Ultrasonic Spraying Fuel Cell GDL Ultrasonic Spraying Fuel Cell GDL – Coating Gas Diffusion Layer Maximizing the use of GDL in the Fuel Cell by ultrasonic spray application The Gas Diffusion Layer (GDL) plays several critical roles in a typical fuel cell application and is often integrated as part of the Membrane Electrode Assembly (MEA). Typical applications that use GDLs consist of Polymer Electrolyte Fuel Cells (PEMFC) and Direct Methanol Fuel Cells (DMFC). When a GDL is coated with a catalyst it is than referred to as a Gas Diffusion Electrode (GDE), which are sometimes sold or installed separately from the Membrane or MEA. Acting as an electrode is the easy part of the GDL/GDE, though. The GDL is a porous structure made by weaving carbon fibers into a carbon cloth (e.g. GDL-CT and ELAT) or by pressing carbon fibers together into a carbon paper (e.g. Sigracet, Freudenberg, and Toray).Many of the standard GDLs that are produced today come with a Micro Porous layer ...