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Issue 16, 2014
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Carbon nanotube 3D current collectors for lightweight, high performance and low cost supercapacitor electrodes

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Abstract

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.

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

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Publication details

The article was received on 11 Dec 2013, accepted on 06 Jan 2014 and first published on 07 Jan 2014


Article type: Paper
DOI: 10.1039/C3RA47517D
Citation: RSC Adv., 2014,4, 8230-8237
  • Open access: Creative Commons BY-NC license
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    Carbon nanotube 3D current collectors for lightweight, high performance and low cost supercapacitor electrodes

    R. Quintero, D. Y. Kim, K. Hasegawa, Y. Yamada, A. Yamada and S. Noda, RSC Adv., 2014, 4, 8230
    DOI: 10.1039/C3RA47517D

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