Highly dispersible surface-unzipped multi-walled carbon nanotubes as binder-free electrodes for supercapacitor applications

Hee Chang Youn, Sang Hoon Park, Kwang Chul Roh, Kwang Bum Kim

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Abstract In this study, highly dispersible unzipped multi-walled carbon nanotubes were successfully synthesized by chemical etching, and these nanotubes were used in the fabrication of binder-free electrodes by electrostatic spray deposition for supercapacitor applications. The chemical etching introduces oxygen-containing functional groups and the unzipping or exfoliation process of the multi-walled carbon nanotube sidewalls produces a form of graphene sheets, making them highly dispersible in a polar solvent and providing rich electrochemically active sites accessible to electrolyte ions under electrode state. The binder-free unzipped multi-walled carbon nanotube electrode delivered a specific capacitance as high as 133 F/g at a scan rate of 10 mV/s in a 1 M H2SO4 aqueous electrolyte. When the scan rate was increased to 500 mV/s, the specific capacitance of this binder-free electrode decreased slightly to 103 F/g, which is a 77% retention of the initial value at 10 mV/s. This highlights the competitive rate capability of this carbon-based electrode.

Original languageEnglish
Article number3873
Pages (from-to)S21-S26
JournalCurrent Applied Physics
Volume15
Issue numberS1
DOIs
Publication statusPublished - 2015 Aug 3

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Carbon Nanotubes
electrochemical capacitors
Binders
Carbon nanotubes
carbon nanotubes
Electrodes
electrodes
Electrolytes
Etching
Capacitance
capacitance
etching
electrolytes
Graphite
Graphene
Nanotubes
Functional groups
sprayers
Electrostatics
nanotubes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

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title = "Highly dispersible surface-unzipped multi-walled carbon nanotubes as binder-free electrodes for supercapacitor applications",
abstract = "Abstract In this study, highly dispersible unzipped multi-walled carbon nanotubes were successfully synthesized by chemical etching, and these nanotubes were used in the fabrication of binder-free electrodes by electrostatic spray deposition for supercapacitor applications. The chemical etching introduces oxygen-containing functional groups and the unzipping or exfoliation process of the multi-walled carbon nanotube sidewalls produces a form of graphene sheets, making them highly dispersible in a polar solvent and providing rich electrochemically active sites accessible to electrolyte ions under electrode state. The binder-free unzipped multi-walled carbon nanotube electrode delivered a specific capacitance as high as 133 F/g at a scan rate of 10 mV/s in a 1 M H2SO4 aqueous electrolyte. When the scan rate was increased to 500 mV/s, the specific capacitance of this binder-free electrode decreased slightly to 103 F/g, which is a 77{\%} retention of the initial value at 10 mV/s. This highlights the competitive rate capability of this carbon-based electrode.",
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Highly dispersible surface-unzipped multi-walled carbon nanotubes as binder-free electrodes for supercapacitor applications. / Youn, Hee Chang; Park, Sang Hoon; Roh, Kwang Chul; Kim, Kwang Bum.

In: Current Applied Physics, Vol. 15, No. S1, 3873, 03.08.2015, p. S21-S26.

Research output: Contribution to journalArticle

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AU - Park, Sang Hoon

AU - Roh, Kwang Chul

AU - Kim, Kwang Bum

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N2 - Abstract In this study, highly dispersible unzipped multi-walled carbon nanotubes were successfully synthesized by chemical etching, and these nanotubes were used in the fabrication of binder-free electrodes by electrostatic spray deposition for supercapacitor applications. The chemical etching introduces oxygen-containing functional groups and the unzipping or exfoliation process of the multi-walled carbon nanotube sidewalls produces a form of graphene sheets, making them highly dispersible in a polar solvent and providing rich electrochemically active sites accessible to electrolyte ions under electrode state. The binder-free unzipped multi-walled carbon nanotube electrode delivered a specific capacitance as high as 133 F/g at a scan rate of 10 mV/s in a 1 M H2SO4 aqueous electrolyte. When the scan rate was increased to 500 mV/s, the specific capacitance of this binder-free electrode decreased slightly to 103 F/g, which is a 77% retention of the initial value at 10 mV/s. This highlights the competitive rate capability of this carbon-based electrode.

AB - Abstract In this study, highly dispersible unzipped multi-walled carbon nanotubes were successfully synthesized by chemical etching, and these nanotubes were used in the fabrication of binder-free electrodes by electrostatic spray deposition for supercapacitor applications. The chemical etching introduces oxygen-containing functional groups and the unzipping or exfoliation process of the multi-walled carbon nanotube sidewalls produces a form of graphene sheets, making them highly dispersible in a polar solvent and providing rich electrochemically active sites accessible to electrolyte ions under electrode state. The binder-free unzipped multi-walled carbon nanotube electrode delivered a specific capacitance as high as 133 F/g at a scan rate of 10 mV/s in a 1 M H2SO4 aqueous electrolyte. When the scan rate was increased to 500 mV/s, the specific capacitance of this binder-free electrode decreased slightly to 103 F/g, which is a 77% retention of the initial value at 10 mV/s. This highlights the competitive rate capability of this carbon-based electrode.

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