Carbon nanotube 3D current collectors for lightweight, high performance and low cost supercapacitor electrodes

Ricardo Quintero, Dong Young Kim, Kei Hasegawa, Yuki Yamada, Atsuo Yamada, Suguru Noda

Research output: Contribution to journalArticle

20 Citations (Scopus)


Self-supporting hybrid electrodes were fabricated through the systematic combination of activated carbon (AC), a low cost capacitive material, with sub-millimetre long few-wall carbon nanotubes (FWCNTs). After an easy three-step (mixing, dispersion and filtration) process, robust self-supporting films were obtained, comprising 90% AC particles wrapped in a 3-dimensional FWCNT collector. The 10% FWCNTs provide electrical conductivity and mechanical strength, and replace heavier metal collectors. The FWCNT matrix effectively improved the capacitance of the inexpensive, high surface area AC to 169 F g-1 at a slow scan rate of 5 mV s-1, and to 131 F g -1 at a fast scan rate of 100 mV s-1, in fairly thick (∼200 μm) electrodes. Connection to a metallic collector at the film edge only, which significantly reduced the use of metal, retained much larger capacitance for the AC-FWCNT hybrid film (107 F g-1) than for the conventional AC electrode with binder and conductive filler (3.9 F g -1) at a practical voltage scan rate, 100 mV s-1. Transport measurements in three- and two-electrode cells show that the FWCNT matrix can greatly enhance the conductivity of the AC-based films.

Original languageEnglish
Pages (from-to)8230-8237
Number of pages8
JournalRSC Advances
Issue number16
Publication statusPublished - 2014 Feb 4


ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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