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(a) XPS survey scan spectrum of Ti3C2-MXene/NiO and high-resolution XPS spectra of elements (b) Ti2p, (c) C1s, (d) Ni2p, (e) O1s, (f) Cs3d, (g) Pb4f, and (h) I3d states for Ti3C2-MXene/NiO. (Black line; fitting and violet line; background).
