Photocatalytic Performance of Ba5Ta4O15 to Decomposition of H2O into H2 and O2

Otsuka, Harumi; Kim, Ki‐Young; Kouzu, Asuka; Takimoto, Ikuharu; Fujimori, Hirotaka; Sakata, Yoshihisa; Imamura, Hayao; Matsumoto, Takako; Toda, Kenji

doi:10.1246/cl.2005.822

Cited by 70 publications

(38 citation statements)

References 8 publications

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“…The preferable state of Zn added Ga 2 O 3 photocatalyst contains 1 atomic % of Zn ion and obtained by calcining at around 1,223 K. The photocatalytic activity of H 2 O splitting over Ni(1 wt%)/ Zn(1 atom %)--Ga 2 O 3 is 4,100 lmol/h for H 2 and 2,200 lmol/h for O 2 production, respectively. In order to evaluate the photocatalytic activity, the photocatalytic activity of NiO supported Tantalate photocatalysts, which carried out nearly the same photo-reaction system, were investigated from previous reports [1,2,[14][15][16]. It was confirmed that the photocatalytic activity of Ni/Zn-Ga 2 O 3 exhibited the same extent as alkali or alkali earth tantalum mixed oxide photocatalysts.…”

Section: Resultsmentioning

confidence: 89%

Effect of Metal Ion Addition in a Ni Supported Ga2O3 Photocatalyst on the Photocatalytic Overall Splitting of H2O

et al. 2008

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The effects of the addition of a metal ion in a Ni supported Ga 2 O 3 photocatalyst on the photocatalytic overall splitting of H 2 O were investigated. The addition of Ca, Cr, Zn, Sr, Ba and Ta ions were effective in improving the photocatalytic activity. Particularly, the addition of the Zn ion improved the photocatalytic activity remarkably. The states of the photocatalyst after the addition of Zn ion are discussed.

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Section: Resultsmentioning

confidence: 89%

Effect of Metal Ion Addition in a Ni Supported Ga2O3 Photocatalyst on the Photocatalytic Overall Splitting of H2O

et al. 2008

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“…For example, Sr 2 Nb 2 O 7 (4.0 eV) and Sr 2 Ta 2 O 7 (4.6 eV), [21][22][23] La 3 NbO 7 (3.9 eV) and La 3 TaO 7 (4.6 eV), [24,25] Rb 4 Nb 6 O 17 (3.4 eV) and Rb 4 Ta 6 O 17 (4.2 eV), [26] [27][28][29] have been reported as highly active photocatalysts for water splitting. However, the band gaps of these niobate photocatalysts are so wide, except for Rb 4 Nb 6 O 17 , because the energy structures of these photocatalysts localize, more or less, due to large distortion of a framework of a crystal structure or decreasing of structural three-dimensionality as discussed in the previous paper.…”

Section: Introductionmentioning

confidence: 99%

Water Splitting over New Niobate Photocatalysts with Tungsten‐Bronze‐Type Structure and Effect of Transition Metal‐Doping

Miseki

Kudo

2010

ChemSusChem

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Photophysical properties and photocatalytic activities for water splitting over KM(2)Nb(5)O(15) (M = Sr and Ba) and K(2)LnNb(5)O(15) (Ln = La, Pr, Nd, and Sm) with tungsten bronze-type structure were investigated. Single phases of KM(2)Nb(5)O(15) and K(2)LnNb(5)O(15) were successfully prepared by solid-state reaction (SSR) method and polymerizable complex (PC) method. The band gaps of these niobates were estimated to be 3.1-3.5 eV. These metal oxides loaded with an activated NiO(x) cocatalyst showed photocatalytic activities for water splitting into H(2) and O(2) under UV irradiation. When K(2)LaNb(5)O(15) was doped by Rh ions, a new visible-light absorption band was observed around 400-500 nm in addition to the band gap absorption band of the K(2)LaNb(5)O(15) host. K(2)LaNb(5)O(15):Rh showed photocatalytic activities for H(2) or O(2) evolution from an aqueous solution containing a sacrificial reagent under visible-light irradiation.

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“…1,2 Recently, new photocatalysts consisting of metal ions with d 0 and d 10 electron configurations have been developed for photocatalytic H 2 and O 2 evolution from water under UV irradiation, one after another. [1][2][3][4][5][6][7][8][9][10] have been also reported as photocatalysts. Especially, the GaN:ZnO photocatalyst is active for water splitting into H 2 and O 2 .…”

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confidence: 99%

Investigations of Electronic Structures and Photocatalytic Activities under Visible Light Irradiation of Lead Molybdate Replaced with Chromium(VI)

Shimodaira¹,

Kato²,

Kobayashi³

et al. 2007

Bulletin of the Chemical Society of Japan

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Chromium-replaced PbMoO 4 , PbMo 1Àx Cr x O 4 , prepared by an aqueous reflux method, showed a photocatalytic activity for O 2 evolution from an aqueous solution containing an electron accepter, such as Ag þ or Fe 3þ under visible light irradiation (vis) ( ! 420 nm). PbMo 0:98 Cr 0:02 O 4 (Energy gap: 2.26 eV) showed the highest activity for the O 2 evolution under vis and UV + vis light irradiation. The activity of PbMo 0:98 Cr 0:02 O 4 was one order of magnitude higher than that of PbMoO 4 under UV + vis light irradiation. The crystal structures of PbMo 1Àx Cr x O 4 were studied by the Rietveld analysis for powder X-ray diffraction. PbMo 1Àx Cr x O 4 had a scheelite-type structure when x was equal to or smaller than 0.2. The energy band structures of PbMo 1Àx Cr x O 4 were calculated based on density functional theory using the structural parameters refined by the Rietveld analysis. It was revealed that the top of the valence band of PbMoO 4 consisted of O2p and Pb6s orbitals and the accepter level was composed of a Cr3d orbital in the forbidden band below the conduction band consisting of a Mo4d orbital. It was concluded that the visible light response was due to the excitation from the Pb6s + O2p valence band to the Cr3d accepter level.Photocatalytic water splitting into H 2 and O 2 is an important reaction from the viewpoint of the global energy and the environmental issues.1,2 Recently, new photocatalysts consisting of metal ions with d 0 and d 10 electron configurations have been developed for photocatalytic H 2 and O 2 evolution from water under UV irradiation, one after another.

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Photocatalytic Performance of Ba5Ta4O15 to Decomposition of H2O into H2 and O2

Cited by 70 publications

References 8 publications

Effect of Metal Ion Addition in a Ni Supported Ga2O3 Photocatalyst on the Photocatalytic Overall Splitting of H2O

Effect of Metal Ion Addition in a Ni Supported Ga2O3 Photocatalyst on the Photocatalytic Overall Splitting of H2O

Water Splitting over New Niobate Photocatalysts with Tungsten‐Bronze‐Type Structure and Effect of Transition Metal‐Doping

Investigations of Electronic Structures and Photocatalytic Activities under Visible Light Irradiation of Lead Molybdate Replaced with Chromium(VI)

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