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Two‐Dimensional Perovskite Oxynitride K 2 LaTa 2 O 6 N with an H + /K + Exchangeability in Aqueous Solution Forming a Stable Photocatalyst for Visible‐Light H 2 Evolution
Author(s) -
Oshima Takayoshi,
Ichibha Tom,
Oqmhula Kenji,
Hibino Keisuke,
Mogi Hiroto,
Yamashita Shunsuke,
Fujii Kotaro,
Miseki Yugo,
Hongo Kenta,
Lu Daling,
Maezono Ryo,
Sayama Kazuhiro,
Yashima Masatomo,
Kimoto Koji,
Kato Hideki,
Kakihana Masato,
Kageyama Hiroshi,
Maeda Kazuhiko
Publication year - 2020
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.202002534
Subject(s) - aqueous solution , photocatalysis , visible spectrum , water splitting , materials science , protonation , perovskite (structure) , redox , oxygen evolution , catalysis , inorganic chemistry , photochemistry , crystallography , chemistry , electrochemistry , ion , biochemistry , optoelectronics , organic chemistry , electrode
Abstract Undoped layered oxynitrides have not been considered as promising H 2 ‐evolution photocatalysts because of the low chemical stability of oxynitrides in aqueous solution. Here, we demonstrate the synthesis of a new layered perovskite oxynitride, K 2 LaTa 2 O 6 N, as an exceptional example of a water‐tolerant photocatalyst for H 2 evolution under visible light. The material underwent in‐situ H + /K + exchange in aqueous solution while keeping its visible‐light‐absorption capability. Protonated K 2 LaTa 2 O 6 N, modified with an Ir cocatalyst, exhibited excellent catalytic activity toward H 2 evolution in the presence of I − as an electron donor and under visible light; the activity was six times higher than Pt/ZrO 2 /TaON, one of the best‐performing oxynitride photocatalysts for H 2 evolution. Overall water splitting was also achieved using the Ir‐loaded, protonated K 2 LaTa 2 O 6 N in combination with Cs‐modified Pt/WO 3 as an O 2 evolution photocatalyst in the presence of an I 3 − /I − shuttle redox couple.