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 language | English |
|---|---|
| Pages (from-to) | 15773-15782 |
| Number of pages | 10 |
| Journal | Journal of the American Chemical Society |
| Volume | 134 |
| Issue number | 38 |
| DOIs | |
| Publication status | Published - Sep 26 2012 |
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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 journal › Article
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TY - JOUR
T1 - Preparation of tantalum-based oxynitride nanosheets by exfoliation of a layered oxynitride, CsCa 2Ta 3O 10-xN y, and their photocatalytic activity
AU - Ida, Shintaro
AU - Okamoto, Yohei
AU - Matsuka, Maki
AU - Hagiwara, Hidehisa
AU - Ishihara, Tatsumi
PY - 2012/9/26
Y1 - 2012/9/26
N2 - 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.
AB - 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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U2 - 10.1021/ja3043678
DO - 10.1021/ja3043678
M3 - Article
AN - SCOPUS:84866706245
VL - 134
SP - 15773
EP - 15782
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 38
ER -