Journal
CATALYSIS TODAY
Volume 146, Issue 1-2, Pages 177-182Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2009.02.021
Keywords
Water splitting; Hydrogen production; Titania nanotube; Ir and Co; Visible light
Funding
- National Research Foundation of Korea [과C6B1912] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Highly dispersed iridium and cobalt metal particles (average 3 nm) were introduced in the texture of the synthesized titania nanotube (TiNT) by ion-exchange method, which were found to be effective photocatalysts for the production of stoichiometric hydrogen and oxygen by the splitting of water under the visible light irradiation. Thus prepared Ir(IE)/TiNT and Co(IE)/TiNT catalysts evolved hydrogen at the rate of 7.05 mu mol/h/0.5 g and 1.27 mu mol/h/0.5 g in aqueous methanol and 2.73 mu mol/h/0.5 g and 0.67 mu mol/h/0.5 g in pure water, respectively. The band gap energies were decreased to 2.5 eV and 2.6 eV from 3.1 eV of bare TiNT by introducing highly dispersed It and Co nanoparticles in the texture of TiNT, respectively, resulting in the improved photo-response towards visible light. However, visible light photo-activity for water splitting was not observed on the large aggregated Ir and Co particles on TiNT prepared by impregnation method. The prepared catalysts were characterized by FE-SEM, HR-TEM, SEMEDX, XRD, UV-vis DRS spectra, photocurrent density and BET surface area. (C) 2009 Published by Elsevier B.V.
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