| Summary: | Carbon nanotube (CNT)-based electrochemical capacitor (EC) has been actively studied as a high-power density energy storage for the portable product and energy sustainable development. The present work reports the deposit yields and graphitic concentration of CNT deposited by pulsed electrophoretic deposition (EPD) for the use as EC’s active electrode materials. Using a conventional EPD apparatus, the pulsed EPD was conducted at pulse separation times (pause widths) of 30 to 50 s, alternated with the pulse width of 2.5 min. SEM micrograph showed the pulsed EPD at the pulse separation time of 30 s reduced the deposited CNT coating’s density. An increase of the graphitic concentration by 40% as compared to the CNT coating deposited by continuous
EPD was indicated by the IG/ID ratio of the Raman spectra results. The enrichment of graphitic phase in the EC drastically enlarged the specific capacitance of the EC by 150% as compared to the continuous EPD’s EC result. The finding opens up the possibility of EC performance enhancement by controlling the graphitic CNT concentration of the electrode materials using
pulse EPD process.
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