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

Manjakkal, L., Navaraj, W.T. ORCID: 0000-0003-4753-2015, Nunez, C.G. and Dahiya, R., 2019. Graphene–graphite polyurethane composite based high‐energy density flexible supercapacitors. Advanced Science, 6 (7): 1802251. ISSN 2198-3844

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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: Journal article
Publication Title: Advanced Science
Creators: Manjakkal, L., Navaraj, W.T., Nunez, C.G. and Dahiya, R.
Publisher: Wiley‐VCH Verlag
Date: 3 April 2019
Volume: 6
Number: 7
ISSN: 2198-3844
Identifiers:
NumberType
10.1002/advs.201802251DOI
Rights: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Divisions: Schools > School of Science and Technology
Depositing User: Linda Sullivan
Date Added: 14 Aug 2019 10:24
Last Modified: 14 Aug 2019 10:24
URI: http://irep.ntu.ac.uk/id/eprint/37300

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