Fig. 3: Electrochemical studies toward Li–S batteries.

a CV curves at a scan rate of 0.1 mV s−1 between 1.7 and 2.8 V. b Galvanostatic charge–discharge profiles at 0.2 C. c Rate performance. d Comparison of the rate performance of the S@rGO/a-CoO NSs electrode in this work and other metal oxides-based electrodes recently reported. e Cycling performance at 1 C of the S@rGO/a-CoO NSs electrode.