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HR‐TEM and corresponding interfaces and defects in MCo2O4 composites. a–a3) NiCo2O4‐NiO, b) Raman spectra of Fe, Ni, Cu, and Zn ions as reactants, c) EM wave absorption mechanism, d) Mg‐Co3O4, e) Mn‐Co3O4, f–f3) FeCo2O4‐Co3O4, g) CuCo2O4‐CuO, h) ZnCo2O4‐ZnO, i,j) EIS, and k) ESR curves of serial Co‐based spinel samples.
