CN109768298B - proton exchange membrane fuel cell - Google Patents
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- CN109768298B CN109768298B CN201811525579.8A CN201811525579A CN109768298B CN 109768298 B CN109768298 B CN 109768298B CN 201811525579 A CN201811525579 A CN 201811525579A CN 109768298 B CN109768298 B CN 109768298B
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Abstract
本发明公开了一种新型质子交换膜燃料电池，该质子交换膜燃料电池通过在扩散层设计流道或设计专门的对流层来实现水电气进出电池的通道，可以实现“去双极板化”或者“双极板去流道化”，显著减少电池中双极板和扩散层之间的接触传输阻力，从而获得高效率、低成本、高使用寿命的PEMFC。The invention discloses a novel proton exchange membrane fuel cell. The proton exchange membrane fuel cell realizes the passage of water and electricity into and out of the cell by designing a flow channel in the diffusion layer or designing a special convective layer, and can realize "de-bipolar plateization" or "Bipolar plate de-channelization" significantly reduces the contact transport resistance between the bipolar plate and the diffusion layer in the battery, resulting in a PEMFC with high efficiency, low cost, and long service life.
Description
Technical Field
The invention relates to a Proton Exchange Membrane Fuel Cell (PEMFC), in particular to a PEMFC with a novel electrode structure, which can remove an electrode plate or planarize the electrode plate by improving the electrode structure of the conventional PEMFC and designing a diffusion layer or a special troposphere structure with a flow channel, thereby obviously reducing the contact transmission resistance between a bipolar plate and the diffusion layer in the cell and obtaining a high-efficiency PEMFC, and belongs to the technical field of fuel cells.
Background
Hydrogen energy is considered as an ideal secondary energy source for solving the problems of wind and electricity abandonment, reducing the dependency on petroleum and realizing the synergistic solution of energy and environmental problems, and a Proton Exchange Membrane Fuel Cell (PEMFC) is considered as a final solution of a new energy automobile and has attracted high attention and intense competition in major countries of the world.
At present, the heart of a PEMFC stack is the MEA assembly and the bipolar plate (a conventional hydrogen fuel cell structure is shown in fig. 1). The MEA is formed by respectively placing two carbon fiber paper diffusion layer electrodes with one surfaces coated with Nafion solution and Pt catalyst on two sides of a pretreated proton exchange membrane, pressing the catalyst close to the proton exchange membrane at a certain temperature and pressure. The bipolar plate is composed of a polar plate and a flow field, and the main positive effects of the bipolar plate comprise: the cell is mainly characterized in that flow channels are designed on the bipolar plate. However, it has also been found in research that the use of bipolar plates of this construction also has a number of negative side effects on the cell:
1) bipolar plates are a major contributor to PEMFC manufacturing cost, manufacturing difficulty, power density, corrosion failure, and the like.
There are three main types of bipolar plates in common use: graphite bipolar plate, metal bipolar plate, composite bipolar plate. The processing cost of the graphite plate flow channel is high, which accounts for more than 80% of the cost, and the processing time is long; the metal plate needs to be subjected to anti-corrosion coating treatment on the surface, the technical difficulty is high, the pinholes are difficult to prevent, and the metal plate is a short plate which influences the service life of a battery. The thickness of the graphite bipolar plate is about 2-3.7 mm, the graphite bipolar plate accounts for more than half of the total thickness of the cell, the weight of the bipolar plate accounts for 60-80% of the weight of the whole fuel cell stack, and the cost accounts for 25-50%. In a word, the bipolar plate has the characteristics of high processing difficulty, high occupied cost, high occupied volume and mass proportion and the like in the battery.
2) The bipolar plate causes the carbon paper diffusion layer to be seriously deformed, and influences the flow channel design and the mass and heat transfer
Because the Young modulus of the bipolar plate is 13000MPa, is far greater than the Young modulus of 6MPa of the GDL, and the thickness of the diffusion layer is thin, the porous structure of the bipolar plate is damaged on the GDL mainly subjected to deformation caused by assembly pressure, so that the generation of water and the change of the porosity of the GDL can be greatly influenced, the porosity, gas permeability, mass diffusion coefficient, thermal conductivity, electric conductivity and other properties of the GDL can be further influenced, and a new problem is brought to water supply management; the thermal contact resistance produced by contacting the MEA and bipolar plates accounts for 65% to 90% of the total thermal resistance, although the addition of PTFE and MPL also increases the thermal contact resistance. In summary, the resultant problems are a severe reduction in battery life and inefficient power output.
