Bi2WO6-x nanosheets with tunable Bi quantum dots and oxygen vacancies for photocatalytic selective oxidation of alcohols

Wang, Jinguo; Liang, Hao; Zhang, Chi; Jin, Bei; Men, Yongfeng

doi:10.1016/j.apcatb.2019.117874

Cited by 142 publications

(56 citation statements)

References 68 publications

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“…The inset of Fig. 11(c) clearly shows these structures, which were identified as metallic Bi and were also observed in other works 27,34,118,119 . The insets of Fig.…”

Section: Resultssupporting

confidence: 83%

Femtosecond-laser-irradiation-induced structural organization and crystallinity of Bi2WO6

Pinatti

Gouveia

Doñate‐Buendía

et al. 2020

Sci Rep

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controlling the structural organization and crystallinity of functional oxides is key to enhancing their performance in technological applications. in this work, we report a strong enhancement of the structural organization and crystallinity of Bi 2 Wo 6 samples synthetized by a microwave-assisted hydrothermal method after exposing them to femtosecond laser irradiation. X-ray diffraction, UVvis and Raman spectroscopies, photoluminescence emissions, energy dispersive spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy were employed to characterize the as-synthetized samples. To complement and rationalize the experimental results, firstprinciples calculations were employed to study the effects of femtosecond laser irradiation. Structural and electronic effects induced by femtosecond laser irradiation enhance the long-range crystallinity while decreasing the free carrier density, as it takes place in the amorphous and liquid states. these effects can be considered a clear cut case of surface-enhanced Raman scattering.Bismuth tungstate, Bi 2 WO 6 (BWO), is an important n-type semiconductor with a narrowband gap energy (E gap ) of 2.8 eV that allows efficient absorption of visible light (λ > 400 nm) and has been widely studied due to its wide range of properties, such as ferroelectricity, piezoelectricity, pyroelectricity, nonlinear dielectric susceptibility, and photoluminescent emissions 1,2 . The multifunctionality of this material has been demonstrated on its photocatalytic activity 3-22 , photocatalytic degradation of drugs 23 , dyes 24-26 alcohols 27 , and phenol 28 , environmental purification, energy conversion 29 , and production of sustainable and combustible compounds 3 . Recently, some works attested this material to be efficient in water splitting for hydrogen generation 30-32 , for shielding against low-energy gamma rays 33 and for CT/IR imaging and photothermal/photodynamic therapy of tumours 34,35 .BWO has an orthorhombic structure and belongs to the Aurivillius family. It is formed by alternating (Bi 2 O 2 ) n 2n+ and perovskite (WO 4 ) n 2n layers 36 , which are composed of (WO 6 ) octahedral layers and (Bi-O-Bi) layers. Their crystal structure can also be described by alternating [Bi 2 O 2 ] 2+ slabs and [WO 4 ] 2− slabs, with oxygen atoms shared between the slabs to create chemical bonds. An important characteristic of this structure is that local environments of both W and Bi cations are highly distorted 37 . The off-centre octahedral distortions are a general feature of the structural chemistry of d 0 metal cations. Each W cation is coordinated with six O atoms to form [WO 6 ] octahedral clusters that are connected to each other by corner-sharing O atoms. The (Bi 2 O 2 ) 2+ layers are sandwiched between (WO 6 ) octahedral layers. From an electronic point of view, BWO presents hybridized valence bands occupied by the Bi 6 s and O 2p states that shift the absorption band edge towards the visible region, with the concomitant appearance of a narrow absorpt...

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“…The inset of Fig. 11(c) clearly shows these structures, which were identified as metallic Bi and were also observed in other works 27,34,118,119 . The insets of Fig.…”

Section: Resultssupporting

confidence: 83%

Femtosecond-laser-irradiation-induced structural organization and crystallinity of Bi2WO6

Pinatti

Gouveia

Doñate‐Buendía

et al. 2020

Sci Rep

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“…[ 112–115 ] For instance, the Bi 2 WO 6‐x nanosheets showed outstanding stability and durability, and exhibited highly increased activity owing to the synergistic effect between the Bi quantum dots and oxygen vacancies. [ 116 ] In addition, Sun et al . prepared Bi 2 WO 6 nanosheets in which graphene oxide mediated the cogeneration of doped C and oxygen defects.…”

Section: Modulated Strategies Of Bi2wo6‐based Materials With Multifunmentioning

confidence: 99%

“…The introduction of metallic Bi not only exhibited enhanced visible light absorption, but also was of significance of the electronic properties of the composites. In addition, there are also other works about Bi deposited Bi 2 WO 6 , such as Bi and I – comodified Bi 2 WO 6 , [ 44 ] Bi 2 WO 6‐x nanosheets with tunable Bi quantum dots and oxygen vacancies, [ 116 ] and in situ Bi 2 O 3 and Bi particles deposited Bi 2 WO 6 . [ 142 ] The Bi 2 WO 6 samples deposited by Bi metal prepared by the above scholars all exhibited enhanced photocatalytic activity.…”

