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Fast Flux Reaction Approach for the Preparation of Sn2TiO4: Tuning Particle Sizes and Photocatalytic Properties.

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Title: Fast Flux Reaction Approach for the Preparation of Sn2TiO4: Tuning Particle Sizes and Photocatalytic Properties.
Authors: O'Donnell, Shaun1, Hamilton, Adam1, Maggard, Paul A.1 paul_maggard@ncsu.edu
Source: Journal of The Electrochemical Society. 2019, Vol. 166 Issue 5, pH3084-H3090. 7p.
Subjects: Photocatalysts, Chemical reactions, Nanoparticles
Abstract: The Sn2TiO4 phase is a small-bandgap (Eg ~ 1.6 eV) semiconductor with suitable band energies to drive photocatalytic watersplitting. A new fast flux reaction can be used to prepare high purity Sn2TiO4 in reaction times of down to 5 minutes. Shorter reaction times (5 and 15 min) lead to nanosized particles while longer reaction times (24 hours) yield micron-sized particles. The nanoparticles show an increased bandgap size owing to quantum size effects in the weak confinement regime (r >> aB), increasing by ~0.3 eV from 1.60 eV to 1.89 eV (indirect). From Mott-Schottky analyses, the conduction band edge is found to shift to slightly more negative potentials while the valence band edge exhibits a relatively larger positive shift. Calculations show this arises from the more disperse Sn s-orbital bands at the top of the valence band, compared the large Ti-based d-orbital band at the bottom of the conduction band. The photocatalytic activities of the Sn2TiO4 nanoparticles for molecular hydrogen and oxygen production showed higher rates than the equivalent micron-sized particles as a result of both higher surface areas and higher overpotentials to drive each of the half reactions. [ABSTRACT FROM AUTHOR]
Copyright of Journal of The Electrochemical Society is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: Fast Flux Reaction Approach for the Preparation of Sn<subscript>2</subscript>TiO<subscript>4</subscript>: Tuning Particle Sizes and Photocatalytic Properties.
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  Data: <searchLink fieldCode="AR" term="%22O'Donnell%2C+Shaun%22">O'Donnell, Shaun</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Hamilton%2C+Adam%22">Hamilton, Adam</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Maggard%2C+Paul+A%2E%22">Maggard, Paul A.</searchLink><relatesTo>1</relatesTo><i> paul_maggard@ncsu.edu</i>
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  Data: The Sn2TiO4 phase is a small-bandgap (Eg ~ 1.6 eV) semiconductor with suitable band energies to drive photocatalytic watersplitting. A new fast flux reaction can be used to prepare high purity Sn2TiO4 in reaction times of down to 5 minutes. Shorter reaction times (5 and 15 min) lead to nanosized particles while longer reaction times (24 hours) yield micron-sized particles. The nanoparticles show an increased bandgap size owing to quantum size effects in the weak confinement regime (r >> aB), increasing by ~0.3 eV from 1.60 eV to 1.89 eV (indirect). From Mott-Schottky analyses, the conduction band edge is found to shift to slightly more negative potentials while the valence band edge exhibits a relatively larger positive shift. Calculations show this arises from the more disperse Sn s-orbital bands at the top of the valence band, compared the large Ti-based d-orbital band at the bottom of the conduction band. The photocatalytic activities of the Sn2TiO4 nanoparticles for molecular hydrogen and oxygen production showed higher rates than the equivalent micron-sized particles as a result of both higher surface areas and higher overpotentials to drive each of the half reactions. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of The Electrochemical Society is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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      – SubjectFull: Chemical reactions
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      – SubjectFull: Nanoparticles
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      – TitleFull: Fast Flux Reaction Approach for the Preparation of Sn2TiO4: Tuning Particle Sizes and Photocatalytic Properties.
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