气体扩散层
科德宝是全球领先的非织造布供应商。基于其高科技产品组合，科德宝为所有聚合物电解质膜燃料电池 (PEMFC) 和直接甲醇燃料电池 (DMFC) 应用提供 GDL 材料。
GDL 材料是燃料电池中的性能关键部件之一，既可作为膜电极组件 (MEA) 的功能结构，也可作为支撑结构。
GDL 材料的卓越特性：科德宝 GDL 材料具有高导电性和导热性，保护膜免受潜在的穿刺损坏，允许在 MEA 制造中进行安全且高效的下游加工，并根据燃料电池运行条件为优化质量传输而量身定制。这种优化确保向催化剂层提供足够的氢气和氧气（空气）气体反应物。同时，必须控制气态和液态产物水的运动，以保持催化剂位点对反应物开放，同时防止膜变干。
这种最重要的水管理主要是通过我们特殊配方的微孔层 (MPL) 涂层和处理来实现的，这些涂层和处理具有导电性和导热性以及疏水性的完美平衡。最新一代的科德宝 GDL 涵盖了广泛的应用；用于汽车，需要改进的冷启动行为和非常高的质量传输能力，以实现高电流密度运行，用于高湿度的固定系统，以及在开式阴极备用电源燃料电池中预期的极度干燥的运行条件。
应用科德宝发明的无纺布技术，我们的 GDL 独特的三维纤维结构满足了这些具有挑战性的质量传输要求，此外还提供了机械可压缩性，有助于适应双极板和膜等电池堆组件的厚度变化。
请参阅我们的应用顾问文件，为您的燃料电池应用选择合适的材料。除了燃料电池，科德宝的碳纤维基非织造布也非常适用于其他应用，例如水解或储能。
Gas Diffusion Layers
Freudenberg is worldwide the leading nonwoven supplier. Based on its high technology portfolio Freudenberg supplies GDL materials for all polymer electrolyte membrane fuel cell (PEMFC) and direct methanol fuel cell (DMFC) applications.
GDL materials are one of the performance critical components in fuel cells acting both as the functional as well as the supporting structure for membrane electrode assembly (MEA).
Superior characteristics of GDL materials: Freudenberg GDL materials exhibit high electrical and thermal conductance, protect the membrane from potential puncture damage, allow safe and productive downstream processing in MEA manufacturing, and are tailored for optimized mass transport according to the fuel cell operating conditions. This optimization ensures sufficient supply of the hydrogen and oxygen (air) gas reactants to the catalyst layers. Concurrently the movement of product water in gas and liquid states must be managed to keep catalyst sites open for reactants while preventing membrane dry-out.
This all-important water management is primarily achieved through our specially formulated micro-porous layer (MPL) coatings and treatments that have the perfect balance of electrical and thermal conductivity and hydrophobicity. The latest generation of Freudenberg GDL covers a wide range of applications; for automotive, which requires improved cold start behavior and very high mass transport capability for high current density operation, for highly humidified stationary systems, and for extremely dry operation conditions expected in open cathode back-up power fuel cells.
Applying the nonwoven technology invented by Freudenberg, our GDL's unique three dimensional fiber structures meet these challenging mass transport requirements and furthermore offer mechanical compressibility that helps to accommodate thickness variations of cell stack components such as bipolar plates and membrane.
Please see our application advisor document to select appropriate materials for your fuel cell application. Besides for fuel cells, Freudenberg's carbon fiber based nonwovens are well suitable for other applications such as hydrolysis or energy storage as well.
https://fuelcellcomponents.freudenberg-pm.com/Products/gas-diffusion-layers
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