以聚四氟乙烯（PTFE）为疏水剂,探讨分步浸渍联合真空干燥的疏水处理工艺对碳纤维纸的微观形貌和性能的影响。结果表明,采用分步超声浸渍结合真空干燥的方法获得负载10%的疏水碳纸综合性能最优,此时碳纸透气率为1760 mL∙mm/（cm2∙h∙mmAq）,电阻率为7.3 mΩ∙cm,接触角达到147 °,0.6 V电压下电流密度为1.52 A/cm2,综合性能优于国外商业疏水碳纸。红外光谱和XPS显示含F的化学键的存在降低了碳纸的表面能,显著地提高碳纸的疏水性。
Abstract
Using polytetrafluoroethylene （PTFE） as a hydrophobic agent, the effect of step-by-step impregnation combined with vacuum drying hydrophobic treatment process on the micromorphology and properties of carbon fiber paper was discussed. The results show that the hydrophobic carbon paper with a load of 10% is the best by ultrasonic secondary impregnation combined with vacuum drying, and the air permeability of the carbon paper is 1760 mL∙mm/（cm2∙h∙mmAq）, the resistivity was 7.3 mΩ∙cm, the contact angle reaches 147°, and the current density is 1.52 A/cm2 at 0.6 V, which is better than that of commercial Toray hydrophobic carbon paper. Infrared spectroscopy and XPS show that the presence of chemical bonds containing F reduces the surface energy of the carbon paper and significantly improves the hydrophobicity.
关键词
质子交换膜燃料电池 /
气体扩散层 /
碳纸 /
聚四氟乙烯 /
疏水改性 /
分步浸渍
Key words
proton exchange membrane fuel cells（PEMFC） /
gas diffusion layer /
carbon paper /
PTFE /
hydrophobic modification /
step-by-step impregnation
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基金
大连市重点科技研发计划（2023YF14GX021）
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