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

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(a) Charge/discharge profiles of the micro-FeS electrode for the first cycle at 50 mA g⁻¹; (b) the corresponding ex-situ XRD patterns with the standard XRD patterns of Na₂S and Na₂CO₃ (inset), and (c) the respective ex-situ Fe 2p XPS spectra of the micro-FeS electrode at the denoted states.