Journal
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
Volume 12, Issue 4, Pages 671-677Publisher
SPRINGERNATURE
DOI: 10.1039/c2pp25200g
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Funding
- Evonik Industries AG
- State of North Rhine-Westphalia
- EUROPEAN UNION: Investing in our Future, European Regional Development Fund
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(111)-layered Ba5Ta4O15 photocatalysts were synthesised by a solid state reaction route and a citrate synthesis route, and their structural and electronic properties were investigated. After citrate route preparation, the presence of a second phase, namely Ba3Ta5O15, was determined by X-ray powder diffraction and absorption spectroscopy. The existence of this phase had a profound effect on the photocatalytic activity of this Ba5Ta4O15/Ba3Ta5O15 composite in comparison to the pure Ba5Ta4O15 materials. The photocatalytic performance of the barium tantalates was evaluated by investigating the capability in (OH)-O-center dot radical formation and hydrogen generation. Strongly increased hydrogen evolution rates for the Ba5Ta4O15/Ba3Ta5O15 composite, up to 160% higher than for the pure Ba5Ta4O15, were determined, and only very small amounts of Rh co-catalyst, deposited on the photocatalysts by stepwise reductive photo-deposition, were needed to achieve these results.
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