Band structure controls of SrTiO3 towards two-step overall water splitting

被引:28
作者
Hara, Shoichi [2 ]
Irie, Hiroshi [1 ,3 ]
机构
[1] Univ Yamanashi, Clean Energy Res Ctr, Kofu, Yamanashi 4008511, Japan
[2] Univ Yamanashi, Interdisciplinary Grad Sch Med & Engn, Special Educ Program Clean Energy, Kofu, Yamanashi 4008511, Japan
[3] CREST, Japan Sci & Technol Agcy, Chiyoda Ku, Tokyo 1020075, Japan
关键词
Hydrogen; Oxygen; Photocatalysis; Sacrificial agent; Light; VISIBLE-LIGHT IRRADIATION; PHOTOCATALYTIC DECOMPOSITION; PHOTOLYSIS; LANTHANUM; HYDROGEN; SYSTEM; O-2; H-2;
D O I
10.1016/j.apcatb.2011.12.042
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We prepared two types of SrTiO3-based photocatalyst powders, Bi,Ga-doped SrTiO3 and In,V-doped SrTiO3. UV-visible reflectance spectra of these powders indicated that their band-gaps remained constant in comparison with that of SrTiO3. In conjunction with the reported band structure control of oxides, our results indicated that Bi,Ga-doped SrTiO3 and In,V-doped SrTiO3 formed isolated mini-bands composed of Bi 6s orbitals in the forbidden band above the valence band, composed of O 2p, and V 3d orbitals below the conduction band, composed of Ti 3d, resulting in the observed visible-light absorption. Utilizing the prepared SrTiO3-based photocatalysts, we established a two-step overall water-splitting system, in which simultaneous liberation of hydrogen and oxygen with a molar ratio of similar to 2:1 was observed in the presence of I- (NaI) under irradiation with UV-containing light. Moreover, visible light contributed the cycling of 1(-)/IO3- redox mediators, resulting in enhanced hydrogen and oxygen liberation when compared to irradiation with UV light alone. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:330 / 335
页数:6
相关论文
共 18 条
[11]   Photocatalyst releasing hydrogen from water - Enhancing catalytic performance holds promise for hydrogen production by water splitting in sunlight. [J].
Maeda, K ;
Teramura, K ;
Lu, DL ;
Takata, T ;
Saito, N ;
Inoue, Y ;
Domen, K .
NATURE, 2006, 440 (7082) :295-295
[12]   Role and Function of Ruthenium Species as Promoters with TaON-Based Photocatalysts for Oxygen Evolution in Two-Step Water Splitting under Visible Light [J].
Maeda, Kazuhiko ;
Abe, Ryu ;
Domen, Kazunari .
JOURNAL OF PHYSICAL CHEMISTRY C, 2011, 115 (07) :3057-3064
[13]   Photocatalytic activity of SrTiO3 codoped with nitrogen and lanthanum under visible light illumination [J].
Miyauchi, M ;
Takashio, M ;
Tobimatsu, H .
LANGMUIR, 2004, 20 (01) :232-236
[14]   New photocatalyst group for water decomposition of RuO2-loaded p-block metal (In, Sn, and Sb) oxides with d10 configuration [J].
Sato, J ;
Saito, N ;
Nishiyama, H ;
Inoue, Y .
JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (26) :6061-6063
[15]   A new photocatalytic water splitting system under visible light irradiation mimicking a Z-scheme mechanism in photosynthesis [J].
Sayama, K ;
Mukasa, K ;
Abe, R ;
Abe, Y ;
Arakawa, H .
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 2002, 148 (1-3) :71-77
[16]   STOICHIOMETRIC PHOTOCATALYTIC DECOMPOSITION OF PURE WATER IN PT/TIO2 AQUEOUS SUSPENSION SYSTEM [J].
TABATA, S ;
NISHIDA, H ;
MASAKI, Y ;
TABATA, K .
CATALYSIS LETTERS, 1995, 34 (1-2) :245-249
[17]   Efficient photocatalytic decomposition of organic contaminants over CaBi2O4 under visible-light irradiation [J].
Tang, JW ;
Zou, ZG ;
Ye, JH .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2004, 43 (34) :4463-4466
[18]   PHOTOLYSIS OF WATER ON ILLUMINATED STRONTIUM TITANIUM TRIOXIDE [J].
YONEYAMA, H ;
KOIZUMI, M ;
TAMURA, H .
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 1979, 52 (11) :3449-3450