CN110504472A - A kind of direct methanol fuel cell membrane electrode and preparation method thereof improving catalyst utilization - Google Patents
A kind of direct methanol fuel cell membrane electrode and preparation method thereof improving catalyst utilization Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/88—Processes of manufacture
- H01M4/8803—Supports for the deposition of the catalytic active composition
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- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
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- H01M4/8825—Methods for deposition of the catalytic active composition
- H01M4/8828—Coating with slurry or ink
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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
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- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/88—Processes of manufacture
- H01M4/8875—Methods for shaping the electrode into free-standing bodies, like sheets, films or grids, e.g. moulding, hot-pressing, casting without support, extrusion without support
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
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- 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]
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Abstract
The invention discloses a kind of direct methanol fuel cell membrane electrodes and preparation method thereof that can be improved catalyst utilization, it is related to field of fuel cell technology, by the method for the invention in prepared fuel cell membrane electrode, microporous layers are double-layer structure, including one layer of outer microporous layers containing hydrophobic polymer and one layer of interior microporous layers containing the polymer with proton conductivity.This double micro cavity layer structures have very high three-phase reaction interface and electrochemical reaction area, and the mass transfer resistance of electrode interior is effectively reduced, and the utilization rate of catalyst are effectively improved, to improve electrode discharge performance and extend the service life of battery.By monocell performance test, preparation method of the present invention prepares membrane electrode and is obviously improved than membrane electrode prepared by conventional method in monomer aspect of performance.
Description
Technical field
The present invention relates to field of fuel cell technology, in particular to a kind of direct methanol that can be improved catalyst utilization
Fuel cell membrane electrode and preparation method thereof.
Background technique
Direct methanol fuel cell (DMFC) is that one kind can be continuously straight by the chemical energy in fuel and oxidant
Switch through the power generator for turning to electric energy, due to its environmental protection, efficient characteristic, causes global extensive attention.Methanol fuel
Battery is directly using methanol or methanol aqueous solution as anode fuel, and oxygen or air are as oxidant.Since it comes with methanol
Source is extensive, easy to carry, and storage, supplement are convenient, and volume and specific energy are high, and structure is simple, woth no need to outer reformer apparatus etc.
Feature, portable power supplies, Small Civil power supply and in terms of have broad application prospects.
Core component of the membrane electrode as direct methanol fuel cell, directly determines the performance of battery.However, at present
DMFC has that Methanol Anode electro catalytic activity is not high.It is extremely complex by methanol oxidation mechanism, it can give birth in the process
At some unstable, insoluble intermediate products, certain intermediate products will be adsorbed on the surface of catalyst, it is suppressed that catalysis
The activity of agent causes catalyst poisoning and catalyst utilization low.So research optimization film electrode structure, improves catalyst and utilizes
Rate and electrochemical reaction area etc. are the hot spots of DMFC research.
Most of work concentrates in the modification of catalyst carrier or catalyst layer structure at present, but due to assembling pressure, first
The problem of alcohol flowing, gas flow caused catalyst sinking and the battery performance decline of initiation still has to be solved.When battery is transported
After row a period of time, partial catalyst cannot be withIonomer contact, prevents proton from transmitting, catalyst can not
Work, therefore electrode has biggish electrochemical reaction resistance, and battery performance is caused to decline.In consideration of it, we construct one kind
Novel double micropore layer membrane electrodes.Double microporous layers are by interior microporous layers (addition Nafion polymer) and outer microporous layers (addition PTFE
Polymer) it constitutes.The presence of interior microporous layers can expand the three phase boundary region of reaction, improve the utilization rate of catalyst.
Summary of the invention
The purpose of the present invention is to provide a kind of direct methanol fuel cell membrane electrodes for improving catalyst utilization, thus
Reach and increase three-phase reaction interface and electrochemical surface area, improve catalyst utilization, reduces the electrochemical reaction resistance of electrode
Power and resistance to mass tranfer improve the purpose of monocell performance.
