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(a) Cyclic voltammetry of Fe2O3@MWCNTs between 3 and 0 V at a scan rate of 0.1 mVs−1, (b) Galvanostatic discharge/charge voltage profiles of Fe2O3@MWCNTs at a current density of 100 mAg−1, (c) Discharge capacities versus cycle number of Fe2O3@MWCNTs, MWCNTs, the composite and commercial Fe2O3 at the current density of 100 mAg−1 between 3 and 0 V, (d) Discharge and charge capacity of Fe2O3@MWCNTs at different current densities between 3 and 0 V.
