Improved performance of tri-doped photocatalyst SrTiO3:Rh/Ta/F for H-2 evolution under visible light irradiation

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A photocatalyst for visible light irradiation was prepared by simultaneously doping SrTiO3 with F- anion and Rh3+ and Ta5+ cations for the first time through a spray pyrolysis process. The ternary doping of F- contributed to the reduction of Ti4+ and Rh4+ to Ti3+ and Rh3+, respectively, by generating extra electron in the lattice. The partially substituted structure of the photocatalyst could be expressed as Sr(Ti1-2x-z4+Tiz3+Rhx-y3+Rhy4+Tax5+) (O3-w2-F- w). The doping of F- into SrTiO3:Rh/Ta increased the photocatalytic hydrogen evolution rate to 4123.7 mu molg(-1)h(-1) (quantum efficiency: 6.60%) under visible light irradiation, which was 1.93 times higher than that of SrTiO3:Rh/Ta. The optimum composition of dopants for maximum hydrogen evolution rate was Rh (0.15 mol%), Ta (0.15 mol%), and F (6.0 mol%). (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2016-08
Language
English
Article Type
Article
Keywords

AQUEOUS-METHANOL SOLUTION; SPRAY-PYROLYSIS; SRTIO3 PHOTOCATALYSTS; TIO2 POWDERS; MECHANOCHEMICAL SYNTHESIS; DRIVEN PHOTOCATALYST; ELECTRONIC-STRUCTURE; POLYMERIC PRECURSOR; HYDROGEN-PRODUCTION; WATER

Citation

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.41, no.32, pp.13970 - 13978

ISSN
0360-3199
DOI
10.1016/j.ijhydene.2016.06.213
URI
http://hdl.handle.net/10203/213243
Appears in Collection
CBE-Journal Papers(저널논문)
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