Undoped Layered Perovskite Oxynitride Li 2 LaTa 2 O 6 N for Photocatalytic CO 2 Reduction with Visible Light
Abstract 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 li...
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Published in | Angewandte Chemie Vol. 130; no. 27; pp. 8286 - 8290 |
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Main Authors | , , , , , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
02.07.2018
|
Online Access | Get full text |
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Summary: | Abstract
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. |
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ISSN: | 0044-8249 1521-3757 |
DOI: | 10.1002/ange.201803931 |