Articles
  • The co-dopant concentration dependence on visible light photocatalytic efficiency in SrTi1-xFe[x/2]Cr[x/2]O3 (0.01 ≤ x ≤ 0.2) perovskite photocatalysts
  • E. D. Jeonga, S. M. Yua, J. H. Yoona, J. S. Baea, C. R. Chob, K. T. Limc, P. H. Borsed,* and H. G. Kima,*
  • a Busan Center, Korea Basic Science Institute, Busan 609-735, Korea. b Department of Nano Fusion Technology, Pusan National University, Pusan 609-735, Korea c Department of Imaging System Engineering, Pukyong National University, Busan 609-735, Korea. d Solar H2 PEC lab, International Advanced Research Centre for Powder Metallurgy and New Materials (ARC International), Balapur PO, Hyderabad, AP, 500 005, India.
Abstract
We studied the co-dopant (Fe-Cr) concentration dependence on the visible light photocatalytic activity of SrTiO3 for the photodecomposition of gaseous iso-propyl alcohol (IPA), as well as the photo reduction of water. For the first time co-doping of perovskite SrTiO3 is investigated for co-doping with Cr and Fe metal-ions at Ti substitutional site. Undoped SrTiO3, Cr doped SrTiO3, Fe doped SrTiO3 and co-doped SrTi1-xFe[x/2]Cr[x]O4 (0.01 ≤ x ≤ 0.2) were synthesized for the present study. The optimum concentration shows a maximum photodecomposition activity for IPA, as well as photocatalytic hydrogen generation under visible light (λ > 420 nm). The study on the co-dopant concentration optimization was found to be one of the important ways for fabricating an efficient photocatalyst. The optimum co-dopant concentration seems to yield a favorable density of states in the band gap of SrTiO3, which otherwise may lead to recombination centers.

Keywords: SrTiO3, Photocatalyst, Visible light, Hydrogen.

This Article

  • 2012; 13(5): 517-522

    Published on Oct 31, 2012