Photocatalytic and Photoelectrochemical Water Splitting on TiO₂ via Photosensitization

Figure 2

The lower edge of the conduction band (red color) and upper edge of the valence band (green color) of various semiconductors are presented along with the bandgap in electron volts. The energy scale is indicated in electron volts using either the normal hydrogen electrode (NHE) or the vacuum level as a reference. Reprinted with permission from [2]. Copyright 2001, Nature Publishing Group.