title: Synthesis and photocatalytic activity of K2CaNaNb3O10, a new Ruddlesden-Popper phase layered perovskite.
abstract: A new three-layer perovskite oxide with the Ruddlesden-Popper (R-P) phase, K2CaNaNb3O10, and its protonated form were synthesised and their photocatalytic performance was compared to that of KCa2Nb3O10or the protonated form with the Dion-Jacobson (D-J) structure in terms of H2and O2evolution. K2CaNaNb3O10exhibited a higher activity for O2evolution than KCa2Nb3O10when IO3-was used as an electron acceptor. However, protonated KCa2Nb3O10worked more efficiently than protonated K2CaNaNb3O10when Fe3+was used as an electron acceptor. In both cases, it is likely that the stronger affinity of water with the interlayer contributed to higher performance. The activity of the D-J material for H2evolution was much lower when 1-propanol was used as an electron donor than when methanol was used. In contrast, the R-P phase exhibited a similar activity regardless of the electron donor. These results indicate that the interlayer space acts as an oxidation site, so that better access of the electron donor to the interlayer is an important factor that enhances photocatalytic activity.
authors.affiliation: Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-2, Ookayama, Meguro-ku, Tokyo 152-8550, Japan. maedak@chem.titech.ac.jp.
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Oshima
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Yokoi
authors.forename: Miharu
authors.initials: M
authors.lastname: Eguchi
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Maeda