Time-Resolved Infrared Absorption Study of NaTaO3 Photocatalysts Doped with Alkali Earth Metals

被引：54

作者：

Maruyama, Motoji ^{[1
]}

Iwase, Akihide ^{[2
]}

Kato, Hideki ^{[2
]}

Kudo, Akihiko ^{[2
]}

Onishi, Hiroshi ^{[1
]}

机构：

[1] Kobe Univ, Dept Chem, Nada Ku, Kobe, Hyogo 6578501, Japan

[2] Tokyo Univ Sci, Dept Chem, Shinjuku Ku, Tokyo 1628601, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 31期

关键词：

PHOTOGENERATED ELECTRONS; VISIBLE-LIGHT; IR ABSORPTION; SPECTROSCOPY; TIO2; PT/TIO2; SURFACE; KINETICS; OXIDATION; DYNAMICS;

D O I：

10.1021/jp903142n

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：

Electron-hole recombination kinetics was observed in NaTaO3 photocatalysts doped with Ca, Sr, Ba, and La using time-resolved infrared absorption. The recombination rate was compared with the ultraviolet light-derived H-2 production rate in the water splitting reaction to estimate the electron-to-H-2 conversion efficiency. The conversion efficiency was sensitive to the nanometer-scale topography of the photocatalyst surface. The particularly high efficiency on the nondoped and 0.5 mol % Sr-doped photocatalysts was related to the flat (100) crystalline surfaces exposed on the photocatalyst particles. The mobility of holes was suggested to be restricted by doping on the basis of a kinetic simulation of the recombination rate.

引用

页码：13918 / 13923

页数：6

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