High performance electrochemical capacitors from aligned carbon nanotube electrodes and ionic liquid electrolytes

Extracting the Full Potential of Single‐Walled Carbon Nanotubes as Durable Supercapacitor Electrodes Operable at 4 V with High Power and Energy Density

“…The combination of the energy density and maximum power density rating of the SWNT electrodes (94 Wh kg − 1 , 47 Wh L − 1 ; 210 kW kg − 1 , 105 kW L − 1 ) surpasses most other CNT electrodes reported. Recently lowdensity plasma-treated multiwalled CNTs used as electrodes with an ionic liquid electrolyte [ 29 ] have shown high performance at 4 V; however, the charge/discharge cycles were limited to the range from 2 V to 4 V and no lifetime performance has been reported yet.…”

Carbon Nanotube Supercapacitors

“…Also, a high capacitance has been obtained in 1 M H 2 SO 4 for an aligned CNT array electrode (365 F/g) prepared by chemical vapor deposition in the template of porous anodic aluminum oxide (Chen et al, 2004) and in ionic liquid electrolytes for an aligned CNT electrode (440 F/g) prepared by a template-free chemical vapor deposition approach (Lu et al, 2009). In addition to the pure tube electrodes as discussed above, CNTs have also been employed to fabricate electrodes in nanocomposite forms (e.g., with activated carbons, electroactive polymers, or metal oxides) to improve the performance for supercapacitors.…”

“…Soc.)). Our recent work investigated the electrochemical behavior of plasma-etched, vertically aligned CNTs (Fig.12) in ionic liquid electrolytes (Lu et al, 2007;Lu et al, 2009). In ionic liquid 1-ethyl-3-methyl imidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][Tf 2 N]), the aligned CNT electrode showed a butterfly-shape cyclic voltammogram (CV) (Fig.13.…”

Recent Progress on Electrochemical Capacitors Based on Carbon Nanotubes

“…Moreover, room-temperature ionic liquids with an operating voltage as high as 4 V could also be used as electrolyte systems. However, supercapacitors based on ionic liquids have poor device power performance due to their low ionic conductivity, i.e., below 20 mS cm À1 [23,30,33].…”