In summary, in the current PEMFC, the bipolar plate plays a role in electrical conduction, thermal conduction, gas conduction, membrane electrode support, etc., but it also sacrifices huge power density, increases transmission resistance of the corresponding interface, and because the difference between the young modulus of the bipolar plate and that of other material components is huge, it may cause damage to other components that are difficult to recover in the pressure assembly process, and seriously affects the battery life.
Disclosure of Invention
In order to improve the mass and heat transfer inside the PEMFC, the conventional cell generally designs a flow channel structure in the bipolar plate to improve the convection function inside the cell, therefore, the surfaces of the bipolar plates correspondingly form a flow channel part and a ridge part, only the ridge part with a narrow area is in direct contact with the diffusion layer in the battery assembling process, the transmission resistance is high, but also increases the local contact pressure, and because the elastic modulus of the bipolar plate and the diffusion layer is different by several orders of magnitude, the deformation of the system is concentrated on the diffusion layer due to the pressure assembly process, so that the porosity of the diffusion layer in contact with the ridge of the bipolar plate is obviously reduced, the diffusion layer located at the flow channel part is even pressed into the flow channel, which affects the mass transfer efficiency, and the uneven deformation of the diffusion layer is serious, which even leads to the breaking of the carbon fiber, and even more likely to affect the service life of the catalyst and the membrane, and even the whole cell stack. In addition, bipolar plates also have a critical impact on the power density and lifetime of fuel cells. The bipolar plate mainly comprises a graphite plate, a composite plate and a metal plate. The former has disadvantages in power density and manufacturing cost of the battery due to large thickness, large brittleness and large processing difficulty; the latter is disadvantageous in terms of manufacturing cost and life of the battery due to the difficulty in corrosion prevention. Of course, especially the self-contained flow channels are the main reason for the high price of the current bipolar plate. Aiming at the problems of the electrode structure of the PEMFC in the prior art, the invention aims to provide a novel Proton Exchange Membrane Fuel Cell (PEMFC) with a brand-new electrode structure, which can realize the 'bipolar plate removal' and the 'bipolar plate removal flow channel formation' by designing a diffusion layer with a flow channel or a special convection layer structure, and remarkably reduce the contact transmission resistance between the bipolar plate and the diffusion layer in the cell, thereby obtaining the PEMFC with high efficiency, low cost and long service life.
In order to achieve the above technical objects, the present invention provides a novel proton exchange membrane fuel cell, which comprises an A, B, C, D or E structure:
structure A: the proton exchange membranes are arranged between the cathode unit and the anode unit and on the outer sides of the cathode unit and the anode unit; the cathode unit is composed of a diffusion layer and cathode catalyst layers on two sides of the diffusion layer; the anode unit consists of a diffusion layer and anode catalyst layers on two sides of the diffusion layer, and runners are arranged in the center positions of the diffusion layers of the cathode unit and the anode unit;
the structure B is as follows: the proton exchange membranes are arranged between the cathode unit and the anode unit and on the outer sides of the cathode unit and the anode unit; the cathode unit consists of a diffusion layer/convection layer/diffusion layer integrated structure and cathode catalyst layers on two sides of the diffusion layer/convection layer/diffusion layer integrated structure; the anode unit consists of a diffusion layer/convection layer/diffusion layer integrated structure and anode catalyst layers on two sides of the diffusion layer/convection layer/diffusion layer integrated structure;
structure C: the device consists of a cathode plate, an anode unit, a cathode unit and a proton exchange membrane; a proton exchange membrane is arranged between the cathode unit and the anode unit, and an anode plate and a cathode plate are respectively arranged at the outer sides of the cathode unit and the anode unit; the cathode unit comprises a convection layer, a diffusion layer and a cathode catalyst layer, wherein the cathode catalyst layer is arranged on one side of the proton exchange membrane of the diffusion layer, and the convection layer is arranged on one side of the cathode plate; the anode unit comprises a convection layer, a diffusion layer and an anode catalyst layer, wherein the anode catalyst layer is arranged on one side of the proton exchange membrane of the diffusion layer, and the convection layer is arranged on one side of the anode plate; one sides of the cathode plate and the anode plate, which are close to the corresponding convection layers, are both of a planar structure;
structure D: the device consists of a cathode plate, an anode unit, a cathode unit and a proton exchange membrane; a proton exchange membrane is arranged between the cathode unit and the anode unit, and an anode plate and a cathode plate are respectively arranged at the outer sides of the cathode unit and the anode unit; the cathode unit comprises a diffusion layer and a cathode catalyst layer, wherein the cathode catalyst layer is arranged on one side of the proton exchange membrane of the diffusion layer; the anode unit comprises a diffusion layer and an anode catalyst layer, wherein the anode catalyst layer is arranged on one side of the proton exchange membrane of the diffusion layer; the cathode plate and the anode plate are both of flat plate structures; the central positions of the diffusion layers of the anode unit and the cathode unit are provided with flow channels;
structure E: the device consists of a cathode plate, an anode unit, a cathode unit and a proton exchange membrane; a proton exchange membrane is arranged between the cathode unit and the anode unit, and an anode plate and a cathode plate are respectively arranged at the outer sides of the cathode unit and the anode unit; the cathode unit comprises a diffusion layer and a cathode catalyst layer, wherein the cathode catalyst layer is arranged on one side of the proton exchange membrane of the diffusion layer; the anode unit comprises a diffusion layer and an anode catalyst layer, wherein the anode catalyst layer is arranged on one side of the proton exchange membrane of the diffusion layer; the cathode plate and the anode plate are both of flat plate structures; a flow channel is arranged on one side of the anode plate of the diffusion layer of the anode unit; and a flow channel is arranged on one side of the cathode plate of the diffusion layer of the cathode unit.
Preferably, in the structure B, the diffusion layer/convection layer/diffusion layer integrated structure is formed by overlapping two diffusion layers and one convection layer, and the middle layer is the convection layer. In the forming process, the troposphere can be used as a 'sandwich' to be pressed and formed together with the two diffusion layers, or the troposphere can be used as a 'sandwich' to be closely contacted and superposed with the two diffusion layers.
Preferably, in the structure C, the troposphere and the diffusion layer of the cathode unit and the anode unit are of an integrated structure or are in close contact with each other. The troposphere and the diffusion layer may be integrally formed, or may be separately formed and then they are in close contact in a planar manner.
In a more preferable scheme, the troposphere is of a macroporous structure with a convection function. The convection layer with a macroporous structure is used as a convection channel for air and water to enter and exit the battery, and the function of the convection layer is similar to that of a flow channel on the electrode plate of the conventional PEMFC. The pore structure of the macroporous structure can be actually adjusted according to the situation, and the aim of gas and water convection can be fulfilled, which is easily understood and implemented by technical personnel in the industry.
Preferably, the convection layer is made of metal or carbon-graphite material, or is made of macromolecule or ceramic mesh with a conductive layer plated on the surface. Specifically, the carbon fiber may be carbon fiber, porous titanium, titanium mesh, stainless steel mesh, or carbon fiber plated with titanium or other metals.
The cathode plate, the anode plate, the proton exchange membrane, the cathode catalyst layer, the anode catalyst layer and the diffusion layer of the novel PEMFC can be processed and manufactured by adopting conventional materials and conventional processes in the prior art. The anode plate and the cathode plate can be of a plane structure, and a flow channel does not need to be processed.
The novel PEMFC can be provided with a flow channel or a convection layer in the diffusion layer to form a diffusion layer with a flow channel or a convection function, so that the conventional process of arranging the flow channel in the polar plate is replaced; so that the bipolar plate in the PEMFC can be designed as a flat plate that is easy to process or even removed. The PEMFC without the bipolar plate integrates two like poles into one, a flow channel (a convection layer) is arranged in the middle of a diffusion layer with the same pole to form an anode unit and a cathode unit respectively, the units are separated by a proton exchange membrane to replace the gas insulation function of the bipolar plate, catalysts are positioned on two sides of the membrane, the mass transfer efficiency and the assembly performance of the electrode are improved by using the bipolar plate, and the stress concentration and the deformation concentration of the electrode are avoided in the pressure assembly process.
