Controlled Synthesis of TiO <inf>2</inf> Nanostructures: Exceptional Hydrogen Production in Alcohol-Water Mixtures over Cu(OH) <inf>2</inf> –Ni(OH) <inf>2</inf> /TiO <inf>2</inf> Nanorods

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Journal Article
ChemistrySelect, 2017, 2 (25), pp. 7497 - 7507
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© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Development of non-noble metal photocatalysts for hydrogen (H 2 ) generation from renewables is important towards cost effective technology. Titania nanorods with different phase compositions and surface areas were fabricated by calcination of hydrogen titanate (H 2 Ti 3 O 7 ) precursors obtained by treating P25 (TiO 2 ) hydrothermally in 10 M NaOH and followed by HCl washing. Subsequently the copper and nickel hydroxides were co-deposited over TiO 2 nanorods and used to generate H 2 from alcohol-water mixtures under UV light. Among the synthesized materials, the optimized photocatalyst 0.8Cu(OH) 2 -0.2Ni(OH) 2 /TNR 130 -400 showed very high H 2 production rates that are 26.6 mmol h −1 g −1 in 20 vol.% ethanol-water mixture and 35.1 mmol h −1 g −1 in 5 vol.% glycerol-water mixtures. The amount of this H 2 production is even higher than obtained from noble metal supported TiO 2 photocatalysts. This exceptional photocatalytic H 2 production is attributed to the high synergism among nanords mophology of support and in situ formation of Cu and Ni exclusively in metallic states during photoreactions.
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