Bi2WO6 hollow microspheres with high specific surface area and oxygen vacancies for efficient photocatalysis N2 fixation

Wang, Tianyu; Feng, Caiting; Liu, Jiquan; Wang, Danjun; Hu, Huai‐Ming; Hu, Jun; Chen, Zhong; Xue, Gi

doi:10.1016/j.cej.2021.128827

Cited by 121 publications

(63 citation statements)

References 79 publications

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“…Overall, the Bi 2 WO 6 hollow microspheres demonstrated a NH 3 yield of $53 mmol g À1 h À1 under simulated sunlight. 46 Similarly, in addition to enhance the light harvesting capacity, the oxygen vacancies on BiOCl, 47 TiO 2 [48][49][50] and BiOBr 51 also serve as the active sites for N 2 activation and reduction while the oxygen vacancies on Bi 3 FeMo 2 O 12 help adsorb and stabilize the N-H intermediate during N 2 activation, 52 which cooperatively boost NH 3 production via PNF (Fig. 3).…”

Section: Semiconductors As Photocatalysts For Pnfmentioning

confidence: 99%

A minireview on catalysts for photocatalytic N₂ fixation to synthesize ammonia

Gao

Wang

et al. 2022

RSC Adv.

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Section: Semiconductors As Photocatalysts For Pnfmentioning

confidence: 99%

A minireview on catalysts for photocatalytic N₂ fixation to synthesize ammonia

Gao

Wang

et al. 2022

RSC Adv.

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“…A considerable number of metal oxides, such as Ti-based [191,248,258], Bi-based [41,259,260], layered-double-hydroxide (LDH) [169], W 6+ [245], Mo 6+ [261,262], In 3+ [121,263], Ce 4+ [47] oxides have been reported to be active for the N2 photoreduction. Among these oxides, oxygen-vacancy-rich TiO2 is the most investigated semiconductor material for the N2 photoreduction.…”

Section: Oxygen Vacancies (Anion Defects)mentioning

confidence: 99%

“…Nanostructuring by controlling the desired morphologies (e.g., particle size, shape, geometrical feature, and surface texture) can maximize the exposure of active sites, accelerate carrier transportation and migration, being beneficial to photocatalysis [80]. Defect engineering in combination with morphology control allows one to further improve photocatalytic N2 reduction activity, taking full advantages of joint/synergistic effects [260]. Such concept has been demonstrated by construction of light-switchable oxygen vacancies in ultrafine Bi5O7Br nanotubes, which realized active and stable photocatalytic N2 reduction [180].…”

Section: Coupling Defect Engineering and Morphology Controlmentioning

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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“…Therefore, the OVs-BWO material provides an alternative for efficient N2 fixation under ambient conditions using atmosphere and water as feedstock and sunlight as driving force. 100 Copyright 2021 American Chemical Society.…”

Section: N2 Fixationmentioning

confidence: 99%

“…(a) Models of four possible active sites for Bi2WO6 (010) surface, W site, Bi site, Bi site with OV, Bi site with 2OVs, (b) N-N distance of free N2 and N2 on four possible active sites, respectively, (c) Gibbs free energy during reaction processes of two different mechanisms (the first mechanism: * + N2→*NN→*NNH→*NNH2 →*N + NH3→*NH→*NH2→*NH3→ * + NH3; the second mechanism: * + N2 → *NN → *NNH → *NHNH → *NHNH2 → *NH + NH3 → *NH2 → *NH3 → * + NH3, where * represents the active site)and (d) the free-energy profile of three possible processes for BWO W site as well as BWO Bi site with 2OVs. Reprinted with permission from Ref 100. Copyright 2021 American Chemical Society.…”

mentioning

confidence: 99%