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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  • Abstract
  • Description
  • Claims
  • Application Information

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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, exces

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

Examples

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Example Embodiment

[0069] The preparation method of the microporous layer structure is simple. It only needs to change the amount of pore-forming agent in the slurry and control the porosity of different regions to achieve the goal of water balance in the fuel cell stack. Specifically, the first area microporous layer 121 is prepared from a first slurry; the second area microporous layer 122 is prepared from a second slurry; the content of the pore former in the first slurry is less than that of The content of the pore former in the second slurry.

[0070] The membrane electrode assembly designed by using 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 flow direction of the cathode and anode reaction gas in the convection mode.

[0071] Based on the foregoing embodiment, another embodiment of the present invention also provides a capital method for preparing the microporous layer structure d...

Example

[0074] In other embodiments, a preset first slurry or a second slurry can 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 evenly mixed. Similarly, the second slurry 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 former includes one or two of ammonium carbonate, ammonium oxalate and lithium carbonate, preferably ammonium oxalate. The hydrophobic agent is an aqueous dispersion of polytetrafluoroethylene. The dispersion liquid is alcohols, and the alcohols include one or two of ethanol, isopropanol, and ethylene glycol, preferably isopropanol.

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

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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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