CN106898791B - A kind of fuel battery gas diffusion layer and preparation method thereof by electrochemical method surface modification - Google Patents

A kind of fuel battery gas diffusion layer and preparation method thereof by electrochemical method surface modification Download PDF

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CN106898791B
CN106898791B CN201710173554.5A CN201710173554A CN106898791B CN 106898791 B CN106898791 B CN 106898791B CN 201710173554 A CN201710173554 A CN 201710173554A CN 106898791 B CN106898791 B CN 106898791B
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carbon paper
gas diffusion
electrode
diffusion layer
fuel battery
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CN106898791A (en
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李赏
刘畅
王志昌
潘牧
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Wuhan University of Technology WUT
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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
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0204—Non-porous and characterised by the material
    • H01M8/0223—Composites
    • H01M8/0228—Composites in the form of layered or coated products
    • 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
    • H01M8/0234—Carbonaceous material
    • 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
    • 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

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Abstract

The invention discloses a kind of fuel battery gas diffusion layers and preparation method thereof by electrochemical method surface modification, the gas diffusion layers include carbon paper substrate and microporous layers, the carbon paper substrate passes through electrochemical method surface modification, polyaniline with good conductivity is deposited on its surface, one layer of unique porous network structure is formd by high-temperature heat treatment, the porous network structure can substantially improve the water management capabilities of fuel cell at higher current densities and mass transfer ability, improve fuel cell output performance.

Description

A kind of fuel battery gas diffusion layer and its system by electrochemical method surface modification Preparation Method
Technical field
The present invention relates to field of fuel cell technology, and in particular to a kind of fuel electricity by electrochemical method surface modification Pond gas diffusion layers and preparation method thereof.
Background technique
The chemical energy being stored in fuel and oxidant is directly converted into electric energy by fuel battery energy, since it is with energy The features such as density is high, and starting is fast, Zero-discharge non-pollution, therefore become the hot spot of countries nowadays research.The core of fuel cell Part --- MEA (Membrane Electrode Assemblies) is passed through by Catalytic Layer, proton exchange membrane and gas diffusion layers Heat pressing process is prepared.
Gas diffusion layers are mainly made of conductive porous material, and effect is support Catalytic Layer, stablizes electrode structure simultaneously Have the effects that transmit gas, discharge water, is one of the critical component for influencing electrode performance.Ideal gas diffusion layers should have Good electric conductivity, good drainage and good gas permeability.Gas diffusion layers are usually made of basal layer and microporous layers.It is micro- Aperture layer is usually made of conductive black and hydrophober, and thickness is about 10~100 μm, and effect is reduced between Catalytic Layer and supporting layer Contact resistance, so that reaction gas and the water of generation is realized uniform reallocation between flow field and Catalytic Layer, be conducive to enhancing and lead Electrically, electrode performance is improved.Basal layer is usually porous carbon paper or carbon cloth, and thickness is about 100~400 μm, and effect is branch Support microporous layers and Catalytic Layer.
The cost and endurance issues of fuel cell are still the key factor for hindering it further to apply.Improve fuel electricity Pond power density can allow the fuel cell of unit area to export more power, not only can significantly promote fuel cell and compare function Rate density can also reduce membrane electrode usage amount, reduce cost.Therefore, high with the gradually development of fuel cell car technology Power density fuel cell technology more and more attention has been paid to.The end of the year 2014, Japanese Toyota Company release commercialization fuel cell electricity Motor-car " MIRAI ", output power reach 114KW, and power density reaches 3.1KW/L, and it is defeated to create the single pile of fuel cell Power and the new world record of power density two indices out.Later, Japanese honda company and German Benz Co. released respectively Fuel cell passenger car " Clarity " and fuel battery passenger car " Citaro ", the output power of the single pile of fuel cell and Power density is it is said that reach Toyota " MIRAI " same level.
