Preparation of Improved p-n Junction NiO/TiO₂ Nanotubes for Solar-Energy-Driven Light Photocatalysis

Figure 6

XPS spectra of NiO/TNTs (0.5 M) (a) fully scanned spectra, (b) Ti 2p peak, (c) O 1s peak, and (d) Ni 2p peak.

(a)

(b)

(c)

(d)