hydrophobic membrane electrode relating to ionic liquid
CN112820883B (en) Microporous layer slurry, gas diffusion layer, fuel cell and preparation method
CN114243044B (en) Gas diffusion layer for improving water management capacity of fuel cell and preparation method thereof
CN112952114B (en) Gas diffusion layer and preparation method and application thereof
CN114300702A (en) Fuel cell gas diffusion layer structure containing cerium oxide modified carbon nanofiber and preparation method thereof
CN110739475B (en) Membrane electrode with ultralow oxygen mass transfer resistance
KR102213590B1 (en) Method for fabricating catalyst layer for high durability carbon-based fuel cell, catalyst layer for high durability carbon-based fuel cell fabricated by the method and membrane electrode assembly comprising the same
CN116845253B (en) Method for regulating and controlling three-phase interface of catalytic layer of proton exchange membrane fuel cell
CN113113617A (en) Membrane electrode, fuel cell gas diffusion layer and preparation method thereof
KR20090015891A (en) Electrolyte membrane-electrode assembly for direct methanol fuel cell
CN111725523A (en) Thin-layer hydrophobic fuel cell membrane electrode and preparation method thereof
CN113745551B (en) Anode catalysis layer slurry and preparation method thereof
CN110289438A (en) A kind of preparation method of fuel cell self-humidifying membrane electrode
CN114050273B (en) Modified graphene oxide, composite material, GDL and preparation method thereof
Easton et al. Recent advances with sulfonated silica ceramic carbon electrodes for fuel cells
CN115425239A (en) Preparation method of microporous layer with hydrophobic and air permeability double gradients
CN115036519A (en) Fluorine-doped porous carbon, microporous layer, gas diffusion layer, preparation method and application

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant