Abstract
Abstract Cr,B-codoped-SrTiO 3 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 O and interstitial B in the bulk of SrTiO 3 . UV-Vis absorption spectra showed that Cr,B-codoped-SrTiO 3 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 SrTiO 3 . The photocatalytic activity for hydrogen production over Cr,B-codoped SrTiO 3 photocatalyst is 15.4 μmol/h, which is higher than that over Cr-doped SrTiO 3 (9.3 μmol/h) synthesized by the similar method. The higher activity for Cr,B-codoped SrTiO 3 is attributed to its smaller band gap than Cr-doped SrTiO 3 .
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