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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 

Improved Photolysis of Water from Ti Incorporated Double Perovskite Sr2FeNbO6 Lattice
P. H. Borse, C. R. Cho, S. M. Yu, J. H. Yoon, T. E. Hong, J. S. Bae, E. D. Jeong, H. G. Kim*
Photocatalysts, Sr2FeNbO6, Visible light, Photocatalytic activity, H2 evolution
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.
3407 - 3412
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