Fabrication of SrTiO3 exposing characteristic facets using molten salt flux and improvement of photocatalytic activity for water splitting

Hideki Kato, Makoto Kobayashi, Michikazu Hara, Masato Kakihana

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

Abstract

Flux treatment using various molten salts was performed for SrTiO 3 powders. Morphology of SrTiO3 crystals obtained by the flux treatment strongly depended on the kinds of molten salts used. Large cubic crystals exposing {100} facets with a size of 5-6 μm were obtained by the flux treatment with LiCl whereas truncated cubes exposing {100} and {110} facets with a size of 200-400 nm were obtained when NaCl or SrCl2 was used as a flux reagent. In contrast, the flux treatment with KCl gave characteristic shaped crystals with a size of 300 nm. Electron microscope observation and electron diffraction analysis revealed that the crystals treated with the KCl flux expose {100}, {120}, and {121} facets. SrTiO3 treated with the KCl flux exhibited higher activity by 20 times than the non-flux-treated sample. Thus, a remarkable improvement of activity has been achieved by the fabrication of SrTiO3 crystals exposing high-index facets, {120} and {121}, using the KCl flux.

Original languageEnglish
Pages (from-to)1733-1738
Number of pages6
JournalCatalysis Science and Technology
Volume3
Issue number7
DOIs
Publication statusPublished - 2013 Jul 1

ASJC Scopus subject areas

  • Catalysis

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