High power density means High Output Current density.Improving fuel cell pile power density, there are mainly two types of realize Mode: 1. reduce the bipolar plate thickness of pile, reduce battery volume；2, accelerate electrochemical reaction process, improve output current density. Fuel cell pile mainly uses metal double polar plates at present, and the plate thickness of metal double polar plates has reduced to 0.1mm, flows simultaneously Road depth also has been reduced to 0.3~0.4mm, it means that the space for being further reduced thickness is very limited.Therefore pass through quickening Electrochemical reaction process improves the main direction of development that output current density is raising power density.Currently, using Toyota as representative International Fuel Cell technology have reached 2.4~3.0A/cm2The technical level of 0.5~0.6V of@.And at home, if real The target (the year two thousand thirty reaches volumetric specific power 4.0Kw/L) of existing fuel cell car way for development line chart planning, current density is necessary Reach 3.0A/cm2Left and right.Therefore, the output current density of fuel cell is needed from current 1.0~1.5A/cm2, it is increased to 2.5 ~3.0A/cm2, it is enhanced about more than once relative to current level.Also need to improve fuel battery gas diffusion layer simultaneously in high electricity Water management capabilities under current density.Therefore, finding a kind of method and making fuel cell at higher current densities has good mass transfer Ability and water management capabilities improve the output performance of fuel cell, are of great significance.
Summary of the invention
The purpose of the present invention is to provide a kind of fuel battery gas diffusion layer of function admirable, in the gas diffusion layers Carbon paper substrate passes through electrochemical method surface modification mistake, is deposited with polyaniline with good conductivity on its surface, warms by height Processing forms unique reticular structure, the structure can substantially improve the water management capabilities of fuel cell at higher current densities with Mass transfer ability improves the output performance of fuel cell.To achieve the above object, the technical solution adopted in the present invention is as follows:
A kind of fuel battery gas diffusion layer by electrochemical method surface modification, including basal layer and microporous layers, institute The carbon paper substrate that basal layer is covered by surface by reticulated porous structures substance is stated, the diameter of the reticulated porous structures is 40- 70nm, the microporous layers include conductive black and hydrophober.
According to above scheme, the surface passes through electrochemistry by carbon paper by the carbon paper substrate that reticulated porous structures substance covers Method is heat-treated after its surface deposits polyaniline and is formed.
The preparation method of above-mentioned fuel battery gas diffusion layer, comprising the following steps: it is standby that (a) prepares the electrolyte containing aniline With；(b) three-electrode system is used in prepared electrolyte, polyaniline is electrochemically-deposited in carbon paper surface, deposition is completed Carbon paper afterwards washs drying for standby；(c) carbon paper that deposited polyaniline is heat-treated to obtain surface with reticular structure Carbon paper substrate；(d) upper microporous layers are covered on one side wherein up to fuel battery gas diffusion layer in carbon paper substrate.
According to above scheme, electrolyte is formulated by aniline, perchloric acid and water in step (a), aniline in electrolyte Concentration is 0.1-0.4mol/L, and the concentration of perchloric acid is 0.5-0.8mol/L.
According to above scheme, three-electrode system is using platinum black electrode as to electrode, saturated calomel electrode conduct in step (b) Reference electrode, carbon paper is as working electrode, and voltage scan range 1-3V, sweep speed 50mV/s, scanning circle number is 5-15 Circle, reaction temperature are 10-30 DEG C.
According to above scheme, the carbon paper in step (b) after the completion of deposition is first rinsed 3-5 times with deionized water, then 60 DEG C vacuum drying.
According to above scheme, in step (c) under nitrogen protection, by the carbon paper that deposited polyaniline with 1-5 DEG C/min's Heating rate rises to 700 DEG C~1100 DEG C from room temperature, is heat-treated 2-3h, then cooled to room temperature.
According to above scheme, microporous layers described in step (d) are made of conductive black and hydrophober.
Compared with existing fuel battery gas diffusion layer, the fuel electricity provided by the invention by electrochemical surface modification Pond gas diffusion layers, have the advantage that
(1) test result shows to deposit polyaniline and thermally treated formation, surface through electrochemical method with netted knot The carbon paper substrate of structure, the polarization curve under 100% humidification degree show more smooth, it can be seen that process provided by the invention The fuel battery gas diffusion layer of electrochemical method surface modification greatly improves the water of fuel cell at higher current densities Managerial ability.
