Journal
ACS CATALYSIS
Volume 10, Issue 2, Pages 1439-1443Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.9b04789
Keywords
monolayer Bi2WO6; subsurface; defect engineering; photocatalysis; organic transformation
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Funding
- Research Foundation - Flanders (FWO) [G.0B39.15, G.0B49.15, G098319N, ZW15_09-G0H6316]
- Research Foundation -Flanders (FWO) [12Y7218N, 12R8718N]
- European Union (Horizon 2020) Marie Sklodowska-Curie innovation program [722591]
- KU Leuven Research Fund [C14/15/053]
- Flemish government through long-term structural funding Methusalem (CASAS2) [Meth/15/04]
- Hercules foundation [HER/11/14, AKUL/13/19]
- NSFC [21773031]
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Defect engineering in photocatalysts represents a fundamental method toward tailoring their solar-to-chemical energy conversion performance, although determining the nature and impact of subsurface defects remains challenging. Single-unit-cell Bi2WO6 monolayers, forming a sandwich-like structure, [BiO](+)-[WO4](2-)-[BiO](+), exhibit promising photocatalytic performance and are an ideal system for isolating subsurface defects. We report the single-step synthesis of Bi2WO6 monolayers rich in stable interior W vacancies and characterize their influence on the physical properties necessary for effective photocatalytic surface reactions. Defect-rich monolayers benefit from enhanced visible-light absorption and photocarrier transport, boosting the solar photocatalytic oxidation of benzylic alcohols by 140% at no cost to selectivity or stability. This work highlights the importance of subsurface defects within surface-driven photocatalytic applications and prescribes a general strategy for their isolated study via 2D compounds exhibiting symmetric surface termination.
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