Flexible self-charging supercapacitor based on graphene-Ag-3D graphene foam electrodes

Manjakkal, L. , García Núñez, C. , Dang, W. and Dahiya, R. (2018) Flexible self-charging supercapacitor based on graphene-Ag-3D graphene foam electrodes. Nano Energy, 51, pp. 604-612. (doi:10.1016/j.nanoen.2018.06.072)

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Abstract

A flexible three-dimensional porous graphene foam-based supercapacitor (GFSC) is presented here for energy storage applications. With a novel layered structure of highly conductive electrodes (graphene-Ag conductive epoxy–graphene foam), forming an electrochemical double layer, the GFSC exhibits excellent electrochemical and supercapacitive performance. At a current density of 0.67 mA cm−2, the GFSCs show excellent performance with areal capacitance (38 mF cm−2) about three times higher than the values reported for flexible carbon-based SCs. The observed energy and power densities (3.4 µW h cm−2 and 0.27 mW cm−2 respectively) are better than the values reported for carbon-based SCs. Analyzed under static and dynamic bending conditions, the GFSCs are stable with up to 68% capacitance retention after 25000 charge–discharge cycles. The light-weight, cost-effective fabrication and no self-heating make the GFSCs a promising alternative to conventional source of energy in the broad power density ranging from few nW cm−2 to mW cm−2. In this regard, GFSC was integrated with a flexible photovoltaic cell resulting in a flexible self-charging power pack. This pack was successfully utilized to power continuously a wearable CuO nanorod based chemi-resistive pH sensor.

Item Type:Articles
Additional Information:Also funded by the Scottish Funding Council through SFC-GCRF (SFC/AN/15/2016) project on Energy Autonomous Bio-Sensor Patch suited for Affordable Self-Health Monitoring.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Dahiya, Professor Ravinder and Garcia Nunez, Dr Carlos and Dang, Ms Wenting and Manjakkal, Dr Libu
Authors: Manjakkal, L., García Núñez, C., Dang, W., and Dahiya, R.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Nano Energy
Publisher:Elsevier
ISSN:2211-2855
ISSN (Online):2211-3282
Published Online:25 June 2018
Copyright Holders:Copyright © 2018 The Authors
First Published:First published in Nano Energy 51:604-612
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
663861Engineering Fellowships for Growth: Printed Tactile SKINRavinder DahiyaEngineering and Physical Sciences Research Council (EPSRC)EP/M002527/1ENG - ENGINEERING ELECTRONICS & NANO ENG