4.3 Article Proceedings Paper

Effects of microwave and oxygen plasma treatments on capacitive characteristics of supercapacitor based on multiwalled carbon nanotubes

Journal

JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 55, Issue 2, Pages -

Publisher

IOP PUBLISHING LTD
DOI: 10.7567/JJAP.55.02BD05

Keywords

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Funding

  1. KMITL Research Fund [KREF045508]
  2. National Nanotechnology Center (NANOTEC)
  3. NSTDA
  4. Ministry of Science and Technology, Thailand, through its program of the Center of Excellence Network
  5. Thailand Center of Excellence in Physics (ThEP)
  6. Office of the Higher Education Commission (OHEC)

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The effects of microwave and oxygen plasma treatments on the capacitive characteristics of a supercapacitor based on multiwalled carbon nanotubes (MWNTs) were investigated. MWNTs were heat-treated under air ambient at 500 degrees C for 1 h, and subsequently microwave-treated at 650W for 70 s (m-MWNTs). Another batch of MWNTs was treated by oxygen plasma for 30 min (p-MWNTs). Pristine MWNTs, m-MWNTs, and p-MWNTs were separately used as electrode materials for supercapacitors. Their cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy results were analyzed. The p-MWNTs show the best performance with a specific capacitance of 238.23 F.g(-1). The capacitance improvement is attributed to the increase in the number of oxygen-containing functional groups, as evidenced by Fourier transform-infrared spectroscopy and contact angle measurement. These results suggest that oxygen plasma treatment is a rapid and efficient method for oxygen functionalization. (C) 2016 The Japan Society of Applied Physics

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