Enhanced photocatalytic hydrogen generation from barium tantalate composites

(111)-layered Ba 5 Ta 4 O 15 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 Ba 3 Ta 5 O 15 , 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 Ba 5 Ta 4 O 15 /Ba 3 Ta 5 O 15 composite in comparison to the pure Ba 5 Ta 4 O 15 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 Ba 5 Ta 4 O 15 /Ba 3 Ta 5 O 15 composite, up to 160% higher than for the pure Ba 5 Ta 4 O 15 , were determined, and only very small amounts of Rh co-catalyst, deposited on the photocatalysts by stepwise reductive photodeposition, were needed to achieve these results.