Creation of rich oxygen vacancies in bismuth molybdate nanosheets to boost the photocatalytic nitrogen fixation performance under visible light illumination

Gui, Li; Yang, Weiyi; Gao, Shuang; Shen, Qianqian; Xue, Jinbo; Chen, Kexin; Li, Qi

doi:10.1016/j.cej.2020.127115

Cited by 78 publications

(52 citation statements)

References 46 publications

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“…Alkali assisted etching is another force-induced defect method with benefits of simpleness, efficiency, and low cost. OVs enriched Bi2MoO6 [164] and bimetallic layered-doublehydroxide (LDH) (ZnCr-LDH, ZnAl-LDH, and NiAl-LDH) nanosheets [165] were produced via an alkali etching approach. Alternatively, ultrasound irradiation was also shown to create defects mainly due to cavitation and induced ultrasonication chemistry [46,[166][167][168].…”

Section: Force-induced Strategiesmentioning

confidence: 99%

Photocatalytic nitrogen reduction to ammonia: Insights into the role of defect engineering in photocatalysts

et al. 2021

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Engineering of defects in semiconductors provides an effective protocol for improving photocatalytic N2 conversion efficiency. This review focuses on the state-of-the-art progress in defect engineering of photocatalysts for the N2 reduction toward ammonia. The basic principles and mechanisms of thermal catalyzed and photon-induced N2 reduction are first concisely recapped, including relevant properties of the N2 molecule, reaction pathways, and NH3 quantification methods. Subsequently, defect classification, synthesis strategies, and identification techniques are compendiously summarized. Advances of in situ characterization techniques for monitoring defect state during the N2 reduction process are also described. Especially, various surface defect strategies and their critical roles in improving the N2 photoreduction performance are highlighted, including surface vacancies (i.e., anionic vacancies and cationic vacancies), heteroatom doping (i.e., metal element doping and nonmetal element doping), and atomically defined surface sites. Finally, future opportunities and challenges as well as perspectives on further development of defect-engineered photocatalysts for the nitrogen reduction to ammonia are presented. It is expected that this review can provide a profound guidance for more specialized design of defect-engineered catalysts with high activity and stability for nitrogen photochemical fixation.

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Section: Force-induced Strategiesmentioning

confidence: 99%

Photocatalytic nitrogen reduction to ammonia: Insights into the role of defect engineering in photocatalysts

et al. 2021

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“…8, 24 To enhance the efficiency of electron transfer, the active sites on the surface of the photocatalyst should be able to adsorb N 2 molecules efficiently. 9,25,26 The active sites adsorbing N 2 molecules could be used as thoroughfares to ensure that the photoexcited electrons can be efficiently transferred from the photocatalyst to N 2 molecules and participate in the reduction reaction of N 2 . Thus, many strategies have been studied to create suitable active sites for N 2 chemisorption on the surface of photocatalysts.…”

Section: ■ Introductionmentioning

confidence: 99%

2D WO_3–x Nanosheet with Rich Oxygen Vacancies for Efficient Visible-Light-Driven Photocatalytic Nitrogen Fixation

Yang

Wang²,

Wang

et al. 2022

Langmuir

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Oxygen vacancy modulation holds great promise for enhancing the photocatalytic activity for efficient nitrogen fixation under mild conditions. In this work, the two-dimensional WO 3−x nanosheets with rich oxygen vacancies were prepared using solvothermal synthesis. The WO 3−x nanosheets (rich oxygen vacancies) display nice photocatalytic activity for N 2 reduction to ammonia with a high yield rate of 82.41 μmol•g cat −1•h −1 under irradiation of visible light (420 nm), which is 3.59 times higher than that of the WO 3−x nanoparticles (poor oxygen vacancies). Electron spin resonance (ESR), N 2 adsorption−desorption isotherms, and transient photocurrent responses in the N 2 or Ar atmosphere experiments proved that the rich oxygen vacancies, which are induced by the nanosheet structure, could serve as active sites for the chemisorption of N 2 and facilitate the electron transfer from unsaturated sites to activated N 2 . Moreover, based on the analysis of banding energy, the oxygen vacancies not only boosted the ability of visible light harvesting but also elevated the defect energy level to the Fermi level, further inhibiting the defect relaxation effect. The findings offer an insight into the design of the efficient photocatalysts via structure engineering and defect engineering for photocatalytic N 2 fixation.

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“…We introduce several basic mechanisms for the photocatalytic nitrogen fixation reaction and then discuss some problems that exist in the photocatalytic nitrogen fixation process. After that, we focus on some typical catalysts and their modification methods, such as surface vacancies, 33–38 element doping 39–42 and heterojunction modification, 43–48 etc. Finally, the prospects of efficient nitrogen-fixing and photocatalytic nitrogen fixation are discussed (Fig.…”

Section: Introductionmentioning

confidence: 99%

Structural design and control of photocatalytic nitrogen-fixing catalysts

Xia

et al. 2022

J. Mater. Chem. A

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Creation of rich oxygen vacancies in bismuth molybdate nanosheets to boost the photocatalytic nitrogen fixation performance under visible light illumination

Cited by 78 publications

References 46 publications

Photocatalytic nitrogen reduction to ammonia: Insights into the role of defect engineering in photocatalysts

Photocatalytic nitrogen reduction to ammonia: Insights into the role of defect engineering in photocatalysts

2D WO_3–x Nanosheet with Rich Oxygen Vacancies for Efficient Visible-Light-Driven Photocatalytic Nitrogen Fixation

Structural design and control of photocatalytic nitrogen-fixing catalysts

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Creation of rich oxygen vacancies in bismuth molybdate nanosheets to boost the photocatalytic nitrogen fixation performance under visible light illumination

Cited by 78 publications

References 46 publications

Photocatalytic nitrogen reduction to ammonia: Insights into the role of defect engineering in photocatalysts

Photocatalytic nitrogen reduction to ammonia: Insights into the role of defect engineering in photocatalysts

2D WO3–x Nanosheet with Rich Oxygen Vacancies for Efficient Visible-Light-Driven Photocatalytic Nitrogen Fixation

Structural design and control of photocatalytic nitrogen-fixing catalysts

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Product

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2D WO_3–x Nanosheet with Rich Oxygen Vacancies for Efficient Visible-Light-Driven Photocatalytic Nitrogen Fixation