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Analysis of the Electrochemical Oxidation of Multiwalled Carbon Nanotube Tower Electrodes in Sodium Hydroxide |
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| Authors: | Amos Doepke Changseok Han Tyson Back Wondong Cho Dionysios D Dionysiou Vesselin Shanov H Brian Halsall William R Heineman |
| Institution: | 1. Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221‐0172, USA;2. School of Energy, Environmental, Biological, and Medical Engineering, University of Cincinnati, Cincinnati, Ohio 45221‐0012, USA;3. Air Force Research Laboratory, Materials and Manufacturing Directorate, Electronic and Optical Materials Branch (AFRL/RXPS), Wright‐Patterson AFB, OH 45433‐7077, USA;4. Universal Technology Corporation, 1270 N. Fairfield Rd, Dayton, OH 45432, USA |
| Abstract: | Towers of aligned multiwalled carbon nanotubes (MWCNTs) were electrochemically oxidized in aqueous 1 M NaOH. An oxidation current that decayed with time was monitored using amperometry at a fixed potential. Cyclic voltammetry showed that the background current and electrode capacitance increased after oxidation without significantly affecting the faradaic current from the reduction of ferricyanide. Oxidation in NaOH caused morphological changes and increased hydrophilicity of the MWCNT tower electrodes. XPS spectra indicated increased oxygen on the surface after oxidation, while Raman spectra indicated that a large amount of amorphous carbon was present before and after oxidation. |
| Keywords: | CNT Nanotubes Electrochemical oxidation Sodium hydroxide |