A surface science perspective on TiO photocatalysis

The field of surface science provides a unique approach to understanding bulk, surface and interfacial phenomena occurring during TiO ₂ photocatalysis. This review highlights, from a surface science perspective, recent literature that provides molecular-level insights into photon-initiated events occurring at TiO ₂ surfaces. Seven key scientific issues are identified in the organization of this review. These are: (1) photon absorption, (2) charge transport and trapping, (3) electron transfer dynamics, (4) the adsorbed state, (5) mechanisms, (6) poisons and promoters, and (7) phase and form. This review ends with a brief examination of several chemical processes (such as water splitting) in which TiO ₂ photocatalysis has made significant contributions in the literature.