In the PEMFC with the novel electrode structure, the flow channel is arranged at the central position in the diffusion layer or the convection layer with a special structure is arranged, so that the diffusion layer can be constructed into a structure of ' diffusion layer + central flow channel ' (or convection layer, 2+1 mode is adopted, and the convection layer is clamped in the middle of the diffusion layer) ', and the PEMFC plays a role in conveying water and gas; the design of the electrode structure can be such that the bipolar plate is eliminated or can be designed as a planar structure.
The PEMFC with the novel electrode structure can also be provided with a flow channel or a convection layer with a special structure on one side of the diffusion layer close to the electrode, specifically, the flow channel (or the convection layer, the diffusion layer and the convection layer adopt a 1+1 mode) is designed on one side of the diffusion layer contacted with the bipolar plate to play a role of a pipeline for transporting water and gas, and the other side of the diffusion layer contacted with the catalyst layer and the proton exchange membrane still keeps a plane structure. The design of the electrode structure can design the bipolar plate into a planar structure.
The method for processing the flow channel in the diffusion layer of the invention is introduced as follows: the method mainly adopts a mould pressing method, and one of the specific processing methods is as follows: after the flat diffusion layer is formed, a steel mould with a flow channel is adopted to perform compression forming on the flat carbon paper diffusion layer, a specific flow channel is formed on one surface of the carbon paper, and then other subsequent processes are performed; the second specific processing method is as follows: after the flat diffusion layer is formed, a columnar mold is placed between the two flat diffusion layers, then the two flat diffusion layers are pressed into a diffusion layer, the middle columnar mold is removed, and then other subsequent processes are carried out. The method of assembling the battery is similar to the conventional method.
Compared with the prior art, the technical scheme of the invention has the beneficial technical effects that:
the novel PEMFC is mainly characterized in that the electrode structure of the conventional PEMFC is improved, and the diffusion layer or the special convection layer structure with the flow channel is designed, so that an electrode plate can be removed or planarized, the contact transmission resistance between a bipolar plate and the diffusion layer in a battery is remarkably reduced, and the high-efficiency PEMFC is obtained. The method has the following specific beneficial effects:
1) the friction force between the gas and the inner wall of the flow channel is improved, the convection function and the residence time of the gas in the flow channel are improved, and therefore the utilization efficiency of the gas is improved;
2) the diffusion layer is combined with convection, so that a diffusion channel of gas is increased, a diffusion path of the gas is shortened, the diffusion efficiency of the gas is improved, and the size design of a flow channel is reduced;
3) the thickness and the weight of the bipolar plate are reduced on the whole, so that the stress state and the deformation in the battery tend to be balanced, and the power density of the battery is improved;
4) the contact resistance of the electrode structure is reduced, and the power density of the battery is improved;
5) the manufacturing difficulty and the manufacturing cost of the bipolar plate are reduced or eliminated, so that the manufacturing cost of the battery is reduced;
6) and the failure sites in the battery are reduced, and the service life of the battery is prolonged.
Drawings
Fig. 1 shows a cell structure of a conventional PEMFC;
fig. 2 shows a PEMFC "self-contained flow channel + bipolar plate-removed" cell structure;
fig. 3 shows a PEMFC "self-diffusion layer + bipolar plate-removed" cell structure;
FIG. 4 shows the cell structure of "planar bipolar plate + convective layer + diffusive layer" of the PEMFC;
FIG. 5 shows a planar bipolar plate + diffusion layer with a central flow channel of a PEMFC cell structure;
fig. 6 shows a cell structure of PEMFC "planar bipolar plate + diffusion layer with flow channels on its surface".
Detailed description of the preferred embodiments
The following examples are intended to further illustrate the present disclosure in detail in conjunction with the accompanying drawings, and not to limit the scope of the claims.
Based on the above serious influence that the arrangement and structural design of the flow channel in the current proton exchange membrane fuel cell may bring to the efficiency, life, cost, manufacturing difficulty and the like of the cell, the invention proposes the mode of adopting scheme a ("de-bipolar plate") and scheme B ("bipolar plate de-flow channel") respectively to reconstruct the electrode structure of the PEMFC aiming at the miniaturization and mass transfer high efficiency of the cell:
scheme A: depolarisation (for small power battery)
In PEMFCs, the modulus and the occupied weight of the bipolar plate far exceed those of other components in the cell, so that the deformation of the other components and the power density of the entire cell are seriously affected. Especially for a low-power battery, the heat generated by the battery is relatively less, and the heat transfer and temperature reduction functions of the bipolar plate are relatively not so outstanding, so that the bipolar plate is eliminated as an excellent scheme for improving the efficiency of the battery by optimizing the structural design and the material design of the battery and material components. Through improving the design of runner, improve contact condition and transmission efficiency between each part of battery, finally improve the power density and the life-span of battery, reduce the cost of manufacture and the degree of difficulty of each part.
