Structural and electrochemical characterization of ethylenediaminated Single-walled carbon Nanotubes Prepared from Fluorinated SWCNTs

Kohei Bushimata, Shin Ichi Ogino, Kazutaka Hirano, Tatsuhiro Yabune, Kenta Sato, Takashi Itoh, Kenichi Motomiya, Koji Yokoyama, Daiki Mabuchi, Hikaru Nishizaka, Go Yamamoto, Toshiyuki Hashida, Kazuyuki Tohji, Yoshinori Sato

研究成果: Article

13 被引用数 (Scopus)

抄録

We prepared ethylenediaminated single-walled carbon nanotubes (SWCNTs) from fluorinated SWCNTs by substituting fluorine groups with ethylenediamine groups. The ethylenediaminated SWCNTs were characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), Raman scattering spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller surface area measurement by nitrogen adsorption, contact angle measurement, zeta potential analysis, and thermogravimetry. In addition, the properties of 30 wt % sulfuric acid aqueous electrolyte-based electric double-layer supercapacitors (EDLSCs) with free-standing ethylenediaminated SWCNT electrodes were investigated. The degree of ethylenediamine functionalization was 0.603 mmol/g and 1.46 μmol/m 2, and the specific surface area was ∼413.3 m2/g. From HRTEM observation, isolated nanotubes disentangled from the bundled SWCNTs were present in many observed areas, and the structures retained a nanotube skeleton. The properties of the EDLSCs with the ethylenediaminated SWCNT electrodes included an average specific capacitance of 94 F/g at a low scan rate of 10 mV/s and an energy density of 2.6 Wh/kg at a power density of 0.24 kW/kg. The EDLSCs exhibited an average specific capacitance of 67 F/g at a high scan rate of 1000 mV/s and an energy density of 1.3 Wh/kg at a power density of 24 kW/kg, values that were superior to those of carboxylated SWCNT electrodes.

本文言語English
ページ(範囲)14948-14956
ページ数9
ジャーナルJournal of Physical Chemistry C
118
27
DOI
出版ステータスPublished - 2014 7 10

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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