Photocatalytic and Photoelectrochemical Water Splitting on TiO₂ via Photosensitization

Figure 13

Relative Fermi level and band edge positions of CdS and CdSe before (a) and after (b) Fermi level alignment due to their contact. The proposed band edges structures for the TiO₂/CdS/CdSe (c) and TiO₂/CdSe/CdS (d) electrodes in equilibrium with the redox couples in the electrolyte. The Fermi levels () indicated in (a) and (b) are OCPs (versus Ag/AgCl) measured in dark conditions. Reprinted with permission from [11]. Copyright 2009, American Chemical Society.

(a)

(b)

(c)

(d)