Wei, T; Zhu, Y-N; Gu, Z; An, X; Liu, L-M; Wu, Y; Liu, H; ... Qu, J; + view all Wei, T; Zhu, Y-N; Gu, Z; An, X; Liu, L-M; Wu, Y; Liu, H; Tang, J; Qu, J; - view fewer (2018) Multi-electric field modulation for photocatalytic oxygen evolution: Enhanced charge separation by coupling oxygen vacancies with faceted heterostructures. Nano Energy , 51 pp. 764-773. 10.1016/j.nanoen.2018.07.018.

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Abstract

A fundamental challenge of photocatalysis is developing efficient strategies to suppress the recombination of photogenerated charge carriers. Herein, ZnO/BiVO4 hierarchical nanostructures were exemplified to demonstrate new concept of multi-electric field-assisted charge separation. The contribution of both facet engineering and defect modulation to the facilitated photocatalysis was confirmed by both experimental observations and theoretical calculations. Such integration of built-in fields in faceted BiVO4 and anisotropic ZnO nanorods, together with the possible Z-scheme at the interfaces resulted into 1.36 mmol h−1 g−1 O2 produced under visible light irradiation, and more than one order of magnitude enhanced apparent quantum yield at 450 nm. This work not only provides fundamental insights into the facet-dependent distribution of interfacial defects, but also offers a strategy for the design of faceted heterojunctions with controlled vacancies for significantly enhanced charge separation.

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