title: Overall water splitting on (Ga(1-x)Zn(x))(N(1-x)O(x)) solid solution photocatalyst: relationship between physical properties and photocatalytic activity.
abstract: The physical and photocatalytic properties of a novel solid solution between GaN and ZnO, (Ga(1-x)Zn(x))(N(1-x)O(x)), are investigated. Nitridation of a mixture of Ga(2)O(3) and ZnO at 1123 K for 5-30 h under NH(3) flow results in the formation of a (Ga(1-x)Zn(x))(N(1-x)O(x)) solid solution with x = 0.05-0.22. With increasing nitridation time, the zinc and oxygen concentrations decrease due to reduction of ZnO and volatilization of zinc, and the crystallinity and band gap energy of the product increase. The highest activity for overall water splitting is obtained for (Ga(1-x)Zn(x))(N(1-x)O(x)) with x = 0.12 after nitridation for 15 h. The crystallinity of the catalyst is also found to increase with increasing the ratio of ZnO to Ga(2)O(3) in the starting material, resulting in an increase in activity.
authors.affiliation: Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Maeda
authors.forename: Kentaro
authors.initials: K
authors.lastname: Teramura
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Takata
authors.forename: Michikazu
authors.initials: M
authors.lastname: Hara
authors.forename: Nobuo
authors.initials: N
authors.lastname: Saito
authors.forename: Kenji
authors.initials: K
authors.lastname: Toda
authors.forename: Yasunobu
authors.initials: Y
authors.lastname: Inoue
authors.forename: Hisayoshi
authors.initials: H
authors.lastname: Kobayashi
authors.forename: Kazunari
authors.initials: K
authors.lastname: Domen