Vibrational spectra of Sn2TiO4

Baran, Enrique J.; González‐Baró, Ana C.; Kumada, N.; Kinomura, Nobukazu; Takei, Takahiro; Yonesaki, Yoshinori

doi:10.1016/j.jallcom.2009.09.179

Cited by 4 publications

(2 citation statements)

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“…There are notable structural cavities within the crystal structure stabilized by the SnO 3 pyramids via van der Waals interactions of the stereoactive lone pairs on Sn(II). 13,16,47 The crystal structure of Sn 2 TiO 4 is isostructural to the low-temperature form of Pb 3 O 4 , which has only been reported for a few other materials including Sb 2 CoO 4 , Pb 2 SnO 4 , and Sb 2 ZnO 4 . 16,48 The crystal growth of Sn 2 TiO 4 is stabilized in the low-temperature Pb 3 O 4 structure, as it simultaneously satisfies the coordination preferences of both the Sn(II) and Ti(IV) cations.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Flux Synthesis, Optical and Photocatalytic Properties ofn-type Sn₂TiO₄: Hydrogen and Oxygen Evolution under Visible Light

et al. 2016

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The n-type Sn2TiO4 phase was synthesized using flux methods and found to have one of the smallest visible-light bandgap sizes known that also maintains suitable conduction and valence band energies for driving photocatalytic water-splitting reactions. The Sn2TiO4 phase was synthesized using either a SnCl2 flux or a SnCl2/SnF2 peritectic flux in a 2:1 flux-to-precursor ratio heated at 600 and 400 °C for 24 h, respectively. The two types of salt fluxes resulted in large rod-shaped particles at 600 °C and smaller tetragonal prism-shaped particles at 400 °C. Surface photovoltage spectroscopy measurements produced a negative photovoltage under illumination >1.50 eV, which confirmed electrons as the majority charge carriers and ∼1.50 eV as the effective band gap. Mott–Schottky measurements at pH 9.0 showed the conduction (−0.54 V vs NHE) and valence band (+1.01 V vs NHE) positions meet the critical thermodynamic requirements for total water splitting. The Sn2TiO4 particles were deposited and annealed as polycrystalline films on FTO slides, and exhibited photoanodic currents in aqueous solutions under visible-light irradiation. The Sn2TiO4 particles were also suspended in aqueous methanol solutions and irradiated with visible and ultraviolet light. The larger rod-shaped Sn2TiO4 particles had the higher rates of photocatalytic hydrogen production (∼11.6 μmol H2 h–1) in comparison to the smaller tetragonal prism-shaped Sn2TiO4 particles (∼3.4 μmol H2 h–1). Conversely, for photocatalytic oxygen production, the rates for the smaller tetragonal prism-shaped particles in aqueous AgNO3 solution were slightly higher (∼16.3 μmol O2 h–1) than for the larger rod-shaped particles (∼11.9 μmol O2 h–1). Apparent quantum yields of 0.995% and 0.0098% were measured for O2 and H2 production, respectively, under 435 nm light.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Flux Synthesis, Optical and Photocatalytic Properties ofn-type Sn₂TiO₄: Hydrogen and Oxygen Evolution under Visible Light

et al. 2016

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“…The calculated lattice constants are within 1 % of experiment and the local bonding environments are well reproduced, namely, the mildly distorted Ti octahedra and the highly distorted four coordinate Sn site.The vibrational spectra of Sn 2 TiO 4 single crystals have been recently measured[52], with a small number of sharp peaks observed in the Raman spectrum. While there exists 84 vibrational modes, owing to the 28 atoms in the unit cell, these are significantly reduced by the symmetry selection rules.…”

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A photoactive titanate with a stereochemically active Sn lone pair: Electronic and crystal structure of Sn2TiO4 from computational chemistry

Burton

Walsh

2012

Journal of Solid State Chemistry

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TiO 2 remains the most widely studied metal oxide for photocatalytic reactions. The standard approach to reduce the band gap of titania, for increasing the absorption of visible light, is anion modification. For example the formation of an oxynitride compound, where the nitrogen 2p states decrease the binding energy of the valence band. We demonstrate that cation modification can produce a similar effect through the formation of a ternary oxide combining Ti and an ns 2 cation, Sn(II). In Sn 2 TiO 4 , the underlying Ti 3d conduction states remain largely unmodified and an electronic band gap of 2.1 eV (590 nm) is predicted by hybrid density functional theory. Our analysis indicates a strong potential for Sn 2 TiO 4 in visible-light driven photocatalysis, which should prove superior to the alternative (SnO 2) 1x (TiO 2) x solid-solution.

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ChemInform Abstract: Vibrational Spectra of Sn₂TiO₄.

et al. 2010

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Vibrational spectra of Sn2TiO4

Cited by 4 publications

References 10 publications

Flux Synthesis, Optical and Photocatalytic Properties ofn-type Sn₂TiO₄: Hydrogen and Oxygen Evolution under Visible Light

Flux Synthesis, Optical and Photocatalytic Properties ofn-type Sn₂TiO₄: Hydrogen and Oxygen Evolution under Visible Light

A photoactive titanate with a stereochemically active Sn lone pair: Electronic and crystal structure of Sn2TiO4 from computational chemistry

ChemInform Abstract: Vibrational Spectra of Sn₂TiO₄.

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Vibrational spectra of Sn2TiO4

Cited by 4 publications

References 10 publications

Flux Synthesis, Optical and Photocatalytic Properties ofn-type Sn2TiO4: Hydrogen and Oxygen Evolution under Visible Light

Flux Synthesis, Optical and Photocatalytic Properties ofn-type Sn2TiO4: Hydrogen and Oxygen Evolution under Visible Light

A photoactive titanate with a stereochemically active Sn lone pair: Electronic and crystal structure of Sn2TiO4 from computational chemistry

ChemInform Abstract: Vibrational Spectra of Sn2TiO4.

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Flux Synthesis, Optical and Photocatalytic Properties ofn-type Sn₂TiO₄: Hydrogen and Oxygen Evolution under Visible Light

Flux Synthesis, Optical and Photocatalytic Properties ofn-type Sn₂TiO₄: Hydrogen and Oxygen Evolution under Visible Light

ChemInform Abstract: Vibrational Spectra of Sn₂TiO₄.