Carbon Nanotubes (CNTs) were activated by CO2 and air under different durations, then were used in polarizable electrodes of electric double-layer capacitors (EDLCs).
The interelectrode dielectric adopts the polypropylene film with surface coarsening which is easy to impregnate so as to enhance the reliability of high-capacity capacitor.
For electrical properties of MOS capacitors, the C-V curves were obtained by LCR meter (HP4284A), and picoampere meter (HP4140B) was used to measure the J-V curves.