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Issue 4, 2013
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Enhanced photocatalytic hydrogen generation from barium tantalate composites

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Abstract

(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.

Graphical abstract: Enhanced photocatalytic hydrogen generation from barium tantalate composites

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The article was received on 19 Jun 2012, accepted on 29 Sep 2012 and first published on 02 Oct 2012


Article type: Paper
DOI: 10.1039/C2PP25200G
Citation: Photochem. Photobiol. Sci., 2013,12, 671-677
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    Enhanced photocatalytic hydrogen generation from barium tantalate composites

    R. Marschall, J. Soldat and M. Wark, Photochem. Photobiol. Sci., 2013, 12, 671
    DOI: 10.1039/C2PP25200G

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