Technical scheme is as follows:
A kind of direct methanol fuel cell membrane electrode can be improved catalyst utilization, including direct methanol fuel cell
Membrane electrode prepares microporous layers on the direct methanol fuel cell membrane electrode, and it includes one that the microporous layers, which have double-layer structure,
Outer microporous layers of the layer containing hydrophobic polymer and one layer of interior microporous layers containing the polymer with proton conductivity；
A kind of preparation method of double micropore layer membrane electrodes, includes the following steps:
Step 1: the processing of gas diffusion layers
Gas diffusion layers are immersed in certain density hydrophobic polymer solution, impregnates -90 seconds 30 seconds, gas is expanded
Scattered layer is placed in oven and dried, and is put into Muffle furnace after gas diffusion layers drying and is sintered, and the gas for obtaining surface hydrophobicity expands
Layer is dissipated, wherein the mass fraction of hydrophobic polymer on the gas diffusion is 20wt.%-40wt.%.
Step 2: the preparation of outer microporous layers
By step 1) obtained in surface hydrophobicity gas diffusion layers even application on contain carbon dust and hydrophobic polymer
Slurry, the carbon paper for spraying spreading mass is put into baking oven drying, after be put into Muffle furnace and be sintered, obtain outer microporous layers, poly- four
Mass fraction of the vinyl fluoride in outer microporous layers is 15wt.%-30wt.%.
Step 3: the preparation of interior microporous layers
By step 2) obtained in carbon dust and the polymer with proton conductivity on outer micropore layer surface even application
Slurry, by the microporous layers for spraying spreading mass be put into baking oven drying, with proton conductivity polymer in interior microporous layers
Mass fraction be 20wt.%-40wt.%, thus to obtain the microporous layers with double-layer structure.
Step 4: the preparation of Catalytic Layer
By step 3) in obtained double-layer structure microporous layers on uniformly coat the catalyst slurry containing proton conductor
Material, catalyst is the Pt/C or PtRu/C that the weight percent of metal is 40wt.%-70wt.%, is put into baking oven and protects after spraying
A period of time is held until drying, that is, obtain the electrode for improving the direct methanol fuel cell of catalyst utilization.
Step 5: the assembling of membrane electrode
By step 4) obtained in raising catalyst utilization direct methanol fuel cell electrode with have ion pass
Lead the proton exchange membrane pressing of ability, pressing pressure 6.0Nm-8.0Nm suppressed at room temperature, without hot pressing to get
To the direct methanol fuel cell membrane electrode for improving catalyst utilization.
Further, step 1) in gas diffusion layers be immersed in the time in hydrophobic polymer be 30~90 seconds, in horse
Not the sintering temperature in furnace is 350-400 degree, and the time is 40~60 minutes.
Further, step 1) in gas diffusion layers be by the removal carbon paper of surface impurity, carbon cloth, nickel foam or
Other materials with conductive capability.
Further, step 1) in hydrophobic polymer be polytetrafluoroethylene (PTFE) or polyvinyl alcohol or polyvinylidene fluoride
Alkene, the mass fraction of hydrophobic polymer on the gas diffusion are 20wt.%~40wt.%.
Further, step 2) in paste composition be carbon dust, hydrophobic polymer, dispersion solvent mixed solution；Its
In, mass fraction of the hydrophobic polymer in outer microporous layers is 15wt.%-30wt.%.
Further, step 3) in paste composition be carbon dust, polymer with proton conductivity, dispersion solvent
Mixed solution, wherein the volume of dispersion solvent is in 5-10ml.
Further, step 3) in proton conductivity polymer be perfluorinated sulfonic acid-polytetrafluoroethylene (PTFE), dispersion
Solvent is isopropanol, ethyl alcohol, acetone；Wherein, mass fraction of the perfluorinated sulfonic acid-polytetrafluoroethylene (PTFE) in interior microporous layers is
20wt.%~40wt.%.
Further, step 4) in anode catalyst be the weight percent of metal be 40wt.%-70wt.%'s
Pt/C or PtRu/C, metal ladings are 2mg cm in anode catalyst layer-2-5mg cm-2；Cathod catalyst is the weight hundred of metal
Divide the Pt/C or PtRu/C than being 40wt.%-70wt.%, metal ladings are 1.5mg cm in cathode catalysis layer-2-3mg cm-2。
Further, step 4) in Catalytic Layer mass fraction shared by proton conductor be 25wt.%-40wt.%.
Further, step 5) described in proton exchange membrane be perfluoro sulfonic acid membrane, the electrode of direct methanol fuel cell with
The pressing condition of proton exchange membrane is pressure 6.0Nm~8.0Nm, is suppressed at room temperature.
