Elucidation of Rh-induced In-gap states of Rh:SrTiO3 visible-light-driven photocatalyst by soft X-ray spectroscopy and first-principles calculations

Seiji Kawasaki, Kazuto Akagi, Kan Nakatsuji, Susumu Yamamoto, Iwao Matsuda, Yoshihisa Harada, Jun Yoshinobu, Fumio Komori, Ryota Takahashi, Mikk Lippmaa, Chikako Sakai, Hideharu Niwa, Masaharu Oshima, Katsuya Iwashina, Akihiko Kudo

研究成果: Article査読

66 被引用数 (Scopus)


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 H2-evolving photocatalyst in a solar water splitting reaction.

ジャーナルJournal of Physical Chemistry C
出版ステータスPublished - 2012 11 26

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜


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