2025/04/18 by Jinze Lyu, Yaxin Zhao, Ziyi Zhong +3
Energy · Materials Science · #TiO2 Photocatalysis and Solar Cells #Advanced Photocatalysis Techniques #Catalytic Processes in Materials Science
paper · doi:10.1016/j.envres.2025.121649
Understanding the key factors that influence the interfacial transfer of charge carriers is crucial for improving the photocatalytic degradation of volatile organic compounds (VOCs). Herein, TiO 2 samples with dominantly exposed (001) and (101) facets were synthesized. The density and types of hydroxyls on these facets were modified through alkali treatment . The surface photovoltage spectrum was measured in various atmospheres to analyze the interfacial charge transfer processes. The alkali treatment created additional terminal hydroxyls (OH t ) on the (001) facets and bridging hydroxyls (OH b ) on the (101) facets. OH t enhanced the migration of holes toward the (001) facets, and OH b facilitated the migration of electrons toward the (101) facets, thereby promoting charge separation. The accumulation of holes on the (001) facets was limited in the absence of OH t . H 2 O significantly enhanced charge separation in the presence of O 2 and toluene, thereby improving both the adsorption and degradation of toluene. This work provides new insights into the interfacial processes involved in photocatalytic degradation of VOCs.