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Undoped Layered Perovskite Oxynitride Li 2 LaTa 2 O 6 N for Photocatalytic CO 2 Reduction with Visible Light
Author(s) -
Oshima Takayoshi,
Ichibha Tom,
Qin Ken Sinkou,
Muraoka Kanemichi,
Vequizo Junie Jhon M.,
Hibino Keisuke,
Kuriki Ryo,
Yamashita Shunsuke,
Hongo Kenta,
Uchiyama Tomoki,
Fujii Kotaro,
Lu Daling,
Maezono Ryo,
Yamakata Akira,
Kato Hideki,
Kimoto Koji,
Yashima Masatomo,
Uchimoto Yoshiharu,
Kakihana Masato,
Ishitani Osamu,
Kageyama Hiroshi,
Maeda Kazuhiko
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201803931
Subject(s) - materials science , perovskite (structure) , visible spectrum , photocatalysis , crystallinity , band gap , photoluminescence , oxide , photochemistry , crystallography , chemistry , optoelectronics , catalysis , biochemistry , metallurgy , composite material
Oxynitrides are promising visible‐light‐responsive photocatalysts, but their structures are almost confined with three‐dimensional (3D) structures such as perovskites. A phase‐pure Li 2 LaTa 2 O 6 N with a layered perovskite structure was successfully prepared by thermal ammonolysis of a lithium‐rich oxide precursor. Li 2 LaTa 2 O 6 N exhibited high crystallinity and visible‐light absorption up to 500 nm. As opposed to well‐known 3D oxynitride perovskites, Li 2 LaTa 2 O 6 N supported by a binuclear Ru II complex was capable of stably and selectively converting CO 2 into formate under visible light ( λ >400 nm). Transient absorption spectroscopy indicated that, as compared to 3D oxynitrides, Li 2 LaTa 2 O 6 N possesses a lower density of mid‐gap states that work as recombination centers of photogenerated electron/hole pairs, but a higher density of reactive electrons, which is responsible for the higher photocatalytic performance of this layered oxynitride.