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Cyclic voltammograms for the first five cycles of Fe2O3-NC/GN electrode; (b) charge-discharge voltage profiles of Fe2O3-NC/GN electrode at a current density of 500 mA g−1; (c) Cycle performance of Fe2O3-NC/GN electrode at a current density of 500 mA g−1; (d) Rate capability of Fe2O3-NC/GN and pure Fe2O3 at different current densities.
