Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan.
Chemistry. 2018 Dec 10;24(69):18204-18219. doi: 10.1002/chem.201800799. Epub 2018 Jun 6.
Water splitting using a semiconductor photocatalyst with sunlight has long been viewed as a potential means of large-scale H production from renewable resources. Different from anatase TiO , rutile enables preferential water oxidation, which is useful for the construction of a Z-scheme water-splitting system. The combination of rutile TiO with a suitable H -evolution photocatalyst such as a Pt-loaded BaZrO -BaTaO N solid solution enables solar-driven water splitting into H and O . While rutile TiO is a wide-gap semiconductor with a bandgap of 3.0 eV, co-doping of rutile TiO with certain metal ions and/or nitrogen produces visible-light-driven photocatalysts, which are also useful as a component for water oxidation in visible-light-driven Z-scheme water splitting. The key to achieving highly efficient water oxidation is to maintain a charge balance of dopants in the rutile, because single doping typically produces trap states that capture photogenerated electrons and/or holes. Here we provide a concise summary of rutile TiO -based photocatalysts for water-splitting systems.
利用半导体光催化剂分解水，利用阳光将其视为从可再生资源中大规模生产氢气的一种潜在手段，这一想法由来已久。与锐钛矿 TiO 不同，金红石型 TiO 能够优先进行水氧化，这对于构建 Z 型水分解系统非常有用。将金红石 TiO 与合适的析氢光催化剂（如负载 Pt 的 BaZrO -BaTaO N 固溶体）结合使用，可以实现太阳能驱动的水分解为 H 和 O 。虽然金红石 TiO 是一种带隙为 3.0 eV 的宽禁带半导体，但金红石 TiO 的某些金属离子和/或氮共掺杂会产生可见光驱动的光催化剂，这也可用作可见光驱动 Z 型水分解中水氧化的组件。实现高效水氧化的关键是保持金红石中掺杂剂的电荷平衡，因为单一掺杂通常会产生陷阱态，捕获光生电子和/或空穴。在这里，我们对用于水分解系统的基于金红石 TiO 的光催化剂进行了简要总结。
