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Open AccessArticle

Stretchable Supercapacitors Based on Carbon Nanotubes-Deposited Rubber Polymer Nanofibers Electrodes with High Tolerance against Strain

1
Department of Chemical and Biological Engineering, Gachon University, Seongnam, Gyeonggi 13120, Korea
2
Device & System Research Center, Samsung Electronics, Suwon, Gyeonggi 443-803, Korea
*
Authors to whom correspondence should be addressed.
Nanomaterials 2018, 8(7), 541; https://doi.org/10.3390/nano8070541
Received: 25 June 2018 / Revised: 13 July 2018 / Accepted: 17 July 2018 / Published: 18 July 2018
We report a new fabrication method for a fully stretchable supercapacitor based on single wall carbon nanotube (SWCNT)-coated electrospun rubber nanofibers as stretchable supercapacitor electrodes. The deposition conditions of SWCNT on hydrophobic rubber nanofibers are experimentally optimized to induce a uniform coating of SWCNT. For surfactant-assisted coating of SWCNT, both water contact angle and sheet resistance were lower compared to the cases with other surface treatment methods, indicating a more effective coating approach. The excellent electromechanical properties of this electrode under stretching conditions are demonstrated by the measurement of Young’s modulus and normalized sheet resistance. The superb tolerance of the electrode with respect to stretching is the result of (i) high aspect ratios of both nanofiber templates and the SWCNT conductors, (ii) the highly elastic nature of rubbery nanofibers, and (iii) the strong adherence of SWCNT-coated nanofibers on the elastic ecoflex substrate. Electrochemical and electromechanical measurements on stretchable supercapacitor devices reveal that the volumetric capacitance (15.2 F cm−3 at 0.021 A cm−3) of the unstretched state is maintained for strains of up to 40%. At this level of strain, the capacitance after 1,000 charge/discharge cycles was not significantly reduced. The high stability of our stretchable device suggests potential future applications in various types of wearable energy storage devices. View Full-Text
Keywords: supercapacitors; stretchable; SBS nanofiber; carbon nanotube; electrospinning supercapacitors; stretchable; SBS nanofiber; carbon nanotube; electrospinning
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MDPI and ACS Style

Yoon, J.; Lee, J.; Hur, J. Stretchable Supercapacitors Based on Carbon Nanotubes-Deposited Rubber Polymer Nanofibers Electrodes with High Tolerance against Strain. Nanomaterials 2018, 8, 541.

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