Photocatalytic decomposition of water-methanol solution over metal-doped layered perovskites under visible light irradiation
SCIE
SCOPUS
- Title
- Photocatalytic decomposition of water-methanol solution over metal-doped layered perovskites under visible light irradiation
- Authors
- Hwang, DW; Kim, HG; Jang, JS; Bae, SW; Ji, SM; Lee, JS
- Date Issued
- 2004-09-01
- Publisher
- ELSEVIER SCIENCE BV
- 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.
- Keywords
- water splitting; photocatalysts; visible light; perovskites; band structure; OXIDATION; LA2TI2O7; CHROMIUM; SRTIO3; H-2; O-2; NM
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/17711
- DOI
- 10.1016/j.cattod.2004.06.084
- ISSN
- 0920-5861
- Article Type
- Article
- Citation
- CATALYSIS TODAY, vol. 5-93, page. 845 - 850, 2004-09-01
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