TiO2-X mesoporous nanospheres/BiOI nanosheets S-scheme heterostructure for high efficiency, stable and unbiased photocatalytic hydrogen production

Zhang, Bingke; Wang, Dongbo; Jiao, Shujie; Xu, Zhikun; Liu, Yaxin; Zhao, Chenchen; Pan, Jingwen; Liu, Donghao; Liu, Gang; Jiang, Baojiang; Li, Yongfeng; Zhao, Liancheng; Wang, Jinzhong

doi:10.1016/j.cej.2022.137138

Cited by 23 publications

(14 citation statements)

References 69 publications

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“…Furthermore, there is a partial overlap of Bi 4d 3/2 at 466.1 eV with Ti 2p 1/2 compared with pure TiO 2−X , demonstrating that the semiconductors are bonded by chemical bonds rather than simple van der Waals bond. 20 As shown in Figure 2e, three significant peaks are observed at the peak of C 1s binding energies of 284.8, 286.7, and 288.5 eV, which can be assigned to the C−O, C�O, and O−C�O bonds, respectively. 51 The above XPS analysis shows that the composites of BiOI NS, TiO 2−X MS, and GO are stably synthesized by chemical bonding rather than van der Waals forces, implying the formation of the TB@G ternary heterojunction.…”

Section: Resultsmentioning

confidence: 92%

“…The relative positions of the obtained Fermi energy levels are similar to those derived from theoretical calculations in previous reports. 20 Through the XPS test of the valence band in Figure 4d, the energy difference between the top of the valence band and the Fermi level of the BiOI and TiO 2−X semiconductors at the low binding energy range was determined to be 1.12 and 2.27 eV, respectively. Therefore, the positions of valence band (E VB ) edge positions for BiOI, and TiO 2−X are equal to 1.42 and 2.17 eV vs NHE, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Efficient Doping Induced by Charge Transfer at the Hetero-Interface to Enhance Photocatalytic Performance

Zhang

Wang

Cao

et al. 2023

ACS Appl. Mater. Interfaces

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The construction of heterojunction photocatalysts is an effective method to improve photocatalytic efficiency since the potential gradient and built-in electron field established at the junction could enhance the efficiency of charge separation and interfacial charge transfer. Nevertheless, heterojunction photocatalysts with strong built-in electron fields remain difficult to build since the two adjacent constitutes must be satisfied with an appropriate band alignment, redox potential, and carrier concentration gradient. Here, an efficient charge transfer-induced doping strategy is proposed to enhance the heterojunction built-in electron field for stable and efficient photocatalytic performance. Carrier transfer tests show that the rectification ratio of the n-TiO2–X /n-BiOI heterojunction is significantly enhanced after being coated with graphene oxide (GO). Consequently, both the hydrogen production and photodegradation performance of the GO composite heterojunction are considerably enhanced compared with pure TiO2–X , BiOI, and n-TiO2–X /n-BiOI. This work provides a facile method to prepare heterojunction photocatalysts with a high catalytic activity.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Efficient Doping Induced by Charge Transfer at the Hetero-Interface to Enhance Photocatalytic Performance

Zhang

Wang

Cao

et al. 2023

ACS Appl. Mater. Interfaces

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“…To confirm the discussion above, Figure 6 b shows the PL spectra samples in the visible region. The emission band in the region of 450–600 nm in all PL spectra can be attributed to oxygen-defect-related deep-level emission [ 30 , 31 , 32 , 33 ]. It can be seen that the intensity of the oxygen-defect-related emission peak decreases gradually with the increase in the oxygen flow rate.…”

Section: Resultsmentioning

confidence: 99%

Influence of O2 Flow Rate on the Properties of Ga2O3 Growth by RF Magnetron Sputtering

Sun

Liu

et al. 2023

Micromachines

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The influence of the O2 flow rate on the properties of gallium oxide (Ga2O3) by RF magnetron sputtering was studied. X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), transmittance spectra, and photoluminescence (PL) spectra have been employed to study the Ga2O3 thin films. With the increase in oxygen flow rate, both the crystal quality and luminescence intensity of the Ga2O3 samples first decrease and then enhance. All these observations suggested that the reduction in the oxygen defect density is responsible for the improvement in the crystal quality and emission intensity of the material. Our results demonstrated that high-quality Ga2O3 materials could be obtained by adjusting the oxygen flow rate.

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“…In the literature, it is found that the TiO 2 /BiOI p-n heterojunction can really improve the photocatalytic activity in the visible light wavelength range compared with the single BiOX and TiO 2 phase [ 22 , 23 , 24 ]. Zhang et al [ 25 ] synthesized TiO 2-X /BiOI heterojunction by a simple hydrothermal synthesis method, its photocatalytic ability was characterized by the rate of H 2 production to verify the utilization of light, which is higher than that produced by original material.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Photocatalytic Performance by Building Multiple Heterojunction Structures of Anatase–Rutile/BiOI Composite Fibers

Li¹,

Xu²,

Zhang³

2022

Nanomaterials

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In this study, multiple heterojunction structures of anatase–rutile/Bismuth oxyiodide (BiOI) composite fibers are designed by the combined method of electrospinning and hydrothermal techniques. The influence of different Ti/Bi atomic ratios ([Ti/Bi]) on the nanostructures and photocatalytic properties are investigated. It is found that the morphology of BiOI covered on the TiO2 fiber surface changed with [Ti/Bi] from nanosheets to submicron spheres structures. Additionally, the crystallization of the composite fibers including the phases of anatase, rutile, and BiOI is identified, theses phases are in close contact with each other, and the interfacial effects are helpful to form the multiple heterojunctions which lead to blue shifts on the chemical state of Ti. The absorption of visible light has been improved by compositing BiOI on TiO2, while the band gap values of the composite fibers are significantly reduced, which can enhance the generation and separation of electrons and holes. For the case of [Ti/Bi] = 1.57, the photodegradation rate of anatase–rutile/BiOI composite fibers is about 12 times that of pure TiO2. For the photocatalytic mechanism, the synergistic s-type heterojunctions increase the content of active oxides which have a positive effect on the degradation rate.

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TiO2-X mesoporous nanospheres/BiOI nanosheets S-scheme heterostructure for high efficiency, stable and unbiased photocatalytic hydrogen production

Cited by 23 publications

References 69 publications

Efficient Doping Induced by Charge Transfer at the Hetero-Interface to Enhance Photocatalytic Performance

Efficient Doping Induced by Charge Transfer at the Hetero-Interface to Enhance Photocatalytic Performance

Influence of O2 Flow Rate on the Properties of Ga2O3 Growth by RF Magnetron Sputtering

Improvement of Photocatalytic Performance by Building Multiple Heterojunction Structures of Anatase–Rutile/BiOI Composite Fibers

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