“…11 The concept of using composites loaded with NFs as a hydrogen barrier is not new, nor is the implementation of graphene and its derivatives (e.g., graphene nanoplatelets -GNPs). 12,13 GNPs are characterized by voids of 0.064 nm, 14 much smaller than the diameter of hydrogen molecules (0.314 nm) 13,15 and, therefore, are an ideal candidate for blocking hydrogen propagation. Despite these attractive properties of graphene, only a few studies have explored its application in polymer composites as coatings against hydrogen permeation.…”