Fig. 2. The cyclic voltammetry of different CNT samples a at the scan rate of 0.01 V/s in 2 M Na2SO4 electrolyte, b at the scan rate of 0.05 V/s in 2 M KOH electrolyte and c at the scan rate of 0.05 V/s in 2 M KOH and Na2SO4 electrolyte.
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