Platinum Nanoparticle Co-Catalyst-Induced Improved Photoelectrical Properties in a Chromium-Doped SrTiO3
J. Korean Phy. Soc. 2009; 55: 2470~2475
Published online December 15, 2009 © 2009 The Korean Physical Society.

Abstract
SrTi$_{1-x}$Cr$_{x}$O$_{3}$ (0 $leq$ $x$ $leq$ 0.5) photocatalystswere prepared by using conventional solid state reactions at 1300 $^{circ}$C for 5 h and were characterized by using ultraviolet-visible(UV-vis) absorption spectroscopy. SrTi$_{1-x}$Cr$_{x}$O$_{3}$samples not only absorb UV light photons, but also visible lightphotons due to substitutional doping of chromium at titanium sitesin the SrTiO$_{3}$ lattice. Apparently, the band transition from theCr 3d to the Cr 3d + Ti-3d hybrid orbital induces visible lightabsorptivity in SrTi$_{1-x}$Cr$_{x}$O$_{3}$ samples. Thephotocatalytic activity of Cr-doped SrTiO$_{3}$ samples for hydrogenproduction from water-methanol mixtures under UV light irradiationdecreased with increased Cr doping concentration in SrTiO$_{3}$.Conclusively, there exists an optimum chromium and platinumconcentration in SrTiO$_{3}$ for achieving high photocatalyticactivity under visible light ($lambda$ $geq$ 420 nm)
Keywords: Cr-doped SrTiO$_{3}$, Solid state reaction, Photocatalysis, Hydrogen production


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