Facile synthesis of Pt assisted Bi-Bi2WO6−x with oxygen vacancies for the improved photocatalytic activity under visible light

Zhang, Shuoshuo; Pu, Weihua; Du, Hao; Wang, Yunyang; Yang, Changzhu; Gong, Jianyu

doi:10.1016/j.apsusc.2018.07.222

Cited by 33 publications

(8 citation statements)

References 52 publications

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“…Both experi-mental and theoretical works reported that in Bi 2 WO 6 , oxygen vacancies are easily formed and contribute to band gap narrowing. 53,[56][57][58] Similar characteristics are expected for quaternary compounds. Since the experimental measurements of Bi 2 TaO 5 F, Bi 2 NbO 5 F and Bi 2 TiO 4 F 2 were performed for porous structures, abundance of defects are likely to be the reason for the smaller band gaps to be observed.…”

Section: Crystal Structuresupporting

confidence: 56%

Crystal Engineering of Bi2WO6 to Polar Aurivillius-Phase Oxyhalides

Morita

Park²,

Kim³

et al. 2019

Preprint

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The Aurivillius phases of complex bismuth oxides have attracted considerable attention due to their lattice polarization (ferroelectricity) and photocatalytic activity. We report a first-principles exploration of Bi2WO6 and the replacement of W6+ by pentavalent (Nb5+, Ta5+) and tetravalent (Ti4+, Sn4+) ions, with charge neutrality maintained by the formation of a mixed-anion oxyhalide sublattice. We find that Bi2SnO4F2 is thermodynamically unstable, in contrast to Bi2TaO5F, Bi2NbO5F and Bi2TiO4F2. The electric dipoles introduced by chemical substitutions in the parent compound are found to suppress the spontaneous polarization from 61.55 μC/cm2 to below 15.50 μC/cm2. Analysis of the trends in electronic structure, surface structure, and ionization potentials are reported. This family of materials can be further extended with control of layer thicknesses and choice of compensating halide species.

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Section: Crystal Structuresupporting

confidence: 56%

Crystal Engineering of Bi2WO6 to Polar Aurivillius-Phase Oxyhalides

Morita

Park²,

Kim³

et al. 2019

Preprint

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“…The major peaks are located in the 150–400 and 600–900 cm –1 ranges, which are consistent with previous reports. − The peaks in the 600–900 cm –1 range can be attributed to the stretching of the W–O band, while the peak at 315 cm –1 is attributed to a translational pattern involving the simultaneous motion of Bi 3+ and WO 6 6– . A slight shift was observed after depositing Pd due to the change of electron density through the interaction of Pd and Bi 2 WO 6 , and this interaction may be responsible for the significant decrease in the peak intensity of Pd (1%)-Bi 2 WO 6 near 315, 803, and 828 cm –1 …”

Section: Resultssupporting

confidence: 90%

Palladium Nanoparticles Embedded Nutshell-like Bi₂WO₆ as an Efficient and Stable Visible-Light-Responsive Photocatalysts for NO Removal

et al. 2022

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Bi 2 WO 6 is a promising photocatalyst for NO x removal, owing to its wide solar light absorption and specific photoelectric properties. Nevertheless, enhancing its efficiency remains a major concern. Palladium proves to be a good co-catalyst for semiconductor materials, but how the combination of Pd and bismuth tungstate affects the efficiency of NO removal and relevant process is still vague. In this work, nutshell-like bismuth tungstate was synthesized using a hydrothermal method, followed by photodepositing Pd nanoparticles with different contents. The obtained photocatalysts were characterized by X-ray diffraction, specific surface area analyzer (BET), X-ray photoelectron spectroscopy, and scanning electron microscopy. Among the prepared photocatalysts, Bi 2 WO 6 deposited with 1 wt % Pd shows the best photocatalytic activity with a NO removal efficiency of 58%, which is 2.9 times that of the Bi 2 WO 6 under the same conditions. The enhanced photocatalytic activities were attributed to the comprehensive effects of the high efficiency in separating electrons and holes, improvement in invisible light utilization and BET specific surface areas of Pd−Bi 2 WO 6 nanocomposites. More importantly, it was found that NO 2 is the main product over Bi 2 WO 6 , whereas the conversion of NO to NO 3 − (an environmentally friendly product) is dominant over Pd-modified Bi 2 WO 6 due to the enhanced separation of electrons and holes. Active species capture experiments show that photo-generated holes (h + ) and • O 2 − play an important role in NO removal. The present work provides new insights into the role of Pd cocatalysts in NO removal.

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“…In addition to the band gap overestimation arising from the HSE06 functional, the smaller measured band gaps are likely to be influenced by point and extended defects. Both experimental and theoretical works reported that in Bi 2 WO 6 , oxygen vacancies are easily formed and contribute to band gap narrowing. ,− Similar characteristics are expected for quaternary compounds. Because the experimental measurements of Bi 2 TaO 5 F, Bi 2 NbO 5 F, and Bi 2 TiO 4 F 2 were performed for porous structures, abundance of defects are likely to be the reason for the smaller band gaps to be experimentally observed.…”

Section: Resultsmentioning

confidence: 66%

Crystal Engineering of Bi₂WO₆ to Polar Aurivillius-Phase Oxyhalides

et al. 2019

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Crystal Engineering of Bi2WO6 to Polar Aurivillius-Phase Oxyhalides. ChemRxiv. Preprint. The Aurivillius phases of complex bismuth oxides have attracted considerable attention due to their lattice polarization (ferroelectricity) and photocatalytic activity. We report a first-principles exploration of Bi 2 WO 6 and download file view on ChemRxiv manuscript_Aurivillius.pdf (5.84 MiB) download file view on ChemRxiv SI_Aurivillius.pdf (5.34 MiB)

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Facile synthesis of Pt assisted Bi-Bi2WO6−x with oxygen vacancies for the improved photocatalytic activity under visible light

Cited by 33 publications

References 52 publications

Crystal Engineering of Bi2WO6 to Polar Aurivillius-Phase Oxyhalides

Crystal Engineering of Bi2WO6 to Polar Aurivillius-Phase Oxyhalides

Palladium Nanoparticles Embedded Nutshell-like Bi₂WO₆ as an Efficient and Stable Visible-Light-Responsive Photocatalysts for NO Removal

Crystal Engineering of Bi₂WO₆ to Polar Aurivillius-Phase Oxyhalides

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Facile synthesis of Pt assisted Bi-Bi2WO6−x with oxygen vacancies for the improved photocatalytic activity under visible light

Cited by 33 publications

References 52 publications

Crystal Engineering of Bi2WO6 to Polar Aurivillius-Phase Oxyhalides

Crystal Engineering of Bi2WO6 to Polar Aurivillius-Phase Oxyhalides

Palladium Nanoparticles Embedded Nutshell-like Bi2WO6 as an Efficient and Stable Visible-Light-Responsive Photocatalysts for NO Removal

Crystal Engineering of Bi2WO6 to Polar Aurivillius-Phase Oxyhalides

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Product

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About

Palladium Nanoparticles Embedded Nutshell-like Bi₂WO₆ as an Efficient and Stable Visible-Light-Responsive Photocatalysts for NO Removal

Crystal Engineering of Bi₂WO₆ to Polar Aurivillius-Phase Oxyhalides