Fabrication and photocatalytic activity enhanced mechanism of direct Z-scheme g-C 3 N 4 /Ag 2 WO 4 photocatalyst

Zhu, Bicheng; Xia, Pengfei; Li, Yao; Ho, Wingkei; Wang, Yuanyuan

doi:10.1016/j.apsusc.2016.07.104

Cited by 627 publications

(163 citation statements)

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“…Among the strategies for improving the photocatalytic performance, constructing heterostructures by coupling g‐C 3 N 4 with another semiconductor with suitable band structure is accepted as a promising way to increase the lifetime of photogenerated charge carriers, improve the charge carrier separation efficiency and even enhance light utilization, and thereby promote the photocatalytic performance . Especially, considering the negative conduction band potential (−1.1 V vs. RHE) of g‐C 3 N 4 , the construction of Z‐scheme photocatalysts by coupling g‐C 3 N 4 with a semiconductor with deep valence band (VB) potential can preserve photogenerated charge carriers with strong redox abilities .…”

Section: Introductionmentioning

confidence: 99%

Constructing 2D/2D Fe₂O₃/g‐C₃N₄ Direct Z‐Scheme Photocatalysts with Enhanced H₂ Generation Performance

et al. 2018

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Sunlight‐driven photocatalytic water splitting to generate hydrogen (H2) is a promising approach for utilizing solar energy. Herein, direct Z‐scheme Fe2O3/g‐C3N4 photocatalysts are rationally fabricated for H2 evolution under visible light. The graphitic carbon nitride (g‐C3N4) nanosheets obtained by solvent exfoliation of bulk g‐C3N4 display modest photocatalytic activity. Strikingly, its photocatalytic performance can be greatly improved by electrostatically assembling with hematite α‐Fe2O3 nanoplates. With platinum (Pt) as co‐catalyst and triethanolamine (TEOA) as hole scavenger, the H2 generation rate of optimized Fe2O3/g‐C3N4 composite with Fe2O3 weight percentage of 10% is about 13‐fold that of g‐C3N4. Based on the enhanced photocatalytic performance and slower time‐resolved photoluminescence decay, Z‐scheme charge transfer process is accepted for running this photocatalytic system, which is further evidenced by selective photo‐deposition of Pt nanoparticles on the g‐C3N4 surface. This rationally synthesized Fe2O3/g‐C3N4 composite is expected to have great potentials in solar energy conversation.

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Section: Introductionmentioning

confidence: 99%

Constructing 2D/2D Fe₂O₃/g‐C₃N₄ Direct Z‐Scheme Photocatalysts with Enhanced H₂ Generation Performance

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“…56,57 2.2 | Band structure UV-vis diffuse reflection spectrum shows that the bandgap (E g ) of g-C 3 N 4 is experimentally determined to be 2.7 eV. 58,59 The theoretical E g obtained by DFT calculation is heavily dependent on the constructed model and employed functional. Table 1 summarizes the calculated E g of g-C 3 N 4 in various literatures.…”

Section: Introductionmentioning

confidence: 99%

Review on DFT calculation of s‐triazine‐based carbon nitride

et al. 2019

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To improve the photocatalytic performance of pristine photocatalysts, element doping, construction of composites and fabrication of novel nanostructures are recognized as universal modification methods. These methods have been experimentally verified to be effective in manifold photocatalytic application over various photocatalysts. Density functional theory (DFT) calculation is a powerful and fundamental tool to pinpoint the intrinsic mechanism of the enhanced photocatalytic activity. And it holds the degree of precision ranging from atoms, molecules to unit cells. Herein, recent DFT calculation research progress of modified s-triazine-based graphitic carbon nitride (g-C 3 N 4 ) systems as photocatalysts is summarized. To specify, we collected information of doping site, formation energy, geometric, and electronic properties. We also discussed the synergistic effect of work function, Fermi level and band edge position on the built-in electric field, transfer route of photogenerated charge carriers and photocatalytic mechanism (traditional type Ⅱ or direct Z-scheme heterostructure). Moreover, we analyzed the geometric configuration, band structure, and stability of g-C 3 N 4 nanocluster, nanoribbon, and nanotube. Finally, future perspective in the further theoretical revelation of g-C 3 N 4 -based photocatalysts is proposed.

