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

Research output: Contribution to journalArticle

96 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

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Tantalum
Nanosheets
Protons
Water
Light
Ultraviolet Rays
Irradiation
Methanol
Hydrogen
Ions
Calcium
Catalysts
Intercalation
Ultraviolet radiation
Perovskite
Monolayers
Ion exchange
Decomposition

All Science Journal Classification (ASJC) codes

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

Cite this

Preparation of tantalum-based oxynitride nanosheets by exfoliation of a layered oxynitride, CsCa 2Ta 3O 10-xN y, and their photocatalytic activity. / Ida, Shintaro; Okamoto, Yohei; Matsuka, Maki; Hagiwara, Hidehisa; Ishihara, Tatsumi.

In: Journal of the American Chemical Society, Vol. 134, No. 38, 26.09.2012, p. 15773-15782.

Research output: Contribution to journalArticle

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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.",
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