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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 33, Number 7
BKCSDE 33(7)
July 20, 2012 

 
Title
A Newly Designed a TiO2-Loaded Spherical ZnS Nano/Micro-Composites for High Hydrogen Production from Methanol/Water Solution Photo-Splitting
Author
Jieun Kim, Misook Kang*
Keywords
TiO2/ZnS nano/micro-composite, Hydrogen production, Methanol/water photo-splitting, Band gap
Abstract
A new system using TiO2 (nano-sized, band-gap 3.14 eV)-impregnated spherical ZnS (micro-sized, band-gap 2.73 eV) nano/micro-composites (Ti 0.001, 0.005, 0.01, and 0.05 mol %/ZnS) was developed to enhance the production of hydrogen from methanol/water splitting. The ZnS particles in a spherical morphology with a diameter of about 2-4 mm which can absorb around 455 nm were prepared by hydrothermal method. This material was used as a photocatalyst with loading by nano-sized TiO2 (20-30 nm) for hydrogen production. The evolution of H2 from methanol/water (1:1) photo splitting over the TiO2/ZnS composite in the liquid system was enhanced, compared with that over pure TiO2 and ZnS. In particular, 1.2 mmol of H2 gas was produced after 12 h when 0.005 mol % TiO2/ZnS nano/micro-composite was used. On the basis of cyclic voltammeter (CV) and UV-visible spectrums results, the high photoactivity was attributed to the larger band gap and the lower LUMO in the TiO2/ZnS composite, due to the decreased recombination between the excited electrons and holes.
Page
2133 - 2139
Full Text
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