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.
Bibliographical noteFunding Information:
Acknowledgments: This research was supported by the Basic Science Research Program through the Acknowledgments: This research was supported by the Basic Science Research Program through the National (NRF-2018R1C1B6004358) and (NRF-2017R1C1B2011750). Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF- Conflicts of Interest: The authors declare no conflict of interest.
This research was supported by the Basic Science Research Program through theNational Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2018R1C1B6004358) and (NRF-2017R1C1B2011750).
© 2018 by the authors. Licensee MDPI, Basel, Switzerland.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Materials Science(all)