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Visible Light Photocatalysis with c-WO3–x/WO3×H2O Nanoheterostructures In Situ Formed in Mesoporous Polycarbosilane-Siloxane Polymer

Seifollahi Bazarjani, Mahdi and Hojamberdiev, Mirabbos and Morita, Koji and Zhu, Gangqiang and Cherkashinin, Gennady and Fasel, Claudia and Herrmann, Thomas and Breitzke, Hergen and Gurlo, Aleksander and Riedel, Ralf (2013):
Visible Light Photocatalysis with c-WO3–x/WO3×H2O Nanoheterostructures In Situ Formed in Mesoporous Polycarbosilane-Siloxane Polymer.
In: Journal of the American Chemical Society, ACS Publications, pp. 4467-4475, 135, (11), ISSN 0002-7863, [Online-Edition: http://dx.doi.org/10.1021/ja3126678],
[Article]

Abstract

In recent years, there have been significant efforts to find novel photocatalytic materials with improved properties. Thus, there is an active ongoing search for new materials that can operate at a broad range of wavelengths for photocatalytic reactions. Among photocatalytically active semiconductors, considerable attention has been given to tungsten oxide with a band gap of Eg ≈ 2.6 eV, which provides the opportunity to harvest visible light. In the present work, we report on a one-step synthesis of c-WO3–x/WO3×H2O nanowhiskers dispersed in a hydrolytically stable mesoporous polycarbosilane-siloxane ([−Si(O)CH2−]n) matrix. The as-synthesized nanocomposites possess high photocatalytic activity for the degradation of methylene blue (MB) under visible light irradiation. The enhanced photocatalytic activity is due to (i) the reduction in the electron–hole recombination rate because of the reduced dimensions of nanowhiskers, (ii) more efficient consumption of photogenerated electrons and holes as a result of the high surface-to-bulk-ratio of the nanowhiskers, and (iii) better electron–hole pair separation due to the formation of c-WO3–x/WO3×H2O nanoheterostructures.

Item Type: Article
Erschienen: 2013
Creators: Seifollahi Bazarjani, Mahdi and Hojamberdiev, Mirabbos and Morita, Koji and Zhu, Gangqiang and Cherkashinin, Gennady and Fasel, Claudia and Herrmann, Thomas and Breitzke, Hergen and Gurlo, Aleksander and Riedel, Ralf
Title: Visible Light Photocatalysis with c-WO3–x/WO3×H2O Nanoheterostructures In Situ Formed in Mesoporous Polycarbosilane-Siloxane Polymer
Language: English
Abstract:

In recent years, there have been significant efforts to find novel photocatalytic materials with improved properties. Thus, there is an active ongoing search for new materials that can operate at a broad range of wavelengths for photocatalytic reactions. Among photocatalytically active semiconductors, considerable attention has been given to tungsten oxide with a band gap of Eg ≈ 2.6 eV, which provides the opportunity to harvest visible light. In the present work, we report on a one-step synthesis of c-WO3–x/WO3×H2O nanowhiskers dispersed in a hydrolytically stable mesoporous polycarbosilane-siloxane ([−Si(O)CH2−]n) matrix. The as-synthesized nanocomposites possess high photocatalytic activity for the degradation of methylene blue (MB) under visible light irradiation. The enhanced photocatalytic activity is due to (i) the reduction in the electron–hole recombination rate because of the reduced dimensions of nanowhiskers, (ii) more efficient consumption of photogenerated electrons and holes as a result of the high surface-to-bulk-ratio of the nanowhiskers, and (iii) better electron–hole pair separation due to the formation of c-WO3–x/WO3×H2O nanoheterostructures.

Journal or Publication Title: Journal of the American Chemical Society
Volume: 135
Number: 11
Publisher: ACS Publications
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science > Surface Science
07 Department of Chemistry
07 Department of Chemistry > Fachgebiet Anorganische Chemie
07 Department of Chemistry > Physical Chemistry
Date Deposited: 04 Feb 2014 09:02
Official URL: http://dx.doi.org/10.1021/ja3126678
Identification Number: doi:10.1021/ja3126678
Funders: Financial support by the priority program “ Adapting surfaces for high temperature applications ” (SPP 1299) of the German Research Foundation (DFG) is greatly acknowledged. , R.R. thanks the Fonds der Chemischen Industrie, Frankfurt, Germany, for continuous financial support. , M.H. is grateful to the Alexander von Humboldt Stifung for a postdoctoral fellowship.
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