Figure 6

(a) The CV curves of SnO₂@C@half-rGO//gpC LIHC in different voltage windows of 0–3.0 V, 0–3.5 V, 0–3.8 V and 0–4.0 V at 50 mV s⁻¹. The CV curves of (b) SnO₂@C@half-rGO//gpC and (c) SnO₂@C/rGO//gpC LIHC at different scan rates of 2, 5, 10, 20, 50 mV s⁻¹ in the voltage windows of 0–4.0 V. Galvanostatic charge-discharge curves of (d) SnO₂@C@half-rGO//gpC and (e) SnO₂@C/rGO//gpC LIHC at different current densities of 0.1, 0.2, 0.5, 1.0, 2.0, 5.0, and 10.0 A g⁻¹. (f) Specific capacitance values of SnO₂@C@half-rGO//gpC (red) and SnO₂@C/rGO//gpC (blue) LIHC calculated from the result shown in (d,e).