Polyacrylonitrile (PAN), cellulose, or pitch are the three commonly used polymeric precursors for the fabrication of carbon fibers. Among them, PAN is the most commonly used polymer, owing to its high carbon yield (upto 56%), and flexibility. Moreover, polyvinyl alcohol (PVA), polyimides (PIs), polybenzimidazole, poly(vinylidene fluoride), phenolic resin, and lignin has also be explored for the fabrication of CNFs .