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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 33, Number 10
BKCSDE 33(10)
October 20, 2012

Title	Improved Photolysis of Water from Ti Incorporated Double Perovskite Sr₂FeNbO₆ Lattice
Author	P. H. Borse, C. R. Cho, S. M. Yu, J. H. Yoon, T. E. Hong, J. S. Bae, E. D. Jeong, H. G. Kim*
Keywords	Photocatalysts, Sr₂FeNbO₆, Visible light, Photocatalytic activity, H₂ evolution
Abstract	The Ti incorporation at Fe-site in the double perovskite lattice of Sr2FeNbO6 (SFNO) system is studied. The Ti concentration optimization yielded an efficient photocatalyst. At an optimum composition of Ti as x = 0.07 in Sr2Fe1-xTixNbO6, the photocatalyst exhibited 2 times the quantum yield for photolysis of H2O in presence of CH3OH, than its undoped counterpart under visible light (λ ≥ 420 nm). Heavily Ti-doped Sr2Fe1-xTixNbO6 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 Sr2Fe1-xTixNbO6 (0.05 < x < 0.4) and thus consequently displays higher photocatalytic activity. The Ti incorporated structure also found to yield stable photocatalyst.
Page	3407 - 3412
Full Text	PDF

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