Layered Perovskite Oxychloride Bi4NbO8Cl: A Stable Visible Light Responsive Photocatalyst for Water Splitting

Hironori Fujito, Hironobu Kunioku, Daichi Kato, Hajime Suzuki, Masanobu Higashi, Hiroshi Kageyama, Ryu Abe

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179 Citations (Scopus)

Abstract

Mixed anion compounds are expected to be a photocatalyst for visible light-induced water splitting, but the available materials have been almost limited to oxynitrides. Here, we show that an oxychrolide Bi4NbO8Cl, a single layer Sillen-Aurivillius perovskite, is a stable and efficient O2-evolving photocatalyst under visible light, enabling a Z-scheme overall water splitting by coupling with a H2-evolving photocatalyst (Rh-doped SrTiO3). It is found that the valence band maximum of Bi4NbO8Cl is unusually high owing to highly dispersive O-2p orbitals (not Cl-3p orbitals), affording the narrow band gap and possibly the stability against water oxidation. This study suggests that a family of Sillen-Aurivillius perovskite oxyhalides is a promising system to allow a versatile band level tuning for establishing efficient and stable water-splitting under visible light.

Original languageEnglish
Pages (from-to)2082-2085
Number of pages4
JournalJournal of the American Chemical Society
Volume138
Issue number7
DOIs
Publication statusPublished - 2 Mar 2016
Externally publishedYes

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