Photocatalytic activity of metal-decorated SiO2@TiO2 hybrid photocatalysts under water splitting

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We report the fabrication of a metal-decorated hybrid nanocomposite with TiO2 encapsulation (Metal/SiO2@TiO2, Metal=Pt or Ru) using a simple surface-modification chemical process. Metal nanoparticles capped with polyvinylpyrrolidone were successfully assembled on functionalized SiO2 via electrostatic interactions, after which a thin layer of TiO2 was coated on the surface by the sol-gel process to avoid agglomeration of the coated silica spheres. Transmission electron microscopy studies confirmed that the metal nanoparticles were uniformly distributed throughout the surface of the SiO2 with a thin layer of TiO2. In addition, X-ray diffraction was employed to ensure the crystal structure of the uniformly coated thin TiO2 layer. Even after calcination at 500 A degrees C, the structure remained intact, confirming high thermal stability. The photocatalytic activity of the metal-decorated SiO2/TiO2 nanocomposites was evaluated using the H-2 evolution reaction. The Metal/SiO2@TiO2 catalysts show the photocatalytic water splitting efficiency for H-2 generation (i.e., 0.14% for Pt/SiO2@TiO2 and 0.12% for Ru/SiO2@TiO2), while there is no generation of H-2 on the Metal/SiO2 without a coating layer. These results indicate that the anatase crystalline coating layer has good thermal and chemical stability and plays a significant role in photocatalytic H-2 production
Publisher
KOREAN INSTITUTE CHEMICAL ENGINEERS
Issue Date
2016-08
Language
English
Article Type
Article
Keywords

VISIBLE-LIGHT IRRADIATION; HYDROGEN-PRODUCTION; CATALYTIC-ACTIVITY; NANOPARTICLES; TITANIA; SILICA; NANOCATALYSTS; SPHERES; PHOTODEGRADATION; GENERATION

Citation

KOREAN JOURNAL OF CHEMICAL ENGINEERING, v.33, no.8, pp.2325 - 2329

ISSN
0256-1115
DOI
10.1007/s11814-016-0085-7
URI
http://hdl.handle.net/10203/213570
Appears in Collection
EEW-Journal Papers(저널논문)
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