Gas diffusion layers coated with a microporous layer containing hydrophilic carbon nanotubes for performance enhancement of polymer electrolyte fuel cells under both low and high humidity conditions

摘要: Abstract Gas diffusion layers (GDLs) coated with a hydrophobic microporous layer (MPL) composed of carbon black and polytetrafluoroethylene (PTFE) have been commonly used to improve the water management characteristics polymer electrolyte fuel cells (PEFCs). However, MPL GDL designed prevent dehydration membrane under low humidity conditions is generally inferior at reducing flooding high conditions. It therefore important develop robust that can enhance PEFC performance regardless In present study, an containing hydrophilic nanotubes (CNTs) was developed. The less pores incorporating CNTs are effective conserving also expelling excess from catalyst while maintaining oxygen flow pathways substrate, allowing mean pore diameter be decreased 2 μm without ability An CNT content 4 mass% exhibits significantly higher both than GDL.