Issue 44, 2008
From the journal:

Physical Chemistry Chemical Physics

Correlation between the band positions of (SrTiO3)1−x·(LaTiO2N)x solid solutions and photocatalytic properties under visible light irradiation†

Wenjun Luo,ab   Zhaosheng Li,*abc   Xiaojun Jiang,ab   Tao Yu,ac   Lifei Liu,a   Xinyi Chen,a   Jinhua Yead  and  Zhigang Zou*ac  

* Corresponding authors

a Ecomaterials and Renewable Energy Research Center (ERERC), Department of Physics, Nanjing University, Nanjing, P.R. China
E-mail: zsli@nju.edu.cn; zgzou@nju.edu.cn
Fax: +86-25-83686632

b Department of Materials Science and Engineering, Nanjing University, Nanjing, P.R. China

c National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, P.R. China

d Photocatalytic Materials Center, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki, Japan

Abstract

N-doped SrTiO3 and (SrTiO3)1−x·(LaTiO2N)x samples were prepared by the thermal ammonolysis method. The photocatalytic activities of the samples were investigated in a water suspension system. Aqueous methanol solution (50 mL CH3OH + 220 mL H2O) for H2 evolution and aqueous silver nitrate solution (270 mL, 0.01 mol L−1) for O2 evolution were used as sacrificial reagents. The oxynitrides showed photocatalytic activities under visible light irradiation. The maximum rates of photocatalytic hydrogen and oxygen evolution under visible light irradiation (λ > 420 nm) were 10 and 8 μmol h−1, respectively. The samples were characterized by X-ray diffractometry, UV-Vis spectrophotometry, Fourier transform infrared spectrometry, and laser Raman spectroscopy. The unit cell edge length of (SrTiO3)1−x·(LaTiO2N)x increased linearly and their band gaps reduced from 3.18 to 2.04 eV with increasing x from 0 to 0.30. Moreover, the calculation results of (SrTiO3)0.75·(LaTiO2N)0.25 by density functional theory suggested that the band gap narrowing of the solid solutions came from the hybridization of N2p and O2p orbital. The band positions of the solid solutions were further investigated by Mott-Schottky and the onset potential method. The results suggested that the conduction band of the solid solution was lowered, which led to decrement of the hydrogen evolution rate.

Graphical abstract: Correlation between the band positions of (SrTiO3)1−x·(LaTiO2N)x solid solutions and photocatalytic properties under visible light irradiation

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Article information

DOI
https://doi.org/10.1039/B803996H
Article type
Paper
Submitted
07 Mar 2008
Accepted
05 Aug 2008
First published
25 Sep 2008

Phys. Chem. Chem. Phys., 2008,10, 6717-6723

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Correlation between the band positions of (SrTiO3)1−x·(LaTiO2N)x solid solutions and photocatalytic properties under visible light irradiation

W. Luo, Z. Li, X. Jiang, T. Yu, L. Liu, X. Chen, J. Ye and Z. Zou, Phys. Chem. Chem. Phys., 2008, 10, 6717 DOI: 10.1039/B803996H

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