A preparation method with gradient hydrophilic or hydrophobic diffusion layer
A hydrophobic, diffusion layer technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems affecting the success rate and assembly efficiency of fuel cell stack assembly, brittle carbon fiber paper, poor flexibility, etc., to improve the service life. , The effect of reducing production energy consumption and time, improving performance and reliability
Active Publication Date: 2021-03-30
TSINGHUA UNIV
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Problems solved by technology
Therefore, this requires that the diffusion layer be in the lateral area, and its hydrophilicity and hydrophobicity should be adjusted gradiently; thirdly, carbon fiber paper is generally fragile and has poor flexibility, which directly affects the assembly success rate and assembly efficiency of fuel cell stacks
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[0041] like figure 2 Shown is the top view of the microporous layer side of the diffusion layer in the example; image 3 Shown is a cross-sectional view of the long side interface of the diffusion layer in the example. The specific production is as follows:
[0042] 1) The carbon fiber filaments are chopped with a fiber cutter, and the average length of the chopped carbon fibers is 15 mm.
[0043] 2) Place the chopped carbon fiber filaments in a mechanical stirrer, stir for 20 seconds, so that the chopped carbon fiber filaments are in an untwisted state, and then place the untwisted chopped carbon fiber filaments into the hot-pressing mold layer by layer, The packing size of the hot pressing mold is 350mm*280mm*0.25mm. A total of 5 layers of chopped carbon fiber filaments are stacked, and a mixture of phenolic resin powder and expandable graphite is added between each two layers; the filler quality is 8g of carbon fiber filaments, 1.7g of expandable graphite and 2.6g of po...
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Abstract
The invention discloses a preparation method of a diffusion layer with gradient hydrophilicity and hydrophobicity, and belongs to the technical field of proton exchange membrane fuel cell part processing. The preparation method is a preparation process of the carbon fiber paper without carbonization / graphitization, the prepared carbon fiber paper is used as a matrix layer, then a gradient microporous layer is prepared on the surface of the prepared carbon fiber paper, and the gradation is mainly reflected in the transverse hydrophilicity / hydrophobicity gradation and the longitudinal hydrophilicity / hydrophobicity gradation. In addition, in the preparation process of the microporous layer, some auxiliary additives capable of prolonging the service life of the fuel cell are additionally added, so that the service life of the fuel cell is prolonged. The gradient treatment of the microporous layer is not only reflected in the longitudinal direction of the carbon paper, but also reflected inthe transverse direction of the carbon paper, the hydrophilic and hydrophobic management of different areas of the fuel cell is comprehensively considered, and the performance and reliability of thefuel cell are improved to the maximum extent.
Description
technical field [0001] The invention belongs to the technical field of proton exchange membrane fuel cell parts processing, and in particular relates to a preparation method of a gradient hydrophilic / hydrophobic diffusion layer. Background technique [0002] With the rapid development of social economy, the demand for energy is increasing and the problem of environmental pollution is becoming more and more serious. The development of efficient, reliable and environment-friendly green energy has attracted the attention of all countries. Proton exchange membrane fuel cells have gradually become the focus of research because of their high efficiency, zero emissions, low start-up temperature and fast start-up. The gas diffusion layer (GDL) is composed of a matrix layer with a relatively loose pore structure and a micro-porous layer (MPL) with a compact pore structure. As one of the most important components of a fuel cell, GDL not only plays a role in supporting the catalytic l...
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IPC IPC(8): H01M4/88
CPCH01M4/8807Y02E60/50
Inventor 雷一杰王诚王建龙唐亚平
Owner TSINGHUA UNIV