Fig. 4. (A) UV-vis DRS of Ti14(NH4)2 and Ti14Cs2. (B) Kubelka–Munk function curves. (C) Mott–Schottky plots of Ti14(NH4)2 and Ti14Cs2 at various frequencies, from top to bottom, 100, 200, and 500 Hz. Electrolyte: 0.2 M Na2SO4 solution (1 : 10 v/v ethanol–water). (D) The density of states (DOS) plots of Ti14(NH4)2 and Ti14Cs2.
