Light-Induced Dynamic Stability of Oxygen Vacancies in BiSbO 4 for Efficient Photocatalytic Formaldehyde Degradation

Energy & Environmental Materials

article

Maoxi Ran¹  Wen Cui¹  Kanglu Li¹  Lvcun Chen²  Yuxin Zhang³  Fan Dong¹  Yanjuan Sun¹ 

[1] School of Resources and Environment, University of Electronic Science and Technology of China;Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University;College of Materials Science and Engineering, Chongqing University;Yangtze Delta Region Institute ,(Huzhou), University of Electronic Science and Technology of China;State Centre for International Cooperation on Designer Low-carbon and Environmental Materials ,(CDLCEM), School of Materials Science and Engineering, Zhengzhou University

关键词: dynamic stability;    formaldehyde degradation;    oxygen vacancy;    photocatalysis;    reaction mechanism;   

DOI  :  10.1002/eem2.12176

来源: Wiley

【 摘 要 】

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 BiSbO 4 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 BiSbO 4 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.

【 授权许可】

Unknown