It is known that carbon nano fibers are known recently. However I am unable find its probable applications. Some suggestions are in fuel cell. What are the others.
Jong and Geus (paper attached) suggested applications such as polymer additive, support material for catalyst, etc. Please read the paper to get the full information.
You can reach a recent Review from Su and co-workers in Chemical Review (Nanocarbons for the development of advanced catalysts, Chem. Rev. 113, 5782 (2013)) regarding the potential applications of CNTs/CNFs. The CNFs can be steadily used in place of CNTs for the referenced reactions.