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Switching on the Photocatalysis of Metal–Organic Frameworks by Engineering Structural Defects
Author(s) -
Ma Xing,
Wang Li,
Zhang Qun,
Jiang HaiLong
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201907074
Subject(s) - photocatalysis , metal organic framework , materials science , relaxation (psychology) , ultrafast laser spectroscopy , absorption (acoustics) , chemical engineering , linker , photochemistry , chemistry , catalysis , nanotechnology , spectroscopy , organic chemistry , composite material , adsorption , psychology , social psychology , physics , quantum mechanics , computer science , engineering , operating system
Defect engineering is a versatile approach to modulate band and electronic structures as well as materials performance. Herein, metal–organic frameworks (MOFs) featuring controlled structural defects, namely UiO‐66‐NH 2 ‐X (X represents the molar equivalents of the modulator, acetic acid, with respect to the linker in synthesis), were synthesized to systematically investigate the effect of structural defects on photocatalytic properties. Remarkably, structural defects in MOFs are able to switch on the photocatalysis. The photocatalytic H 2 production rate presents a volcano‐type trend with increasing structural defects, where Pt@UiO‐66‐NH 2 ‐100 exhibits the highest activity. Ultrafast transient absorption spectroscopy unveils that UiO‐66‐NH 2 ‐100 with moderate structural defects possesses the fastest relaxation kinetics and the highest charge separation efficiency, while excessive defects retard the relaxation and reduce charge separation efficiency.