Fig. 7: Structure characterization of different C3N4.

A–C XPS spectra of CN-OA-m of C 1 s, N 1 s, K 2p; (D) The pore size distribution; (E) The photoluminescence (PL) spectra; (F) Photocurrent responses; (G) The electrochemical impedance spectra (EIS); (H) Time-resolved photoluminescence (TRPL) spectra; (I) Electrochemical potential diagrams.