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High surface area carbon nanofibers derived from electrospun PIM-1 for energy storage applications.
- Source :
- Journal of Materials Chemistry A; 2014, Vol. 2 Issue 2, p418-424, 7p
- Publication Year :
- 2014
-
Abstract
- Electrochemical double layer capacitors (EDLCs) utilize electrodes with high surface area to achieve high-energy storage capability. In this study, flexible and freestanding carbon nanofibers derived from PIM-1, a microporous polymer with high free volume, were prepared by pyrolysis of the electrospun polymer. A BET surface area of 546 m<superscript>2</superscript> g<superscript>−1</superscript> was obtained upon carbonization of the electrospun PIM-1 fibers. After further heat treatments such as steam-activation and annealing, the surface area increased to 1162 m<superscript>2</superscript> g<superscript>−1</superscript>. These carbon fibers were directly used as electrodes without the use of binders in a coin cell (CR2032) configuration and were characterized by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy. The activated and annealed fibers gave a specific capacitance of 120 F g<superscript>−1</superscript> at a scan rate of 10 mV s<superscript>−1</superscript> using 1,3-ethylmethylimidizaolium bis(trifluoromethanesulfonyl)imide as the ionic liquid electrolyte. From the galvanostatic charge–discharge test, the supercapacitor exhibited energy and power densities of 60 W h kg<superscript>−1</superscript> (active material) and 1.7 kW kg<superscript>−1</superscript>, respectively, at a current density of 1 A g<superscript>−1</superscript>. High power application of this device was demonstrated by its 77% retention of the energy density (47 W h kg<superscript>−1</superscript>) at a higher discharge current density of 5 A g<superscript>−1</superscript>. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 2
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 100392112
- Full Text :
- https://doi.org/10.1039/c3ta13779a