Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/120725
Title: A study of carbon nanofibers and active carbon as symmetric supercapacitor in aqueous electrolyte: a comparative study
Author: Daragmeh, Allan
Hussain, Shahzad
Saadeddin, Iyad
Servera Serapio, Llorenç
Xuriguera Martín, María Elena
Cornet i Calveras, Albert
Cirera Hernández, Albert
Keywords: Nanoestructures
Electròlits
Carbó activat
Nanostructures
Electrolytes
Activated carbon
Issue Date: 29-Dec-2017
Publisher: SpringerOpen
Abstract: Symmetric supercapacitors are fabricated by carbon nanofibers (CNF) and activated carbon (AC) using similar proportions of 7 wt% polyvinylidene fluoride (PVDF) polymer binder in an aqueous electrolyte. In this study, a comparison of porous texture and electrochemical performances between CNFs and AC based supercapacitors was carried out. Electrodes were assembled in the cell without a current collector. The prepared electrodes of CNFs and AC present Brunauer-Emmett-Teller (BET) surface area of 83 and 1042 m2/g, respectively. The dominant pore structure for CNFs is mesoporous while for AC is micropore. The results showed that AC provided higher specific capacitance retention up to very fast scan rate of 500 mV/s. AC carbon had a specific capacitance of 334 F/g, and CNFs had 52 F/g at scan rate 5 mV/s in aqueous solution. Also, the results indicate the superior conductivity of CNFs in contrast to AC counterparts. The measured equivalent series resistance (ESR) showed a very small value for CNFs (0.28 Ω) in comparison to AC that has an ESR resistance of (3.72 Ω). Moreover, CNF delivered higher specific power (1860 W/kg) than that for AC (450 W/kg). On the other hand, AC gave higher specific energy (18.1 Wh/kg) than that for CNFs (2 Wh/kg).This indicates that the AC is good for energy applications. Whereas, CNF is good for power application. Indeed, the higher surface area will lead to higher specific capacitance and hence higher energy density for AC. For CNF, lower ESR is responsible for having higher power density.
Note: Reproducció del document publicat a: https://doi.org/10.1186/s11671-017-2415-z
It is part of: Nanoscale Research Letters, 2017, vol. 12, num. 639
URI: http://hdl.handle.net/2445/120725
Related resource: https://doi.org/10.1186/s11671-017-2415-z
ISSN: 1931-7573
Appears in Collections:Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)

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