Issue 28, 2015

Facile water-based preparation of Rh-doped SrTiO3 nanoparticles for efficient photocatalytic H2 evolution under visible light irradiation

Abstract

Fine particles of Rh doped SrTiO3 (SrTiO3:Rh) were prepared via a newly developed facile water-based process; stable aqueous precursor solutions were prepared by simple mixing of stable aqueous titania sol with Sr and Rh salts in the presence of an acrylic emulsion, then dried and finally calcined in air at 900–1050 °C. The SrTiO3:Rh particles prepared at 1000 °C were smaller than 50 nm in diameter and exhibited much higher efficiency for H2 evolution from methanol aqueous solution under visible light (e.g. 13.2% of quantum yield at 420 nm) than those prepared by conventional solid state reaction (∼5%). On the other hand, the SrTiO3:Rh particles prepared from the aqueous titania sol without the acrylic emulsion or from other aqueous titania precursors with the acrylic emulsion were found to have an increased particle size up to 100 nm, and exhibited lower photocatalytic activity, indicating that the combination of the aqueous titania sol and the acrylic emulsion effectively suppresses the particle growth, and consequently yields SrTiO3:Rh particles having a small particle size and high crystallinity, both of which are necessary to achieve highly efficient photocatalysis.

Graphical abstract: Facile water-based preparation of Rh-doped SrTiO3 nanoparticles for efficient photocatalytic H2 evolution under visible light irradiation

Supplementary files

Article information

Article type
Paper
Submitted
21 Apr 2015
Accepted
06 Jun 2015
First published
11 Jun 2015

J. Mater. Chem. A, 2015,3, 14794-14800

Facile water-based preparation of Rh-doped SrTiO3 nanoparticles for efficient photocatalytic H2 evolution under visible light irradiation

S. Okunaka, H. Tokudome and R. Abe, J. Mater. Chem. A, 2015, 3, 14794 DOI: 10.1039/C5TA02903A

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