Preparation of flower-like BiOBr–WO 3 –Bi 2 WO 6 ternary hybrid with enhanced visible-light photocatalytic activity

Zhu, Zhiliang; Yan, Ying; Li, Junqi

doi:10.1016/j.jallcom.2015.08.137

Cited by 51 publications

(11 citation statements)

References 46 publications

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“…Meanwhile, the crystal lattice spacing of 0.16 nm are shown in Fig. 5d, which matches well with the (220) plane of B-CoO [34], and the crystal lattice spacings of 0.26 and 0.36 nm originate from the (202) and (200) plane of WO 3 , respectively [39,40]. The above results demonstrate that the heterojunctions are successfully constructed between WO 3 and R-CoO (or B-CoO).…”

Section: Structure and Morphology Of Synthesized Electrodessupporting

confidence: 71%

Enhanced photoelectrochemical water oxidation of WO3/R-CoO and WO3/B-CoO photoanodes with a type II heterojunction

2021

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Tungsten trioxide (WO 3 ) has been conceived as a promising photoanode material for photoelectrochemical (PEC) water oxidation. Therefore, many efforts have been made to improve its PEC performances. Herein, a novel heterojunction is fabricated through combining rocksalt CoO (R-CoO) or blende CoO (B-CoO) nanosheets with WO 3 nanoplates using a spin-coating method. The typical type II heterojunctions, e.g., WO 3 /R-CoO and WO 3 /B-CoO, both have exhibited higher photocurrent densities than pristine WO 3 photoanode. The photocurrent densities of WO 3 /R-CoO, WO 3 /B-CoO and WO 3 are 0.53 mA cm -2 , 0.45 mA cm -2 and 0.31 mA cm -2 at 1.23 V vs. reversible hydrogen electrode, respectively. For the WO 3 /R-CoO photoanode, the surface charge separation efficiency is 50.95% and the photoconversion efficiency is 0.062%, which are both higher than the WO 3 and WO 3 /B-CoO photoanodes. The enhanced PEC performances are due to the type II heterojunction between WO 3 and R-CoO (or B-CoO), which facilitates the absorption of visible light and charge transport. The better performance of WO 3 /R-CoO than that of WO 3 /B-CoO may be due to the deeper valence band position of R-CoO. Our work demonstrates that R-CoO (or B-CoO) can couple with WO 3 to form a type II heterojunction to improve the PEC water oxidation performance.

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Section: Structure and Morphology Of Synthesized Electrodessupporting

confidence: 71%

Enhanced photoelectrochemical water oxidation of WO3/R-CoO and WO3/B-CoO photoanodes with a type II heterojunction

2021

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“…On the other hand, metal oxide semiconductors typically have high chemical stability, while the bandgap energies of metal oxides are commonly higher than those of sulfides because the O (2p) orbital exhibits a lower energy than the S (2p) orbital. Among the metal oxides, Bi 2 WO 6 has received extensive attention due to its moderate bandgap (2.7–2.8 eV) (Figure S3), chemical stability and non-toxicity [28,29,30,31]. However, Bi 2 WO 6 suffers from an unsatisfactory photo-response range and rapid recombination of the photogenerated carriers.…”

Section: Introductionmentioning

confidence: 99%

Carbon Dots-Decorated Bi2WO6 in an Inverse Opal Film as a Photoanode for Photoelectrochemical Solar Energy Conversion under Visible-Light Irradiation

Luo

Qiu²,

Liu

et al. 2019

Materials

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This work focuses on the crystal size dependence of photoactive materials and light absorption enhancement of the addition of carbon dots (CDs). mac-FTO (macroporous fluorine-doped tin oxide) films with an inverse opal structure are exploited to supply enhanced load sites and to induce morphology control for the embedded photoactive materials. The Bi2WO6@mac-FTO photoelectrode is prepared directly inside a mac-FTO film using a simple in situ synthesis method, and the application of CDs to the Bi2WO6@mac-FTO is achieved through an impregnation assembly for the manipulation of light absorption. The surface morphology, chemical composition, light absorption characteristics and photocurrent density of the photoelectrode are analyzed in detail by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), UV–vis diffuse reflectance spectra (DRS), Energy dispersive X-ray analysis (EDX) and linear sweep voltammetry (LSV).

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“…The key parameter that influence the improvement of the photocatalytic activity toward air pollutant degradation is morphology control. According to the literature, it was found that the flower-like three-dimensional (3D) structure photocatalysts possesses (i) a larger surface area and (ii) plenty of mesopores with ordered open-pore frameworks, into which photocatalysts may effectively harvest visible light due to multiple scattering [ 61 , 62 ]. Moreover, the large surface of the flower-like structure could decrease the recombination efficiency of the photoexcited carries and favor their transfer to the surface to react with organic pollutants.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Visible Light Active WO3 Thin Films Toward Air Purification: Effect of the Synthesis Conditions

et al. 2020

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Taking our current environmental situation in the world into consideration, people should face growing problems of air and water pollution. Heterogeneous photocatalysis is a highly promising tool to improve both air and water quality through decomposition/mineralization of contaminants directly into harmless CO2 and H2O under ambient conditions. In this contribution, we focused on the synthesis of self-assembly WO3 thin films via an electrochemical approach in the aqueous electrolyte containing fluoride ions toward air purification. The effect of preparation conditions such as applied potential (10–50 V), anodization time (15–120 min), concentration of H2SO4 (0.5–1.5 M) and NaF (0.1–1.0 wt.%) on the morphology, photocurrent response, and photocatalytic activity addressed to removal of air pollutant in the presence of as-prepared WO3 samples were thoroughly examined and presented. The results revealed the growth of nanoplatelets and their gradual transformation into flower-like structures. The oxide layers and platelet thickness of the WO3 samples were found to be proportionally related with the synthesis conditions. The photocatalytic ability toward air purification was evaluated by degradation of toluene from air mixture using low-powered LEDs as an irradiation source (λmax = 415 nm). The highest photoactivity was achieved in presence of the sample which possessed a well-ordered, regular shape and repeatable distribution of flower buds (100% of degradation). The results have confirmed that the oxide layer thickness of the anodic WO3 significantly affected the photocatalytic activity, which increased with the increasing thickness of WO3 (to 1.05 μm) and then had a downward trend. The photocurrent response evidenced that the well-organized sample had the highest ability in photocurrent generation under UV-Vis and Vis irradiation. Finally, a possible growth mechanism of WO3 NFs was also discussed.

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Preparation of flower-like BiOBr–WO 3 –Bi 2 WO 6 ternary hybrid with enhanced visible-light photocatalytic activity

Cited by 51 publications

References 46 publications

Enhanced photoelectrochemical water oxidation of WO3/R-CoO and WO3/B-CoO photoanodes with a type II heterojunction

Enhanced photoelectrochemical water oxidation of WO3/R-CoO and WO3/B-CoO photoanodes with a type II heterojunction

Carbon Dots-Decorated Bi2WO6 in an Inverse Opal Film as a Photoanode for Photoelectrochemical Solar Energy Conversion under Visible-Light Irradiation

Enhanced Visible Light Active WO3 Thin Films Toward Air Purification: Effect of the Synthesis Conditions

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