Thermal-Treatment-Induced Enhancement in Effective Surface Area of Single-Walled Carbon Nanohorns for Supercapacitor Application

Authors
Jung, Hwan JungKim, Yong-JungHan, Jong HunYudasaka, MasakoIijima, SumioKanoh, HirofumiKim, Yoong AhmKaneko, KatsumiYang, Cheol-Min
Issue Date
2013-12-12
Publisher
American Chemical Society
Citation
The Journal of Physical Chemistry C, v.117, no.49, pp.25877 - 25883
Abstract
We investigated the importance of the specific effective surface area through a detailed study on the relationship between electrical conductivity of single-walled carbon nanohorns (SWCNHs) and accessibility of the electrolyte ions in the SWCNH-based supercapacitor. After heat treatment of the SWCNHs, the ratio of sp(2)/sp(3) carbons dramatically increased, suggesting an enhanced electrical conductivity of the SWCNHs. Even though the specific surface area (SSA) slightly decreased by 16% as a result of heat treatment, the specific capacitance per SSA of the SWCNH electrode remarkably increased from 22 to 47 mu F cm(-2). Such a result indicates an explicit increase in accessible effective surface area by electrolyte ions. Our result clearly showed that a higher degree of utilization for the interstitial pore of SWCNHs by solvated ions is a key factor in achieving a high volumetric capacitance of SWCNH-based supercapacitors.
Keywords
CAPACITANCE; PORE; ADSORPTION; SIMULATION; NANOTUBES; ELECTRODE; SIZE; CAPACITANCE; PORE; ADSORPTION; SIMULATION; NANOTUBES; ELECTRODE; SIZE; Single-Walled Carbon Nanohorn; Supercapacitor
ISSN
1932-7447
URI
https://pubs.kist.re.kr/handle/201004/127336
DOI
10.1021/jp405839z
Appears in Collections:
KIST Article > 2013
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