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 Sn |
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| 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] |
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| Database: | Engineering Source |
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