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Photochem Photobiol Sci. 2013 Apr;12(4):671-7. doi: 10.1039/c2pp25200g.

Enhanced photocatalytic hydrogen generation from barium tantalate composites.

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Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitaetsstrasse 150, 44801 Bochum, Germany.

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  • Photochem Photobiol Sci. 2013 Dec;12(12):2202. Busser, G Wilma [added].


(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 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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