An <i>in situ</i> assembled WO<sub>3</sub>–TiO<sub>2</sub> vertical heterojunction for enhanced Z-scheme photocatalytic activity
Yue Liu, Xiangkang Zeng, Christopher D. Easton, Qinye Li, Yun Xia, Yichun Yin, Xiaoyi Hu, Jian Hu, Dehua Xia, David McCarthy, Ana Deletić, Chenghua Sun, Jiaguo Yu, Xiwang Zhang
Abstract
The face-to-face contact of a vertical heterojunction is beneficial to charge interaction in photocatalysis. However, constructing a vertical heterojunction with uncompromised redox ability still remains a challenge. Herein, we report the successful synthesis of a WO3-TiO2 vertical heterojunction via establishing an internal electric field across the interface. Experimental investigation and computational simulations reveal that strong electric coupling occurs at the WO3-TiO2 interface forming an internal electric field. The internal electric field induces a Z-scheme charge-carrier transfer through the heterojunction under light irradiation, which leads to effective charge separation and maintains high reaction potentials of charge-carriers. The improved photocatalytic activity of the WO3-TiO2 heterojunction is proved by enhanced generation of reactive oxygen species and accelerated Escherichia coli (E. coli) disinfection. This study provides new insights into understanding and designing Z-scheme heterogeneous photocatalysts.