An in situ assembled WO3-TiO2 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 T. McCarthy, Ana Deletic, Chenghua Sun, Jiaguo Yu, Xiwang Zhang

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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.

Original languageEnglish
Pages (from-to)8775-8784
Number of pages10
JournalNanoscale
Volume12
Issue number16
DOIs
Publication statusPublished - 28 Apr 2020

Cite this

Liu, Y., Zeng, X., Easton, C. D., Li, Q., Xia, Y., Yin, Y., Hu, X., Hu, J., Xia, D., McCarthy, D. T., Deletic, A., Sun, C., Yu, J., & Zhang, X. (2020). An in situ assembled WO3-TiO2 vertical heterojunction for enhanced Z-scheme photocatalytic activity. Nanoscale, 12(16), 8775-8784. https://doi.org/10.1039/d0nr01611j