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All-porous heterostructure of reduced graphene oxide-polypyrrole-nanoporous gold for planar flexible supercapacitor showing outstanding volumetric capacitance and energy density

Abstract

A facile electrochemical method for the fabrication of planar, all-solid-state flexible supercapacitor with reduced graphene oxide-polypyrrole hybrid platform has been explored. Three-dimensional reduced graphene oxide (3DrGO) followed by a conducting polymer, polypyrrole (PPy) network has been deposited on a pristine nanoporous gold (npAu) on chip. The all-solid- state, flexible, symmetric supercapacitor (PPy-3DrGO/npAu) exhibited a highest areal capacitance of 29.21 mF cm-2. The all-porous morphology of the electrode with in-plane geometry renders an overwhelming volumetric stack capacitance of 245.34 F cm-3 of the device. The solid-state device was assembled in ambient condition with aqueous gel electrolyte without “dry room”, required for packaging of all commercial capacitor. An unprecedented energy density of about 98.48 mW h cm-3 was observed with the highest power density of 19.68 W cm-3. The PPy-3DrGO based in-plane MSC device also showed excellent cycling stability with the retention of 87.2% with respect to the initial capacitance after 10000 galvanostatic charge-discharge cycles, which is one of the highest cycling performance reported till date with conducting polymer-based symmetric devices. A negligible change in the current response of the continuously bent flexible MSC, shows its excellent mechanical robustness and durability for long-run device performances. Interestingly, the fully charged device was able to show excellent storage property for a long period of time and can light up commercial LED, making it a potential power source option to be implemented in wearable or portable commercial electronic devices.

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Publication details

The article was received on 06 Aug 2018, accepted on 12 Oct 2018 and first published on 12 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA07627H
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    All-porous heterostructure of reduced graphene oxide-polypyrrole-nanoporous gold for planar flexible supercapacitor showing outstanding volumetric capacitance and energy density

    T. Purkait, G. Singh, N. Kamboj, M. Das and R. S. Dey, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA07627H

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