(1) processing of gas diffusion layers
Gas diffusion layers are immersed in certain density polytetrafluoroethylsolution solution, impregnates 30 seconds, carbon paper is put into baking oven
Middle drying is put into Muffle furnace after carbon paper drying and is sintered, obtains the carbon paper of surface hydrophobicity, wherein polytetrafluoroethylene (PTFE) is in gas
Mass fraction on diffusion layer is 20wt.%-30wt.%.
(2) preparation of outer microporous layers
By the slurry on the carbon paper even application of surface hydrophobicity obtained in step (1) containing carbon dust and polytetrafluoroethylene (PTFE),
The carbon paper for spraying spreading mass is put into baking oven drying, after be put into Muffle furnace and be sintered, obtain outer microporous layers, polytetrafluoroethylene (PTFE) exists
Mass fraction in outer microporous layers is 15wt.%-20wt.%.
(3) preparation of interior microporous layers
By carbon dust and perfluorinated sulfonic acid-polytetrafluoroethylene (PTFE) on outer micropore layer surface even application obtained in step (2)
(Nafion) microporous layers for spraying spreading mass are put into baking oven drying, matter of the Nafion in interior microporous layers by the slurry of copolymer
Amount score is 25wt.%-35wt.%, thus to obtain the microporous layers with double-layer structure.
(4) preparation of Catalytic Layer
The catalyst slurry containing proton conductor will be uniformly coated in the microporous layers of obtained double-layer structure in step (3)
Material, catalyst is the Pt/C or PtRu/C that the weight percent of metal is 40wt.%-70wt.%, is put into baking oven and protects after spraying
A period of time is held until drying, that is, obtain the electrode for improving the direct methanol fuel cell of catalyst utilization.
(5) assembling of membrane electrode
The electrode that the direct methanol fuel cell of catalyst utilization is improved obtained in step (4) is passed with having ion
The proton exchange membrane pressing of ability is led, pressing pressure 7.5Nm is suppressed at room temperature, is urged without hot pressing to get to raising
The direct methanol fuel cell membrane electrode of agent utilization rate.
Compared with the membrane electrode of traditional single microporous layers, double micropore layer membrane electrodes proposed by the invention have following excellent
Point:
(1) bigger electrochemical surface area
When battery operation for a period of time after, due to assembling pressure, methanol charging and gas flowing influence, one can be made
Divided catalyst is sunk in microporous layers, proton transmitter is not contained in the structure of conventional electrodes list microporous layers, this allows for this portion
Divided catalyst is not used, to reduce three-phase reaction interface.And in double microporous layers electrodes proposed by the invention, due to
Proton transmitter is added in interior microporous layers utilizes this partial catalyst, to expand electrochemical surface area.
(2) higher catalyst utilization
And interior microporous layers of the present invention utilize this partial catalyst leaked into microporous layers, improve
The utilization rate of catalyst thus greatly reduces the preparation cost of electrode.
(3) lower resistance to mass tranfer
Conventional electrodes list microporous layers are usually hydrophobic structure, this has resulted in the difficult feed of methanol at low concentrations, are added
Resistance to mass tranfer in big electrode, affects the performance of monocell.And Nafion is added in double microporous layers of the present invention
Polymer, the hydrophily with height enhance the transmission of methanol, reduce the resistance to mass tranfer of electrode.
Detailed description of the invention
Fig. 1 is the direct methanol fuel cell film electrode structure schematic diagram of the present invention for improving catalyst utilization；
Fig. 2 is the direct methanol fuel cell electrode preparation technology flow chart of the present invention for improving catalyst utilization；
Fig. 3 is the direct methanol fuel cell membrane electrode process flow for assembling of the present invention for improving catalyst utilization
Figure；
Fig. 4 is 1 fuel cell electric discharge performance curve of embodiment；
Fig. 5 is 2 fuel cell electric discharge performance curve of embodiment；
Fig. 6 is 3 fuel cell electric discharge performance curve of embodiment；
Fig. 7 is 4 fuel cell electric discharge performance curve of embodiment；
Fig. 8 is 1 fuel cell electric discharge performance curve of comparative example；
Fig. 9 is 2 fuel cell electric discharge performance curve of comparative example；
Figure 10 is 3 fuel cell electric discharge performance curve of comparative example；
Figure 11 is 4 fuel cell electric discharge performance curve of comparative example.
