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Tetragonal tungsten bronze-type nanorod photocatalysts with tunnel structure : Ta substitution for Nb and overall water splitting

Title data

Wang, Ping ; Schwertmann, Larissa ; Marschall, Roland ; Wark, Michael:
Tetragonal tungsten bronze-type nanorod photocatalysts with tunnel structure : Ta substitution for Nb and overall water splitting.
In: Journal of Materials Chemistry A. Vol. 2 (2014) Issue 23 . - pp. 8815-8822.
ISSN 2050-7488
DOI: https://doi.org/10.1039/c4ta01393j

Abstract in another language

Tetragonal tungsten bronze-type tantalum (Ta) substituted Sr2KNb5O15 nanorod photocatalysts with tunnel structure were prepared by a facile and low-cost molten salt method using potassium chloride (KCl) at 850 [degree]C for only 2 h. Although all native photocatalysts did not possess any detectable activity in pure water splitting, after deposition of NiOx (double-layered Ni/NiO) as co-catalysts, samples of Sr2KNb5O15 and Sr2KTa5O15 can split pure water into H2 and O2 in a stoichiometric amount ([approximate] 2:1), which can be ascribed to the improved charge carrier separation and transfer in the presence of NiOx. Furthermore, Ta substitution effects on the photocatalytic behaviour were systematically investigated for hydrogen production by aqueous methanol reforming. The average H2 formation rates of Sr2KNb5-xTaxO15 first decrease with tantalum substitution for x < 2.5, presumably due to a decreased amount of absorbed photons and an obvious reduction of their exposed surface areas, whereas the activity is significantly improved for samples containing more Ta (x > 2.5) and especially the fully substituted Sr2KTa5O15. This can be explained by a stronger driving force for photogenerated conduction band electrons to reduce water.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Lehrstuhl Physikalische Chemie III > Lehrstuhl Physikalische Chemie III - Univ.-Prof. Dr. Roland Marschall
Result of work at the UBT: No
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 05 Sep 2018 07:33
Last Modified: 30 Oct 2018 07:40
URI: https://eref.uni-bayreuth.de/id/eprint/45715