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Microporous layer structure, preparation method, membrane electrode assembly and fuel cell

A membrane electrode assembly and fuel cell technology, which is applied to fuel cells, fuel cell parts, electrical components, etc., can solve the problems of increased reaction gas transfer resistance, mass transfer polarization loss, etc., to reduce overall costs and increase volume The effect of power density

Active Publication Date: 2020-02-14
SHANGHAI HYDROGEN PROPULSION TECH CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the operation of the proton exchange membrane fuel cell, water is needed to ensure the wettability of the membrane, reduce the membrane resistance, and thereby reduce the ohmic overpotential; however, excess liquid water will occupy the gas transfer channel and cover the surface of the catalyst, making the reaction The gas transfer resistance is greatly increased, resulting in serious mass transfer polarization loss

Method used

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  • Microporous layer structure, preparation method, membrane electrode assembly and fuel cell
  • Microporous layer structure, preparation method, membrane electrode assembly and fuel cell
  • Microporous layer structure, preparation method, membrane electrode assembly and fuel cell

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preparation example Construction

[0069] The preparation method of the microporous layer structure is simple, only need to change the amount of pore-forming agent in the slurry, and control the porosity of different regions, so as to achieve the purpose of fuel cell stack water balance. Specifically, the microporous layer 121 in the first region is prepared from the first slurry; the microporous layer 122 in the second region is prepared from the second slurry; the content of the pore-forming agent in the first slurry is less than the specified Describe the content of pore-forming agent in the second slurry.

[0070] The membrane electrode assembly designed with the microporous layer structure and the prepared fuel cell stack have the effect of improving the water balance on both sides of the cathode and anode for the reaction gas flow direction of the cathode and anode in a convection mode.

[0071] Based on the above embodiment, another embodiment of the present invention also provides a capital method for p...

other Embodiment approach

[0074] In other embodiments, the pre-prepared first slurry or the second slurry may also be used. The ratio of each component in the slurry is set according to the required porosity and water vapor transmission rate, and the ratio of each component is not specifically limited in this application. The first slurry needs to be stirred to make the components uniformly mixed, and the second slurry also needs to be stirred to make the components evenly mixed.

[0075] The conductive material is carbon black, preferably Vulcan XC-72(R) or Acetylene Black. The pore-forming agent includes one or both of ammonium carbonate, ammonium oxalate and lithium carbonate, preferably ammonium oxalate. The hydrophobic agent is polytetrafluoroethylene aqueous dispersion. The dispersion liquid is alcohols, and the alcohols include one or both of ethanol, isopropanol and ethylene glycol, preferably isopropanol.

[0076] Step S12: forming a film layer of the first slurry in the first region, and f...

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Abstract

The invention discloses a microporous layer structure, a preparation method, a membrane electrode assembly and a fuel cell. According to the technical scheme, the microporous layer comprises a first regional microporous layer and a second regional microporous layer which are sequentially arranged in a first direction; the porosity of the first regional microporous layer is less than that of the second regional microporous layer; the most probable pore diameter of the first regional microporous layer is greater than that of the second regional microporous layer; the average pore diameter of thefirst regional microporous layer is greater than that of the second regional microporous layer. Therefore, water balance can be realized without additionally arranging a humidifier, the overall costof the fuel cell system is effectively reduced, and the volume power density of the system is improved.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a microporous layer structure, a preparation method, a membrane electrode assembly and a fuel cell. Background technique [0002] As an alternative energy technology, fuel cells have attracted widespread attention due to their characteristics of easy start-up, high energy density, zero emissions, and high energy conversion efficiency, and have been continuously researched and developed. power supply and widely used. As a commercialized power supply system, its outstanding advantage is to have a long enough operating life and high energy density, such as for backup power supplies, passenger cars, material transport vehicles, submarines, etc. [0003] Proton exchange membrane fuel cells are the most mature and the closest to commercial fuel cells. During the operation of the proton exchange membrane fuel cell, water is needed to ensure the wettability of the membrane, reduce t...

Claims

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Application Information

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IPC IPC(8): H01M8/023H01M8/04119H01M8/1004
CPCH01M8/023H01M8/04149H01M8/1004Y02E60/50
Inventor 王晋唐厚闻方亮周红茹陈雪松
Owner SHANGHAI HYDROGEN PROPULSION TECH CO LTD
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