The bipolar plate removing structure is a brand-new PEMFC electrode structure, which originally belongs to the transmission function and the gas insulation function of the bipolar plate in the aspects of gas conduction, heat conduction, electron conduction and the like, and a new carrier and structure must be found in the rest of the diffusion layer, the catalyst layer and the proton membrane for bearing. The comprehensive consideration adopts the following scheme: (1) designing a flow channel with a specific structure in the diffusion layer to be used as a convection channel of water and air; water and gas in a flow channel in the diffusion layer can be diffused in a three-dimensional all-dimensional manner, so that diffusion channels are increased, and diffusion paths are shortened; (2) the inner wall of the flow channel in the diffusion layer is of a porous structure and has a rough surface, so that the friction force generated on gas can obviously improve the gas retention and diffusion efficiency, and the transmission of the internal quantity of the battery and the back pressure of the gas can be reduced, thereby reducing external gas supply auxiliary components; (2) the diffusion layers on the two sides of the flow channel are connected into an interface-free integration to form a back-to-back cathode unit or an anode unit which is used as a main medium for gas diffusion and electric heat transmission; the contact interface and the contact transmission resistance of the component are reduced, because the transmission resistance of the interface accounts for 65-80% of the whole transmission resistance; (3) the gas is separated between the anode unit and the cathode unit by a proton exchange membrane, and the catalyst layers are positioned at two sides of the membrane, so that the gas-separating interface is reduced; (4) and (3) performing simulation calculation on the physical model of the electrode by adopting a finite element method, optimizing an optimal electrode structure with high-efficiency transmission, and providing theoretical guidance for subsequent electrode preparation research.
Scheme B: de-flow of bipolar plate (for high-power battery)
Since some of the more powerful cells generate more heat, bipolar plates are required to conduct the heat away. At present, the bipolar plate is generally made of metal bipolar plates, carbon-graphite bipolar plates, composite bipolar plates and the like, the modulus and the weight of the materials are far greater than those of other materials in the battery, so that the deformation of each material part of the battery is greatly different in the assembly process, and particularly when a flow channel is designed on the surface of the bipolar plate, unbalanced and consistent deformation undoubtedly causes damage to other parts, so that the output performance and the service life are greatly reduced; secondly, because the bipolar plate is used as a rigid material, the flow channel is processed on the surface of the bipolar plate, unbalanced internal stress generated in the material easily causes the deformation of the bipolar plate material, even generates fatal defects such as micropore cracks and the like, and causes the processing difficulty to be increased, so the flow channel (or the convection layer) is designed in the diffusion layer, the balance and the structure of the battery are optimized by regulating and controlling the modulus and the deformation of the material, and the service life and the output performance of the battery are improved.
Firstly, the flow channel on the surface of the bipolar plate is removed, the bipolar plate is made into a plane form, the flow channel (or convection layer) is designed on the diffusion layer (surface or central part), or a special plane convection layer is designed between the plane diffusion layer and the plane bipolar plate, the diffusion layer and the convection layer can be made of the same or different materials, and the diffusion layer and the convection layer can be mutually independent or made into an integrated body. Such a design has the following advantages: (1) the processing difficulty and the processing cost of the bipolar plate are greatly reduced, the thickness of the bipolar plate can be further reduced, and the power density of the battery is improved; (2) the indentation damage effect of the ridges of the bipolar plate on the diffusion layer is greatly reduced, the uniformity of the internal structure of the battery is improved, and the service life is prolonged; (3) the mass transfer of the gas in the flow channel to the catalyst is changed from one dimension to three dimensions, so that the mass transfer efficiency is greatly improved, the back pressure required by the gas is reduced, and the number of external gas supply auxiliary components is reduced.
Example 1
PEMFC "diffusion layer with flow channel (depolarisation)" cell structure. The cell structure is shown in fig. 2.
