Gas diffusion layer and preparation method

Abstract

The invention discloses a gas diffusion layer and a preparation method thereof. The preparation method of the gas diffusion layer comprises steps that a conductive material is added into carbon fibersuspension slurry, and a carbon fiber base material is obtained; the carbon fiber base material is treated to obtain a conductive porous base material; a hydrophobic layer is formed on the conductiveporous base material to obtain a hydrophobic conductive porous base material; and a microporous layer is formed on the hydrophobic conductive porous substrate to obtain the gas diffusion layer. In theprocess of preparing the carbon fiber base material, the conductive material is directly added into the carbon fiber suspension slurry, so the conductive material can be uniformly distributed in thecarbon fiber base material, the conductive material and the carbon fiber can be better combined, the whole carbon fiber base material has conductivity, and performance of the gas diffusion layer is further improved. Time consumption caused by coating of the guide material can be avoided, so the production time can be saved, and production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a gas diffusion layer and a preparation method. Background technique [0002] The gas diffusion layer plays an important role in supporting the catalytic layer, collecting current, conducting gas and discharging the reaction product water in the fuel cell. The traditional gas diffusion layer includes a carbon fiber substrate and a microporous layer coated on the carbon fiber substrate. Since the gas diffusion layer needs to have good electrical conductivity, it is necessary to conduct conductive treatment on the carbon fiber substrate. The traditional method is to coat a layer of conductive material on the surface of the carbon fiber substrate to make the carbon fiber substrate conductive. It can be seen that the traditional method can only make the surface of the carbon fiber substrate conductive, but cannot make the whole carbon fiber substrate conductive, thus affecting th...

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Problems solved by technology

[0003] The main purpose of the present invention is to provide a gas diffusion layer and a preparation method, aiming at solving the problem that the conductive treatment in the prior art can only make the surface of the carbon fiber substrate conductive, but cannot make the whole carbon fiber substrate conductive. Technical issues that affect the performance of the gas diffusion layer

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