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XRD patterns and XPS spectra of synthesized materials: (a) XRD patterns of human HHC, (b) XRD patterns of C–Ag/NiO x @Mn y O z composite materials at different conditions, (c) XPS wide scan, (d) Mn 2p XPS spectra of C–Ag/NiO x @Mn y O z @800 °C, (e) Ni 2p XPS spectra of C–Ag/NiO x @Mn y O z @800 °C, (f) Ag 3d XPS spectra of C–Ag/NiO x @Mn y O z @800 °C, (g) C 1s XPS spectra of C–Ag/NiO x @Mn y O z @800 °C, and (h) O 1s XPS spectra of C–Ag/NiO x @Mn y O z @800 °C.
