Maeda Kazuhiko
Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology , 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo 152-8550, Japan.
ACS Appl Mater Interfaces. 2014 Feb 12;6(3):2167-73. doi: 10.1021/am405293e. Epub 2014 Jan 23.
Rhodium-doped barium titanate (BaTiO3:Rh) powder was prepared by the polymerized complex (PC) method, and the photocatalytic activity for H2 evolution from water was examined. BaTiO3 is a wide-gap n-type semiconductor having a band gap of 3.0 eV. Doping Rh species into the lattice of BaTiO3 resulted in the formation of new absorption bands in visible light region. Upon visible light (λ > 420 nm), BaTiO3:Rh modified with nanoparticulate Pt as a water reduction promoter was capable of producing H2 from water containing an electron donor such as methanol and iodide. The best material prepared by the PC method exhibited higher activity than that made by a conventional solid-state reaction method. Visible-light-driven Z-scheme water splitting was also accomplished using Pt/BaTiO3:Rh as a building block for H2 evolution in combination with PtOx-loaded WO3 as an O2 evolution photocatalyst in the presence of an IO3(-)/I(-) shuttle redox mediator. Photoelectrochemical analysis indicated that a porous BaTiO3:Rh electrode exhibited cathodic photoresponse due to water reduction in a neutral aqueous Na2SO4 solution upon visible light.
采用聚合络合物（PC）法制备了铑掺杂钛酸钡（BaTiO₃:Rh）粉末，并对其从水中析氢的光催化活性进行了研究。BaTiO₃是一种带隙为3.0 eV的宽禁带n型半导体。向BaTiO₃晶格中掺杂Rh物种导致在可见光区域形成新的吸收带。在可见光（λ > 420 nm）照射下，用纳米颗粒Pt作为水还原促进剂修饰的BaTiO₃:Rh能够从含有甲醇和碘化物等电子供体的水中产生H₂。通过PC法制备的最佳材料表现出比传统固态反应法制备的材料更高的活性。在IO₃⁻/I⁻穿梭氧化还原介质存在的情况下，使用Pt/BaTiO₃:Rh作为析氢的构建单元与负载PtOx的WO₃作为析氧光催化剂相结合，还实现了可见光驱动的Z型水分解。光电化学分析表明，在可见光照射下，多孔BaTiO₃:Rh电极在中性Na₂SO₄水溶液中由于水还原而表现出阴极光响应。
