Limits...
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) The schematic illustration of DSSC mechanism associated with a dye (N719) sensitized Bi24O31Cl10 photoanode. (b) Current density-voltage (J-V) characteristics and (c) IPCE spectrum of a DSSC with N719-sensitized Bi24O31Cl10 photoanode under solar light illumination compared with that of a DSSC with Bi24O31Br10 photoanode.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4260216&req=5

f5: (a) The schematic illustration of DSSC mechanism associated with a dye (N719) sensitized Bi24O31Cl10 photoanode. (b) Current density-voltage (J-V) characteristics and (c) IPCE spectrum of a DSSC with N719-sensitized Bi24O31Cl10 photoanode under solar light illumination compared with that of a DSSC with Bi24O31Br10 photoanode.

Mentions: Due to its excellent photosensitive activity, Bi24O31Cl10 is expected to be a candidate photoanode material in DSSCs. Indeed, Bi24O31Cl10 has a proper energy level that matches the N719 (Supplementary Figure S8), which is a common dye-sensitizer in DSSCs50. The photovoltaic properties of a DSSC with Bi24O31Cl10 as the photoelectrode were investigated. In order to identify the effects of dye photosensitivity, we also assessed a DSSC device with Bi24O31Br10. Our previous results9 show that Bi24O31Br10 material has the same crystal structure and particle morphology as those of Bi24O31Cl10 and it also show high photocatalytic activity towards RhB degradation. Most importantly, the degradation of RhB by Bi24O31Br10 is a hole oxidation process rather than a dye-sensitized process which is different with that of Bi24O31Cl10. Figure 5(a) shows the schematic diagram of DSSC mechanism associated with a dye (N719) sensitized Bi24O31Cl10 photoanode. The photocurrent density-voltage (J-V) curves of Bi24O31Cl10 and Bi24O31Br10 based DSSCs are shown in Figure 5(b). It can be found that the overall energy conversion efficiency (η) and the short-circuit photocurrent density (Jsc) of Bi24O31Cl10 were much higher than those of Bi24O31Br10. Incident photon-to-electron conversion efficiency (IPCE) is defined as the number of electrons collected per incident photon. The IPCE spectra (Figure 5(b)) for dye-sensitized solar cell show both materials electrons can be excited by light in range of 300–470 nm. The range of performance is mainly ascribed to ordinary band-gap photoexcitation and devices made with Bi24O31Cl10 possess the same marginal peak IPCE values with that of Bi24O31Br10 devices. The higher IPCE value of Bi24O31Cl10 compared to Bi24O31Br10 away from the dye peak absorbance wavelength (about 540 nm, as marked with ‘*' in the figure) can be attributed to its excellent dye-sensitized capacity37. The efficiencies of DSSCs with Bi24O31Cl10 photoanodes are significantly higher than those reported for other DSSCs with BiOX (Cl, Br, I) materials as photoanodes5152.


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) The schematic illustration of DSSC mechanism associated with a dye (N719) sensitized Bi24O31Cl10 photoanode. (b) Current density-voltage (J-V) characteristics and (c) IPCE spectrum of a DSSC with N719-sensitized Bi24O31Cl10 photoanode under solar light illumination compared with that of a DSSC with Bi24O31Br10 photoanode.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f5: (a) The schematic illustration of DSSC mechanism associated with a dye (N719) sensitized Bi24O31Cl10 photoanode. (b) Current density-voltage (J-V) characteristics and (c) IPCE spectrum of a DSSC with N719-sensitized Bi24O31Cl10 photoanode under solar light illumination compared with that of a DSSC with Bi24O31Br10 photoanode.
Mentions: Due to its excellent photosensitive activity, Bi24O31Cl10 is expected to be a candidate photoanode material in DSSCs. Indeed, Bi24O31Cl10 has a proper energy level that matches the N719 (Supplementary Figure S8), which is a common dye-sensitizer in DSSCs50. The photovoltaic properties of a DSSC with Bi24O31Cl10 as the photoelectrode were investigated. In order to identify the effects of dye photosensitivity, we also assessed a DSSC device with Bi24O31Br10. Our previous results9 show that Bi24O31Br10 material has the same crystal structure and particle morphology as those of Bi24O31Cl10 and it also show high photocatalytic activity towards RhB degradation. Most importantly, the degradation of RhB by Bi24O31Br10 is a hole oxidation process rather than a dye-sensitized process which is different with that of Bi24O31Cl10. Figure 5(a) shows the schematic diagram of DSSC mechanism associated with a dye (N719) sensitized Bi24O31Cl10 photoanode. The photocurrent density-voltage (J-V) curves of Bi24O31Cl10 and Bi24O31Br10 based DSSCs are shown in Figure 5(b). It can be found that the overall energy conversion efficiency (η) and the short-circuit photocurrent density (Jsc) of Bi24O31Cl10 were much higher than those of Bi24O31Br10. Incident photon-to-electron conversion efficiency (IPCE) is defined as the number of electrons collected per incident photon. The IPCE spectra (Figure 5(b)) for dye-sensitized solar cell show both materials electrons can be excited by light in range of 300–470 nm. The range of performance is mainly ascribed to ordinary band-gap photoexcitation and devices made with Bi24O31Cl10 possess the same marginal peak IPCE values with that of Bi24O31Br10 devices. The higher IPCE value of Bi24O31Cl10 compared to Bi24O31Br10 away from the dye peak absorbance wavelength (about 540 nm, as marked with ‘*' in the figure) can be attributed to its excellent dye-sensitized capacity37. The efficiencies of DSSCs with Bi24O31Cl10 photoanodes are significantly higher than those reported for other DSSCs with BiOX (Cl, Br, I) materials as photoanodes5152.

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.