(2) it is tested through the performance comparison under high current density, fuel battery gas diffusion layer provided by the invention improves The mass transfer ability of fuel cell at higher current densities.
(3) cell output of fuel cell is improved.It is that 100%, electric current is close in battery testing condition humidification degree Degree is 2100mA/cm2When, the single battery voltage to be formed is assembled up to 0.575V using gas diffusion layers prepared by the present invention, Cell power density is up to 1.21W/cm2, and the voltage of the fuel cell assembled using common commercial gas diffusion layers can only reach To 0.408V, cell power density is only 0.85W/cm2.That is, the combustion provided by the invention by electrochemical method surface modification Material cell gas diffusion layer improves the output performance of fuel cell really.
Detailed description of the invention
Fig. 1 is SEM photograph of the embodiment of the present invention 1 through electrochemical deposition, heat treatment gained carbon paper surface, amplification factor 1 Wan Bei；
Fig. 2 is SEM photograph of the embodiment of the present invention 1 through electrochemical deposition, heat treatment gained carbon paper surface, amplification factor 3 Wan Bei；
Fig. 3 is that the monocell assembled using cathode diffusion layer prepared by the embodiment of the present invention 1 is surveyed in different humidification degree Battery performance comparison diagram under the conditions of examination；
Fig. 4 is the monocell and common commercial gas assembled using cathode diffusion layer prepared by the embodiment of the present invention 1 and 2 The performance comparison figure for the fuel cell that body diffused layer is assembled.
Specific embodiment
To make those of ordinary skill in the art fully understand technical solution of the present invention and beneficial effect, below in conjunction with specific Embodiment is further described.
Embodiment 1
A kind of preparation method of the fuel battery gas diffusion layer by electrochemical method surface modification, including following step It is rapid:
1. the configuration of electrolyte: perchloric acid and aniline being sequentially added in deionized water, electrolyte, benzene in electrolyte are made into The concentration of amine is 0.1-0.4mol/L, and the concentration of perchloric acid is 0.5-0.8mol/L.
2. electrochemical polymerization: in three-electrode system, as working electrode, platinum black electrode is used as to electrode, saturation carbon paper Calomel electrode is as reference electrode.Carbon paper platinum electrode is clamped and is immersed in electrolyte, electrification is carried out using cyclic voltammetry Deposition is learned, voltage range is 1~3V, sweep speed 50mV/s, and scanning circle number is 5 circles, obtains to surface and is deposited with conducting polyaniline The carbon paper of amine.
3. after above-mentioned carbon paper is washed with deionized 3~5 times, being put into vacuum oven at 60 DEG C dry.
4. high-temperature heat treatment: gained carbon paper sample being put into tube furnace, in N2Under atmosphere, the carbon of polyaniline will be deposited Paper rises to 1000 DEG C from room temperature with the heating rate of 1-5 DEG C/min, is heat-treated 2-3h, then cooled to room temperature.Obtain through Electrochemical method modified, surface have the carbon paper substrate of reticular structure.
5. wherein covering one layer of microporous layers on one side in the obtained carbon paper substrate with reticular structure (conductive black and to hate Aqua) cathode gas diffusion layer is used as to get fuel battery gas diffusion layer is arrived.
To further appreciate that the carbon paper microstructure after electrochemical deposition, we have carried out SEM test to it, as a result as schemed (amplification factor is respectively 10,000 times and 30,000 times) shown in 1-2.It can be seen that carbon paper base by the SEM figure of Fig. 1,2 different amplifications Bottom surface is reticular structure, and the diameter of reticular structure is about 40~70nm, and reticular structure is relatively uniform to be distributed in carbon paper table Face.
