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Enhanced photocatalytic production of H-2 on mesoporous TiO2 prepared by template-free method: Role of interparticle charge transfer SCIE SCOPUS

Title
Enhanced photocatalytic production of H-2 on mesoporous TiO2 prepared by template-free method: Role of interparticle charge transfer
Authors
Lakshminarasimhan, NBae, EChoi, W
Date Issued
2007-10-25
Publisher
AMER CHEMICAL SOC
Abstract
Efficient charge separation and transport are important factors in achieving high efficiency in TiO2 photocatalysis and dye-sensitized TiO2 applications. Mesoporous TiO2 (meso-TiO2) consisting of compactly packed nanoparticles can be a promising candidate for such purposes. In the present study, meso-TiO2 exhibiting an enhanced photocatalytic activity for H, evolution was synthesized by a simple and facile, template-free nonhydrothermal method. The photocatalytic activity for H-2 evolution of meso-TiO2 was the highest compared to nonporous colloidal-TiO2 and commercial Degussa P25 (P25) and Hombikat UV-100 (HBK) samples. The highest activity of meso-TiO2 was further supported by photocurrent generation and photoluminescence. Under visible light irradiation, the dye-sensitized TiO2 system also exhibited a higher activity for H-2 production with meso-TiO2 compared with colloidal -TiO2. The activity of meso-TiO2 exhibited a unique dependence on Pt cocatalyst loading. Under both UV and visible light irradiation, the highest activity for H-2 production was obtained around 0.1 wt % Pt and further increase reduced the activity, whereas other nonporous TiC, samples exhibited a typical saturation behavior with increasing Pt load. The enhanced photocatalytic activity of meso-TiO2, is ascribed to the compact and dense packing of TiO2 nanoparticles forming a uniform agglomerate, which enables efficient charge separation through interparticle charge transfer. Finally, the present simple synthesis method we developed is advantageous over other methods because it eliminates the use of templates and a hydrothermal process, which is highly favored for the scale-up production of the meso-TiO2 photocatalyst.
Keywords
SENSITIZED SOLAR-CELLS; TITANIUM-DIOXIDE; ENVIRONMENTAL APPLICATIONS; HYDROGEN-PRODUCTION; VISIBLE-LIGHT; HIGH-PURITY; HYDROLYSIS; FILMS; WATER; TETRAETHOXIDE
URI
https://oasis.postech.ac.kr/handle/2014.oak/23105
DOI
10.1021/JP0752724
ISSN
1932-7447
Article Type
Article
Citation
JOURNAL OF PHYSICAL CHEMISTRY C, vol. 111, no. 42, page. 15244 - 15250, 2007-10-25
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최원용CHOI, WONYONG
Div of Environmental Science & Enginrg
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