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Structural characterizations of NiS2/Ni3C@C. A) SEM, TEM and B–D) high‐resolution transmission electron microscopy (HRTEM) images of NiS2/Ni3C@C. F) XRD pattern of NiS2/Ni3C@C. G–H) X‐ray photoelectron spectroscopy (XPS) spectra of C 1s and Ni 2p.