By above-mentioned cathode diffusion layer and commercial anode gas diffusion layers (Wuhan Wut New Energy Co., Ltd.) and CCM (Wuhan Wut New Energy Co., Ltd.) is assembled into monocell, carries out the next survey of group using HTS-125 type fuel battery test system Examination, battery testing temperature are 80 DEG C, and the relative humidity of hydrogen and air is respectively 100% and 40%~100%, test condition Excess coefficient is 1.5/2.5.Cell testing results are as shown in figure 3, can be seen that gas diffusion layers prepared by the present invention by Fig. 3 Under the conditions of 40%, 70%, 100% humidification degree, humidification degree is higher, and the performance of fuel cell at higher current densities is better；When Humidification degree is 100%, current density 2100mA/cm2When, voltage is up to 0.575V, and cell power density is up to 1.21W/ cm2。
Embodiment 2
A kind of preparation method of the fuel battery gas diffusion layer by electrochemical method surface modification, including following step It is rapid:
1. the configuration of electrolyte: perchloric acid and aniline being sequentially added in deionized water, electrolyte is made into, wherein aniline Concentration is 0.1-0.4mol/L, and the concentration of perchloric acid is 0.5-0.8mol/L.
2. electrochemical polymerization: in three-electrode system, as working electrode, platinum black electrode is used as to electrode, saturation carbon paper Calomel electrode is as reference electrode.Carbon paper platinum electrode is clamped and is immersed in electrolyte, electrification is carried out using cyclic voltammetry Deposition is learned, voltage range is 1~3V, sweep speed 50mV/s, and scanning circle number is 10 circles, obtains to surface and is deposited with conducting polyaniline The carbon paper of amine.
3. after above-mentioned carbon paper is washed with deionized 3~5 times, being put into vacuum oven at 60 DEG C dry.
4. high-temperature heat treatment: gained carbon paper sample being put into tube furnace, in N2Under atmosphere, the carbon of polyaniline will be deposited Paper rises to 1000 DEG C from room temperature with the heating rate of 1-5 DEG C/min, is heat-treated 2-3h, then cooled to room temperature.Obtain through Electrochemical method modified, surface have the carbon paper substrate of reticular structure.
5. wherein covering one layer of microporous layers on one side in the obtained carbon paper substrate with reticular structure (conductive black and to hate Aqua) cathode diffusion layer is used as to get fuel battery gas diffusion layer is arrived.
Using same method, by above-mentioned cathode diffusion layer, (Wuhan science and engineering new energy has with commercial anode gas diffusion layers Limit company) and CCM (Wuhan Wut New Energy Co., Ltd.) be assembled into monocell and tested, battery testing temperature be 80 DEG C, the relative humidity of hydrogen and air is respectively 100% and 40%~100%, and the excess coefficient of test condition is 1.5/2.5. It is 100% in battery testing condition humidification degree, current density 2100mA/cm2When, the voltage of embodiment 2 up to 0.562V, Cell power density is up to 1.18W/cm2。
Embodiment 3
A kind of preparation method of the fuel battery gas diffusion layer by electrochemical method surface modification, including following step It is rapid:
1. the configuration of electrolyte: perchloric acid and aniline being sequentially added in deionized water, wiring solution-forming, wherein aniline is dense Degree is 0.1-0.4mol/L, and the concentration of perchloric acid is 0.5-0.8mol/L.
2. electrochemical polymerization: in three-electrode system, as working electrode, platinum black electrode is used as to electrode, saturation carbon paper Calomel electrode is as reference electrode.Carbon paper platinum electrode is clamped and is immersed in electrolyte, electrification is carried out using cyclic voltammetry Deposition is learned, voltage range is 1~3V, sweep speed 50mV/s, and scanning circle number is 15 circles, obtains to surface and is deposited with conducting polyaniline The carbon paper of amine.
3. after above-mentioned carbon paper is washed with deionized 3~5 times, being put into vacuum oven at 60 DEG C dry.
4. high-temperature heat treatment: gained carbon paper sample being put into tube furnace, in N2Under atmosphere, the carbon of polyaniline will be deposited Paper rises to 1000 DEG C from room temperature with the heating rate of 1-5 DEG C/min, is heat-treated 2-3h, then cooled to room temperature.Obtain through Electrochemical method modified, surface have the carbon paper substrate of reticular structure.
5. wherein covering one layer of microporous layers on one side in the obtained carbon paper substrate with reticular structure (conductive black and to hate Aqua) cathode diffusion layer is used as to get fuel battery gas diffusion layer is arrived.