Appended drawing reference is as follows:
1- gas diffusion layers；2- contains the microporous layers of PTFE；3- contains the microporous layers of Nafion；4- anode catalyst layer；5-
Proton exchange membrane；6- cathode catalysis layer.
Specific embodiment
Embodiment 1
Process and technique prepare the direct methanol fuel cell electrode and film electricity that improve catalyst utilization as shown in Figure 2
Pole, and discharge test is carried out, key step is as follows:
(1) preparation of electrode
Using the carbon paper containing polytetrafluoroethylene (PTFE) (PTFE) as diffusion layer, the micropore containing PTFE is coated on hydrophobic diffusion layer
Layer 2, wherein polytetrafluoroethylene content is 15wt.%.The microporous layers 3 containing Nafion are coated in outer microporous layers, wherein
Nafion content is 30wt.%.The catalyst pulp for deploying proper proportion, uses isopropanol as solvent.It is used in anode-side
Pt Ru/C uses Pt/C as catalyst as catalyst, in cathode side, and catalysis is sprayed in the microporous layers 3 containing Nafion
Agent slurry, to form catalyst layer.
(2) processing of proton exchange membrane
By film 5wt.% H2O2It boils in solution 1 hour, then cleans in deionized water, then in the sulphur of 0.5M
It boils 1 hour, finally boils in deionized water 1 hour in acid solution.Pretreatment film is stored in deionized water before suppressing MEA
In.
(3) membrane electrode assembles
There is the electrode of double micro cavity layer structures and 212 membrane pressure of Nafion to close two panels, pressing condition is pressure 7.5Nm,
It is suppressed at room temperature, the direct methanol fuel of the present invention for improving catalyst utilization is arrived without hot pressing
Cell membrane-electrode.
(4) discharge performance is tested
It is tested after gained membrane electrode assembly and sealed air cushion are assembled in monocell, test condition are as follows: battery work
Make temperature 60 C, normal pressure, anode fuel is that (flow is 3ml min to 0.5M methanol-1), cathode inlet is that (flow is dry oxygen
199ml min-1).Limiting current density is up to 120.17mA cm-2, maximum power density reaches 22.23mW cm-2, compared to
The maximum power density of comparative example 1, embodiment 1 improves 56.53%.
Embodiment 2
Methanol by the direct methanol fuel cell membrane electrode of catalyst utilization of the present invention in high concentration, drying
It is tested under conditions of oxygen.Firstly, preparing double microporous layers electrodes by program same as Example 1.
It is tested after gained membrane electrode assembly and sealed air cushion are assembled in monocell, test condition are as follows: battery work
Make temperature 60 C, normal pressure, anode fuel is that (flow is 3ml min to 2M methanol-1), cathode inlet is that (flow is dry oxygen
199ml min-1).Limiting current density is up to 500.21mA cm-2, maximum power density reaches 76.29mW cm-2, embodiment 2
41.01% is improved compared to comparative example 2.
Embodiment 3
Methanol by the direct methanol fuel cell membrane electrode of catalyst utilization of the present invention in low concentration, humidification
It is tested under conditions of oxygen.Firstly, preparing double microporous layers electrodes by program same as Example 1.
It is tested after gained membrane electrode assembly and sealed air cushion are assembled in monocell, test condition are as follows: battery work
Make temperature 60 C, normal pressure, anode fuel is that (flow is 3ml min to 0.5M methanol-1), cathode inlet is that humidification oxygen is (relatively wet
Degree is 60%, and flow is 199ml min-1).Limiting current density is up to 135.05mA cm-2, maximum power density reaches
29.12mW cm-2, embodiment 3 improves 97.38% compared to comparative example 3.
Embodiment 4
Methanol by the direct methanol fuel cell membrane electrode of catalyst utilization of the present invention in high concentration, humidification
It is tested under Oxygen Condition.Firstly, preparing double microporous layers electrodes by program same as Example 1.
It is tested after gained membrane electrode assembly and sealed air cushion are assembled in monocell, test condition are as follows: battery work
Make temperature 60 C, normal pressure, anode fuel is that (flow is 3ml min to 2M methanol-1), cathode inlet is humidification oxygen (relative humidity
It is 60%, flow is 199ml min-1).Limiting current density is up to 550.12mA cm-2, maximum power density reaches
81.04mW cm-2, embodiment 4 improves 36.65% compared to comparative example 4.
