NDLI: Structural, optical and visible-light photocatalytic properties of Sr$_{3}$FeNb$_{2}$O$

Content Provider	Springer Nature Link
Author	Kim, H. G. Lim, K. T. Bae, J. S. Borse, P. H. Hong, T. E. Chung, E. H. Yoon, J H. Jeong, E. D. Cha, Y. J.
Copyright Year	2014
Abstract	A simple solid-state route has been utilized to prepare Sr$_{3}$FeNb$_{2}$O$_{9}$ particles with the tetragonal (SG P4/mmm), double-perovskite structure. The structural investigation and a calcination temperature optimization in the range of 700–1300 °C revealed that a pure phase Sr$_{3}$FeNb$_{2}$O$_{9}$ could be achieved at a temperature of 1200 °C. The crystallites with the sizes in the range of ~5–10 μm, exhibited a bandgap of 2.25 eV as deduced from diffuse reflectance studies. The structural and the optical properties demonstrated its suitability for visible-light active photocatalyst applications. The electrochemical characterization indicated a comparatively negative flat-band potential value for Sr$_{3}$FeNb$_{2}$O$_{9}$ particles with respect to the reduction potential of water, indicating its capability to reduce water molecule. A very low Pt loading (< 0.2 wt%) over Sr$_{3}$FeNb$_{2}$O$_{9}$ yielded a high photocatalytic hydrogen evolution efficiency under visible light (λ ≥ 420 nm). Its photoreduction activity for water was found to be 1.4 times higher than that of the reference Sr$_{2}$FeNbO$_{6}$ photocatalyst prepared separately. The overall physico-chemical analysis in this study revealed that the suitable band-edge position of Sr$_{3}$FeNb$_{2}$O$_{9}$ could be attributed to its superior performance as compared to Sr$_{2}$FeNbO$_{6}$. A mechanism is proposed to explain the photocatalytic behavior of the Sr$_{3}$FeNb$_{2}$O$_{9}$ photocatalyst.
Starting Page	520
Ending Page	525
Page Count	6
File Format	PDF
ISSN	03744884
Journal	Journal of the Korean Physical Society
Volume Number	65
Issue Number	4
e-ISSN	19768524
Language	English
Publisher	The Korean Physical Society
Publisher Date	2014-09-13
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Photocatalytic activity H$_{2}$ Catalytic methods Sr$_{3}$FeNb$_{2}$O$_{9}$ Theoretical, Mathematical and Computational Physics Visible light New materials: theory, design, and fabrication Photocatalysts Physics Particle and Nuclear Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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