(Photo)electrochemical Methods for the Determination of the Band Edge Positions of TiO₂-Based Nanomaterials

Figure 11

(a) Absorbance changes (at 780 nm) of a transparent nanocrystalline TiO₂ film recorded during a cathodic potential sweep in a deaerated LiClO₄ (0.1 M) solution with adjusted pH. The arrows indicate potentials at which the values of quasi-Fermi level were read off. (b) pH dependence of quasi-Fermi levels of a transparent nanocrystalline TiO₂ film. Measurements were performed outside the neutral pH range in order to avoid pH fluctuations due to reduction of protons [206].

(a)

(b)