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

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• 作者：Hironori Fujito ; Hironobu Kunioku ; Daichi Kato ; Hajime Suzuki ; Masanobu Higashi ; Hiroshi Kageyama ; Ryu Abe
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：February 24, 2016
• 年：2016
• 卷：138
• 期：7
• 页码：2082-2085
• 全文大小：298K
• ISSN：1520-5126

文摘

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.