Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Improved Photolysis of Water from Ti Incorporated Double Perovskite Sr2FeNbO6 Lattice

  • Borse, P.H. (Solar H2 PEC Laboratory, International Advanced Research Center for Powder Metallurgy and New Materials(ARC International)) ;
  • Cho, C.R. (Department of Nano Fusion Technology, Pusan National University) ;
  • Yu, S.M. (Division of High Technology Materials Research, Korea Basic Science Institute) ;
  • Yoon, J.H. (Division of High Technology Materials Research, Korea Basic Science Institute) ;
  • Hong, T.E. (Division of High Technology Materials Research, Korea Basic Science Institute) ;
  • Bae, J.S. (Division of High Technology Materials Research, Korea Basic Science Institute) ;
  • Jeong, E.D. (Division of High Technology Materials Research, Korea Basic Science Institute) ;
  • Kim, H.G. (Division of High Technology Materials Research, Korea Basic Science Institute)
  • Received : 2012.04.26
  • Accepted : 2012.07.26
  • Published : 2012.10.20
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Abstract

The Ti incorporation at Fe-site in the double perovskite lattice of $Sr_2FeNbO_6$ (SFNO) system is studied. The Ti concentration optimization yielded an efficient photocatalyst. At an optimum composition of Ti as x = 0.07 in $Sr_2Fe_{1-x}Ti_xNbO_6$, the photocatalyst exhibited 2 times the quantum yield for photolysis of $H_2O$ in presence of $CH_3OH$, than its undoped counterpart under visible light (${\lambda}{\geq}420nm$). Heavily Ti-doped $Sr_2Fe_{1-x}Ti_xNbO_6$ lattice exhibited poor photochemical properties due to the existence of constituent impurity phases as observed in the structural characterization, as well as deteriorated optical absorption. The higher electron-density acquired by n-type doping seem to be responsible for the more efficient charge separation in $Sr_2Fe_{1-x}Ti_xNbO_6$ (0.05 < x < 0.4) and thus consequently displays higher photocatalytic activity. The Ti incorporated structure also found to yield stable photocatalyst.

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