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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 54, Number 1
JKCSEZ 54(1)
February 20, 2010 

Surface Treatment of Multi-walled Carbon Nanotubes for Increasing Electric Double-layer Capacitance

다중벽 탄소나노튜브의 표면처리에 따른 전기이중층 커패시터의 특성
Ji Il Kim, Ick Jun Kim, Soo Jin Park*

김지일, 김익준, 박수진*
전기이중층 커패시터, 다중벽 탄소나노튜브, 질소관능기, 전기화학적 특성 , Electric double-layer capacitors, Multi-walled carbon nanotubes, Nitrogen, Electrochemical properties
본 연구에서는 Urea와 산 처리로 질소 및 산소 관능기가 도입된 다중벽 탄소나노튜브를 각각 제조하였으며, 표면처리에 따른 전기이중층 커패시터 (EDLCs) 특성을 관찰하였다. XPS, zeta-potential, 및 BET 분석방법을 이용하여 구조특성을 확인하였으며, 전기화학적 특성은 1 M 황산용액의 전해질에서 각각 50 mVs-1과 100 mVs-1의 주사속도로 순환전류 전압곡선 특성 실험을 통해 고찰하였다. 실험 결과로부터 MWNTs의 질소 원소구성비가 늘어날수록 축전용량이 증가하는 것을 확인하였으며, Urea 처리된 MWNTs의 축전용량이 가장 높은 수치를 나타내었다. 이는 전극 표면과 전하 활성종 간의 젖음성이 증가 하고, 표면 관능기의 밀도가 증가하기 때문인 것으로 사료된다.

In this work, the electrochemical properties of surface treated multi-walled carbon nanotubes (MWNTs) were studied. Nitrogen and oxygen functional groups of the MWNTs were introduced by urea and acidic treatment, respectively. The surface functional groups of the MWNTs were confirmed by X-ray photoelectron spectroscopy (XPS) measurements and zeta-potential method. The characteristics of N2 adsorption isotherm at 77 K, specific surface area, and total pore volumes were investigated by BET eqaution, BJH method and t-plot method. Electrochemical properties of the functionalized MWNTs were accumulated by cyclic voltammetry at the scan rates of 50 mVs-1 and 100 mVs-1 in 1 M H2SO4 as electrolytes. As a result, the functionalized MWNTs led to an increase of capacitance as compared with pristine MWNTs. It was found that the increase of capacitance for urea treated MWNTs was attributed to the increase in density of surface functional groups, resulting in improving the wettability between electrode materials and charge species.

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