Metal-cluster-decorated TiO2 nanotube arrays : a composite heterostructure toward versatile photocatalytic and photoelectrochemical applications

Recent years have witnessed increasing interest in the solution-phase synthesis of atomically precise thiolate-protected gold clusters (Aux); nonetheless, research on the photocatalytic properties of Aux–semiconductor nanocomposites is still in its infancy. In this work, recently developed glutathio...

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Main Authors: Xiao, Fang-Xing, Hung, Sung-Fu, Miao, Jianwei, Wang, Hsin-Yi, Yang, Hongbin, Liu, Bin
Other Authors: School of Chemical and Biomedical Engineering
Format: Article
Language:English
Published: 2015
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Online Access:https://hdl.handle.net/10356/106861
http://hdl.handle.net/10220/25150
http://dx.doi.org/10.1002/smll.201401919
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1068612019-12-06T22:19:55Z Metal-cluster-decorated TiO2 nanotube arrays : a composite heterostructure toward versatile photocatalytic and photoelectrochemical applications Xiao, Fang-Xing Hung, Sung-Fu Miao, Jianwei Wang, Hsin-Yi Yang, Hongbin Liu, Bin School of Chemical and Biomedical Engineering DRNTU::Engineering::Materials::Nanostructured materials Recent years have witnessed increasing interest in the solution-phase synthesis of atomically precise thiolate-protected gold clusters (Aux); nonetheless, research on the photocatalytic properties of Aux–semiconductor nanocomposites is still in its infancy. In this work, recently developed glutathione-capped gold clusters and highly ordered nanoporous layer-covered TiO2 nanotube arrays (NP-TNTAs) are employed as nanobuilding blocks for the construction of a well-defined Aux/NP-TNTA heterostructure via a facile electrostatic self-assembly strategy. Versatile photocatalytic performances of the Aux/NP-TNTA heterostructure which acts as a model catalyst, including photocatalytic oxidation of organic pollutant, photocatalytic reduction of aromatic nitro compounds and photoelectrochemical (PEC) water splitting under simulated solar light irradiation, are systematically exploited. It is found that synergistic interaction stemming from monodisperse coverage of Aux clusters on NP-TNTAs in combination with hierarchical nanostructure of NP-TNTAs reinforce light absorption of Aux/NP-TNTA heterostructure especially within visible region, hence contributing to the significantly enhanced photocatalytic and PEC water splitting performances. Moreover, photocatalytic and PEC mechanisms over Aux/NP-TNTA heterostructure are elucidated and corresponding reaction models were presented. It is anticipated that this work could boost new insight for photocatalytic properties of metal-cluster-sensitized semiconductor nanocomposites. 2015-03-03T01:56:16Z 2019-12-06T22:19:55Z 2015-03-03T01:56:16Z 2019-12-06T22:19:55Z 2014 2014 Journal Article Xiao, F.-X., Hung, S.-F., Miao, J., Wang, H.-Y., Yang, H., & Liu, B. (2015). Metal-cluster-decorated TiO2 nanotube arrays : a composite heterostructure toward versatile photocatalytic and photoelectrochemical applications. Small, 11(5), 554-567. 1613-6810 https://hdl.handle.net/10356/106861 http://hdl.handle.net/10220/25150 http://dx.doi.org/10.1002/smll.201401919 en Small © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Materials::Nanostructured materials
spellingShingle DRNTU::Engineering::Materials::Nanostructured materials
Xiao, Fang-Xing
Hung, Sung-Fu
Miao, Jianwei
Wang, Hsin-Yi
Yang, Hongbin
Liu, Bin
Metal-cluster-decorated TiO2 nanotube arrays : a composite heterostructure toward versatile photocatalytic and photoelectrochemical applications
description Recent years have witnessed increasing interest in the solution-phase synthesis of atomically precise thiolate-protected gold clusters (Aux); nonetheless, research on the photocatalytic properties of Aux–semiconductor nanocomposites is still in its infancy. In this work, recently developed glutathione-capped gold clusters and highly ordered nanoporous layer-covered TiO2 nanotube arrays (NP-TNTAs) are employed as nanobuilding blocks for the construction of a well-defined Aux/NP-TNTA heterostructure via a facile electrostatic self-assembly strategy. Versatile photocatalytic performances of the Aux/NP-TNTA heterostructure which acts as a model catalyst, including photocatalytic oxidation of organic pollutant, photocatalytic reduction of aromatic nitro compounds and photoelectrochemical (PEC) water splitting under simulated solar light irradiation, are systematically exploited. It is found that synergistic interaction stemming from monodisperse coverage of Aux clusters on NP-TNTAs in combination with hierarchical nanostructure of NP-TNTAs reinforce light absorption of Aux/NP-TNTA heterostructure especially within visible region, hence contributing to the significantly enhanced photocatalytic and PEC water splitting performances. Moreover, photocatalytic and PEC mechanisms over Aux/NP-TNTA heterostructure are elucidated and corresponding reaction models were presented. It is anticipated that this work could boost new insight for photocatalytic properties of metal-cluster-sensitized semiconductor nanocomposites.
author2 School of Chemical and Biomedical Engineering
author_facet School of Chemical and Biomedical Engineering
Xiao, Fang-Xing
Hung, Sung-Fu
Miao, Jianwei
Wang, Hsin-Yi
Yang, Hongbin
Liu, Bin
format Article
author Xiao, Fang-Xing
Hung, Sung-Fu
Miao, Jianwei
Wang, Hsin-Yi
Yang, Hongbin
Liu, Bin
author_sort Xiao, Fang-Xing
title Metal-cluster-decorated TiO2 nanotube arrays : a composite heterostructure toward versatile photocatalytic and photoelectrochemical applications
title_short Metal-cluster-decorated TiO2 nanotube arrays : a composite heterostructure toward versatile photocatalytic and photoelectrochemical applications
title_full Metal-cluster-decorated TiO2 nanotube arrays : a composite heterostructure toward versatile photocatalytic and photoelectrochemical applications
title_fullStr Metal-cluster-decorated TiO2 nanotube arrays : a composite heterostructure toward versatile photocatalytic and photoelectrochemical applications
title_full_unstemmed Metal-cluster-decorated TiO2 nanotube arrays : a composite heterostructure toward versatile photocatalytic and photoelectrochemical applications
title_sort metal-cluster-decorated tio2 nanotube arrays : a composite heterostructure toward versatile photocatalytic and photoelectrochemical applications
publishDate 2015
url https://hdl.handle.net/10356/106861
http://hdl.handle.net/10220/25150
http://dx.doi.org/10.1002/smll.201401919
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