Synthesis of Three-Layer Perovskite Oxynitride K2 Ca2 Ta3 O9 N·2H2 O and Photocatalytic Activity for H2 Evolution under Visible Light

Inorganic Chemistry
Ya TangKazuhiko Maeda

Abstract

Substitution of oxide anions (O2-) in a metal oxide for nitrogen (N3-) results in reduction of the band gap, which is attractive in heterogeneous photocatalysis; however, only a handful of two-dimensional layered perovskite oxynitrides have been reported, and thus, the structural effects of layered oxynitrides on photocatalytic activity have not been sufficiently examined. This study reports the synthesis of a Ruddlesden-Popper phase three-layer oxynitride perovskite of K2Ca2Ta3O9N·2H2O, and the photocatalytic activity is compared with an analogous two-layer perovskite, K2LaTa2O6N·1.6H2O. Topochemical ammonolysis reaction of a Dion-Jacobson phase oxide KCa2Ta3O10 at 1173 K in the presence of K2CO3 resulted in a single-phase layered perovskite, K2Ca2Ta3O9N·2H2O, which belongs to the tetragonal P4/mmm space group, as demonstrated by synchrotron X-ray diffraction, scanning transmission electron microscopy measurements, and elemental analysis. The synthesized K2Ca2Ta3O9N·2H2O has an absorption edge at around 460 nm, with an estimated band gap of ca. 2.7 eV. K2Ca2Ta3O9N·2H2O modified with a Pt cocatalyst generated H2 from an aqueous solution containing a dissolved NaI as a reversible electron donor under visible light (λ > 400 nm) w...Continue Reading

References

Dec 18, 2008·Chemical Society Reviews·Akihiko Kudo, Yugo Miseki
May 26, 2015·Science and Technology of Advanced Materials·Tsuyoshi TakataKazunari Domen
Feb 25, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Takayoshi OshimaKazuhiko Maeda
Feb 24, 2018·Nature Communications·Hiroshi KageyamaKenneth R Poeppelmeier
Aug 19, 2018·Scientific Reports·Shunsuke YamashitaKoji Kimoto

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