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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 decomposition of water-methanol solution over metal-doped layered perovskites under visible light irradiation

Cited 73 times inthomson ciCited 72 times inthomson ci
Title
Photocatalytic decomposition of water-methanol solution over metal-doped layered perovskites under visible light irradiation
Other Titles
Photocatalytic decomposition of water-methanol solution over metal-doped layered perovskites under visible light irradiation
Author
Hwang, Dong WonKim, Hyun GyuJang, Jum SukBae, Sang WonJi, Sang MinLee, Jae Sung
Keywords
water splitting; photocatalysts; visible light; perovskites; band structure
Issue Date
2004-09
Publisher
ELSEVIER SCIENCE BV
Citation
CATALYSIS TODAY, v.93-5, no., pp.845 - 850
Abstract
In search for efficient photocatalysts for water splitting under visible light, the effect of cation substitution on a layered perovskite, La2Ti2O7 has been studied Among various types of dopants, only Cr and Fe showed intense absorption in the visible light region (lambda > 420 nm), over which H-2 was produced photocatalytically from water-methanol solution. XPS measurements indicated that the oxidation state of doped Cr and Fe was +3. The band gap energies of Cr and Fe-doped La2Ti2O7 were 2.2 and 2.6 eV, respectively, and the H-2 evolution rate was a little higher for the Cr-doped catalyst than that for the Fe-doped one. The theoretical calculation of electronic band structure revealed that the contribution of these dopants on the overall band structure of La2Ti2O7 was negligible, but that they formed a partially filled 3d band in the band gap of La2Ti2O7, from which photoelectrons are excited to the conduction band upon visible light absorption. (C) 2004 Elsevier B.V. All rights reserved
URI
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DOI
10.1016/j.cattod.2004.06.084
ISSN
0920-5861
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ECHE_Journal Papers
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