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Pore Structure Controlling the Activity of Mesoporous Crystalline CsTaWO6 for Photocatalytic Hydrogen Generation

Title data

Weller, Tobias ; Sann, Joachim ; Marschall, Roland:
Pore Structure Controlling the Activity of Mesoporous Crystalline CsTaWO6 for Photocatalytic Hydrogen Generation.
In: Advanced Energy Materials. Vol. 6 (2016) Issue 16 . - No. 1600208.
ISSN 1614-6840
DOI: https://doi.org/10.1002/aenm.201600208

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

The quaternary oxide CsTaWO6 exhibits a very high activity for photocatalytic hydrogen generation and water splitting. To improve its properties with regard to photocatalytic applications, it is prepared with mesoporous morphology for the first time, utilizing a template-based evaporation-induced self-assembly process. The resulting material exhibits a median mesopore size of 10 nm, a surface area of 60 m2 g−1, and high crystallinity after preparation at 550 °C with phase-pure defect-pyrochlore structure. To further improve the textural properties of mesoporous CsTaWO6, the addition of additives to the synthesis procedure is also investigated. By using H2SO4/HCl and a carbonization/oxidation procedure, the surface area of the resulting mesoporous CsTaWO6 is increased to 78 m2 g−1, which is a 20-fold increase compared to a nonporous reference via sol-gel preparation, also leading to improved photocatalytic activity. By investigating the ability for photocatalytic hydrogen generation, the importance of high surface area and pore diameter of the resulting materials in comparison to nonporous materials is presented. Interestingly, the photocatalytic activity does not increase linearly with surface area, due to a strong influence of the pore diameter on the photocatalytic activity.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: hydrogen generation
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 08:28
Last Modified: 30 Oct 2018 07:40
URI: https://eref.uni-bayreuth.de/id/eprint/45721