Synthesis of (H3O)TiNbO5·0.26H2O via hydronium (H3O+) ion-exchange reaction and its photocatalytic activity for H2 evolution from aqueous methanol solution

H. Takahashi, M. Kakihana, Y. Yamashita, K. Yoshida, S. Ikeda, M. Hara, K. Domen

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(H3O)TiNbO5·0.26H2O powder was prepared from layered titanoniobate, KTiNbO5, using an ion-exchange reaction in acidic aqueous solution. X-ray diffraction, thermogravimetry-differential thermal analysis, energy-dispersive X-ray analysis and infrared spectral data gave the first experimental evidence that the so-called proton-exchanged form HTiNbO5 involves hydrated water or hydrated hydronium ion. The intercalation of water or hydronium ion in KTiNbO5 was not achieved by the conventional high-temperature solid-state reaction method but by the low-temperature polymerizable complex (PC) method. While KTiNbO5 via the PC route, combined with Pt, showed only little improvement of the photocatalytic activity with respect to H2 evolution from aqueous methanol solution, the water or hydronium ion intercalated species, (H3O)TiNbO5·0.26H2O, with Pt loading, showed much higher activities than the others species studied by an order of magnitude.

Original languageEnglish
Pages (from-to)4461-4464
Number of pages4
JournalPhysical Chemistry Chemical Physics
Issue number19
Publication statusPublished - 2000 Oct 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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