fig8

Figure 8. Mott-Schottky plots have frequencies from 500 to 2,000 Hz. (A) Ti/Fe₂O₃ photoanode; (B) Ti/Fe₂O₃/Cu₂S photoanode; (C) Ti/Fe₂O₃/Co(OH)_x photoanode; (D) Ti/Fe₂O₃/Cu₂S/Co(OH)_x photoanode; (E) Frequency (500 to 1,500 Hz) of the Mott-Schottky diagram of Cu₂S nanoparticles; (F) The carrier concentrations of Ti/Fe₂O₃ photoanode (TF), Ti/Fe₂O₃/Cu₂S photoanode (TFCu), Ti/Fe₂O₃/Co(OH)_x photoanode (TFCo), and Ti/Fe₂O₃/Cu₂S/Co(OH)_x photoanode (TFCuCo).