Embodiment 4
A kind of preparation method of the fuel battery gas diffusion layer by electrochemical method surface modification, including following step It is rapid:
1. the configuration of electrolyte: perchloric acid and aniline being sequentially added in deionized water, electrolyte is made into, wherein aniline Concentration is 0.1-0.4mol/L, and the concentration of perchloric acid is 0.5-0.8mol/L.
2. electrochemical polymerization: in three-electrode system, as working electrode, platinum black electrode is used as to electrode, saturation carbon paper Calomel electrode is as reference electrode.Carbon paper platinum electrode is clamped and is immersed in electrolyte, electrification is carried out using cyclic voltammetry Deposition is learned, voltage range is 1~3V, sweep speed 50mV/s, and scanning circle number is 5 circles, obtains to surface and is deposited with conducting polyaniline The carbon paper of amine.
3. after above-mentioned carbon paper is washed with deionized 3~5 times, being put into vacuum oven at 60 DEG C dry.
4. high-temperature heat treatment: gained carbon paper sample being put into tube furnace, in N2Under atmosphere, the carbon of polyaniline will be deposited Paper rises to 800 DEG C from room temperature with the heating rate of 1-5 DEG C/min, is heat-treated 2-3h, then cooled to room temperature.It obtains through electricity Chemical method modified, surface have the carbon paper substrate of reticular structure.
5. wherein covering one layer of microporous layers on one side in the obtained carbon paper substrate with reticular structure (conductive black and to hate Aqua) cathode diffusion layer is used as to get fuel battery gas diffusion layer is arrived.
Embodiment 5
A kind of preparation method of the fuel battery gas diffusion layer by electrochemical method surface modification, including following step It is rapid:
1. the configuration of electrolyte: perchloric acid and aniline being sequentially added in deionized water, electrolyte is made into, wherein aniline Concentration is 0.1-0.4mol/L, and the concentration of perchloric acid is 0.5-0.8mol/L.
2. electrochemical polymerization: in three-electrode system, as working electrode, platinum black electrode is used as to electrode, saturation carbon paper Calomel electrode is as reference electrode.Carbon paper platinum electrode is clamped and is immersed in electrolyte, electrification is carried out using cyclic voltammetry Deposition is learned, voltage range is 1~3V, sweep speed 50mV/s, and scanning circle number is 10 circles, obtains to surface and is deposited with conducting polyaniline The carbon paper of amine.
3. after above-mentioned carbon paper is washed with deionized 3~5 times, being put into vacuum oven at 60 DEG C dry.
4. high-temperature heat treatment: gained carbon paper sample being put into tube furnace, in N2Under atmosphere, the carbon of polyaniline will be deposited Paper rises to 800 DEG C from room temperature with the heating rate of 1-5 DEG C/min, is heat-treated 2-3h, then cooled to room temperature.It obtains through electricity Chemical method modified, surface have the carbon paper substrate of reticular structure.
5. wherein covering one layer of microporous layers on one side in the obtained carbon paper substrate with reticular structure (conductive black and to hate Aqua) cathode diffusion layer is used as to get fuel battery gas diffusion layer is arrived.
Embodiment 6
A kind of preparation method of the fuel battery gas diffusion layer by electrochemical method surface modification, including following step It is rapid:
1. the configuration of electrolyte: perchloric acid and aniline being sequentially added in deionized water, electrolyte is made into, wherein aniline Concentration is 0.1-0.4mol/L, and the concentration of perchloric acid is 0.5-0.8mol/L.
2. electrochemical polymerization: in three-electrode system, as working electrode, platinum black electrode is used as to electrode, saturation carbon paper Calomel electrode is as reference electrode.Carbon paper platinum electrode is clamped and is immersed in electrolyte, electrification is carried out using cyclic voltammetry Deposition is learned, voltage range is 1~3V, sweep speed 50mV/s, and scanning circle number is 15 circles, obtains to surface and is deposited with conducting polyaniline The carbon paper of amine.
3. after above-mentioned carbon paper is washed with deionized 3~5 times, being put into vacuum oven at 60 DEG C dry.
4. high-temperature heat treatment: gained carbon paper sample being put into tube furnace, in N2Under atmosphere, the carbon of polyaniline will be deposited Paper rises to 800 DEG C from room temperature with the heating rate of 1-5 DEG C/min, is heat-treated 2-3h, then cooled to room temperature.It obtains through electricity Chemical method modified, surface have the carbon paper substrate of reticular structure.
