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. 2015 Oct 28;6:8689. doi: 10.1038/ncomms9689

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Cyclic voltammograms of (a) the micro-FeS and (b) yolk-shell FeS@C nanospheres at the scan rate of 0.5 mV s⁻¹; (c) cycling performances at 0.2 C (100 mA g⁻¹); and (d) rate capability at various current rates of the micro-FeS, core-shell FeS/C nanospheres and yolk-shell FeS@C nanospheres.