Ionic liquid coated single-walled carbon nanotube buckypaper as supercapacitor electrode--颗粒学报PARTICUOLOGY

Zheng, C., Qian, W., Yu, Y., & Wei, F. (2013). Ionic liquid coated single-walled carbon nanotube buckypaper as supercapacitor electrode. Particuology, 11(4), 409–414. https://doi.org/10.1016/j.partic.2012.07.013

Ionic liquid coated single-walled carbon nanotube buckypaper as supercapacitor electrode

Chao Zheng, Weizhong Qian^*, Yuntao Yu, Fei Wei

Beijing Key Laboratory of Green Reaction Engineering & Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

10.1016/j.partic.2012.07.013

Volume 11, Issue 4, August 2013, Pages 409-414

Received 29 April 2012, Revised 25 June 2012, Accepted 13 July 2012, Available online 11 April 2013.

E-mail: qianwz@tsinghua.edu.cn; qianwz@mail.tsinghua.edu.cn

Highlights

• Single walled carbon nanotubes (SWCNTs) were debundled by ionic liquids.

• ILs-coated SWCNT buckypaper had low surface resistance and high packing density.

• ILs-coated SWCNT buckypaper used as electrode exhibited excellent capacitance performance.

Abstract

Effect of stacking structure of single-walled carbon nanotubes (SWCNTs) on its performance as electrode of supercapacitor was investigated in the present work. Considering SWCNTs easily formed bundles due to strong van de Waals attraction between tubes, we proposed first dispersion of SWCNTs by ionic liquids (ILs) of 1-ethyl-3-methyl imidazolium tetrafluoroborate (EMIMBF₄), followed by fabrication of buckypaper by compression. The debundling effect of ILs on SWCNTs increased the interface between electrode and electrolyte, decreased electrical resistance, and, consequently, increased performance of the supercapacitor. Since ILs, used to disperse SWCNTs, also functioned as electrolyte in supercapacitor, our method is a simple way to prepare buckypaper electrode with high performance.

Graphical abstract

Keywords

Carbon nanotubes; Buckypaper; Supercapacitor; Ionic liquids

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