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. 2016 Mar 21;6:23338. doi: 10.1038/srep23338

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(a) Nyquist impedance plots of the nanofibers before cycling, (b) Nyquist impedance plots of bare NiSe₂ nanofibers after cycling, (c) Nyquist impedance plots of NiSe₂-rGO-C composite nanofibers after cycling, and (d) equivalent circuit model used for AC impedance fitting.