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Nanomaterials 2018, 8(7), 464; https://doi.org/10.3390/nano8070464

Cutting-Processed Single-Wall Carbon Nanotubes with Additional Edge Sites for Supercapacitor Electrodes

1
School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea
2
Department of Materials Science & Engineering, Kangwon National University, Chuncheon 24341, Korea
3
Semiconductor R&D Center, Samsung Electronics, Hwaseong 18448, Korea
4
Department of Rural and Biosystems Engineering, Chonnam National University, Gwangju 61186, Korea
5
Department of Mechanical Engineering, Yonsei University, Seoul 03722, Korea
*
Authors to whom correspondence should be addressed.
Received: 12 June 2018 / Revised: 23 June 2018 / Accepted: 23 June 2018 / Published: 26 June 2018
(This article belongs to the Special Issue Nanomaterials for Renewable and Sustainable Energy)
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Abstract

Carbon nanotubes are frequently selected for supercapacitors because of their major intrinsic properties of mechanical and chemical stability, in addition to their excellent electrical conductivity. However, electrodes using carbon nanotubes suffer from severe performance degradation by the phenomenon of re-stacking during fabrication, which hinders ion accessibility. In this study, short single-wall carbon nanotubes were further shortened by sonication-induced cutting to increase the proportion of edge sites. This longitudinally short structure preferentially exposes the active edge sites, leading to high capacitance during operation. Supercapacitors assembled using the shorter-cut nanotubes exhibit a 7-fold higher capacitance than those with pristine single-wall nanotubes while preserving other intrinsic properties of carbon nanotubes, including excellent cycle performance and rate capability. The unique structure suggests a design approach for achieving a high specific capacitance with those low-dimensional carbon materials that suffer from re-stacking during device fabrication. View Full-Text
Keywords: carbon nanotube; supercapacitor; functionalized CNT; energy storage carbon nanotube; supercapacitor; functionalized CNT; energy storage
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kim, T.; Kim, M.K.; Park, Y.; Kim, E.; Kim, J.; Ryu, W.; Jeong, H.M.; Kim, K. Cutting-Processed Single-Wall Carbon Nanotubes with Additional Edge Sites for Supercapacitor Electrodes. Nanomaterials 2018, 8, 464.

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