Journal
NANO ENERGY
Volume 51, Issue -, Pages 764-773Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2018.07.018
Keywords
Photocatalysis; Hierarchical structures; Oxygen vacancies; Water splitting; DFT calculations
Categories
Funding
- National Natural Science Foundation of China [51578531, 51572016, U1530401]
- Royal Society Newton Advanced Fellowship [NAF/R1/180242]
- Beijing Computational Science Research Center (CSRC) [U1501501]
- Special Program for Applied Research on Super Computation of the NSFC-Guangdong [U1501501]
- National Key R&D Program of China [2016YFC0400502]
- UK EPSRC grant [EP/N009533/1]
- Royal Society-Newton Advanced Fellowship grant [NA150418]
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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) O-2 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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