Radio frequency oxygen–plasma treatment of carbon nanotube electrodes for electrochemical capacitors

✍ Scribed by Chuen-Chang Lin; Hsien-Chieh Huang

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 837 KB
• Volume: 188
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2008.11.100

✦ Synopsis

Carbon nanotubes were modified by RF (radio frequency) oxygen-plasma at different power levels and times, and subsequently annealed at different temperatures. At the 1000th cycle of potential cycling, maximum specific capacitance of 128 F g -1 was obtained in 0.1 M H 2 SO 4 and with better plasma treatment conditions (power = 100 W and time = 30 min) and annealing temperature (350 • C). These show its high electrochemical stability and good specific capacitance at a higher sweep rate of 100 mV s -1 . In addition, the higher the power and time, the higher the carbonyl functional group (C O), leading to higher specific capacitance.