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“…1. For as-prepared pure g-C 3 N 4 , the curve exhibits a typical XRD pattern of g-C 3 N 4 , which consists of two characteristic peaks around 13.04° of (100) crystal plane, and 27.36° of (002) crystal plane394041, respectively. All the peaks of pattern b match well with the (101), (103), (004), (112), (200), (105) and (211) reflections of anatase-type TiO 2 (PDF No.…”

Section: Resultsmentioning

confidence: 99%

A general nonaqueous sol-gel route to g-C3N4-coupling photocatalysts: the case of Z-scheme g-C3N4/TiO2 with enhanced photodegradation toward RhB under visible-light

Liu

Chen

et al. 2016

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The g-C3N4-coupling TiO2 photocatalysts with controllable particle size as well as the interface contact were prepared by a general nonaqueous sol-gel method. The structural and morphological features of g-C3N4/TiO2 were investigated through the X-ray diffraction, Fourier transformed infrared spectra, scanning electron microscopy and transmission electron microscopy, respectively. It is found the TiO2 nanoparticles with a size of 7.3 ± 1.6 nm are uniformly anchored on the surface of the g-C3N4 nanosheets in isolation. The photocatalytic properties of as-prepared g-C3N4/TiO2 were tested by degradation of Rhodamine B (RhB) under visible light, and an enhanced activity is observed. The mechanism of the enhanced activity was further investigated through N2 adsorption-desorption isotherms, UV-vis spectra, photoluminescence spectra, photoelectrochemical measurements, radical trapping experiments and X-ray photoelectron spectroscopy. Furthermore, the photocatalytic performances of obtained g-C3N4/TiO2 under sunlight were also evaluated in aspects of degradation efficiency and stability. The results indicate that the obtained g-C3N4/TiO2 is one promising photocatalyst for practical applications. The study of as-prepared g-C3N4/TiO2 also implies that the present method could be a general route of g-C3N4-coupling photocatalysts.

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Fabrication and photocatalytic activity enhanced mechanism of direct Z-scheme g-C 3 N 4 /Ag 2 WO 4 photocatalyst

Cited by 627 publications

References 74 publications

Constructing 2D/2D Fe₂O₃/g‐C₃N₄ Direct Z‐Scheme Photocatalysts with Enhanced H₂ Generation Performance

Constructing 2D/2D Fe₂O₃/g‐C₃N₄ Direct Z‐Scheme Photocatalysts with Enhanced H₂ Generation Performance

Review on DFT calculation of s‐triazine‐based carbon nitride

A general nonaqueous sol-gel route to g-C3N4-coupling photocatalysts: the case of Z-scheme g-C3N4/TiO2 with enhanced photodegradation toward RhB under visible-light

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Fabrication and photocatalytic activity enhanced mechanism of direct Z-scheme g-C 3 N 4 /Ag 2 WO 4 photocatalyst

Cited by 627 publications

References 74 publications

Constructing 2D/2D Fe2O3/g‐C3N4 Direct Z‐Scheme Photocatalysts with Enhanced H2 Generation Performance

Constructing 2D/2D Fe2O3/g‐C3N4 Direct Z‐Scheme Photocatalysts with Enhanced H2 Generation Performance

Review on DFT calculation of s‐triazine‐based carbon nitride

A general nonaqueous sol-gel route to g-C3N4-coupling photocatalysts: the case of Z-scheme g-C3N4/TiO2 with enhanced photodegradation toward RhB under visible-light

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Constructing 2D/2D Fe₂O₃/g‐C₃N₄ Direct Z‐Scheme Photocatalysts with Enhanced H₂ Generation Performance

Constructing 2D/2D Fe₂O₃/g‐C₃N₄ Direct Z‐Scheme Photocatalysts with Enhanced H₂ Generation Performance