Fig. 2: Synthesis and characterization of nCN_x photocatalyst.

Synthesis of nCN_x through calcination of melamine (a) and characterization of the obtained nCN_x sample via N₂ physisorption (b), X-ray diffraction (c), UV-Vis absorbance spectroscopy (d), corresponding Tauc plot (e), UPS spectra (f) and conductive and valance energy levels of nCN_x (g).