BiOCl/BiVO<sub>4</sub> p–n Heterojunction with Enhanced Photocatalytic Activity under Visible-Light Irradiation

He, Zhiqiao; Shi, Yuanqiao; Gao, Chao; Wen, Lina; Chen, Jianmeng; Song, Shuang

doi:10.1021/jp409598s

Cited by 407 publications

(209 citation statements)

References 71 publications

(139 reference statements)

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“…[10] BiOCl is notable as a ptype semiconductor; it absorbs only ultraviolet (UV) light because of wide band gap (3.2À3.5 eV) and therefore it does not degrade organic dyes under visible irradiation. [11,12] Hence, it has been combined with metal ions or coupled with other semiconductors which shows high photocatalytic activity towards organic contaminants. Moreover, studies of BiOCl depending on the exposed {001} facets have received much attention to enhance its photocatalytic, photoelectric or surface-related properties.…”

Section: Introductionmentioning

confidence: 99%

Size-controlled BiOCl–RGO composites having enhanced photodegradative properties

Kang

Pawar

Pyo

et al. 2015

Journal of Experimental Nanoscience

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Visible light-active bismuth oxychlorideÀreduced graphene oxide (BiOClÀRGO) composite photocatalysts were synthesised using a hydrothermal method at low temperature, and at a low cost. This approach reduced the recombination of electronÀhole pairs and thereby provided more efficient photocatalysts. The size of BiOCl structure was controlled by polyvinylpyrrolidone (PVP) addition. Furthermore, formation of nanosized BiOCl sheets and BiOClÀRGO composites were confirmed by X-ray diffraction, X-ray photoelectron spectroscopy, fieldemission scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. Fabricated BiOClÀRGO composite with PVP exhibited better photocatalytic activity than pure BiOCl grown with and without PVP towards degradation of Rhodamine B (RhB). It was found that the composite photocatalyst degrades RhB completely within 310 min as compared with several hours for pure BiOCl. The improved photocatalytic performance of BiOClÀRGO composite was attributed to its high specific surface area (22.074 m 2 g ¡1 and existence of polar surfaces, compared with 9.831 m 2 g ¡1 for pure BiOCl). The analyses indicated that RGO helped to reduce recombination losses and improve electron transport. It also showed that presence of polar surfaces improved photocatalytic activity of BiOCl. Hence, BiOClÀRGO composite is a promising catalyst for the degradation of organic pollutants under visible light and could be used in applications such as water purification devices.

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Section: Introductionmentioning

confidence: 99%

Size-controlled BiOCl–RGO composites having enhanced photodegradative properties

Kang

Pawar

Pyo

et al. 2015

Journal of Experimental Nanoscience

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“…5. It is also reported that monoclinic BiVO 4 is normally an intrinsic n-type semiconductor [32]. The contribution of V, Bi, and O orbitals are comparatively given in Fig.…”

Section: Electronic Properties Of Oxygen Vacancy Bivo 4 (001) Surfacementioning

confidence: 85%

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

110

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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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“…A p-n heterojunction was also recently prepared combining p-type BiOCl with n-type BiVO 4 [32]. In a novel type of Z-scheme composite photocatalyst, BiVO 4 was combined with Rh-doped Ru-SrTiO 3 , another visible-light absorbing oxide photocatalyst (Fig.…”

Section: Bivomentioning

confidence: 99%

Heterojunctions in Composite Photocatalysts

Marschall

2015

Topics in Current Chemistry

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Combining different light-absorbing materials for the formation of semiconductor heterojunctions is a very effective strategy for preparing highly active photocatalyst and photoelectrochemical systems. Moreover, the combination of solid state semiconductors with polymers or molecular absorbers expands the possible combinations of materials to alter light absorption and optimize charge carrier separation. In this chapter, different strategies to prepare such composites are presented, highlighting the necessity of intimate interfacial contact for optimum charge carrier transfer. Moreover, the most recent developments and improvements in the formation of heterojunctions and composite photocatalyst systems based on semiconductor solids are presented.

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BiOCl/BiVO₄ p–n Heterojunction with Enhanced Photocatalytic Activity under Visible-Light Irradiation

Cited by 407 publications

References 71 publications

Size-controlled BiOCl–RGO composites having enhanced photodegradative properties

Size-controlled BiOCl–RGO composites having enhanced photodegradative properties

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

Heterojunctions in Composite Photocatalysts

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BiOCl/BiVO4 p–n Heterojunction with Enhanced Photocatalytic Activity under Visible-Light Irradiation

Cited by 407 publications

References 71 publications

Size-controlled BiOCl–RGO composites having enhanced photodegradative properties

Size-controlled BiOCl–RGO composites having enhanced photodegradative properties

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

Heterojunctions in Composite Photocatalysts

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BiOCl/BiVO₄ p–n Heterojunction with Enhanced Photocatalytic Activity under Visible-Light Irradiation