Graphene–graphite polyurethane composite based high‐energy density flexible supercapacitors

Manjakkal, L. , Navaraj, W. T., García Núñez, C. and Dahiya, R. (2019) Graphene–graphite polyurethane composite based high‐energy density flexible supercapacitors. Advanced Science, 6(7), 1802251. (doi:10.1002/advs.201802251) (PMID:30989034) (PMCID:PMC6446598)

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Abstract

Energy autonomy is critical for wearable and portable systems and to this end storage devices with high‐energy density are needed. This work presents high‐energy density flexible supercapacitors (SCs), showing three times the energy density than similar type of SCs reported in the literature. The graphene–graphite polyurethane (GPU) composite based SCs have maximum energy and power densities of 10.22 µWh cm−2 and 11.15 mW cm−2, respectively, at a current density of 10 mA cm−2 and operating voltage of 2.25 V (considering the IR drop). The significant gain in the performance of SCs is due to excellent electroactive surface per unit area (surface roughness 97.6 nm) of GPU composite and high electrical conductivity (0.318 S cm−1). The fabricated SCs show stable response for more than 15 000 charging/discharging cycles at current densities of 10 mA cm−2 and operating voltage of 2.5 V (without considering the IR drop). The developed SCs are tested as energy storage devices for wide applications, namely: a) solar‐powered energy‐packs to operate 84 light‐emitting diodes (LEDs) for more than a minute and to drive the actuators of a prosthetic limb; b) powering high‐torque motors; and c) wristband for wearable sensors.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Dahiya, Professor Ravinder and Garcia Nunez, Dr Carlos and Navaraj, Mr William and Manjakkal, Dr Libu
Authors: Manjakkal, L., Navaraj, W. T., García Núñez, C., and Dahiya, R.
College/School:College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Advanced Science
Publisher:Wiley
ISSN:2198-3844
ISSN (Online):2198-3844
Published Online:13 February 2019
Copyright Holders:Copyright © 2019 The Authors
First Published:First published in Advanced Science 6(7):1802251
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
3017280Engineering Fellowships for Growth: Printed Tactile SKINRavinder DahiyaEngineering and Physical Sciences Research Council (EPSRC)EP/R029644/1ENG - Electronics & Nanoscale Engineering