Ferroelectric-assisted charge carrier separation over Bi<sub>2</sub>MoO<sub>6</sub> nanosheets for photocatalytic dye degradation

Hui, Kezhen; Dai, Fanqi; Guo, Limin; Li, Longtu; Wang, Xiaohui

doi:10.1039/d2nr02911a

Cited by 11 publications

(7 citation statements)

References 35 publications

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“…The Mo 3d spectrum of BMO displayed two peaks centered at 232.6 and 235.73 eV, which could be assigned to Mo 6+ 3d 5/2 and 3d 3/2 (Figure b) . The Bi 4f spectrum of BMO at 159.27 and 164.58 eV (Figure c) is in agreement with Bi 3+ 4f 7/2 and 4f 5/2 . Notably, the two peaks were determined in Figure d at 459.56 and 465.25 eV, which were assigned to the TS-1 of Ti 4+ 2p 3/2 and 2p 1/2 , respectively .…”

Section: Resultssupporting

confidence: 59%

“…43 The Bi 4f spectrum of BMO at 159.27 and 164.58 eV (Figure 3c) is in agreement with Bi 3+ 4f 7/2 and 4f 5/2 . 44 Notably, the two peaks were determined in Figure 3d at 459.56 and 465.25 eV, which were assigned to the TS-1 of Ti 4+ 2p 3/2 and 2p 1/2 , respectively. 45 However, the Ti 4+ 2p 3/2 peak area of TS-1/BMO was smaller in comparison to TS-1, and the Ti 4+ 2p 1/2 peak area was larger than TS-1, which might be because of the reduction of extra framework Ti species of TS-1.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

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Constructing a Titanium Silicon Molecular Sieve-Based Z-Scheme Heterojunction with Enhanced Photocatalytic Activity

Ma,

Yan,

Mao

et al. 2024

Langmuir

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Titanium silicon molecular sieve (TS-1) is an oxidation catalyst that possesses a long lifetime of charge transfer excited state, high Ti utilization efficiency, large specific surface area, and good adsorption property; therefore, TS-1 acts as a Tibased photocatalyst candidate. In this work, TS-1 coupled Bi 2 MoO 6 (TS-1/BMO) photocatalysts were fabricated via a facile hydrothermal route. Interestingly, the optimized TS-1/BMO-1.0 catalyst exhibited a decent photodegradation property toward tetracycline hydrochloride (85.49% in 120 min) under the irradiation of full spectrum light, which were 4.38 and 1.76 times compared to TS-1 and BMO, respectively. The enhanced photodegradation property of the TS-1/BMO-1.0 catalyst could be attributed to the reinforced light-harvesting capacity of the photocatalyst, high charge mobility, and suitable band structure for tetracycline hydrochloride degradation. In addition, the mechanism of photocatalytic degradation of tetracycline hydrochloride by the TS-1/BMO-1.0 catalyst was reasonably proposed based on the band structure, trapping, and ESR tests. This research provided feasible ideas for the design and construction of highefficiency photocatalysts for contaminant degradation.

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Section: Resultssupporting

confidence: 59%

Section: ■ Results and Discussionmentioning

confidence: 94%

Constructing a Titanium Silicon Molecular Sieve-Based Z-Scheme Heterojunction with Enhanced Photocatalytic Activity

Ma,

Yan,

Mao

et al. 2024

Langmuir

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“…The hybridization between O 2p and Bi 6s states at the valence band leads to a narrowed band gap (ranging from 2.4 to 2.7 eV), enabling effective visible light absorption (Figure S1). , Additionally, the IEF within Bi 2 MoO 6 , resulting from the polarization caused by the positive and negative charges of the (Bi 2 O 2 ) 2+ and (MoO 4 ) 2– layers, respectively, facilitates the efficient separation of photogenerated charge carriers. , Extensive investigations with various forms of Bi 2 MoO 6 have been reported for many applications such as the degradation of organic molecules, water oxidation to produce O 2 gas, NO oxidation, CO 2 reduction, amines coupling reaction, Cr(VI) reduction, and toluene and ethylbenzene oxidation. − However, the photocatalytic performance of Bi 2 MoO 6 is currently limited due to poor quantum efficiency, resulting from insufficient separation of photoexcited charge carriers and surface active sites …”

Section: Introductionmentioning

confidence: 99%

Modulation of the Internal Electric Field in Te-Doped Bi₂MoO₆ Nanosheets: Implication for the Photocatalytic Degradation of Rhodamine B and Photooxidation of Benzylamine

Waehayee,

Wangngae,

Rungruengkit

et al. 2024

ACS Appl. Nano Mater.

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Despite its considerable potential to address energy and environmental challenges, the practical application of photocatalysis is restricted by the limited efficiency of the photocatalysts. This research aims to improve the photocatalytic efficiency of Bi 2 MoO 6 by adjusting the internal electric field within the crystal lattice via Te doping. Te-Bi 2 MoO 6 nanosheets were prepared by a one-step hydrothermal method. Although the band gap energy and the long-range crystal structure are not affected upon doping, Te substitution provides several benefits to the performance of Bi 2 MoO 6 . First, the introduction of Te significantly reduces the thickness of the nanosheets, resulting in a larger surface area. Te states are also introduced into the conduction band, thereby increasing the carrier mobility. More importantly, the reduced cell parameters upon doping and the presence of Te in the lattice not only increase the potential difference between Bi−O and Mo(Te)−O layers in the lattice but also create an asymmetric potential difference. As a result, an internal electric field is enlarged, leading to increased carrier separation. Consequently, 5.0 mol % Tedoped Bi 2 MoO 6 could degrade 99.7% of Rhodamine B in 1 h under visible light, with 6.4 times higher rate constant than pristine Bi 2 MoO 6 . Additionally, the doped sample also exhibits about two times enhancement in benzylamine photooxidation (85% conversion vs 39% conversion) while maintaining excellent stability. Thus, this research highlights the efficacy of modulating the internal electric field through chemical modification as a viable strategy for enhancing the performance of photocatalysts.

