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나노입자 연구단
나노입자 연구단
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High-performance supercapacitors based on defect-engineered carbon nanotubes

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Title
High-performance supercapacitors based on defect-engineered carbon nanotubes
Author(s)
Yun, YS; Gabin Yoon; Kisuk Kang; Jin, HJ
Publication Date
2014-12
Journal
CARBON, v.80, no., pp.246 - 254
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
Defect-engineered carbon nanotubes (CNTs) were prepared by KOH activation and subsequent nitrogen doping. Controlled KOH activation of the CNTs enlarged the specific surface area to 988m2 g1, which is about 4.5 times greater than that of pristine CNTs. In addition, a hierarchical pore structure and a rough surface developed at high degrees of activation, which are advantageous features for fast ion diffusion. The subsequent nitrogen doping changed the band structure of the CNTs, resulting in improved electrical properties. Symmetric supercapacitors fabricated using these nitrogen-doped and activated CNTs (NACNTs) successfully worked across a wide potential range (0–3.5 V) and exhibited a high capacitance of 98 F g1 at a current density of 1 A g1. Furthermore, a low equivalent series resistance (2.2 X) was achieved owing to the tailored nanostructure and electrical properties of the electrode materials. Over the voltage range from 0 to 3.5 V, supercapacitors based on NA-CNTs exhibited a high specific energy of 59 Wh kg1 and a specific power of 1750Wkg1. In addition, a specific power of 52,500Wkg1 with a 3-s charge/discharge rate was achieved with a specific energy of 26 Wh kg1. Moreover, the supercapacitors showed stable performance over 10,000 charge/discharge cycles.
URI
https://pr.ibs.re.kr/handle/8788114/844
ISSN
0008-6223
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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