Electronic structure and photocatalytic water splitting of lanthanum-doped Bi2AlNbO7

被引：31

作者：

Li, Yingxuan ^{[1
]}

Chen, Gang ^{[1
]}

Zhang, Hongjie ^{[1
]}

Li, Zhonghua ^{[1
]}

机构：

[1] Harbin Inst Technol, Dept Appl Chem, Harbin 150001, Peoples R China

来源：

MATERIALS RESEARCH BULLETIN | 2009年 / 44卷 / 04期

关键词：

Semiconductors; Infrared spectroscopy; Catalytic properties; DECOMPOSITION; LA; PROPERTY;

D O I：

10.1016/j.materresbull.2008.09.020

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Bi2-xLaxAlNbO7 (0 <= x <= 0.5) photocatalysts were synthesized by the solid-state reaction method and characterized by powder X-ray diffraction (XRD), infrared (IR) spectra and ultraviolet-visible (UV-vis) spectrophotometer. The band gaps of the photocatalysts were estimated from absorption edge of diffuse reflectance spectra, which were increased by the doping of lanthanum. It was found from the electronic band structure study that orbitals of La 5d, Bi 6p and Nb 4d formed a conduction band at a more positive level than Bi 6p and Nb 4d orbitals, which results in increasing the band gap. Photocatalytic activity for water splitting of Bi1.8La0.2AlNbO7 was about 2 times higher than that of noncloped Bi2AlNbO7. The increased photocatalytic activity of La-doped Bi2AlNbO7 was discussed in relation to the band structure and the strong absorption of OH groups at the surface of the catalyst. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：741 / 746

页数：6

共 22 条

[1]

BAZUEV GV, 1985, RUSS J INORG CHEM, V30, P1253

[2] STUDY OF THE PHOTOCATALYTIC DECOMPOSITION OF WATER-VAPOR OVER A NIO-SRTIO3 CATALYST [J].

DOMEN, K ;

NAITO, S ;

ONISHI, T ;

TAMARU, K .

JOURNAL OF PHYSICAL CHEMISTRY, 1982, 86 (18) :3657-3661

[3] MECHANISM OF PHOTOCATALYTIC DECOMPOSITION OF WATER INTO H-2 AND O-2 OVER NIO - SRTIO3 [J].

DOMEN, K ;

KUDO, A ;

ONISHI, T .

JOURNAL OF CATALYSIS, 1986, 102 (01) :92-98

[4] HETEROGENEOUS PHOTOCATALYSIS [J].

FOX, MA ;

DULAY, MT .

CHEMICAL REVIEWS, 1993, 93 (01) :341-357

[5] ELECTROCHEMICAL PHOTOLYSIS OF WATER AT A SEMICONDUCTOR ELECTRODE [J].

FUJISHIMA, A ;

HONDA, K .

NATURE, 1972, 238 (5358) :37-+

[6] INHOMOGENEOUS ELECTRON-GAS [J].

RAJAGOPAL, AK ;

CALLAWAY, J .

PHYSICAL REVIEW B, 1973, 7 (05) :1912-1919

[7] The induced phase transformation and oxygen vacancy relaxation in La-modified bismuth titanate ceramics [J].

Jiang, AQ ;

Hu, ZX ;

Zhang, LD .

APPLIED PHYSICS LETTERS, 1999, 74 (01) :114-116

[8] Effect of lanthanide-doping into NaTaO3 photocatalysts for efficient water splitting [J].

Kudo, A ;

Kato, H .

CHEMICAL PHYSICS LETTERS, 2000, 331 (5-6) :373-377

[9] UNIVERSAL VARIATIONAL FUNCTIONALS OF ELECTRON-DENSITIES, 1ST-ORDER DENSITY-MATRICES, AND NATURAL SPIN-ORBITALS AND SOLUTION OF THE V-REPRESENTABILITY PROBLEM [J].

LEVY, M .

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1979, 76 (12) :6062-6065

[10] Electronic structure and visible light photocatalysis water splitting property of chromium-doped SrTiO3 [J].

Liu, J. W. ;

Chen, G. ;

Li, Z. H. ;

Zhang, Z. G. .

JOURNAL OF SOLID STATE CHEMISTRY, 2006, 179 (12) :3704-3708

← 1 2 3 →