5. wherein covering one layer of microporous layers on one side in the obtained carbon paper substrate with reticular structure (conductive black and to hate Aqua) cathode diffusion layer is used as to get fuel battery gas diffusion layer is arrived.
Comparative example 1
Common commercial gas diffusion layers are respectively adopted as cathode and anode (anode keeps identical as previous embodiment), with CCM (Wuhan Wut New Energy Co., Ltd.) is assembled into battery and carries out identical test, and battery testing temperature is 80 DEG C, hydrogen and The relative humidity of air is respectively 100% and 40%~100%, and the excess coefficient of test condition is 1.5/2.5.Test result is such as Shown in Fig. 4, as can be seen from Figure 4: embodiment 1 is that 100%, electric current is close in battery testing condition humidification degree compared with comparative example 1 Degree is 2100mA/cm2When, the voltage of embodiment 1 is up to 0.575V, and cell power density is up to 1.21W/cm2, and comparative example Voltage can only achieve 0.408V, cell power density is only 0.85W/cm2.It can be seen that the battery performance of embodiment 1 is obvious It is better than the battery performance of comparative example 1.From Fig. 4 it can also be seen that the battery performance of embodiment 2 is also significantly better than comparative example 1, in electricity Pond test condition humidification degree is 100%, and current density is 2100mA/cm2When, the voltage of embodiment 2 is up to 0.562V, electricity Pond power density is up to 1.18W/cm2.It can be seen that the fuel cell provided by the invention by electrochemical method surface modification Gas diffusion layers improve the comprehensive performance of fuel cell really.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much The change of form, all of these belong to the protection of the present invention.

Claims (4)

1. a kind of preparation method of the fuel battery gas diffusion layer by electrochemical method surface modification, which is characterized in that packet Include following steps:
(a) it is spare to prepare the electrolyte containing aniline；
(b) three-electrode system is used in prepared electrolyte, polyaniline is electrochemically-deposited in carbon paper surface, deposition is completed Carbon paper afterwards washs drying for standby；
(c) carbon paper that deposited polyaniline is heat-treated to obtain the carbon paper substrate that surface has reticulated porous structures；
(d) upper microporous layers are covered on one side wherein up to fuel battery gas diffusion layer in carbon paper substrate；
Wherein, electrolyte is formulated by aniline, perchloric acid and water in step (a), and the concentration of aniline is 0.1- in electrolyte 0.4mol/L, the concentration of perchloric acid are 0.5-0.8mol/L；In step (c) under nitrogen protection, the carbon of polyaniline will be deposited Paper rises to 700 DEG C -1100 DEG C from room temperature with the heating rate of 1-5 DEG C/min, is heat-treated 2-3h, then cooled to room temperature.
2. a kind of preparation of fuel battery gas diffusion layer by electrochemical method surface modification according to claim 1 Method, it is characterised in that: three-electrode system is using platinum black electrode as to electrode in step (b), and saturated calomel electrode is as reference Electrode, carbon paper are 5-15 circle as working electrode, voltage scan range 1-3V, sweep speed 50mV/s, scanning circle number, instead Answering temperature is 10-30 DEG C.
3. a kind of preparation of fuel battery gas diffusion layer by electrochemical method surface modification according to claim 1 Method, it is characterised in that: the carbon paper in step (b) after the completion of electrochemical deposition is first rinsed 3-5 times with deionized water, then 60 DEG C vacuum drying.
4. a kind of preparation of fuel battery gas diffusion layer by electrochemical method surface modification according to claim 1 Method, it is characterised in that: microporous layers described in step (d) are made of conductive black and hydrophober.
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JP6786569B2 (en) * 2018-11-09 2020-11-18 本田技研工業株式会社 A method of forming a gas diffusion layer on carbon paper used in a fuel cell, and a carbon paper on which a gas diffusion layer used in a fuel cell is formed.
CN112701299A (en) * 2020-12-29 2021-04-23 一汽解放汽车有限公司 Gas diffusion layer of fuel cell and preparation method and application thereof

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