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“…Also, the polarization intensity can be enhanced through poling treatment, thus providing a more efficient, long-lasting charge separation effect. Hui et al 33 synthesized Bi 2 MoO 6 nanosheets with superior photocatalytic efficiency toward RhB degradation, and was further enhanced by corona poling treatment. 33 Park et al 34 realized H 2 evolution through KNN, and found out that polarized KNN can reach 7.4 times the original catalytic efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Hui et al 33 synthesized Bi 2 MoO 6 nanosheets with superior photocatalytic efficiency toward RhB degradation, and was further enhanced by corona poling treatment. 33 Park et al 34 realized H 2 evolution through KNN, and found out that polarized KNN can reach 7.4 times the original catalytic efficiency. 34 These works have proven that polarization can evidently enhance the photocatalytic efficiency of ferroelectrics, and is a promising strategy in future catalyst design.…”

Section: Introductionmentioning

confidence: 99%

Controllable hierarchical Bi₂MoO₆ spheres with ferroelectric polarization enhanced photocatalytic efficiency

Hui,

Zhou,

Dai

et al. 2024

J Am Ceram Soc.

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The fast recombination of photogenerated electrons and holes remains a major issue in hindering photocatalytic efficiency. Apart from traditional methods, such as rare metal deposition and element doping, the introduction of a built‐in electric field has been proven an efficient way in recent years. Ferroelectrics, which possess spontaneous polarization and associated polarization electric fields, are attracting more attention as photocatalysts. In this study, Bi2MoO6 spheres with different hierarchical upper nanostructures are synthesized through a one‐pot hydrothermal method. With this porous structure and the intrinsic ferroelectricity, BMO spheres present excellent physisorption and photodegradation ability toward dye molecules. After corona poling treatment, the ferroelectric field of the BMO samples was enhanced, and the recombination of charges was suppressed, leading to an obvious increase in photocatalytic rate. The origin BMO‐5 can reach a total degradation of RhB in 20 min, and the polarized BMO‐5 (BMO‐5P) can remove all RhB molecules instantly through the physisorption process. Apart from BMO‐5, other samples also present excellent catalytic behavior. Origin BMO‐2 can fully degrade the RhB in 40 min, and the degradation time of polarized BMO‐2P is 30 min. The hierarchical structure and internal polarized electric field endow BMO spheres with outstanding adsorption purification and photodegradation ability and provide a new comprehensive strategy for the catalyst design.

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Ferroelectric-assisted charge carrier separation over Bi₂MoO₆ nanosheets for photocatalytic dye degradation

Abstract: Low energy conversion efficiency from absorbed photon to catalytic species remains the major obstacle for real application of photocatalysis. In recent years, the introduction of built-in electric field is proved...

Cited by 11 publications

References 35 publications

Constructing a Titanium Silicon Molecular Sieve-Based Z-Scheme Heterojunction with Enhanced Photocatalytic Activity

Constructing a Titanium Silicon Molecular Sieve-Based Z-Scheme Heterojunction with Enhanced Photocatalytic Activity

Modulation of the Internal Electric Field in Te-Doped Bi₂MoO₆ Nanosheets: Implication for the Photocatalytic Degradation of Rhodamine B and Photooxidation of Benzylamine

Controllable hierarchical Bi₂MoO₆ spheres with ferroelectric polarization enhanced photocatalytic efficiency

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Ferroelectric-assisted charge carrier separation over Bi2MoO6 nanosheets for photocatalytic dye degradation

Abstract: Low energy conversion efficiency from absorbed photon to catalytic species remains the major obstacle for real application of photocatalysis. In recent years, the introduction of built-in electric field is proved...

Cited by 11 publications

References 35 publications

Constructing a Titanium Silicon Molecular Sieve-Based Z-Scheme Heterojunction with Enhanced Photocatalytic Activity

Constructing a Titanium Silicon Molecular Sieve-Based Z-Scheme Heterojunction with Enhanced Photocatalytic Activity

Modulation of the Internal Electric Field in Te-Doped Bi2MoO6 Nanosheets: Implication for the Photocatalytic Degradation of Rhodamine B and Photooxidation of Benzylamine

Controllable hierarchical Bi2MoO6 spheres with ferroelectric polarization enhanced photocatalytic efficiency

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Ferroelectric-assisted charge carrier separation over Bi₂MoO₆ nanosheets for photocatalytic dye degradation

Modulation of the Internal Electric Field in Te-Doped Bi₂MoO₆ Nanosheets: Implication for the Photocatalytic Degradation of Rhodamine B and Photooxidation of Benzylamine

Controllable hierarchical Bi₂MoO₆ spheres with ferroelectric polarization enhanced photocatalytic efficiency