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Improved electrochemical performance of free standing electrospun graphene incorporated carbon nanofibers for supercapacitor

Dipti V Jamkar, Balkrishna J. Lokhande, Subhash B Kondawar


In this paper, we report the fabrication of carbon nanofibers (CNFs) by electrospinning of polyacrylonitrile (PAN) solution in N,N-dimethylformamide (DMF)with different concentrations followed by stabilization and carbonization in a tubular quartz furnace. To improve the electrochemical performance, graphene nanosheets have been used to prepare porous graphene/carbon nanofibers (G-CNFs). The morphology of the porous G-CNFs were characterized by means of scanning electron microscopy (SEM). Diameter of CNFs and G-CNFs were found to be in the range of 400 – 500 nm reveals the fibers in nanoscale with high porosity. The electrochemical performance of as-synthesized CNFs and G-CNFs was studied by cyclic voltammetry (CV), galvanostatic charge discharge (GCD) and electrochemical impedance spectroscopy. The CV curve of the pure CNFs show distorted rectangular shape whereas CV curve of G-CNFs exhibit a nearly rectangle-shaped profile which is the characteristic of an ideal electric double-layer capacitor. The improved electrochemical performance of G-CNFs is due to the improved internal electrical conductivity of G-CNFs via graphene nanosheets interlaying.


Carbon nanofibers; graphene; electrospinning; electrochemical performance; supercapacitor

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ISSN 2394-0867