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High electrochemical performance flexible solid-state supercapacitor based on Co-doped reduced graphene oxide and silk fibroin composites
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Rath, Tanmoy, Pramanik, Nilkamal and Kumar, Sandeep (2017) High electrochemical performance flexible solid-state supercapacitor based on Co-doped reduced graphene oxide and silk fibroin composites. Energy, 141 . pp. 1982-1988. doi:10.1016/j.energy.2017.11.126 ISSN 0360-5442.
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Official URL: http://dx.doi.org/10.1016/j.energy.2017.11.126
Abstract
A simple method for the preparation of flexible supercapacitor based on Co-doped reduced graphene oxide (rGO) and silk fibroin composites film is reported. The facile and cost-effective green pathways are chosen to reduce the exfoliated graphite oxide using a microbial strain, at room temperature. Doping process is performed by using in-situ precipitation technique. The Co-doped reduced graphene oxide (Co-rGO) is characterized by X-ray diffraction, Raman spectroscopy and Scanning Electron Microscopy (SEM). The as-prepared Co-rGO and silk fibroin are used to prepare flexible electrode for supercapacitor device. Electrochemical performance of the electrode is examined using cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. The fabricated supercapacitor shows the specific capacitance of 104 F g−1 at a current density of 0.5 A g−1 in ionic liquid electrolyte (EMIm+BF4−). After a charge–discharge rate of 1 A g−1 for 10,000 cycles, the Co-rGO film exhibits remarkable electrochemical stability with the capacitance retention ratio of 89%. Furthermore, the Co-rGO film based supercapacitor achieves high energy density up to 28.31 Wh kg−1 at a power density of 78.24 kW kg−1 by using the ionic liquid electrolyte. The results shown in this work indicate that our proposed Co-rGO-silk fibroin composites film is a promising electrode material for manufacturing flexible supercapacitors.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
Journal or Publication Title: | Energy | ||||||||
Publisher: | Elsevier | ||||||||
ISSN: | 0360-5442 | ||||||||
Official Date: | December 2017 | ||||||||
Dates: |
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Volume: | 141 | ||||||||
Page Range: | pp. 1982-1988 | ||||||||
DOI: | 10.1016/j.energy.2017.11.126 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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