Electrochemical double layer capacitors (EDLCs) are promising high power energy
sources for many different applications where high power density, high cycle efficiency and long
cycle life are needed. However, because the energy density of EDLCs is small compared to that of
rechargeable batteries one needs to increase the capacitance of EDLCs. The nanofiber diameters
range from 50 nm to 400 nm, depending on the concentration of polymer solution types,
tip-to-collector distance, applied voltage, and viscosity of the solution. The main advantage of the
electrospinning process is that it is a simple means to prepare continuous fibers with unusually large
surface to volume ratios and pore structure surfaces. So, feature of nanofiber webs are the high
specific surface area developed by creating pores on the nanofiber surface. In this work, the
multiwalled carbon nanotubes embedded polyacrylonitrile solutions in N,N-dimethylformamide
(DMF) were electrospun to be webs consisting of 350 nm ultrafine nanofibers, which were used to
produce a series of activated carbon nanofibers with developed mesoporosity and high electrical
conductivity through stabilization, carbonization-activation processes.
