“…Among them, carbon-based llers are the more widely studied ones, such as: (1) multi-walled carbon nanotubes (MWCNTs), 59,60,76 (2) graphene, 60,[76][77][78] (3) carbon nanobers (CNFs), 55,59 (4) conductive carbon black (CBs). [64][65][66][67]79,80 It is worth mentioning that, unlike nanoscale conductive llers, micron-sized carbon bers are oen used in composite bipolar plates not as additives but as the main body of the conductive phase, which plays a role similar to that of graphite. 47,61,63,[81][82][83][84][85] Most nanollers have excellent intrinsic conductivity, which can not only ll the gaps between the particles of composite BPs, but also improve the conductive pathway in the composite BPs, so they can enhance the electrical conductivity of the composite BPs without decreasing the mechanical properties.…”