Premium
Size Control of LaNbON 2 Particles for Enhanced Photocatalytic Water Oxidation Under Visible Light Irradiation
Author(s) -
Seo Jeongsuk
Publication year - 2021
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.12224
Subject(s) - visible spectrum , photocatalysis , irradiation , materials science , photochemistry , absorption (acoustics) , scheelite , redox , nitride , chemistry , catalysis , nanotechnology , optoelectronics , layer (electronics) , tungsten , biochemistry , physics , nuclear physics , composite material , metallurgy
Perovskite‐type LaNbON 2 has the longest wavelength onset of visible light absorption—up to approximately 740 nm—among (oxy)nitrides based on transition metals Ti, Ta, and Nb. Water oxidation using visible‐light‐responsive LaNbON 2 is challenging because the synthesis of the oxynitride has rarely been studied. Herein, we report the synthesis of small LaNbON 2 particles and their size effect on photocatalytic water oxidation under visible light illumination. The small scheelite‐type LaNbO 4 , prepared by a polymerized complex method, was transformed into less‐defective LaNbON 2 during nitridation as compared with that nitrided from LaNbO 4 via a solid‐state reaction method. The small LaNbON 2 particles, capable of absorbing intense visible light 700 nm above, improved the O 2 evolution during 5 h of water oxidation under 300 W Xe light irradiation (λ > 420 nm). This enhancement was attributed to the size reduction of LaNbON 2 particles, leading to increased surface area and encouragement of mild nitridation.