Comparative example 1
The fuel cell electrode and membrane electrode for preparing general microporous layer structure carry out discharge performance comparison.Steps are as follows:
(1) prepared by membrane electrode: using the carbon paper containing polytetrafluoroethylene (PTFE) (PTFE) as anode diffusion layer.In hydrophobic diffusion
Outer microporous layers are coated on layer, wherein polytetrafluoroethylene content is 15wt.%.Suitable catalyst is dispersed in deionized water, different
In propyl alcohol and Nafion solution, it is prepared for catalyst pulp.It uses Pt Ru/C as catalyst in anode-side, makes in cathode side
Use Pt/C as catalyst.Catalyst pulp is coated in microporous layers, forms catalyst layer.212 film of Nafion is located in advance
Reason removes organic and inorganic pollution.Preprocessing process include by film 5wt% H2O2It boils in solution 1 hour, then exists
It is washed in deionized water, then boils 1 hour, finally boil in deionized water 1 hour in the sulfuric acid solution of 0.5M.In group
Before filling MEA, pretreatment film is saved in deionized water.
(2) membrane electrode assembles: dielectric film is 212 film of Nafion, by the identical gas-diffusion electrode of the two panels prepared
Dielectric film two sides are placed in, is pressed using the assembling pressure of 7.5Nm, obtains three-in-one membrane electrode assembly.
(3) monocell is tested: being surveyed after gained three-in-one membrane electrode assembly and sealed air cushion are assembled in monocell
Examination, test condition are same as Example 1.Limiting current density reaches 99.98mA cm-2, maximum power density reaches
14.20mW cm-2。
Comparative example 2
The fuel cell electrode and membrane electrode of general microporous layer structure are put under the conditions of high concentration methanol, dry oxygen
Electrical property comparison.
Firstly, the fuel cell electrode and film of general microporous layer structure are prepared and assembled by program identical with comparative example 1
Electrode.It is tested after gained three-in-one membrane electrode assembly and sealed air cushion are assembled in monocell, test condition is and reality
It is identical to apply example 2.Limiting current density reaches 350.07mA cm-2, maximum power density reaches 54.11mW cm-2。
Comparative example 3
The fuel cell electrode and membrane electrode of general microporous layer structure are humidified and are put under Oxygen Condition in low concentration methanol
Electrical property comparison.
Firstly, the fuel cell electrode and film of general microporous layer structure are prepared and assembled by program identical with comparative example 1
Electrode.It is tested after gained three-in-one membrane electrode assembly and sealed air cushion are assembled in monocell, test condition is and reality
It is identical to apply example 3.Limiting current density reaches 82.34mA cm-2, maximum power density reaches 14.75mW cm-2。
Comparative example 4
The fuel cell electrode and membrane electrode of general microporous layer structure are humidified and are put under Oxygen Condition in low concentration methanol
Electrical property comparison.
Firstly, the fuel cell electrode and film of general microporous layer structure are prepared and assembled by program identical with comparative example 1
Electrode.It is tested after gained three-in-one membrane electrode assembly and sealed air cushion are assembled in monocell, test condition is and reality
It is identical to apply example 4.Limiting current density reaches 375.04mA cm-2, maximum power density reaches 59.30mW cm-2。
From comparative example as can be seen that it is of the present invention improve catalyst utilization direct methanol fuel cell electrode and
Membrane electrode has better discharge performance.When 60 DEG C, still dry situation is either humidified, embodiment is compared to comparative example
It is all improved largely in maximum discharge current density and maximum power density, compared to comparative example 1, the maximum of embodiment 1
Power density improves 56.53%；Embodiment 2 improves 41.01% compared to comparative example 2；Embodiment 3 is compared to comparative example 3
Improve 97.38%；Embodiment 4 improves 36.65% compared to comparative example 4.The addition of interior microporous layers is illustrated so that part
The catalyst that can not be utilized that microporous layers are seeped under due to battery operation is utilized, and the utilization of catalyst is improved
Rate.This double micro cavity layer structures increase the electrochemical surface area of battery, reduce resistance to mass tranfer, imitate to electrochemical reaction
Rate, mass transfer play facilitation, so that the discharge performance of battery is effectively improved.
It should be noted that according to each embodiment of the present invention, the present invention is may be implemented in those skilled in the art completely
The full scope of independent claims and dependent claims realizes process and the same the various embodiments described above of method；And the present invention is not
It elaborates and partly belongs to techniques well known.
