Improved Photolysis of Water from Ti Incorporated Double Perovskite Sr2FeNbO6 Lattice

Bulletin of the Korean chemical society

C. R. Cho¹  J. S. Bae¹  P. H. Borse¹  J. H. Yoon¹  S. M. Yu¹  H. G. Kim¹  T. E. Hong¹  E. D. Jeong¹ 

关键词: Photocatalysts;    Sr2FeNbO6;    Visible light;    Photocatalytic activity;    H2 evolution;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

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.

【 授权许可】

Unknown