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Impedance analysis was employed to study the frequency response characteristics of supercapacitors utilizing single-walled carbon nanotubes (SWNTs) as electrode material. The knee frequency is around 631Hz for the electrochemically oxidized SWNT supercapacitor, much higher than that of the as-prepared one (around 316Hz) and the common activated carbon supercapacitor (1Hz). The good frequency response observed in this work is due to the introduction of nanosized mesopores and oxygen-containing groups formed during the electrochemical oxidization of SWNTs. The capacitance of electrochemically oxidized SWNT supercapacitor is 113F∕g, which is much higher than the value of the as-prepared one (20F∕g).
Liu et al. (Mon,) studied this question.