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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Photocatalytic hydrogen production from water over m-doped La2Ti2O7 (M = Cr, Fe) under visible light irradiation (lambda > 420 nm)

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Title
Photocatalytic hydrogen production from water over m-doped La2Ti2O7 (M = Cr, Fe) under visible light irradiation (lambda > 420 nm)
Other Titles
Photocatalytic hydrogen production from water over m-doped La2Ti2O7 (M = Cr, Fe) under visible light irradiation (lambda > 420 nm)
Author
Hwang, Dong WonKirn, Hyun GyuLee, Jae SungKim, Jindo KimLi, WeiOh, Se Hyuk
Keywords
RAY-ABSORPTION SPECTROSCOPY; X-RAY; LAYERED PEROVSKITE; TITANIUM-OXIDES; DECOMPOSITION; COMBINATION; OXIDATION; CHROMIUM; SRTIO3; TIO2
Issue Date
2005-02
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY B, v.109, no.6, pp.2093 - 2102
Abstract
In the search for efficient photocatalysts working under visible light, we have investigated the effect of cation substitution on a layered perovskite, La2Ti2O7. Among various metal dopants, only Cr and Fe induced intense absorption of visible light (lambda > 400 nm), and only these catalysts produced H-2 photocatalytically from water in the presence of methanol under visible light irradiation (lambda > 420 nm). The polymerized complex method was found to be more efficient for fabrication of the present catalysts producing a more homogeneous structure than the solid-state reaction. The characterization by XRD, UV-vis DRS, XPS, and XANES revealed that doped Cr and Fe were present in the Cr3+ and Fe3+ states substituting for Ti sites in the La2Ti2O7 lattice. The theoretical calculation indicated that the most significant feature in the electronic band structure of the metal-doped La2Ti2O7 was the formation of a partially filled 3d band in the band gap of La2Ti2O7, while the contribution of these dopants on the valence band was negligible. Excitation of electrons from this localized interband to the conduction band of La2Ti2O7 was responsible for visible light absorption and the H-2 evolution from water under visible light
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DOI
10.1021/jp04932226
ISSN
1520-6106
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ECHE_Journal Papers
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