A series of TiO2 nanoshapes (microurchins, nanobelts, nanowires, microrods and nanotubes) were prepared and decorated with preformed nanoparticles of Au-Cu alloy (Au:Cu = 3:1 molar, 1 wt.% metal content). The resulting photocatalysts were tested for the photogeneration of hydrogen using water-ethanol gaseous mixtures (H2O:EtOH = 1:9 molar basis) under dynamic conditions (26,000 h(-1)) and compared with a conventional sample prepared using P25. The use of preformed nanoparticles of Au-Cu alloy with the same geometric and electronic characteristics ensured a proper assessment of the influence of the different TiO2 supports on the photoproduction of hydrogen by providing a similar number and quality of metal-support contact points. The yield of hydrogen produced on a weight basis over the Au3Cu/TiO2 samples followed the trend microrods similar to P25 > > nanotubes > nanowires > nanobelts > microurchins. A stable hydrogen photogeneration rate of ca. 270 mu mol H-2 g(-1)min(-1) was obtained over titania microrods decorated with Au3Cu whereas the photogeneration of hydrogen over P25 decorated with Au3Cu decreased progressively over time on stream.