Fig. 8.

Electrochemical performance of CMS. a CV curves of CMS with different contents of KOH at 100 mV s⁻¹; b CV curves of CMS-3 at different scan rates; c charge-discharge curves of CMS with different contents of KOH at 1 A g⁻¹; d charge-discharge curves of CMS-3 at different current densities; e Nyquist plot of CMS-3; and f capacity retention and coulombic efficiency of CMS-3 electrode after 10,000 cycles