Gas diffusion layer, membrane electrode assembly and fuel cell

By designing the concentration gradient of the through-pass and water-repellent resin in the microporous layer, the problem of water overflow at high current density in the prior art is solved, and higher electrochemical performance and durability are achieved.

CN114695903BActive Publication Date: 2025-03-28JNTG
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Patent Information

Application Number
CN202111637837.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2020-12-30
Filing Date
2021-12-29
Publication Date
2025-03-28
Estimated Expiration
2041-12-29

AI Technical Summary

Technical Problem

It is difficult for the existing microporous layers to effectively discharge water between the catalyst layer and the microporous layer at high current density, resulting in water overflow and reduced electrochemical performance.

Method used

A gas diffusion layer is designed that includes forming a concentration gradient through the passage and/or water-repellent resin in the thickness direction of the microporous layer to improve water repellency between the catalyst layer and the microporous layer, thereby effectively draining water at high current density.

Benefits of technology

By improving the water repellency between the catalyst layer and the microporous layer, water overflow is effectively suppressed, the smooth flow of gas is ensured, and the electrochemical performance and durability of fuel cells are improved.

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Abstract

The present invention provides a gas diffusion layer, a membrane electrode assembly, and a fuel cell. A gas diffusion layer, wherein the inner wall of a through passage in a microporous layer and a region adjacent to the through passage include more water-repellent binder resin than a region not adjacent to the through passage, thereby effectively discharging water generated by an electrochemical reaction. By using the gas diffusion layer of the present invention, a fuel cell can be obtained in which optimized water management can be performed and unit cell performance is improved, and which can smoothly operate under all humidity conditions including high humidification conditions and low humidification conditions.
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