期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 202, 期 -, 页码 191-198出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2016.09.021
关键词
Nitrogen doped La2Ti2O7, g-C3N4; Layered composites; Charge transfer dynamics
资金
- National Science Foundation of China [51472013]
- Beijing Key Discipline Foundation of Condensed Matter Physics
- China Scholarship Council (CSC)
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of the Japanese Government [25220806, 25288035]
Perovskite-type La2Ti2O7 (LTO), having a layered structure and the separated H-2 and O-2 evolution sites, is attractive as an efficient photocatalyst. However, the photocatalytic activity is often limited by the poor electron mobility. This problem can be conquered by hybridization with materials having efficient properties for the visible light absorption and charge carrier transport. Here, we report a two-dimensional (2D) layered composite hybridized by approximately 2 nm thick graphitic C3N4 nanosheets (g-C3N4) and 7 nm thick nitrogen doped LTO nanosheets (NLTO) (g-C3N4/NLTO), in which g-C3N4 and NLTO act as hole receptor and electron conductor, respectively. g-C3N4/NLTO exhibited high photocatalytic activities for H-2 production via water splitting and dye degradation under the UV and visible light irradiation, due to the interfacial charge transfer between g-C3N4 and NLTO. The electrochemical measurement showed the type II band alignment with favorable charge transfer from g-C3N4 to NLTO. The 2D architecture with a maximized interfacial area allows efficient charge separation with a short interfacial distance. This efficient interfacial charge transfer is further elucidated from monitoring of charge separation and trapping processes using the femtosecond time-resolved diffused reflectance (TDR) measurement. (C) 2016 Elsevier B.V. All rights reserved.
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