Fig. 9.

Electrochemical performance of S-CMS-3. a CV curves of S-CMS-3 at different scan rates; b charge-discharge curves of S-CMS-3 at different current densities; c specific capacitance of S-CMS-3 at different current densities; d energy and power density of S-CMS-3; e Nyquist plot of S-CMS-3; and f capacity retention and coulombic efficiency of S-CMS-3 electrode after 3000 cycles