Band gap tuning of Na1-xLaxTa1-xCoxO3 solid solutions for visible light photocatalysis

被引：67
|
作者：
Yi, Z. G. [1 ]
Ye, J. H. [1 ]
机构：
[1] Natl Inst Mat Sci, Photocatalyt Mat Ctr, Tsukuba 3050047, Japan
来源：
APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 25期
基金：
日本学术振兴会;
关键词：
D O I：
10.1063/1.2826277
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Monophase solid solutions Na1-xLaxTa1-xCoxO3 (x=0-0.25) were prepared with conventional solid state reactions method. The band gaps of the solid solutions can be tuned to effectively absorb visible light, with varying x value. The Na0.9La0.1Ta0.9Co0.1O3 photocatalyst exhibited the highest performance of H-2 evolution (4.34 mu mol/h) under visible light irradiation (lambda>420 nm), whereas no H-2 evolution is observed for NaTaO3 under the same conditions. The first principles calculation using generalized gradient approximation revealed that the band gap alteration and the photocatalytic activities of Na1-xLaxTa1-xCoxO3 are mainly due to the hybridization of Co 3d and O 2p orbitals. (C) 2007 American Institute of Physics.
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页数：3
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