Fig. 4. (a) Cyclic voltammetry of SiO2 nanowire arrays between 3 and 0 V at a scan rate of 0.1 mV s−1. (b) The charge–discharge profiles for different cycles. (c) Cycling performance and coulombic efficiency of SiO2 nanowire arrays electrode under 200 mA g−1 within a voltage of 0.05–3.0 V. (d) Rate performance of SiO2 nanowire arrays electrode.
