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The electrochemical performance of the Ni3S2@C/RGO electrodes. (a) Cyclic voltammograms of the Ni3S2@C/RGO composite at a scan rate of 0.2 mV·s−1; (b) Charge-discharge voltage profiles of the Ni3S2@C/RGO materials at a current density of 200 mA·g−1; (c) Charge-discharge cycling of these electrodes; (d) Rate performance of the Ni3S2@C/RGO electrode at different current densities from100 to 5000 mA·g−1.
