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

Dong Won Hwang; Hyun Gyu Kim; Jum Suk Jang; Sang Won Bae; Sang Min Ji; Jae Sung Lee

doi:10.1016/j.cattod.2004.06.084

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

Dong Won Hwang
, Hyun Gyu Kim
, Jum Suk Jang
, Sang Won Bae
, Sang Min Ji
, Jae Sung Lee^*

^*Corresponding author for this work

Environmental Biotechnology

Pohang University of Science and Technology

Research output: Contribution to journal › Conference article › peer-review

96 Scopus citations

Abstract

In search for efficient photocatalysts for water splitting under visible light, the effect of cation substitution on a layered perovskite, La ₂Ti₂O₇ has been studied_. Among various types of dopants, only Cr and Fe showed intense absorption in the visible light region (λ>420nm), over which H₂ 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 2.6eV, respectively, and the H₂ 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.

Original language	English
Pages (from-to)	845-850
Number of pages	6
Journal	Catalysis Today
Volume	93-95
DOIs	https://doi.org/10.1016/j.cattod.2004.06.084
State	Published - 2004.09.1
Event	Selections from the Presentations of the 3rd Asia-Pacific Congress - Dalian, China Duration: 2003.10.12 → 2003.10.12

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

Band structure
Perovskites
Photocatalysts
Visible light
Water splitting

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10.1016/j.cattod.2004.06.084

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@article{0453300638c04e3bb8cdde608b5a3cc7,

title = "Photocatalytic decomposition of water-methanol solution over metal-doped layered perovskites under visible light irradiation",

abstract = "In search for efficient photocatalysts for water splitting under visible light, the effect of cation substitution on a layered perovskite, La 2Ti2O7 has been studied. Among various types of dopants, only Cr and Fe showed intense absorption in the visible light region (λ>420nm), over which H2 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 2.6eV, respectively, and the H2 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.",

keywords = "Band structure, Perovskites, Photocatalysts, Visible light, Water splitting",

author = "Hwang, \{Dong Won\} and Kim, \{Hyun Gyu\} and Jang, \{Jum Suk\} and Bae, \{Sang Won\} and Ji, \{Sang Min\} and Lee, \{Jae Sung\}",

year = "2004",

month = sep,

day = "1",

doi = "10.1016/j.cattod.2004.06.084",

language = "English",

volume = "93-95",

pages = "845--850",

journal = "Catalysis Today",

issn = "0920-5861",

note = "Selections from the Presentations of the 3rd Asia-Pacific Congress ; Conference date: 12-10-2003 Through 12-10-2003",

}

TY - JOUR

T1 - Photocatalytic decomposition of water-methanol solution over metal-doped layered perovskites under visible light irradiation

AU - Hwang, Dong Won

AU - Kim, Hyun Gyu

AU - Jang, Jum Suk

AU - Bae, Sang Won

AU - Ji, Sang Min

AU - Lee, Jae Sung

PY - 2004/9/1

Y1 - 2004/9/1

N2 - In search for efficient photocatalysts for water splitting under visible light, the effect of cation substitution on a layered perovskite, La 2Ti2O7 has been studied. Among various types of dopants, only Cr and Fe showed intense absorption in the visible light region (λ>420nm), over which H2 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 2.6eV, respectively, and the H2 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.

AB - In search for efficient photocatalysts for water splitting under visible light, the effect of cation substitution on a layered perovskite, La 2Ti2O7 has been studied. Among various types of dopants, only Cr and Fe showed intense absorption in the visible light region (λ>420nm), over which H2 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 2.6eV, respectively, and the H2 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.

KW - Band structure

KW - Perovskites

KW - Photocatalysts

KW - Visible light

KW - Water splitting

UR - https://www.scopus.com/pages/publications/4344671740

U2 - 10.1016/j.cattod.2004.06.084

DO - 10.1016/j.cattod.2004.06.084

M3 - Conference article

AN - SCOPUS:4344671740

SN - 0920-5861

VL - 93-95

SP - 845

EP - 850

JO - Catalysis Today

JF - Catalysis Today

T2 - Selections from the Presentations of the 3rd Asia-Pacific Congress

Y2 - 12 October 2003 through 12 October 2003

ER -

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

Abstract

UN SDGs

Keywords

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