人工光合成のための光触媒材料の開発

掺杂金属阳离子的二氧化钛和钛酸锶对含牺牲剂的水溶液中的H_2或O_2的析出有可见光响应。可见光响应是由掺杂形成的施主能级向主体光催化剂导带的电子跃迁所致。共掺杂有效地补偿了过渡金属离子掺杂带来的电荷不平衡，从而改善了光催化反应的可见光响应。在过渡金属掺杂的光催化剂中，掺杂Rh的SrTiO3(SrTiO3：Rh)是一种在可见光照射下产生氢气的新型金属氧化物光催化剂。Ag_3VO_4，Ag_&lt；0.5&gt；Pr_&lt；0.5&gt；TiO_3和SnNb_2O_6也是通过平衡带控制的能带工程得到的。利用可见光驱动的光催化剂和Fe^-lt；3+-gt；/Fe^&lt；2+&gt；电子接力，构建了Z-型光催化体系，实现了可见光照射下水的整体分解。此外，通过将硫化锌与窄禁带半导体形成固溶体，开发了高效的硫化物光催化剂来生产太阳能氢气。

Metal cation doping into TiO_2, and SrTiO_3 gave visible light responses for H_2 or O_2 evolution from aqueous solutions containing of sacrificial reagents. The visible light responses were due to the electronic transition from donor levels formed with dopants to conduction bands of the host photocatalysts. Codoping was effective to compensate charge unbalance brought by doping of transition metal cations, resulting in the improvement of visible light response for photocatalytic reactions. Among the transition metal-doped photocatalysts, SrTiO_3 doped with Rh (SrTiO_3:Rh) was the novel metal oxide photocatalyst that produced H_2 under visible light irradiation. Ag_3VO_4, Ag_<0.5>Pr_<0.5>TiO_3, and SnNb_2O_6 were also developed by band engineering of a balance band control. Overall water splitting under visible light irradiation has been achieved by construction of a Z-scheme photocatalysis system employing visible-light-driven photocatalysts for H_2 and O_2 evolution, and an Fe^<3+>/Fe^<2+> redox couple as an electron relay. Moreover, highly efficient sulfide photocatalysts for production of solar hydrogen was developed by making solid solutions of ZnS with narrow band gap semiconductors.