Effect of TiCl4 treatment on the photoelectrochemical properties of LaTiO2N electrodes for water splitting under visible light

Naoyuki Nishimura, Biet Raphael, Kazuhiko Maeda, Laurent Le Gendre, Ryu Abe, Jun Kubota, Kazunari Domen

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Abstract

A lanthanum titanium oxynitride (LaTiO2N) electrode was studied as a visible-light driven photoelectrode for water splitting. The electrode was prepared by casting a LaTiO2N powder on a fluorine-doped tin oxide glass substrate, followed by calcination under dinitrogen. The as-prepared electrode exhibited an anodic photocurrent based on water oxidation under visible-light irradiation (λ > 420 nm) in an electrolyte (Na 2SO4) solution. This current was increased by post-treatment with titanium(IV) chloride (TiCl4) solution. Scanning electron microscopy and X-ray photoelectron spectroscopy revealed that the titanium species introduced by the post-treatment were titanium oxide, and that they were embedded within LaTiO2N particles. Resistance measurements of LaTiO2N electrodes suggested that the increase in the electrode photocurrent after TiCl4 treatment was due to the improvement of inter-particle electron transfer in the LaTiO2N thin film.

Original languageEnglish
Pages (from-to)5855-5859
Number of pages5
JournalThin Solid Films
Volume518
Issue number20
DOIs
Publication statusPublished - 2 Aug 2010
Externally publishedYes

Keywords

  • Calcination
  • Lanthanum titanium oxynitride
  • Oxynitride
  • Photocurrent
  • Photoelectrode
  • Powders
  • Scanning electron microscopy
  • Titanium chloride
  • Water splitting

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