Chloridion-induced dual tunable fabrication of oxygen-deficient Bi2WO6 atomic layers for deep oxidation of NO

Abstract

Engineering an efficient interface is a trustworthy strategy for designing advanced photocatalytic systems for solar energy conversion. Herein, oxygen-deficient Bi2WO6 atomic layers without organic residues were successfully fabricated via a facile solvothermal strategy by the multifunctional regulatory mechanism of introduced chloridion. Both DFT calculations and speciation determination revealed that chloridion displayed a more pronounced effect in the controllable synthesis of oxygen-deficient Bi2WO6 atomic layers without organic residues: ultrathinning and defect-engineering. This built-in multi-cooperative interface endowed Bi2WO6 with intriguing photoelectrochemical properties, O2 activation ability, and ultrahigh activity in visible-light powered deep oxidation of NO. A reasonable photocatalytic mechanism was proposed based on in situ infrared spectroscopy analysis and theoretical calculations. We believe that this multi-cooperative interface engineering of oxygen-deficient Bi2WO6 atomic layers without organic residues could provide new insights into the design of two-dimensional (2D) layered materials with efficient active sites and pave the way for efficient NO photooxidation systems.