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Sol-gel synthesis of defect-pyrochlore structured CsTaWO6 and the tribochemical influences on photocatalytic activity

Title data

Schwertmann, Larissa ; Wark, Michael ; Marschall, Roland:
Sol-gel synthesis of defect-pyrochlore structured CsTaWO6 and the tribochemical influences on photocatalytic activity.
In: RSC Advances. Vol. 3 (2013) Issue 41 . - pp. 18908-18915.
ISSN 2046-2069
DOI: https://doi.org/10.1039/c3ra42768d

Abstract in another language

The semiconductor mixed oxide photocatalyst CsTaWO6 was prepared via an aqueous sol-gel citrate route for the first time. The mild reaction conditions yield smaller primary particle sizes and larger specific surface areas than the conventional solid state reaction. The photocatalytic properties are determined using both photocatalytic terephthalic acid hydroxylation and photocatalytic hydrogen generation. All of the materials described herein generate hydrogen without the addition of a co-catalyst. Due to the initially agglomerated but porous morphology of the sol-gel-derived CsTaWO6, tribochemical treatment via short term ball milling has a strong effect on the photocatalytic activities of these materials. Ball milling increases the surface area of the materials, leading to strongly improved activity for the generation of [radical dot]OH radicals, but also generates surface defects in the materials. The defective sites act as electron traps, which depress the photocatalytic hydrogen evolution activity. However, by combining ball milling and photodeposition of Rh, highly improved hydrogen generation rates for CsTaWO6 are achieved. The sol-gel citrate route finally leads to more active materials than the solid state reaction.

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 05:53
Last Modified: 30 Oct 2018 07:40
URI: https://eref.uni-bayreuth.de/id/eprint/45705