title: Photocatalytic Water Oxidation over Metal Oxide Nanosheets Having a Three-Layer Perovskite Structure.
abstract: Metal oxide nanosheets having a three-layer perovskite structure were studied as photocatalysts for water oxidation in the presence of IO3 (-) as a reversible electron acceptor. This work examined the effects of the lateral dimensions and composition of the nanosheets as well as metal oxide co-catalysts deposited on the restacked nanosheets. Depositing metal oxides capable of promoting reduction reactions on the nanosheets were found to promote the water oxidation activity. In contrast, the lateral dimensions and the degree of crystallinity of the nanosheets had little effect on the activity. Experimental results demonstrated that the reduction of IO3 (-) is the rate-limiting step in this reaction and that nanosheets with less distorted structures are advantageous with regard to increasing both light absorption and the mobility of photoexcited charge carriers.
authors.affiliation: 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.
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Oshima
authors.affiliation: Electronic Functional Materials Group, Polymer Materials Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.
authors.forename: Miharu
authors.initials: M
authors.lastname: Eguchi
authors.affiliation: 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. maedak@chem.titech.ac.jp.
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Maeda
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D002384:Catalysis; D008670:Metals / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D015394:Molecular Structure; D049329:Nanostructures; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D055668:Photochemical Processes; D014025:Titanium / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D008670:Metals; D010087:Oxides; D014867:Water; C059910:perovskite; D014025:Titanium
keywords: heterogeneous catalysis; nanosheets; photocatalysis; semiconductors; water splitting