Photocatalytic and Photoelectrochemical Water Splitting on TiO₂ via Photosensitization

Figure 14

Illustrative diagrams of energy transfer among Yb³⁺, Tm³⁺, and TiO₂; the generation of OH radicals via the reaction of electron and hole with the surface species of TiO₂; and the energy scales. Reprinted with permission from [11]. Copyright 2013, American Chemical Society.