The above, part specific embodiment only of the present invention, but scope of protection of the present invention is not limited thereto, appoints
What those skilled in the art in the technical scope disclosed by the present invention, replaces in the variation that can be readily occurred in, should cover
Within protection scope of the present invention.
Claims (11)
1. a kind of direct methanol fuel cell membrane electrode for improving catalyst utilization, including gas diffusion layers, microporous layers, catalysis
Layer and proton exchange membrane, which is characterized in that the microporous layers of direct methanol fuel cell membrane electrode have double-layer structure, including one layer
The interior microporous layers of outer microporous layers containing hydrophobic polymer and one layer of polymer with proton conductivity.
2. improving the preparation method of the direct methanol fuel cell membrane electrode of catalyst utilization, feature according to claim 1
It is, includes the following steps:
Step 1: the processing of gas diffusion layers: gas diffusion layers being immersed in the solution of certain density hydrophobic polymer,
After being soaked for a period of time, gas diffusion layers are placed in oven and dried, Muffle furnace is put into after gas diffusion layers drying and is burnt
Knot, obtains the gas diffusion layers of surface hydrophobicity；
Step 2: the preparation of outer microporous layers: by step 1) obtained in surface hydrophobicity gas diffusion layers even application on contain
The slurry of carbon dust and hydrophobic polymer, by the gas diffusion layers for spraying spreading mass be put into baking oven drying, after be put into Muffle furnace into
Row sintering, obtains outer microporous layers；
Step 3: the preparation of interior microporous layers: by step 2) obtained in carbon dust and there is matter on outer micropore layer surface even application
The microporous layers for spraying spreading mass are put into baking oven drying by the slurry of the polymer of sub- conducting power, and obtaining has double-layer structure
Microporous layers；
Step 4: the preparation of Catalytic Layer: by step 3) in obtained double-layer structure microporous layers on uniformly it is coated containing proton
The catalyst pulp of conductor, and be put into baking oven and kept for a period of time until drying, that is, obtain and improve the straight of catalyst utilization
Connect the electrode of methanol fuel cell；
Step 5: the assembling of membrane electrode: by step 4) obtained in raising catalyst utilization direct methanol fuel cell
Electrode presses to arrive the direct methanol fuel electricity for improving catalyst utilization with the proton exchange membrane with ionic conductivity
Pond membrane electrode.
3. improving the preparation method of the direct methanol fuel cell membrane electrode of catalyst utilization, feature according to claim 2
Be, step 1) in gas diffusion layers to be immersed in time in hydrophobic polymer be 30~90 seconds, the sintering in Muffle furnace
Temperature is 350-400 degree, and the time is 40~60 minutes.
4. improving the preparation method of the direct methanol fuel cell membrane electrode of catalyst utilization, feature according to claim 2
Be, step 1) in gas diffusion layers be by the removal carbon paper of surface impurity, carbon cloth, nickel foam or other there is conduction
The material of ability.
5. improving the preparation method of the direct methanol fuel cell membrane electrode of catalyst utilization, feature according to claim 2
Be, step 1) in hydrophobic polymer be polytetrafluoroethylene (PTFE) or polyvinyl alcohol or Kynoar, hydrophobic polymeric
The mass fraction of object on the gas diffusion is 20wt.%~40wt.%.
6. improving the preparation method of the direct methanol fuel cell membrane electrode of catalyst utilization, feature according to claim 2
Be, step 2) in paste composition be carbon dust, hydrophobic polymer, dispersion solvent mixed solution；Wherein, hydrophobic polymeric
Mass fraction of the object in outer microporous layers is 15wt.%-30wt.%.
7. improving the preparation method of the direct methanol fuel cell membrane electrode of catalyst utilization, feature according to claim 2
Be, step 3) in paste composition be carbon dust, the polymer with proton conductivity, dispersion solvent mixed solution, wherein
The volume of dispersion solvent is in 5-10ml.
8. improving the preparation method of the direct methanol fuel cell membrane electrode of catalyst utilization, feature according to claim 7
Be, step 3) in proton conductivity polymer be perfluorinated sulfonic acid-polytetrafluoroethylene (PTFE), dispersion solvent be isopropanol,
Ethyl alcohol, acetone；Wherein, mass fraction of the perfluorinated sulfonic acid-polytetrafluoroethylene (PTFE) in interior microporous layers is 20wt.%~40wt.%.
