Light‐Induced Dynamic Stability of Oxygen Vacancies in BiSbO4 for Efficient Photocatalytic Formaldehyde Degradation

Defect engineering has been regarded as a versatile strategy to maneuver the photocatalytic activity. However, there are a few studies concerning how to maintain the stability of defects, which is important to ensure sustainable photocatalytic performance. Here, a novel strategy to modulate the stru...

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Bibliographic Details
Published in:Energy & environmental materials (Hoboken, N.J.) N.J.), 2022-01, Vol.5 (1), p.305-312
Main Authors: Ran, Maoxi, Cui, Wen, Li, Kanglu, Chen, Lvcun, Zhang, Yuxin, Dong, Fan, Sun, Yanjuan
Format: Article
Language:English
Subjects:
Absorption spectra
Catalytic activity
Defects
Dynamic stability
Electromagnetic absorption
Formaldehyde
formaldehyde degradation
Free energy
Gibbs free energy
Oxidation
Oxygen
oxygen vacancy
Photocatalysis
Photodegradation
Photooxidation
reaction mechanism
Reaction mechanisms
Recombination
Replenishment
Vacancies
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Summary:Defect engineering has been regarded as a versatile strategy to maneuver the photocatalytic activity. However, there are a few studies concerning how to maintain the stability of defects, which is important to ensure sustainable photocatalytic performance. Here, a novel strategy to modulate the structural properties of BiSbO4 using light‐induced dynamic oxygen vacancies is reported by us for efficient and stable photocatalytic oxidation of formaldehyde. Interestingly, the continuous consumption and replenishment of vacancies (namely dynamic vacancies) ensure the dynamic stability of oxygen vacancies, thus guaranteeing the excellent photocatalytic stability. The oxygen vacancies could also accelerate the electron migration, inhibit the photogenerated electron/hole recombination, widen the light absorption spectra, and thus improve the photocatalytic formaldehyde removal performance. Combined with the results of in situ DRIFTS, the reaction mechanism for each step of formaldehyde oxidation is revealed. As supported by DFT calculation of Gibbs free energy, the introduction of oxygen vacancies into BiSbO4 can promote spontaneous process of formaldehyde oxidation. Our work highlights a promising approach for stabilizing the defects and proposes the photocatalytic reaction mechanism in combination with the thermodynamic functions. The construction of dynamic oxygen defects in BiSbO4 not only maintains the stability of defects, but also contributes to the high efficiency for photocatalytic formaldehyde oxidation.
ISSN:2575-0356
2575-0356
DOI:10.1002/eem2.12176