Synthesis of bismuth vanadate nanoplates with exposed {001} facets and enhanced visible-light photocatalytic properties

Xi, Guangcheng; Ye, Jinhua

doi:10.1039/b923435g

Cited by 507 publications

(372 citation statements)

References 28 publications

(4 reference statements)

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“…4 as a model photocatalyst. BiVO 4 , as a visiblelight-responsive photocatalyst, has attracted increasing attention in photocatalytic 15,[40][41][42] and photoelectrochemical [43][44][45] water oxidation. In addition, the BiVO 4 with large crystal size and controllable exposed facets can be easily prepared.…”

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confidence: 99%

Spatial separation of photogenerated electrons and holes among {010} and {110} crystal facets of BiVO4

et al. 2013

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Charge separation is crucial for increasing the activity of semiconductor-based photocatalysts, especially in water splitting reactions. Here we show, using monoclinic bismuth vanadate crystal as a model photocatalyst, that efficient charge separation can be achieved on different crystal facets, as evidenced by the reduction reaction with photogenerated electrons and oxidation reaction with photogenerated holes, which take place separately on the {010} and {110} facets under photo-irradiation. Based on this finding, the reduction and oxidation cocatalysts are selectively deposited on the {010} and {110} facets respectively, resulting in much higher activity in both photocatalytic and photoelectrocatalytic water oxidation reactions, compared with the photocatalyst with randomly distributed cocatalysts. These results show that the photogenrated electrons and holes can be separated between the different facets of semiconductor crystals. This finding may be useful in semiconductor physics and chemistry to construct highly efficient solar energy conversion systems.

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Spatial separation of photogenerated electrons and holes among {010} and {110} crystal facets of BiVO4

et al. 2013

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“…9 This result attracted many researchers to mainly work on the monoclinic phase of bismuth vanadate to better understand the photocatalytic trend of this material. 7,8 The photocatalytic nature of BiVO 4 is not only dependent on the crystalline phases but also on the morphology controlled by different synthesis methods [10][11][12] and on the atomic arrangement designed by proper doping techniques. 13 Doping by introducing an extrinsic defect through the addition of a transition-metal cation or an anion can increase the carrier density and thus improve the conductivity for optimum photocatalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Intrinsic Defect at the Origin of Poor H₂ Evolution Performance of the Monoclinic BiVO₄ Photocatalyst Using Density Functional Theory

2018

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The effects of intrinsic defects in monoclinic bismuth vanadate (BiVO 4 ) on its stability and optoelectronic properties for photochemical water splitting application were examined using density functional theory (DFT). Among the most favorable structures, only that associated with V-antisites on Bi with additional Bi-vacancies (Bi (1-5x) V (1+3x) O 4 with x = 0.0625) revealed narrower band gap energy by 0.5 eV compared to pristine material (calculated value is 2.8 eV) giving a value of 2.3 eV, which is very close to the experimentally reported ones (in the 2.4-2.5 eV range). The low electron mobility reported experimentally for this material was also confirmed by the relatively large electron effective masses obtained for the intrinsic defective Bi (1-5x) V (1+3x) O 4 (x = 0.0625) structure along the three principal crystallographic directions. The strongly localized nature of the accommodated electrons on the d-orbitals of the newly

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“…Generally, it is believed that clinobisvanite monoclinic BiVO 4 exists in (001) orientation so, that is why the (001) slab is opted for the theoretical simulations to represent its experimental thin film [27]. Moreover, the unreconstructed (001) termination possesses low surface energy and as a result represents the most probable surface termination [27]. Stability of these different slabs are confirmed from their positive formation energy and electrostatic potential; details of surface formation energy is give in Table S1 and Fig.…”

Section: Computational Methodologymentioning

confidence: 99%

Structural and electronic properties of oxygen defective and Se-doped p-type BiVO4(001) thin film for the applications of photocatalysis

Ullah

Tahir

Mallick

2018

Applied Catalysis B: Environmental

111

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Monoclinic BiVO 4 is being used as a photocatalyst due to its stability, cost-effectiveness, ease of synthesis, and narrow band gap. Although, the valence band maximum, VBM (∼−6.80 eV vs vacuum) of BiVO 4 is well below the redox potential of water but having less positive conduction band minimum, CBM (−4.56 eV vs vacuum), responsible for its low efficiency. We have carried out a comprehensive periodic density functional theory (DFT) simulations for the pristine, Oxygen defective (O v ) and Se doped BiVO 4 , to engineer not only its CB edge position but the overall photocatalytic and charge carrier properties. Our theoretical method has nicely reproduced the experimental data of pristine BiVO 4 , which encouraged us to elaborate further its O v and Se-doped characteristics. It is found that both the O v (1% Oxygen vacancy) and Se-doped BiVO 4 (1-2% Se) have ideal band edges, band gaps, and small effective masses of electrons and holes, responsible for high photocatalytic activities. Moreover, Se-doped BiVO 4 behave as p-type semiconductor. Finally, the photocatalytic water-splitting behaviour of the selected surfaces were counterchecked with water interaction, where the strong water adsorption energy of about ∼−38 to −50 kcal/mol, confirms and predicts their higher efficiencies compared to that of parent BiVO 4 .

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Synthesis of bismuth vanadate nanoplates with exposed {001} facets and enhanced visible-light photocatalytic properties

Cited by 507 publications

References 28 publications

Spatial separation of photogenerated electrons and holes among {010} and {110} crystal facets of BiVO4

Spatial separation of photogenerated electrons and holes among {010} and {110} crystal facets of BiVO4

Determination of the Intrinsic Defect at the Origin of Poor H₂ Evolution Performance of the Monoclinic BiVO₄ Photocatalyst Using Density Functional Theory

Structural and electronic properties of oxygen defective and Se-doped p-type BiVO4(001) thin film for the applications of photocatalysis

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Synthesis of bismuth vanadate nanoplates with exposed {001} facets and enhanced visible-light photocatalytic properties

Cited by 507 publications

References 28 publications

Spatial separation of photogenerated electrons and holes among {010} and {110} crystal facets of BiVO4

Spatial separation of photogenerated electrons and holes among {010} and {110} crystal facets of BiVO4

Determination of the Intrinsic Defect at the Origin of Poor H2 Evolution Performance of the Monoclinic BiVO4 Photocatalyst Using Density Functional Theory

Structural and electronic properties of oxygen defective and Se-doped p-type BiVO4(001) thin film for the applications of photocatalysis

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Determination of the Intrinsic Defect at the Origin of Poor H₂ Evolution Performance of the Monoclinic BiVO₄ Photocatalyst Using Density Functional Theory