Titania supported MOF-199 derived Cu-Cu <inf>2</inf> O nanoparticles: Highly efficient non-noble metal photocatalysts for hydrogen production from alcohol-water mixtures

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Journal Article
Catalysis Science and Technology, 2017, 7 (3), pp. 677 - 686
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© The Royal Society of Chemistry 2017. Fabrication of cheap and efficient photocatalysts is pivotal for practical applications of solar energy devices. Here, we illustrate a novel trend in generating Cu-Cu 2 O nanoparticles over TiO 2 for water splitting systems. Titanium(IV) isopropoxide was hydrolysed in the presence of various wt% of MOF-199 ([Cu 3 (BTC) 2 (H 2 O) 3 ] n ) to obtain TiO 2 -MOF-199 composite materials. These composite materials are then calcined at various temperatures in air to produce highly dispersed Cu-Cu 2 O nanoparticles over TiO 2 ; these nanoparticles were tested as photocatalyts for hydrogen generation from alcohol-water mixtures. The photocatalyst 1 wt% Cu/TiO 2 -400 was found to exhibit a hydrogen production rate some 2.5 times higher than that of CuO prepared by conventional precipitation methods. The calcination temperature of the TiO 2 -MOF composite was found to affect the oxidation state of Cu and the photocatalytic activity, with an optimum performance achieved at 400°C. Calcination beyond this temperature led to oxidation and agglomeration of Cu-Cu 2 O nanoparticles into larger CuO deposits, which reduce the H 2 production activity (ca. 80%).
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