期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 138, 期 7, 页码 2082-2085出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b11191
关键词
-
资金
- Core Research for Evolutional Science and Technology (CREST) from the Japan Science and Technology Agency (JST)
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 O-2-evolving photocatalyst under visible light, enabling a Z-scheme overall water splitting by coupling with a H-2-evolving photocatalyst (Rh-doped SrTiO3). It is found that the valence band maximum of Bi(4)NbO(8)Clis 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.
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