A hydrophobic microporous layer for a fuel cell and a method of making the same

CN122455797APending Publication Date: 2026-07-24SHANGHAI INST OF SPACE POWER SOURCES

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: SHANGHAI INST OF SPACE POWER SOURCES
Filing Date: 2026-04-28
Publication Date: 2026-07-24

AI Technical Summary

Technical Problem

In existing fuel cells, the PTFE microporous layer suffers from problems such as weak bonding, easy detachment, difficulty in uniform dispersion, high production energy consumption, and high cost.

Method used

Hydrophobic microporous layers are prepared by hydroxylating carbon materials and using silane coupling agents to form covalent grafts with hydroxyl groups on the surface of carbon materials, thus avoiding high-temperature sintering and ensuring that hydrophobic groups are firmly anchored on the substrate surface.

Benefits of technology

It achieves a firm bond to the hydrophobic microporous layer, eliminating the risk of detachment, maintaining unobstructed gas-liquid transmission channels, increasing voltage and peak power density, and reducing production energy consumption and costs.

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Abstract

The application discloses a hydrophobic microporous layer for a fuel cell and a preparation method thereof, the fuel cell comprising a gas diffusion layer and a catalytic layer, the gas diffusion layer comprising a substrate layer and the hydrophobic microporous layer, and the hydrophobic microporous layer being located between the substrate layer and the catalytic layer, and the method comprising the following steps: step 1, performing a hydroxylization treatment on the surface of a carbon material to obtain a hydroxylized carbon material; step 2, reacting the hydroxylized carbon material and a silane coupling agent in a solvent to obtain a hydrophobic microporous layer slurry, wherein the silane coupling agent is one or more of n-octyl triethoxysilane, triethoxy-1H, 1H, 2H, 2H-tridecafluoro-n-octylsilane, phenyl triethoxysilane and methyl triethoxysilane; and step 3, mixing the hydrophobic microporous layer slurry with a binder, coating the mixture on the surface of the substrate layer, and drying to obtain the hydrophobic microporous layer. The hydrophobic microporous layer prepared by the application has no risk of falling off and has strong drainage capacity, and can ensure that a gas-liquid transmission channel is unblocked, so that the voltage and the peak power density are improved.

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