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Core–Shell‐Structured LaTaON 2 Transformed from LaKNaTaO 5 Plates for Enhanced Photocatalytic H 2 Evolution
Author(s) -
Wang Xin,
Hisatomi Takashi,
Wang Zheng,
Song Jun,
Qu Junle,
Takata Tsuyoshi,
Domen Kazunari
Publication year - 2019
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.201906081
Subject(s) - photocatalysis , materials science , oxide , catalysis , visible spectrum , lattice (music) , complex oxide , nitriding , chemical engineering , optoelectronics , nanotechnology , chemistry , metallurgy , layer (electronics) , biochemistry , physics , acoustics , engineering
LaTaON 2 is a photocatalyst with intense visible light absorption up to 650 nm, but exhibits low H 2 evolution activity owing to uncontrolled facets and high defect densities. In this work, core–shell‐structured plate‐like LaKNaTaO 5 /LaTaON 2 was synthesized by nitriding a layered perovskite‐type LaKNaTaO 5 . The volatilization of K and Na species during the nitridation promoted the rapid transformation of LaKNaTaO 5 into LaTaON 2 along [010] direction with the plate‐like shape retained. This yielded high‐quality LaTaON 2 shells exposing (010) facets on the lattice‐matched LaKNaTaO 5 cores. After loading with a Rh co‐catalyst, LaKNaTaO 5 /LaTaON 2 showed photocatalytic H 2 evolution activity four times greater than that obtained from conventional irregular‐shaped LaTaON 2 powders and utilized visible light up to 620 nm. This work provides a novel strategy yielding oxynitrides with well‐defined facets and low defect densities by selecting lattice‐matched oxide precursors containing volatile components.