9. improving the preparation method of the direct methanol fuel cell membrane electrode of catalyst utilization, feature according to claim 2
Be, step 4) in anode catalyst be metal weight percent be 40wt.%-70wt.% Pt/C or PtRu/C,
Metal ladings are 2mg cm in anode catalyst layer-2-5mg cm-2；Cathod catalyst is that the weight percent of metal is 40wt.%-
The Pt/C or PtRu/C of 70wt.%, metal ladings are 1.5mg cm in cathode catalysis layer-2-3mg cm-2。
10. according to the preparation method of the direct methanol fuel cell membrane electrode of claim 2 catalyst utilization, feature exists
In step 4) in Catalytic Layer mass fraction shared by proton conductor be 25wt.%-40wt.%.
11. according to the preparation method of the direct methanol fuel cell membrane electrode of claim 2 catalyst utilization, feature exists
In step 5) described in proton exchange membrane be perfluoro sulfonic acid membrane, the electrode of direct methanol fuel cell and the pressure of proton exchange membrane
Conjunction condition is pressure 6.0N m~8.0N m, is suppressed at room temperature.
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| CN201910638280.1A CN110504472B (en) | 2019-07-16 | 2019-07-16 | Direct methanol fuel cell membrane electrode for improving catalyst utilization rate and preparation method thereof |
| AU2020101412A AU2020101412A4 (en) | 2019-07-16 | 2020-07-20 | Direct methanol fuel cell membrane electrode for improving catalyst utilization and preparation method thereof |
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| CN201910638280.1A CN110504472B (en) | 2019-07-16 | 2019-07-16 | Direct methanol fuel cell membrane electrode for improving catalyst utilization rate and preparation method thereof |
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| CN201910638280.1A Active CN110504472B (en) | 2019-07-16 | 2019-07-16 | Direct methanol fuel cell membrane electrode for improving catalyst utilization rate and preparation method thereof |
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| CN (1) | CN110504472B (en) |
| AU (1) | AU2020101412A4 (en) |
Cited By (8)
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| CN111916765A (en) * | 2020-07-29 | 2020-11-10 | 一汽解放汽车有限公司 | Method for preparing gas diffusion layer in fuel cell |
| CN112331858A (en) * | 2020-10-30 | 2021-02-05 | 江苏大学 | Fuel cell electrode with catalyst in-situ grown on ordered structure microporous layer and preparation method of membrane electrode |
| CN112382767A (en) * | 2020-10-26 | 2021-02-19 | 江苏大学 | Fuel cell electrode in-situ preparation method based on double-layer ordered structure microporous layer |
| CN112820883A (en) * | 2020-12-31 | 2021-05-18 | 武汉理工氢电科技有限公司 | Microporous layer slurry, gas diffusion layer, fuel cell and preparation method |
| CN113555568A (en) * | 2021-07-26 | 2021-10-26 | 中汽创智科技有限公司 | Membrane electrode and preparation method thereof |
| CN114243044A (en) * | 2021-12-21 | 2022-03-25 | 中国科学院山西煤炭化学研究所 | Gas diffusion layer for improving water management capability of fuel cell and preparation method thereof |
| CN114744263A (en) * | 2022-04-25 | 2022-07-12 | 中国第一汽车股份有限公司 | Fuel cell membrane electrode |
| CN115863699A (en) * | 2022-12-16 | 2023-03-28 | 海卓动力(北京)能源科技有限公司 | Activation method of fuel cell stack |
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| CN114068974A (en) * | 2021-10-25 | 2022-02-18 | 上海远瞩新能源科技有限公司 | Fuel cell gas diffusion layer with functional structure and preparation method thereof |
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| CN111916765A (en) * | 2020-07-29 | 2020-11-10 | 一汽解放汽车有限公司 | Method for preparing gas diffusion layer in fuel cell |
| CN112382767A (en) * | 2020-10-26 | 2021-02-19 | 江苏大学 | Fuel cell electrode in-situ preparation method based on double-layer ordered structure microporous layer |
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| CN114243044A (en) * | 2021-12-21 | 2022-03-25 | 中国科学院山西煤炭化学研究所 | Gas diffusion layer for improving water management capability of fuel cell and preparation method thereof |
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| CN110504472B (en) | 2021-11-09 |
| AU2020101412A4 (en) | 2020-09-10 |
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