Elucidation of Rh-Induced In-Gap States of Rh:SrTiO3 Visible-Light-Driven Photocatalyst by Soft X-ray Spectroscopy and First-Principles Calculations

被引：100

作者：

Kawasaki, Seiji ^{[1
]}

Akagi, Kazuto ^{[2
]}

Nakatsuji, Kan ^{[1
]}

Yamamoto, Susumu ^{[1
]}

Matsuda, Iwao ^{[1
]}

Harada, Yoshihisa ^{[1
]}

Yoshinobu, Jun ^{[1
]}

Komori, Fumio ^{[1
]}

Takahashi, Ryota ^{[1
]}

Lippmaa, Mikk ^{[1
]}

Sakai, Chikako ^{[3
]}

Niwa, Hideharu ^{[3
]}

Oshima, Masaharu ^{[3
]}

Iwashina, Katsuya ^{[4
]}

Kudo, Akihiko ^{[4
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan

[2] Tohoku Univ, WPI AIMR, Sendai, Miyagi 9808577, Japan

[3] Univ Tokyo, Sch Engn, Dept Appl Chem, Tokyo 1138656, Japan

[4] Tokyo Univ Sci, Fac Sci, Tokyo 1628601, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2012年 / 116卷 / 46期

关键词：

DOPED SRTIO3; WATER; SYSTEMS;

D O I：

10.1021/jp3082529

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

The occupied and unoccupied in-gap electronic states of a Rh-doped SrTiO3 photocatalyst were investigated by X-ray emission spectroscopy and X-ray absorption spectroscopy for different Rh impurity valence states and doping levels. An unoccupied midgap Rh4+ acceptor state was found 1.5 eV below the SrTiO3 conduction band minimum. Both Rh4+ and Rh3+ dopants were found to have an occupied donor level close to the valence band maximum of SrTiO3. The density of states obtained from first-principles calculations show that all observed spectral features can be assigned to electronic states Of substitutional Rh at the Ti site and that Rh:SrTiO3 is an unusual titanate compound with a characteristic p-type, electronic structure. The Rh doping results in a large decrease of the bandgap energy, making Rh:SrTiO3 an attractive material for use as a visible-light-driven H-2-evolving photocatalyst in a solar water splitting reaction.

引用

页码：24445 / 24448

页数：4

共 28 条

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OPTICAL PROPERTIES AND BAND STRUCTURE OF SRTIO3 AND BATIO3 [J].