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Proceedings Paper

Photocatalytic hydrogen production using surface-modified titania nanoparticles
Author(s): Wonyong Choi
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Paper Abstract

Titanium dioxide, the most popular photocatalyst, is inactive under visible light, which limits the practical application of TiO2 as a solar energy harvesting catalyst. This study investigated the photocatalytic hydrogen production on TiO2 nanoparticles whose surface was modified in different ways. Dye-sensitized TiO2, nafion-coated TiO2, CdS/TiO2 nanocomposites, and surface fluorinated/platinized TiO2 were prepared and tested for the hydrogen generation under visible or UV irradiation. We synthesized six ruthenium sensitizers having different numbers of carboxylic (c-RuL3) or phosphonic (p-RuL3) linkage groups, anchored them onto TiO2 surface, and tested their visible light reactivity for hydrogen production. p-RuL3 with two phosphonate groups was the most efficient for hydrogen production. On the other hand, Ru(bpy)32+ (as a cationic form) whose bipyridyl ligands were not functionalized with carboxylic acid groups was bound within the nafion layer on TiO2 through electrostatic attraction. The visible light-sensitized H2 production on Nf/TiO2 using Ru(bpy)3 2+ was far more efficient than that on c-RuL3-TiO2. The roles of nafion layer on TiO2 in the sensitized H2 production are proposed to be two fold: to provide binding sites for cationic sensitizers and to enhance the local activity of protons in the surface region. TiO2 nanoparticles sensitized with CdS quantum dots were also investigated for H2 production. Finally, the simultaneously platinized and fluorinated TiO2 (F-Pt-TiO2) was tested for the generation of hydrogen under UV illumination. The production of hydrogen was negligible with F-TiO2 and Pt-TiO2 but was significant with F-Pt-TiO2 even in the absence of organic electron donors. The hydrogen production was highly enhanced in the presence of 4-chlorophenol, which realized the simultaneous degradation of organic substrates and the production of hydrogen.

Paper Details

Date Published: 14 September 2007
PDF: 9 pages
Proc. SPIE 6650, Solar Hydrogen and Nanotechnology II, 66500L (14 September 2007); doi: 10.1117/12.737292
Show Author Affiliations
Wonyong Choi, Pohang Univ. of Science and Technology (South Korea)

Published in SPIE Proceedings Vol. 6650:
Solar Hydrogen and Nanotechnology II
Jinghua Guo, Editor(s)

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