Selective Preparation of Monoclinic and Tetragonal BiVO<sub>4</sub>with Scheelite Structure and Their Photocatalytic Properties

Tokunaga, Saimi; Kato, Hideki; Kudo, Akihiko

doi:10.1021/cm0103390

Cited by 996 publications

(715 citation statements)

References 28 publications

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“…After annealing at [18,19]. Furthermore, results indicated that cobalt doping did not affect the crystal structure of BiVO 4 except only a slight decrease in the height of its major XRD peak at 28.6 • .…”

Section: Xrd Analysis Of Co-bivo 4 Photocatalystsmentioning

confidence: 93%

“…BiVO 4 can exist in three crystalline phases, namely, tetragonal zircon, monoclinic scheelite, and tetragonal scheelite. These three crystal types can undergo phase transition under different thermal conditions [18]. It has been reported that BiVO 4 in the form of monoclinic scheelite shows excellent photocatalytic performance under visible light [18].…”

Section: Introductionmentioning

confidence: 99%

“…These three crystal types can undergo phase transition under different thermal conditions [18]. It has been reported that BiVO 4 in the form of monoclinic scheelite shows excellent photocatalytic performance under visible light [18]. In contrast with tetragonal BiO 4 , which band gap is 2.9 eV, the monoclinic scheelite has a band gap energy of 2.4 eV and can absorb the solar spectrum up to the blue light fraction of ca.…”

Section: Introductionmentioning

confidence: 99%

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Visible-light sensitive cobalt-doped BiVO4 (Co-BiVO4) photocatalytic composites for the degradation of methylene blue dye in dilute aqueous solutions

Zhou

Zhao

Liu

et al. 2010

Applied Catalysis B: Environmental

292

101

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Section: Xrd Analysis Of Co-bivo 4 Photocatalystsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Visible-light sensitive cobalt-doped BiVO4 (Co-BiVO4) photocatalytic composites for the degradation of methylene blue dye in dilute aqueous solutions

Zhou

Zhao

Liu

et al. 2010

Applied Catalysis B: Environmental

292

101

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“…2.4 eV), while the photocatalytic activity of tetragonal BiVO 4 (t-BiVO 4 ) was reported to be negligible. [8][9][10][11] For this reason, different synthetic methods have been recently proposed for obtaining the photoactive monoclinic phase. [12][13][14] A novel challenging composite configuration would consist of the assembly of the photocatalytic material with a luminescence material.…”

Section: Introductionmentioning

confidence: 99%

Exalted photocatalytic activity of tetragonal BiVO₄by Er³⁺doping through a luminescence cooperative mechanism

2014

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Er-doped BiVO 4 are synthesized by means of a surfactant free microwave assisted hydrothermal method having good photoactivities under sun-like excitation for the degradation of methylene blue. From the structural and morphological characterization, it has been stated that the presence of Er 3+ induces a slight stabilization of the tetragonal phase, probably due to its incorporation in the BiVO 4 lattice. The best photocatalytic performances were attained for the samples with Er 3+ content higher than 3 at%. The occurrence of the Er 3+ doped tetragonal BiVO 4 clearly induces higher photocatalytic activities. The existence of a luminescence process has been related with the enhanced photoactivity observed.

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“…Among them, the scheelite monoclinic BiVO 4 shows the highest photocatalytic activity for O 2 evolution from an aqueous AgNO 3 solution under visible light irradiation (19,(34)(35)(36). However, BiVO 4 -powdered photocatalyst is inactive for overall water splitting into H 2 and O 2 , because the bottom of conduction band is more positive than the reduction potential of H 2 O to form H 2 .…”

mentioning

confidence: 99%

Facile fabrication of an efficient BiVO ₄ thin film electrode for water splitting under visible light irradiation

Jia

Iwashina²,

Kudo³

2012

Proc. Natl. Acad. Sci. U.S.A.

