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A dye-sensitized visible light photocatalyst-Bi24O31Cl10.

Wang L, Shang J, Hao W, Jiang S, Huang S, Wang T, Sun Z, Du Y, Dou S, Xie T, Wang D, Wang J - Sci Rep (2014)

Bottom Line: Density functional theory calculations reveal that the p-block elements determine the nature of the dispersive electronic structures and narrow band gap in Bi24O31Cl10.Bi24O31Cl10 exhibits excellent visible-light photocatalytic activity towards the degradation of Rhodamine B, which is promoted by dye sensitization due to compatible energy levels and high electronic mobility.In addition, Bi24O31Cl10 is also a suitable photoanode material for dye-sensitized solar cells and shows power conversion efficiency of 1.5%.

View Article: PubMed Central - PubMed

Affiliation: Center of Materials Physics and Chemistry and Department of Physics, Beihang University, Beijing 100191, P. R. China.

ABSTRACT
The p-block semiconductors are regarded as a new family of visible-light photocatalysts because of their dispersive and anisotropic band structures as well as high chemical stability. The bismuth oxide halides belong to this family and have band structures and dispersion relations that can be engineered by modulating the stoichiometry of the halogen elements. Herein, we have developed a new visible-light photocatalyst Bi24O31Cl10 by band engineering, which shows high dye-sensitized photocatalytic activity. Density functional theory calculations reveal that the p-block elements determine the nature of the dispersive electronic structures and narrow band gap in Bi24O31Cl10. Bi24O31Cl10 exhibits excellent visible-light photocatalytic activity towards the degradation of Rhodamine B, which is promoted by dye sensitization due to compatible energy levels and high electronic mobility. In addition, Bi24O31Cl10 is also a suitable photoanode material for dye-sensitized solar cells and shows power conversion efficiency of 1.5%.

No MeSH data available.


(a) XRD patterns of Bi24O31Cl10 samples calcined at different temperatures. (b) SEM images of plate-like Bi24O31Cl10 calcined at 500, 600, 700 and 800°C. The scale bars represent 0.5 μm for (a) and (b), and 2 μm and 10 μm for (c) and (d), respectively.
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f2: (a) XRD patterns of Bi24O31Cl10 samples calcined at different temperatures. (b) SEM images of plate-like Bi24O31Cl10 calcined at 500, 600, 700 and 800°C. The scale bars represent 0.5 μm for (a) and (b), and 2 μm and 10 μm for (c) and (d), respectively.

Mentions: Figure 2(a) and (b) shows typical X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) images of as-prepared Bi24O31Cl10 samples. It reveals plate-like particles in sizes of several hundred nanometers and thicknesses of 50–100 nm. The post-annealing process is found to be critical for the morphology and the size of Bi24O31Cl10 particles. The particles become significantly larger and agglomerate as the annealing temperature is increased above 700°C, which potentially suppresses photocatalytic performance (See Supporting Information). In this work, all the results are obtained from the Bi24O31Cl10 sample annealed at 600°C. X-ray photoelectron spectroscopy (XPS) results for Bi24O31Cl10 are shown in Supplementary Figure S2(a), in which the peaks for Bi 4f, Bi 5d, O 1s, and Cl 3d orbitals are identified. The Bi peaks correspond to Bi 4f7/2 and Bi 4f5/2, which are located at 158.76 eV and 163.88 eV, respectively (with the splitting energy Δ = 5.12 eV), as shown in Supplementary Figure S2(b), indicating that Bi only presents a valence of +3 in Bi24O31Cl1040.


A dye-sensitized visible light photocatalyst-Bi24O31Cl10.

Wang L, Shang J, Hao W, Jiang S, Huang S, Wang T, Sun Z, Du Y, Dou S, Xie T, Wang D, Wang J - Sci Rep (2014)

(a) XRD patterns of Bi24O31Cl10 samples calcined at different temperatures. (b) SEM images of plate-like Bi24O31Cl10 calcined at 500, 600, 700 and 800°C. The scale bars represent 0.5 μm for (a) and (b), and 2 μm and 10 μm for (c) and (d), respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4260216&req=5

f2: (a) XRD patterns of Bi24O31Cl10 samples calcined at different temperatures. (b) SEM images of plate-like Bi24O31Cl10 calcined at 500, 600, 700 and 800°C. The scale bars represent 0.5 μm for (a) and (b), and 2 μm and 10 μm for (c) and (d), respectively.
Mentions: Figure 2(a) and (b) shows typical X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) images of as-prepared Bi24O31Cl10 samples. It reveals plate-like particles in sizes of several hundred nanometers and thicknesses of 50–100 nm. The post-annealing process is found to be critical for the morphology and the size of Bi24O31Cl10 particles. The particles become significantly larger and agglomerate as the annealing temperature is increased above 700°C, which potentially suppresses photocatalytic performance (See Supporting Information). In this work, all the results are obtained from the Bi24O31Cl10 sample annealed at 600°C. X-ray photoelectron spectroscopy (XPS) results for Bi24O31Cl10 are shown in Supplementary Figure S2(a), in which the peaks for Bi 4f, Bi 5d, O 1s, and Cl 3d orbitals are identified. The Bi peaks correspond to Bi 4f7/2 and Bi 4f5/2, which are located at 158.76 eV and 163.88 eV, respectively (with the splitting energy Δ = 5.12 eV), as shown in Supplementary Figure S2(b), indicating that Bi only presents a valence of +3 in Bi24O31Cl1040.

Bottom Line: Density functional theory calculations reveal that the p-block elements determine the nature of the dispersive electronic structures and narrow band gap in Bi24O31Cl10.Bi24O31Cl10 exhibits excellent visible-light photocatalytic activity towards the degradation of Rhodamine B, which is promoted by dye sensitization due to compatible energy levels and high electronic mobility.In addition, Bi24O31Cl10 is also a suitable photoanode material for dye-sensitized solar cells and shows power conversion efficiency of 1.5%.

View Article: PubMed Central - PubMed

Affiliation: Center of Materials Physics and Chemistry and Department of Physics, Beihang University, Beijing 100191, P. R. China.

ABSTRACT
The p-block semiconductors are regarded as a new family of visible-light photocatalysts because of their dispersive and anisotropic band structures as well as high chemical stability. The bismuth oxide halides belong to this family and have band structures and dispersion relations that can be engineered by modulating the stoichiometry of the halogen elements. Herein, we have developed a new visible-light photocatalyst Bi24O31Cl10 by band engineering, which shows high dye-sensitized photocatalytic activity. Density functional theory calculations reveal that the p-block elements determine the nature of the dispersive electronic structures and narrow band gap in Bi24O31Cl10. Bi24O31Cl10 exhibits excellent visible-light photocatalytic activity towards the degradation of Rhodamine B, which is promoted by dye sensitization due to compatible energy levels and high electronic mobility. In addition, Bi24O31Cl10 is also a suitable photoanode material for dye-sensitized solar cells and shows power conversion efficiency of 1.5%.

No MeSH data available.