Section: Modulated Strategies Of Bi2wo6‐based Materials With Multifunmentioning

confidence: 99%

“…Additionally, we deeply illustrate and analyze the connections between the morphological, photophysics and photochemical properties of Bi 2 WO 6 , which include dopant or defect structures, metal deposition techniques, semiconductor combinations and surface modification by carbon‐based materials with conjugated π‐structures. [ 39–181 ] We critically review the practical applications of water splitting, pollutant removal, and especially CO 2 reduction. These aspects reflect the research status of Bi 2 WO 6 , as well as its potential and opportunities in the field of clean energy and environmental protection.…”

Section: Introductionmentioning

confidence: 99%

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Recent progress in Bi₂WO₆‐Based photocatalysts for clean energy and environmental remediation: Competitiveness, challenges, and future perspectives

et al. 2020

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The efficient utilization of photocatalytic technology is essential for clean energy and environmental remediation. Bismuth tungstate (Bi2WO6), an appealing Aurivillius phase perovskite, has arisen widespread attention as a visible light responsive photocatalyst applied in environment due to its low cost, nontoxicity, modifiable morphology, and outstanding optical and chemical properties. Nevertheless, the photocatalytic activity of pure Bi2WO6 is unsatisfactory because of its relative small specific surface area, poor quantum yield, and the rapid recombination of photogenerated carriers. Therefore, many strategies, namely, morphological control, dopant or defect introduction, metal deposition, semiconductor combination and surface modification by carbon‐based materials with conjugated π‐structures, have been systematically studied to enhance the photocatalytic performance of Bi2WO6 in the past few years. In order to better explore and study the application of bismuth‐based perovskite oxides in the field of photocatalysis, this review summarizes the recent research progress on Bi2WO6‐based photocatalysts. Moreover, in terms of the improved photocatalytic activity of Bi2WO6‐based photocatalysts, three main applications, including water splitting, pollutants removal, and CO2 reduction, are introduced in detail and critically reviewed. Eventually, the prospects, opportunities, and challenges of Bi2WO6‐based photocatalysts are pointed out. This comprehensive review is expected to put forward valuable suggestions for designing of Bi2WO6‐based photocatalysts applied in clean energy production and environmental remediation on the premise of consolidating the existing theoretical basis of photocatalysis.

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“…However, the practical application of Bi2WO6 is still hindered by the high recombination rate of its photo-generated electron-hole pairs and narrow light-responsive region. To this end, many modification strategies have been developed to efficiently utilize the solar energy and promote its activity [25][26][27][28][29]. Among these strategies, coupling Bi2WO6 with suitable cocatalysts to fabricate heterojunctions is proven to be an effective strategy for promoting the separation of the photogenerated carriers and broadening the light-responsive region [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

2D/2D type-II Cu2ZnSnS4/Bi2WO6 heterojunctions to promote visible-light-driven photo-Fenton catalytic activity

Guo

Zhang

Han

et al. 2020

Chinese Journal of Catalysis

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Bi2WO6-x nanosheets with tunable Bi quantum dots and oxygen vacancies for photocatalytic selective oxidation of alcohols

Cited by 142 publications

References 68 publications

Femtosecond-laser-irradiation-induced structural organization and crystallinity of Bi2WO6

Femtosecond-laser-irradiation-induced structural organization and crystallinity of Bi2WO6

Recent progress in Bi₂WO₆‐Based photocatalysts for clean energy and environmental remediation: Competitiveness, challenges, and future perspectives

2D/2D type-II Cu2ZnSnS4/Bi2WO6 heterojunctions to promote visible-light-driven photo-Fenton catalytic activity

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Bi2WO6-x nanosheets with tunable Bi quantum dots and oxygen vacancies for photocatalytic selective oxidation of alcohols

Cited by 142 publications

References 68 publications

Femtosecond-laser-irradiation-induced structural organization and crystallinity of Bi2WO6

Femtosecond-laser-irradiation-induced structural organization and crystallinity of Bi2WO6

Recent progress in Bi2WO6‐Based photocatalysts for clean energy and environmental remediation: Competitiveness, challenges, and future perspectives

2D/2D type-II Cu2ZnSnS4/Bi2WO6 heterojunctions to promote visible-light-driven photo-Fenton catalytic activity

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Recent progress in Bi₂WO₆‐Based photocatalysts for clean energy and environmental remediation: Competitiveness, challenges, and future perspectives