Gas diffusion layer of fuel cell and processing method

Abstract

The invention provides a gas diffusion layer of a fuel cell and a processing method, and a plurality of micro-pit textures are uniformly distributed on the surface of one side, close to a bipolar plate, of the gas diffusion layer and used for preventing reaction water from blocking gaps of the gas diffusion layer. The micro-pit textures are spherical crowns and distributed on the surface of the gas diffusion layer at equal intervals, and the center distance S between every two adjacent micro-pit textures is equal to 150-1000 micrometers. The ratio of the micro-pit textures to the total area ofthe surface of the gas diffusion layer is 10%-45%. The edge of any micro-pit texture is provided with a chamfer inclining outwards, and the chamfer is used for improving the water resistance of the gas diffusion layer. By changing the micro-structure of the surface of one side, close to the polar plate, of the cathode gas diffusion layer, micro pits which are uniformly distributed and have certain angles on the periphery are formed, so that liquid water on the surface of the gas diffusion layer is easier to gather at the micro pits, and the fuel cell is prevented from being flooded.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell gas diffusion layer and a processing method. Background technique [0002] With the continuous development of automobile industry technology, fuel cells are gradually emerging to solve the problems of large emissions from internal combustion engine vehicles and short cruising range of pure electric vehicles. Proton exchange membrane fuel cell (PEMFC) has the advantages of low operating temperature, fast start-up speed, low noise, high specific power, etc., and has become a research hotspot all over the world. But at the same time, many problems of its own also limit the development of PEMFC, such as high cost, hydrogen storage and transportation problems, and unstable system operation. [0003] As one of the important components of the fuel cell system, the gas diffusion layer (GDL) plays an important role in supporting the catalytic layer, collecting current, con...

AI Technical Summary

Problems solved by technology

This method has the problems of limited service life and difficult preparation, and is not suitable for fuel cell systems that work continuously for a long time

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