Gas diffusion layer of proton exchange membrane fuel cell
A technology of gas diffusion layer and proton exchange membrane, which is applied in the direction of fuel cells, electrical components, battery electrodes, etc., can solve the problems of large thickness of gas diffusion layer, reduction of stack mass and volume power density, high manufacturing cost, etc., and achieve optimal water efficiency. Management and thermal management, ensuring consistency, increasing the effect of reactant gas mass transfer
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[0047] Example 1
[0048] The gas diffusion layer 1 of the proton exchange membrane fuel cell has a thickness of 200 μm and an average porosity of 0.79. Suitable for direct flow or winding flow, such as figure 1 , figure 2 , image 3 , Figure 5 with Image 6 As shown, the gas diffusion layer 1 of the proton exchange membrane fuel cell is made of carbon fiber, and the entire gas diffusion layer needs to undergo hydrophobic treatment to ensure its drainage performance. The hydrophobic substance 2 with gradient distribution along the straight or meandering flow channel entrance to exit direction, the content of the hydrophobic substance gradually increases, and the mass content of PTFE ranges from 19 to 21% by weight. figure 1 with image 3 In, the darker the color, the higher the content of hydrophobic substance 2. The structure of the gas diffusion layer structure 3 under the plate ridge and the gas diffusion layer structure 4 under the plate flow channel are different. The ga...
Example Embodiment
[0054] Example 2
[0055] The structure of the gas diffusion layer of the proton exchange membrane fuel cell is basically the same as that of Example 1, such as Figure 4 As shown, the difference is that this embodiment is suitable for a serpentine flow channel. The content of the hydrophobic substance 2 of the gas diffusion layer gradually increases in different flow channels along the direction from the inlet end to the outlet end. In the serpentine flow channel, The water content of different flow channels is different from the inlet end to the outlet end of the channel, and the water content of the flow channel from the inlet end to the outlet end gradually increases. Therefore, the content distribution of the hydrophobic substance 2 in the gas diffusion layer can ensure consistent water distribution in the fuel cell Sex.
[0056] The invention can improve the consistency of water distribution and temperature distribution in the working state of the straight or serpentine flow ...
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