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TiO-Based Nanomaterials for the Production of Hydrogen and the Development of Lithium-Ion Batteries Sergio Pinilla, Abniel Machin, Sang Hoon Park, Juan Camilo Arango, Valeria Nicolosi, Francisco M. Marquez-Linares, and Carmen Morant J. Phys. Chem. B, Just Accepted Manuscript • DOI: 10.1021/acs.jpcb.7b07130 • Publication Date (Web): 23 Oct 2017 Downloaded from http://pubs.acs.org on October 24, 2017
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The Journal of Physical Chemistry
TiO2-Based Nanomaterials for the Production of Hydrogen and the Development of Lithium-ion Batteries Sergio Pinilla1, Abniel Machín2, Sang-Hoon Park3, Juan C. Arango2, Valeria Nicolosi3, Francisco Márquez -Linares2*, and Carmen Morant1* 1
Department of Applied Physics and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, 28049 Madrid, Spain
2
School of Natural Sciences and Technology, Universidad del Turabo, Gurabo, PR00778, USA 3
CRANN and AMBER research centers, Trinity College Dublin, Dublin 2, Ireland
ABSTRACT
The photocatalytic activity of different titanium oxide nanowires containing gold (Au@TiO2NWs), and gold-graphene (Au@TiO2NWs-graphene), was evaluated by studying the reaction of hydrogen production by water splitting under UV-vis light. The composites showed high surface areas, with values above 300 m2 per gram, even after the incorporation of gold and graphene on the surface of titanium oxide nanowires. The highest hydrogen production of Au@TiO2NWs was 1,436 µmol h-1 g-1, under irradiation at 400 nm, and with a gold loading of
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The Journal of Physical Chemistry
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10 wt.%. This photocatalytic activity was 11.5 times greater than that shown by the unmodified TiO2NWs. For the Au@TiO2NWs-graphene composites, the highest hydrogen amount obtained was 1,689 µmol h-1 g-1, at loadings of 10 wt.% and 1 wt.% of gold and graphene, respectively. The photocatalytic activity of the gold-graphene compounds was 1.2 times greater than that shown by the titanium oxide catalysts and 13.5 times higher than the bare TiO2NWs. Even at wavelengths greater than 500 nm, the compounds exhibited yields of hydrogen above 1000 µmol h-1 g-1, demonstrating the high catalytic activity of the compounds.
In addition, TiO2-based materials are of great interest for energy storage and conversion devices, in particular for rechargeable lithium ion batteries. TiO2 has a significant advantage due to its low volume change (