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289

186

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An efficient BiVO 4 thin film electrode for overall water splitting was prepared by dipping an F-doped SnO 2 (FTO) substrate electrode in an aqueous nitric acid solution of BiðNO 3 Þ 3 and NH 4 VO 3 , and subsequently calcining it. X-ray diffraction of the BiVO 4 thin film revealed that a photocatalytically active phase of scheelite-monoclinic BiVO 4 was obtained. Scanning electron microscopy images showed that the surface of an FTO substrate was uniformly coated with the BiVO 4 film with 300-400 nm of the thickness. The BiVO 4 thin film electrode gave an excellent anodic photocurrent with 73% of an IPCE at 420 nm at 1.0 V vs. Ag∕AgCl. Modification with CoO on the BiVO 4 electrode improved the photoelectrochemical property. A photoelectrochemical cell consisting of the BiVO 4 thin film electrode with and without CoO, and a Pt counter electrode was constructed for water splitting under visible light irradiation and simulated sunlight irradiation. Photocurrent due to water splitting to form H 2 and O 2 was confirmed with applying an external bias smaller than 1.23 V that is a theoretical voltage for electrolysis of water. Water splitting without applying external bias under visible light irradiation was demonstrated using a SrTiO 3 ∶Rh photocathode and the BiVO 4 photoanode.hydrogen production | solar energy conversion | visible light response T he development of powdered photocatalysts and semiconductor photoelectrodes for water splitting have been studied extensively in view of utilization of solar energy, since the report of the Honda-Fujishima effect (1). There are advantageous and disadvantageous points for water splitting using the powdered photocatalysts and photoelectrochemical cells. Although a powdered photocatalyst system is simple, H 2 and O 2 are produced as a mixture. In contrast to it, photoelectrochemical cells give H 2 separately from O 2 gas. Moreover, even if powdered photocatalysts do not possess band potentials suitable for water splitting (the bottom of the conduction band <0 V and the top of the valence band >1.23 V vs. NHE at pH 0), water splitting may be achieved by application of these powdered photocatalysts to photoelectrodes with applying some external bias. However, the electrical conductivity of semiconductor electrode is indispensable, resulting in that the number of the photoelectrode materials is limited.It has been reported that many metal oxides are active photocatalysts for water splitting into H 2 and O 2 stoichiometrically under UV light irradiation (2). Photoelectrodes, such as TiO 2 (1, 3, 4), SrTiO 3 (5, 6), BaTiO 3 (7), and KTaO 3 (8) have been reported for photoelectrochemical water splitting under UV light irradiation. Development of a photoelectrode material with visible light response has been sought for efficient utilization of solar energy. It has been reported that Fe 2 O 3 (9-11), WO 3 (12-14), BiVO 4 (15-24), and SrTiO 3 ∶Rh (25) of metal oxide electrodes respond to visible light. Recently, some (oxy) nitride materials such as TaON (26,27), Ta 3 N 5 (27, 28), SrN...

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Selective Preparation of Monoclinic and Tetragonal BiVO₄with Scheelite Structure and Their Photocatalytic Properties

Cited by 996 publications

References 28 publications

Visible-light sensitive cobalt-doped BiVO4 (Co-BiVO4) photocatalytic composites for the degradation of methylene blue dye in dilute aqueous solutions

Visible-light sensitive cobalt-doped BiVO4 (Co-BiVO4) photocatalytic composites for the degradation of methylene blue dye in dilute aqueous solutions

Exalted photocatalytic activity of tetragonal BiVO₄by Er³⁺doping through a luminescence cooperative mechanism

Facile fabrication of an efficient BiVO ₄ thin film electrode for water splitting under visible light irradiation

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Selective Preparation of Monoclinic and Tetragonal BiVO4with Scheelite Structure and Their Photocatalytic Properties

Cited by 996 publications

References 28 publications

Visible-light sensitive cobalt-doped BiVO4 (Co-BiVO4) photocatalytic composites for the degradation of methylene blue dye in dilute aqueous solutions

Visible-light sensitive cobalt-doped BiVO4 (Co-BiVO4) photocatalytic composites for the degradation of methylene blue dye in dilute aqueous solutions

Exalted photocatalytic activity of tetragonal BiVO4by Er3+doping through a luminescence cooperative mechanism

Facile fabrication of an efficient BiVO 4 thin film electrode for water splitting under visible light irradiation

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Selective Preparation of Monoclinic and Tetragonal BiVO₄with Scheelite Structure and Their Photocatalytic Properties

Exalted photocatalytic activity of tetragonal BiVO₄by Er³⁺doping through a luminescence cooperative mechanism

Facile fabrication of an efficient BiVO ₄ thin film electrode for water splitting under visible light irradiation