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Electrochemical performance of the SiO2-rGO@PPy; (a) cyclic voltammograms recorded at a scan rate of 0.1 mV s−1 and (b) the first three charge–discharge profiles at a current density of 0.1 A g−1. (c) Comparing the rate capability of bare PPy (blue), SiO2-rGO (black), and SiO2-rGO@PPy (green) at different current densities ranging from 0.1 to 2 A g−1. (d) Long-term cycling performances and Coulombic efficiency at a current density of 100 mA g−1.
