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Journal of Applied Electrochemistry

, Volume 49, Issue 1, pp 79–86 | Cite as

Ionic liquid-based high-voltage flexible supercapacitor for integration with wearable human-powered energy harvesting system

  • Ke He
  • Ting Chong Wong
  • Gih Sheng LauEmail author
Research Article
  • 101 Downloads

Abstract

In this work, we report the fabrication of a high-voltage flexible supercapacitor that is able to store energy harvested from a 3D-printed wearable human motion energy harvester and provide power supply to other wearable devices. To bestow the electrode with flexibility, poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) is incorporated with single-walled carbon nanotube (SWCNT) as electrode material, which dramatically decreases its Young’s modulus. Furthermore, the supercapacitor is sandwiched between self-healing layers that protects the device from mechanical failure caused by motion when mounted on the human body as wearable device. Owing to the use of ionic liquid, 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF4), as the electrolyte, the supercapacitor can be charged up to 2.5 V. This wide electrochemical window, with low equivalent series resistance (ESR), enhances the power and energy densities of the supercapacitor to 11 kW kg− 1 and 23 Wh kg− 1. The device presents excellent flexibility and mechanical durability. We realized a wearable self-powered and self-sustaining system by the integration of the as-prepared supercapacitor with a 3D-printed mechanical energy harvesting knee brace. Harvested energy generated by a tester wearing the system was sufficient to light up an LED light in a demonstration.

Graphical abstract

Keywords

Supercapacitor Energy harvesting Ionic liquid Wearable Flexible supercapacitor 

Notes

Acknowledgements

This work was supported by Ministry of Education Singapore under the Translational R&D and Innovation Fund grant number MOE2014-TIF-1-G-010.

Supplementary material

10800_2018_1274_MOESM1_ESM.docx (1.5 mb)
Supplementary material 1 (DOCX 1507 KB)

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.School of EngineeringRepublic PolytechnicSingaporeSingapore
  2. 2.School of Materials Science and EngineeringNanyang Technological UniversitySingaporeSingapore

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