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Facet-Dependent Interfacial Charge Transfer in Fe(III)-Grafted TiO2 Nanostructures Activated by Visible Light
journal contribution
posted on 2018-08-31, 00:00 authored by Hui Zhang, Weimin Wang, Huanxin Zhao, Lixia Zhao, Li-Yong Gan, Liang-Hong GuoInterface
engineering in heterogeneous catalysis is fascinating
because of the modulation of charge-transfer processes and catalytic
activity. Herein, by constructing Fe(III)–TiO2 systems
with different interfacial contact facets, {101} and {001} facets,
we demonstrate the facet-dependent interfacial charge transfer properties
of TiO2/Fe(III) system activated by visible light. Although
the photoreactivity of the {001} facet is documented to be higher
than that of the {101} facet under UV light, phenol photodegradation
experiments reveal that under visible light {101} TiO2/Fe(III)
exhibits significantly higher photocatalytic activity than {001} TiO2/Fe(III). Photoelectrochemical measurements and computational
calculations suggest that the {101} TiO2/Fe(III) interface
significantly promotes interfacial electron transfer compared with
the {001} TiO2/Fe(III) interface owing to the facet-specific
electron–hole transport properties of the {101} and {001} facets
in the TiO2 crystals. The reduced Fe(III) nanoclusters
on the {101} TiO2 surface facilitate the reduction of adsorbed
O2 molecules to H2O2 via multielectron
transfer processes and simultaneously promote hole generation in VB(TiO2) to oxidize organic contaminants. These findings demonstrate
the crucial roles of the facet in determining interfacial charge transfer
processes and will be applicable for designing high-performance catalysts.
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Keywords
TiO 2 crystalsphenol photodegradation experimentscharge-transfer processesFacet-Dependent Interfacial Charge Transferhole generationcharge transfer propertiescharge transfer processeselectron transferO 2 moleculesFeVisible Light Interface engineeringH 2 O 2multielectron transfer processesVBphotocatalytic activityUV lightcontact facets
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