期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 275, 期 -, 页码 65-71出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2013.10.014
关键词
SrTiO3; Codoping; Visible light; Solar hydrogen production
资金
- National Basic Research Program of China (973 Program) [2013CB632404]
- National Natural Science Foundation of China [51102132, 11174129, 51272101, 51272102]
Cr,B-codoped-SrTiO3 was successfully synthesized by one-step hydrothermal method. XRD, FTIR, Raman and XPS results showed that B existed in the forms of both substitutional B for 0 and interstitial B in the bulk of SrTiO3. UV-Vis absorption spectra showed that Cr,B-codoped-SrTiO3 had strong visible light absorption and small band gap (2.07 eV). Theoretical calculation pointed out that the strong p-d repulsion of substitutional B 2p with Cr 3d was responsible for the narrowing of band gap and enhanced visible light absorption. Our results indicate that the codoping of Cr and B offers a novel route to modify the light response of SrTiO3. The photocatalytic activity for hydrogen production over Cr,B-codoped SrTiO3 photocatalyst is 15.4 mu mol/h, which is higher than that over Cr-doped SrTiO3 (9.3 mu mol/h) synthesized by the similar method. The higher activity for Cr,B-codoped SrTiO3 is attributed to its smaller band gap than Cr-doped SrTiO3. (C) 2013 Elsevier B.V. All rights reserved.
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