A porous transport layer, sometimes referred to as gas diffusion layer (GDL) or current collector, has multiple functionalities that influence performance and durability of the electrochemical device. An ideal porous transport layer should:
- Enable efficient flow of gaseous/liquid reactants/products
- Have high electrical, and thermal, conductivity
- Be corrosion resistant towards the specific environment
- Have tuned interface towards other components such as membrane and electro-catalys