Journal article
Authors list: Wang, Ping; Schwertmann, Larissa; Marschall, Roland; Wark, Michael
Publication year: 2014
Pages: 8815-8822
Journal: Journal of Materials Chemistry A: materials for energy and sustainability
Volume number: 2
Issue number: 23
ISSN: 2050-7488
eISSN: 2050-7496
Open access status: Hybrid
DOI Link: https://doi.org/10.1039/c4ta01393j
Publisher: Royal Society of Chemistry
Abstract:
Tetragonal tungsten bronze-type tantalum (Ta) substituted Sr2KNb5O15 nanorod photocatalysts with tunnel structures were prepared by a facile and low-cost molten salt method using potassium chloride (KCl) at 850 degrees 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 H-2 and O-2 in a stoichiometric amount (approximate to 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 H-2 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.
Citation Styles
Harvard Citation style: Wang, P., Schwertmann, L., Marschall, R. and Wark, M. (2014) Tetragonal tungsten bronze-type nanorod photocatalysts with tunnel structures: Ta substitution for Nb and overall water splitting, Journal of Materials Chemistry A: materials for energy and sustainability, 2(23), pp. 8815-8822. https://doi.org/10.1039/c4ta01393j
APA Citation style: Wang, P., Schwertmann, L., Marschall, R., & Wark, M. (2014). Tetragonal tungsten bronze-type nanorod photocatalysts with tunnel structures: Ta substitution for Nb and overall water splitting. Journal of Materials Chemistry A: materials for energy and sustainability. 2(23), 8815-8822. https://doi.org/10.1039/c4ta01393j
Keywords
ANISOMETRIC KSR2NB5O15 PARTICLES; CERAMICS; PHASE-FORMATION; SR2NANB5O15
