| Summary: | 碩士 === 逢甲大學 === 材料科學與工程學系 === 103 === Gas diffusion layer (GDL) is make by carbon paper or carbon cloth, which is one of the important components of proton exchange membrane fuel cell (PEMFC). GDL have outstanding conductivity, air permeability, corrosion resistance, and mechanical strength, so it can be endure for PEMFC’s environment. During cell operating, GDL is coated by micro porous layer (MPL) to improve the water flooding, MPL slurry is consist of carbon black, Teflon, dispersant. MPL coating process including spraying, blading, screen printing in currently. This study discussed the manufacturing process of the GDL by blading MPL on carbon cloth substrate with two parts.
In part one, the GDL coated with MPL was adjust different Teflon/ carbon black ratio and investigated the effect of different Teflon/carbon black on fuel cell performance. An appropriate ratio cause the MPL loading more complete and improve the GDL’s hydrophobic. In addition to appropriate ratio can be suitable on blading. In Teflon/carbon black ratio at 18, The best fuel cell performance was 870 mA/cm2 at a load of 0.3 V .
In part two, using different coating gaps (75 µm, 100 µm, 350 µm) to blade the MPL slurry on carbon cloth. We examined the effect of different coating gaps of blade on fuel cell. The higher coating gap cause GDL’s air permeability. The best fuel cell performance was 629 mA/cm2 at a load of 0.3 V with the coating gap for 100 µm.
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