Preparation of tantalum-based oxynitride nanosheets by exfoliation of a layered oxynitride, CsCa 2Ta 3O 10-xN y, and their photocatalytic activity

Shintaro Ida, Yohei Okamoto, Maki Matsuka, Hidehisa Hagiwara, Tatsumi Ishihara

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    115 Citations (Scopus)

    Abstract

    Calcium tantalum oxynitride [Ca 2Ta 3O 9.7N 0.2] - nanosheets were prepared by exfoliating a layered perovskite oxynitride (CsCa 2Ta 3O 9.7N 0.2) via proton exchange and two-step intercalation of ethylamine and tetrabutylammonium ions. Monolayer nanosheet was prepared by the above processes, although some bilayer or trilayer nanosheets were also produced. The [Ca 2Ta 3O 9.7N 0.2] - nanosheets exhibited photocatalytic activity for H 2 evolution from water under visible light irradiation. In contrast, CsCa 2Ta 3O 9.7N 0.2 exhibited very low photocatalytic activity for H 2 evolution under the visible light irradiation, even when methanol was added to water as a sacrificial agent. The improved photocatalytic activity originates from the characteristics of nanosheets such as their molecular thickness and large surface area. Further, the Rh-loaded [Ca 2Ta 3O 9.7N 0.2] - nanosheets restacked with protons exhibited photocatalytic activity for H 2 and O 2 evolution from pure water under UV-light irradiation. The ratio of H 2/O 2 evolved was around 3. The ratio of N/O in the catalyst remained the same after the photocatalytic reaction, signifying that there was no decomposition of the catalyst during the reaction. This indicates that the present N-doped nanosheet is stable in the photocatalytic reaction.

    Original languageEnglish
    Pages (from-to)15773-15782
    Number of pages10
    JournalJournal of the American Chemical Society
    Volume134
    Issue number38
    DOIs
    Publication statusPublished - Sep 26 2012

    All Science Journal Classification (ASJC) codes

    • Catalysis
    • Chemistry(all)
    • Biochemistry
    • Colloid and Surface Chemistry

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