title: Topotactic Epitaxy of SrTiO3Mesocrystal Superstructures with Anisotropic Construction for Efficient Overall Water Splitting.
abstract: The higher-order structures of semiconductor-based photocatalysts play crucial roles in their physicochemical properties for efficient light-to-energy conversion. A novel perovskite SrTiO3mesocrystal superstructure with well-defined orientation of assembled cubic nanocrystals was synthesized by topotactic epitaxy from TiO2mesocrystals through a facile hydrothermal treatment. The SrTiO3mesocrystal exhibits three times the efficiency for the hydrogen evolution of conventional disordered systems in alkaline aqueous solution. It also exhibits a high quantum yield of 6.7 % at 360 nm in overall water splitting and even good durability up to 1 day. Temporal and spatial spectroscopic observations revealed that the synergy of the efficient electron flow along the internal nanocube network and efficient collection at the larger external cubes produces remarkably long-lived charges for enhanced photocatalysis.
authors.affiliation: The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka, 567-0047, Japan.
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, 657-8501, Japan.
authors.forename: Tomoya
authors.initials: T
authors.lastname: Ochi
authors.affiliation: The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka, 567-0047, Japan.
authors.forename: Mamoru
authors.identifier: 0000-0002-2336-4355
authors.initials: M
authors.lastname: Fujitsuka
authors.affiliation: Department of Chemistry, Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, 657-8501, Japan.|Molecular Photoscience Research Center, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, 657-8501, Japan.
authors.forename: Yasuhiro
authors.identifier: 0000-0001-8370-9362
authors.initials: Y
authors.lastname: Kobori
authors.affiliation: The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka, 567-0047, Japan.
authors.forename: Tetsuro
authors.identifier: 0000-0003-1805-1677
authors.initials: T
authors.lastname: Majima
authors.affiliation: Department of Chemistry, Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, 657-8501, Japan.|Molecular Photoscience Research Center, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, 657-8501, Japan.|PRESTO, Science and Technology Agency (JST), 24-1-8 Honcho Kawaguchi, Saitama, 332-0012, Japan.
authors.forename: Takashi
authors.identifier: 0000-0001-6465-5792
authors.initials: T
authors.lastname: Tachikawa
keywords: interfacial charge transfer; mesocrystals; photocatalysis; superstructure; water splitting