The main characteristics of the battery structure are: removing the bipolar plate of the traditional battery, designing a flow channel at the central part of a diffusion layer (GDL), wherein two sides of the diffusion layer are respectively provided with a catalyst layer (catalyst layer) with the same polarity, and a cathode (cathode) or an anode (anode) unit is formed together; the cathode unit and the anode unit are separated by a proton exchange membrane (membrane), and the periphery of the cathode unit and the anode unit is properly packaged. The power density of the galvanic pile of the battery is more than or equal to 2.5kW/L, and the service life of the battery is obviously prolonged compared with that of the traditional battery.
Example 2
PEMFCs "self-contained diffusion layer with troposphere (depolarisation)" cell structures. The cell structure is shown in fig. 3.
The main characteristics of the battery structure are: removing the bipolar plate of the traditional battery, designing the convection layer at the central part of a diffusion layer (GDL), wherein two sides of the diffusion layer are respectively provided with a catalyst layer (catalyst layer) with the same polarity, and a cathode (cathode) or an anode (anode) unit is formed together; the cathode unit and the anode unit are separated by a proton exchange membrane (membrane), and the periphery of the cathode unit and the anode unit is properly packaged. The power density of the galvanic pile of the battery is more than or equal to 2.5kW/L, and the service life of the battery is obviously prolonged compared with that of the traditional battery.
Example 3
PEMFC "planar bipolar plate + troposphere + diffusion layer" cell structure. The cell structure is shown in fig. 4 (upper diagram is a troposphere/diffusion layer integrated structure, and lower diagram is troposphere + diffusion layer close contact).
The main characteristics of the battery structure are: the method is characterized in that a flat bipolar plate is adopted, namely, one surface of the bipolar plate close to a diffusion layer is processed into a plane, a convection layer is added between the bipolar plate and the diffusion layer, the convection layer is made of carbon fiber, porous titanium, a titanium net, a stainless steel net and the like, catalyst layers are positioned on two sides of a proton exchange membrane to respectively form an anode and a cathode, and the periphery of the proton exchange membrane is properly packaged. The power density of the galvanic pile of the battery is more than or equal to 2.5kW/L, and the service life of the battery is obviously prolonged compared with that of the traditional battery.
Example 4
PEMFC "planar bipolar plate + cell structure with center flow channel diffusion layer". The cell structure is shown in fig. 5.
The main characteristics of the battery structure are: the method comprises the steps of processing one surface of the bipolar plate close to a diffusion layer into a plane, designing a flow channel at the central part of the diffusion layer (GDL), positioning catalyst layers at two sides of a proton exchange membrane to respectively form an anode and a cathode, and properly packaging the periphery of the anode and the cathode. The power density of the galvanic pile of the battery is more than or equal to 2.5kW/L, and the service life of the battery is obviously prolonged compared with that of the traditional battery.
Example 5
PEMFC "planar bipolar plate + cell structure with self-contained flow channel diffusion layer" on the surface. The cell structure is shown in fig. 6.
The main characteristics of the battery structure are: the bipolar plate is flat, that is, the surface of the bipolar plate contacting with the diffusion layer is processed into a plane, the flow channel is designed on the side of the diffusion layer (GDL) contacting with the bipolar plate, the catalyst layers are positioned on the two sides of the proton exchange membrane to respectively form an anode and a cathode, and the periphery of the bipolar plate is properly packaged. The power density of the galvanic pile of the battery is more than or equal to 2.5kW/L, and the service life of the battery is obviously prolonged compared with that of the traditional battery.
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| CN113937327B (en) * | 2020-06-28 | 2023-06-20 | 未势能源科技有限公司 | Membrane electrode assembly, fuel cell unit, fuel cell, and vehicle |
| TWI773589B (en) * | 2021-11-18 | 2022-08-01 | 元智大學 | Fuel cell and fuel cell manufacturing method |
| TWI769113B (en) * | 2021-11-18 | 2022-06-21 | 元智大學 | Fuel cell and fuel cell manufacturing method |
| CN114824312B (en) * | 2022-04-14 | 2024-06-07 | 广东氢发新材料科技有限公司 | Gas diffusion layer with flow channels and preparation method thereof |
| CN116826073A (en) * | 2023-06-09 | 2023-09-29 | 中国科学院苏州纳米技术与纳米仿生研究所 | Integrated gas diffusion layer of fuel cell and preparation method and application thereof |
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