Journal
SCIENCE BULLETIN
Volume 65, Issue 16, Pages 1389-1395Publisher
ELSEVIER
DOI: 10.1016/j.scib.2020.04.042
Keywords
Photocatalysis; Water splitting; Product selectivity; Reaction pathway; Metal/semiconductor junction
Categories
Funding
- National Natural Science Foundation of China [51672210, 21875183]
- National Key Research and Development Program of China [2017YFE0193900]
- National Program for Support of Top-notch Young Professionals
- Fundamental Research Funds for the Central Universities
- Natural Science Basic Research Plan in Shaanxi Province of China [2018JQ2028]
- China Postdoctoral Science Foundation [2018M640981]
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A novel metal/semiconductor photocatalyst, Cu nanoparticles (NPs) modified TiO2 hollow spheres (Cu/TiO2), was designed for efficient photocatalytic overall water splitting (POWS) under both ultraviolet (UV) and visible (Vis) light. This Cu/TiO2 photocatalyst possesses excellent POWS performance under Vis light at the highest level among the reported TiO2-based photocatalysts. Interestingly, the metal/ semiconductor junction formed between Cu and TiO2 enables controlled water-oxidation product selectivity (H2O2 or O-2) via different reaction pathways regulated by irradiation wavelengths. Under UV light, the electrons excited in TiO2 are captured by Cu NPs through the Cu/TiO2 Schottky interface for H-2 production, with the photoholes in TiO2 producing H2O2 through a two-electron process; whilst under Vis light, Cu NPs act as plasmon to inject hot electrons to TiO2 for H-2 production, while O-2 is produced by hot holes on Cu NPs via a four-electron process. This rational design of function-switchable metal/semiconductor junction may be helpful to understand the mechanisms for POWS with desired gas/liquid water-oxidation products. (C) 2020 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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