High electrochemical performance flexible solid-state supercapacitor based on Co-doped reduced graphene oxide and silk fibroin composites

Rath, Tanmoy and Pramanik, Nilkamal and Kumar, Sandeep (2017) High electrochemical performance flexible solid-state supercapacitor based on Co-doped reduced graphene oxide and silk fibroin composites. In: Energy, 141 . pp. 1982-1988. ISSN 03605442

PDF ene_141_1982-1988_2017.pdf - Published Version Restricted to Registered users only Download (1MB) | Request a copy

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. © 2017 Elsevier Ltd

Item Type:	Journal Article
Publication:	Energy
Publisher:	Elsevier Ltd
Additional Information:	The copyright of this article belongs to the Elsevier Ltd.
Keywords:	Co-doped reduced graphene oxide(Co-rGO); Electrochemical performance; Flexible electrode; Ionic liquid electrolyte; Supercapacitor
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Biosystems Science and Engineering
Date Deposited:	30 May 2022 04:50
Last Modified:	30 May 2022 04:50
URI:	https://eprints.iisc.ac.in/id/eprint/72834

Actions (login required)

View Item