Studies on Surface Functionalized Single Wall Carbon Nanotube for Electrochemical Double Layer Capacitor Application
Studies on Surface Functionalized Single Wall Carbon Nanotube for Electrochemical Double Layer Capacitor Application
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DOI：
10.1166/jnn.2010.1995
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发表时间：
2010-06-01
影响因子：
--
通讯作者：
Kawasaki, S.
中科院分区：
文献类型：
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作者：
Mukhopadhyay, I.;Suzuki, Y.;Kawasaki, S.
单壁碳纳米管（SWCNTs）的表面功能化是通过化学氧化和电化学氧化在水介质中进行的。在酸性混合物中处理swcnts，表面氧化，主要为微孔结构，在1 M H2SO4溶液中，电流为50 mAg(-1)，赝电容为209 Fg（-1）。当用发烟HNO3处理时，即使在含氧物质存在的情况下，swcnts表面也变得轻微非极性。在50 mAg（-1）的电流速率下，由于存在介孔，在聚碳酸酯中的1 M Et3MeNBF4中观察到202 Fg（-1）的最大电容。在KNO2的电化学氧化作用下，NO在SWCNTs表面表现出中间赝电容，可能只促进较小离子沿SWCNTs介孔壁上的组织。混合酸处理的SWCNTs即使在5000 mAg（-1）的高电流下也表现出160 Fg（-1）的明显大电容。
Surface functionalization of single wall carbon nanotubes (SWCNTs) is carried out by chemical and electrochemical oxidation in aqueous medium. Treatment of SWCNT in acid mixtures results oxygenated surface with mainly micro porous texture which shows a pseudocapacitance of 209 Fg(-1) in 1 M H2SO4 solution at a current rate of 50 mAg(-1). The SWCNT surface become slightly non-polar when treated with fuming HNO3 even in the presence of oxygenated species. Under a current rate of 50 mAg(-1), a maximum capacitance of 202 Fg(-1) is observed in 1 M Et3MeNBF4 in polycarbonate due to presence of mesopores. Electrochemical oxidation in KNO2 functionalizes the SWCNT surface with NO, species which shows intermediate pseudocapacitance facilitating probably organization of only smaller ions along the walls of mesopores of SWCNT The mixed acid treated SWCNTs exhibit sensibly larger capacitance of 160 Fg(-1) even at higher current rate of 5000 mAg(-1).