Role of Dissociatively Adsorbed Water on the Formation of Shallow Trapped Electrons in TiO2 Photocatalysts.

ABSTRACT: The mismatch between short lifetimes of free charge carriers and slow kinetics of surface redox reactions substantially limits the efficiency of most photocatalytic systems. Hence, the knowledge of trapping and recombination of photogenerated electrons and holes at different time scales is key for a rational optimization of photocatalytic materials. In this study, we used subsecond time-resolved diffuse-reflectance FTIR spectroscopy to investigate how energy and intensity of the incident irradiation affect the dynamics of photogenerated charge carriers in TiO2 P25 photocatalysts subjected to different pretreatments and how shallow trapped electrons (STE) are formed under these conditions. Intensity-dependent measurements demonstrated that electrons and holes generated by 325 and 409 nm irr

SUBMITTER: Litke A 

PROVIDER: S-EPMC5432959 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature